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options.txt  	For Vim version 9.1.  Last change: 2024 Jan 30


		  VIM REFERENCE MANUAL	  by Bram Moolenaar


Options							options

1. Setting options			set-option
2. Automatically setting options	auto-setting
3. Options summary			option-summary

For an overview of options see quickref.txt option-list.

Vim has a number of internal variables and switches which can be set to
achieve special effects.  These options come in three forms:
	boolean		can only be on or off		boolean toggle
	number		has a numeric value
	string		has a string value

==============================================================================
1. Setting options					set-option E764

							:se :set
:se[t][!]		Show all options that differ from their default value.
			When [!] is present every option is on a separate
			line.

:se[t][!] all		Show all but terminal options.
			When [!] is present every option is on a separate
			line.

:se[t] termcap		Show all terminal options.  Note that in the GUI the
			key codes are not shown, because they are generated
			internally and can't be changed.  Changing the terminal
			codes in the GUI is not useful either...
			The options have the form t_AB, see
			terminal-options.

:se[t]! termcap		Idem, but don't use multiple columns.

								E518 E519
:se[t] {option}?	Show value of {option}.

:se[t] {option}		Toggle option: set, switch it on.
			Number option: show value.
			String option: show value.

:se[t] no{option}	Toggle option: Reset, switch it off.

							   :set-! :set-inv
:se[t] {option}!   or
:se[t] inv{option}	Toggle option: Invert value.

				:set-default :set-& :set-&vi :set-&vim
:se[t] {option}&	Reset option to its default value.  May depend on the
			current value of 'compatible'.
:se[t] {option}&vi	Reset option to its Vi default value.
:se[t] {option}&vim	Reset option to its Vim default value.

:se[t] all&		Set all options to their default value.  The values of
			these options are not changed:
			  all terminal options, starting with t_
			  'columns'
			  'cryptmethod'
			  'encoding'
			  'key'
			  'lines'
			  'term'
			  'ttymouse'
			  'ttytype'
			Warning: This may have a lot of side effects.

					    :set-args :set= E487 E521
:se[t] {option}={value}		or
:se[t] {option}:{value}
			Set string or number option to {value}.
			For numeric options the value can be given in decimal,
			hex (preceded with 0x) or octal (preceded with '0').
			The old value can be inserted by typing 'wildchar' (by
			default this is a <Tab> or CTRL-E if 'compatible' is
			set). Many string options with fixed syntax and names
			also support completing known values.  See
			cmdline-completion and complete-set-option.
			White space between {option} and '=' is allowed and
			will be ignored.  White space between '=' and {value}
			is not allowed.
			See option-backslash for using white space and
			backslashes in {value}.

:se[t] {option}+={value}				:set+=
			Add the {value} to a number option, or append the
			{value} to a string option.  When the option is a
			comma-separated list, a comma is added, unless the
			value was empty.
			If the option is a list of flags, superfluous flags
			are removed.  When adding a flag that was already
			present the option value doesn't change.
			Also see :set-args above.

:se[t] {option}^={value}				:set^=
			Multiply the {value} to a number option, or prepend
			the {value} to a string option.  When the option is a
			comma-separated list, a comma is added, unless the
			value was empty.
			Also see :set-args above.

:se[t] {option}-={value}				:set-=
			Subtract the {value} from a number option, or remove
			the {value} from a string option, if it is there.
			If the {value} is not found in a string option, there
			is no error or warning.  When the option is a comma
			separated list, a comma is deleted, unless the option
			becomes empty.
			When the option is a list of flags, {value} must be
			exactly as they appear in the option.  Remove flags
			one by one to avoid problems.
			The individual values from a comma separated list or
			list of flags can be inserted by typing 'wildchar'.
			See complete-set-option.
			Also see :set-args above.

The {option} arguments to ":set" may be repeated.  For example: 
	:set ai nosi sw=3 ts=3
If you make an error in one of the arguments, an error message will be given
and the following arguments will be ignored.

							:set-verbose
When 'verbose' is non-zero, displaying an option value will also tell where it
was last set.  Example: 
	:verbose set shiftwidth cindent?
  shiftwidth=4 
	  Last set from modeline line 1 
  cindent 
	  Last set from /usr/local/share/vim/vim60/ftplugin/c.vim line 30 
This is only done when specific option values are requested, not for ":verbose
set all" or ":verbose set" without an argument.
When the option was set by hand there is no "Last set" message.
When the option was set while executing a function, user command or
autocommand, the script in which it was defined is reported.
Note that an option may also have been set as a side effect of setting
'compatible'.
A few special texts:
	Last set from modeline line 1 
		Option was set in a modeline.
	Last set from --cmd argument 
		Option was set with command line argument --cmd or +.
	Last set from -c argument 
		Option was set with command line argument -c, +, -S or
		-q.
	Last set from environment variable 
		Option was set from an environment variable, $VIMINIT,
		$GVIMINIT or $EXINIT.
	Last set from error handler 
		Option was cleared when evaluating it resulted in an error.

{not available when compiled without the |+eval| feature}

							:set-termcap E522
For {option} the form "t_xx" may be used to set a terminal option.  This will
override the value from the termcap.  You can then use it in a mapping.  If
the "xx" part contains special characters, use the <t_xx> form: 
	:set <t_#4>=^[Ot
This can also be used to translate a special code for a normal key.  For
example, if Alt-b produces <Esc>b, use this: 
	:set <M-b>=^[b
(the ^[ is a real <Esc> here, use CTRL-V <Esc> to enter it)
The advantage over a mapping is that it works in all situations.

You can define any key codes, e.g.: 
	:set t_xy=^[foo;
There is no warning for using a name that isn't recognized.  You can map these
codes as you like: 
	:map <t_xy> something
								E846
When a key code is not set, it's like it does not exist.  Trying to get its
value will result in an error: 
	:set t_kb=
	:set t_kb
	E846: Key code not set: t_kb 

The t_xx options cannot be set from a modeline or in the sandbox, for
security reasons.

The listing from ":set" looks different from Vi.  Long string options are put
at the end of the list.  The number of options is quite large.  The output of
"set all" probably does not fit on the screen, causing Vim to give the
more-prompt.

							option-backslash
To include white space in a string option value it has to be preceded with a
backslash.  To include a backslash you have to use two.  Effectively this
means that the number of backslashes in an option value is halved (rounded
down).
In options 'path', 'cdpath', and 'tags', spaces have to be preceded with three
backslashes instead for compatibility with version 3.0 where the options can
be separated by either commas or spaces.
Comma-separated options like 'backupdir' and 'tags' will also require commas
to be escaped with two backslashes, whereas this is not needed for
non-comma-separated ones like 'makeprg'.
When setting options using :let and literal-string, you need to use one
fewer layer of backslash.
A few examples: 
   :set makeprg=make\ file	    results in "make file"
   :let &makeprg='make file'	    (same as above)
   :set makeprg=make\\\ file	    results in "make\ file"
   :set tags=tags\ /usr/tags	    results in "tags" and "/usr/tags"
   :set tags=tags\\\ file	    results in "tags file"
   :let &tags='tags\ file'	    (same as above)

   :set makeprg=make,file	    results in "make,file"
   :set makeprg=make\\,file	    results in "make\,file"
   :set tags=tags,file		    results in "tags" and "file"
   :set tags=tags\\,file	    results in "tags,file"
   :let &tags='tags\,file'	    (same as above)

The "|" character separates a ":set" command from a following command.  To
include the "|" in the option value, use "\|" instead.  This example sets the
'titlestring' option to "hi|there": 
   :set titlestring=hi\|there
This sets the 'titlestring' option to "hi" and 'iconstring' to "there": 
   :set titlestring=hi|set iconstring=there

Similarly, in legacy script the double quote character starts a comment.  To
include the '"' in the option value, use '\"' instead.  This example sets the
'titlestring' option to 'hi "there"': 
   :set titlestring=hi\ \"there\"

In Vim9 script it's simpler, comments start with a '#' character, and only
when preceded by white space.  A backslash is needed less often: 
   vim9script
   set titlestring=hi\ "there"
   set titlestring=hi#there#
   set titlestring=hi\ \#there#

For Win32 backslashes in file names are mostly not removed.  More precise: For
options that expect a file name (those where environment variables are
expanded) a backslash before a normal file name character is not removed.  But
a backslash before a special character (space, backslash, comma, etc.) is used
like explained above.
There is one special situation, when the value starts with "\\": 
   :set dir=\\machine\path	    results in "\\machine\path"
   :set dir=\\\\machine\\path	    results in "\\machine\path"
   :set dir=\\path\\file	    results in "\\path\file" (wrong!)
For the first one the start is kept, but for the second one the backslashes
are halved.  This makes sure it works both when you expect backslashes to be
halved and when you expect the backslashes to be kept.  The third gives a
result which is probably not what you want.  Avoid it.

				add-option-flags remove-option-flags
				E539 E550 E551 E552
Some options are a list of flags.  When you want to add a flag to such an
option, without changing the existing ones, you can do it like this: 
   :set guioptions+=a
Remove a flag from an option like this: 
   :set guioptions-=a
This removes the 'a' flag from 'guioptions'.
Note that you should add or remove one flag at a time.  If 'guioptions' has
the value "ab", using "set guioptions-=ba" won't work, because the string "ba"
doesn't appear.

			   :set_env expand-env expand-environment-var
Environment variables in specific string options will be expanded.  If the
environment variable exists the '$' and the following environment variable
name is replaced with its value.  If it does not exist the '$' and the name
are not modified.  Any non-id character (not a letter, digit or '_') may
follow the environment variable name.  That character and what follows is
appended to the value of the environment variable.  Examples: 
   :set term=$TERM.new
   :set path=/usr/$INCLUDE,$HOME/include,.
When adding or removing a string from an option with ":set opt-=val" or ":set
opt+=val" the expansion is done before the adding or removing.


Handling of local options			local-options

Note: The following also applies to global-local options.

Some of the options only apply to a window or buffer.  Each window or buffer
has its own copy of this option, thus each can have its own value.  This
allows you to set 'list' in one window but not in another.  And set
'shiftwidth' to 3 in one buffer and 4 in another.

The following explains what happens to these local options in specific
situations.  You don't really need to know all of this, since Vim mostly uses
the option values you would expect.  Unfortunately, doing what the user
expects is a bit complicated...

When splitting a window, the local options are copied to the new window.  Thus
right after the split the contents of the two windows look the same.

When editing a new buffer, its local option values must be initialized.  Since
the local options of the current buffer might be specifically for that buffer,
these are not used.  Instead, for each buffer-local option there also is a
global value, which is used for new buffers.  With ":set" both the local and
global value is changed.  With "setlocal" only the local value is changed,
thus this value is not used when editing a new buffer.

When editing a buffer that has been edited before, the options from the window
that was last closed are used again.  If this buffer has been edited in this
window, the values from back then are used.  Otherwise the values from the
last closed window where the buffer was edited last are used.

It's possible to set a local window option specifically for a type of buffer.
When you edit another buffer in the same window, you don't want to keep
using these local window options.  Therefore Vim keeps a global value of the
local window options, which is used when editing another buffer.  Each window
has its own copy of these values.  Thus these are local to the window, but
global to all buffers in the window.  With this you can do: 
	:e one
	:set list
	:e two
Now the 'list' option will also be set in "two", since with the ":set list"
command you have also set the global value. 
	:set nolist
	:e one
	:setlocal list
	:e two
Now the 'list' option is not set, because ":set nolist" resets the global
value, ":setlocal list" only changes the local value and ":e two" gets the
global value.  Note that if you do this next: 
	:e one
You will get back the 'list' value as it was the last time you edited "one".
The options local to a window are remembered for each buffer.  This also
happens when the buffer is not loaded, but they are lost when the buffer is
wiped out :bwipe.

Special local window options			local-noglobal

The following local window options won't be copied over when new windows are
created, thus they behave slightly differently:

	Option		Reason	
	'previewwindow'	there can only be a single one
	'scroll'	specific to existing window
	'winfixheight'	specific to existing window
	'winfixwidth'	specific to existing window

Special local buffer options

The following local buffer options won't be copied over when new buffers are
created, thus they behave slightly differently:

	Option		Reason	
	'filetype'	explicitly set by autocommands
	'syntax'	explicitly set by autocommands
	'bufhidden'	denote special-buffers
	'buftype'	denote special-buffers
	'readonly'	will be detected automatically
	'modified'	will be detected automatically

							:setl :setlocal
:setl[ocal][!] ...	Like ":set" but set only the value local to the
			current buffer or window.  Not all options have a
			local value.  If the option does not have a local
			value the global value is set.
			With the "all" argument: display local values for all
			local options.
			Without argument: Display local values for all local
			options which are different from the default.
			When displaying a specific local option, show the
			local value.  For a global/local boolean option, when
			the global value is being used, "--" is displayed
			before the option name.
			For a global option the global value is
			shown (but that might change in the future).

:setl[ocal] {option}<	Set the local value of {option} to its global value by
			copying the value.

:se[t] {option}<	For global-local options: Remove the local value of
			{option}, so that the global value will be used.

							:setg :setglobal
:setg[lobal][!] ...	Like ":set" but set only the global value for a local
			option without changing the local value.
			When displaying an option, the global value is shown.
			With the "all" argument: display global values for all
			local options.
			Without argument: display global values for all local
			options which are different from the default.

For buffer-local and window-local options:
	Command		 global value	    local value 
      :set option=value	     set		set
 :setlocal option=value	      -			set
:setglobal option=value	     set		 -
      :set option?	      -		       display
 :setlocal option?	      -		       display
:setglobal option?	    display		 -


Global options with a local value			global-local

Options are global when you mostly use one value for all buffers and windows.
For some global options it's useful to sometimes have a different local value.
You can set the local value with ":setlocal".  That buffer or window will then
use the local value, while other buffers and windows continue using the global
value.

For example, you have two windows, both on C source code.  They use the global
'makeprg' option.  If you do this in one of the two windows: 
	:set makeprg=gmake
then the other window will switch to the same value.  There is no need to set
the 'makeprg' option in the other C source window too.
However, if you start editing a Perl file in a new window, you want to use
another 'makeprg' for it, without changing the value used for the C source
files.  You use this command: 
	:setlocal makeprg=perlmake
You can switch back to using the global value by making the local value empty: 
	:setlocal makeprg=
This only works for a string option.  For a number or boolean option you need
to use the "<" flag, like this: 
	:setlocal autoread<
Note that for non-boolean and non-number options using "<" copies the global
value to the local value, it doesn't switch back to using the global value
(that matters when the global value changes later).  You can also use: 
	:set path<
This will make the local value of 'path' empty, so that the global value is
used.  Thus it does the same as: 
	:setlocal path=
Note: In the future more global options can be made global-local.  Using
":setlocal" on a global option might work differently then.

						option-value-function
Some options ('completefunc', 'imactivatefunc', 'imstatusfunc', 'omnifunc',
'operatorfunc', 'quickfixtextfunc', 'tagfunc' and 'thesaurusfunc') are set to
a function name or a function reference or a lambda function.  When using a
lambda it will be converted to the name, e.g. "<lambda>123".  Examples:

	set opfunc=MyOpFunc
	set opfunc=function('MyOpFunc')
	set opfunc=funcref('MyOpFunc')
	set opfunc={a\ ->\ MyOpFunc(a)}

Set to a script-local function: 
	set opfunc=s:MyLocalFunc
	set opfunc=<SID>MyLocalFunc
In Vim9 script the "s:" and "<SID>" can be omitted if the function exists in
the script: 
	set opfunc=MyLocalFunc

Set using a funcref variable: 
	let Fn = function('MyTagFunc')
	let &tagfunc = Fn

Set using a lambda expression: 
	let &tagfunc = {t -> MyTagFunc(t)}

Set using a variable with lambda expression: 
	let L = {a, b, c -> MyTagFunc(a, b , c)}
	let &tagfunc = L

In Vim9 script, in a compiled function, you can use a lambda, but a
closure does not work, because the function will be called without the
context of where it was defined.


Setting the filetype

:setf[iletype] [FALLBACK] {filetype}			:setf :setfiletype
			Set the 'filetype' option to {filetype}, but only if
			not done yet in a sequence of (nested) autocommands.
			This is short for: 
				:if !did_filetype()
				:  setlocal filetype={filetype}
				:endif
			This command is used in a filetype.vim file to avoid
			setting the 'filetype' option twice, causing different
			settings and syntax files to be loaded.

			When the optional FALLBACK argument is present, a
			later :setfiletype command will override the
			'filetype'.  This is to be used for filetype
			detections that are just a guess.  did_filetype()
			will return false after this command.

				option-window optwin
:bro[wse] se[t]			:set-browse :browse-set :opt :options
:opt[ions]		Open a window for viewing and setting all options.
			Options are grouped by function.
			Offers short help for each option.  Hit <CR> on the
			short help to open a help window with more help for
			the option.
			Modify the value of the option and hit <CR> on the
			"set" line to set the new value.  For window and
			buffer specific options, the last accessed window is
			used to set the option value in, unless this is a help
			window, in which case the window below help window is
			used (skipping the option-window).
			{not available when compiled without the +eval
			feature}

								$HOME
Using "~" is like using "$HOME", but it is only recognized at the start of an
option and after a space or comma.

On Unix systems "~user" can be used too.  It is replaced by the home directory
of user "user".  Example: 
    :set path=~mool/include,/usr/include,.

On Unix systems the form "${HOME}" can be used too.  The name between {} can
contain non-id characters then.  Note that if you want to use this for the
"gf" command, you need to add the '{' and '}' characters to 'isfname'.

NOTE: expanding environment variables and "~/" is only done with the ":set"
command, not when assigning a value to an option with ":let".

							$HOME-windows
On MS-Windows, if $HOME is not defined as an environment variable, then
at runtime Vim will set it to the expansion of $HOMEDRIVE$HOMEPATH.
If $HOMEDRIVE is not set then $USERPROFILE is used.

This expanded value is not exported to the environment, this matters when
running an external command: 
	:echo system('set | findstr ^HOME=')
and 
	:echo luaeval('os.getenv("HOME")')
should echo nothing (an empty string) despite exists('$HOME') being true.
When setting $HOME to a non-empty string it will be exported to the
subprocesses.


Note the maximum length of an expanded option is limited.  How much depends on
the system, mostly it is something like 256 or 1024 characters.

							:fix :fixdel
:fix[del]		Set the value of 't_kD':
				't_kb' is     't_kD' becomes	
				  CTRL-?	CTRL-H
				not CTRL-?	CTRL-?

			(CTRL-? is 0o177 octal, 0x7f hex)

			If your delete key terminal code is wrong, but the
			code for backspace is alright, you can put this in
			your .vimrc: 
				:fixdel
			This works no matter what the actual code for
			backspace is.

			If the backspace key terminal code is wrong you can
			use this: 
				:if &term == "termname"
				:  set t_kb=^V<BS>
				:  fixdel
				:endif
			Where "^V" is CTRL-V and "<BS>" is the backspace key
			(don't type four characters!).  Replace "termname"
			with your terminal name.

			If your <Delete> key sends a strange key sequence (not
			CTRL-? or CTRL-H) you cannot use ":fixdel".  Then use: 
				:if &term == "termname"
				:  set t_kD=^V<Delete>
				:endif
			Where "^V" is CTRL-V and "<Delete>" is the delete key
			(don't type eight characters!).  Replace "termname"
			with your terminal name.

							Linux-backspace
			Note about Linux: By default the backspace key
			produces CTRL-?, which is wrong.  You can fix it by
			putting this line in your rc.local: 
				echo "keycode 14 = BackSpace" | loadkeys

							NetBSD-backspace
			Note about NetBSD: If your backspace doesn't produce
			the right code, try this: 
				xmodmap -e "keycode 22 = BackSpace"
			If this works, add this in your .Xmodmap file: 
				keysym 22 = BackSpace
			You need to restart for this to take effect.

==============================================================================
2. Automatically setting options			auto-setting

Besides changing options with the ":set" command, there are three alternatives
to set options automatically for one or more files:

1. When starting Vim initializations are read from various places.  See
   initialization.  Most of them are performed for all editing sessions,
   and some of them depend on the directory where Vim is started.
   You can create an initialization file with :mkvimrc, :mkview and
   :mksession.
2. If you start editing a new file, the automatic commands are executed.
   This can be used to set options for files matching a particular pattern and
   many other things.  See autocommand.
3. If you start editing a new file, and the 'modeline' option is on, a
   number of lines at the beginning and end of the file are checked for
   modelines.  This is explained here.

					modeline vim: vi: ex: E520
There are two forms of modelines.  The first form:
	[text{white}]{vi:vim:ex:}[white]{options}

[text{white}]		empty or any text followed by at least one blank
			character (<Space> or <Tab>); "ex:" always requires at
			least one blank character
{vi:|vim:|ex:}		the string "vi:", "vim:" or "ex:"
[white]			optional white space
{options}		a list of option settings, separated with white space
			or ':', where each part between ':' is the argument
			for a ":set" command (can be empty)

Examples:
   vi:noai:sw=3 ts=6 
   vim: tw=77 

The second form (this is compatible with some versions of Vi):

	[text{white}]{vi:vim:Vim:|ex:}[white]se[t] {options}:[text]

[text{white}]		empty or any text followed by at least one blank
			character (<Space> or <Tab>); "ex:" always requires at
			least one blank character
{vi:|vim:|Vim:|ex:}	the string "vi:", "vim:", "Vim:" or "ex:"
[white]			optional white space
se[t]			the string "set " or "se " (note the space); When
			"Vim" is used it must be "set".
{options}		a list of options, separated with white space, which
			is the argument for a ":set" command
:			a colon
[text]			any text or empty

Examples:
   /* vim: set ai tw=75: */ 
   /* Vim: set ai tw=75: */ 

The white space before {vi:|vim:|Vim:|ex:} is required.  This minimizes the
chance that a normal word like "lex:" is caught.  There is one exception:
"vi:" and "vim:" can also be at the start of the line (for compatibility with
version 3.0).  Using "ex:" at the start of the line will be ignored (this
could be short for "example:").

If the modeline is disabled within a modeline, subsequent modelines will be
ignored.  This is to allow turning off modeline on a per-file basis.  This is
useful when a line looks like a modeline but isn't.  For example, it would be
good to start a YAML file containing strings like "vim:" with
    # vim: nomodeline 
so as to avoid modeline misdetection.  Following options on the same line
after modeline deactivation, if any, are still evaluated (but you would
normally not have any).

							modeline-local
The options are set like with ":setlocal": The new value only applies to the
buffer and window that contain the file.  Although it's possible to set global
options from a modeline, this is unusual.  If you have two windows open and
the files in it set the same global option to a different value, the result
depends on which one was opened last.

When editing a file that was already loaded, only the window-local options
from the modeline are used.  Thus if you manually changed a buffer-local
option after opening the file, it won't be changed if you edit the same buffer
in another window.  But window-local options will be set.

							modeline-version
If the modeline is only to be used for some versions of Vim, the version
number can be specified where "vim:" or "Vim:" is used:
	vim{vers}:	version {vers} or later
	vim<{vers}:	version before {vers}
	vim={vers}:	version {vers}
	vim>{vers}:	version after {vers}
{vers} is 700 for Vim 7.0 (hundred times the major version plus minor).
For example, to use a modeline only for Vim 7.0:
	/* vim700: set foldmethod=marker */ 
To use a modeline for Vim after version 7.2:
	/* vim>702: set cole=2: */ 
There can be no blanks between "vim" and the ":".


The number of lines that are checked can be set with the 'modelines' option.
If 'modeline' is off or 'modelines' is 0 no lines are checked.

Note that for the first form all of the rest of the line is used, thus a line
like:
   /* vi:ts=4: */ 
will give an error message for the trailing "*/".  This line is OK:
   /* vi:set ts=4: */ 

If an error is detected the rest of the line is skipped.

If you want to include a ':' in a set command precede it with a '\'.  The
backslash in front of the ':' will be removed.  Example:
   /* vi:set fillchars=stl\:^,vert\:\|: */ 
This sets the 'fillchars' option to "stl:^,vert:\|".  Only a single backslash
before the ':' is removed.  Thus to include "\:" you have to specify "\\:".
							E992
No other commands than "set" are supported, for security reasons (somebody
might create a Trojan horse text file with modelines).  And not all options
can be set.  For some options a flag is set, so that when the value is used
the sandbox is effective.  Some options can only be set from the modeline
when 'modelineexpr' is set (the default is off).

Still, there is always a small risk that a modeline causes trouble.  E.g.,
when some joker sets 'textwidth' to 5 all your lines are wrapped unexpectedly.
So disable modelines before editing untrusted text.  The mail ftplugin does
this, for example.

Hint: If you would like to do something else than setting an option, you could
define an autocommand that checks the file for a specific string.  For
example: 
	au BufReadPost * if getline(1) =~ "VAR" | call SetVar() | endif
And define a function SetVar() that does something with the line containing
"VAR".

==============================================================================
3. Options summary					option-summary

In the list below all the options are mentioned with their full name and with
an abbreviation if there is one.  Both forms may be used.

In this document when a boolean option is "set" that means that ":set option"
is entered.  When an option is "reset", ":set nooption" is used.

For some options there are two default values: The "Vim default", which is
used when 'compatible' is not set, and the "Vi default", which is used when
'compatible' is set.

Most options are the same in all windows and buffers.  There are a few that
are specific to how the text is presented in a window.  These can be set to a
different value in each window.  For example the 'list' option can be set in
one window and reset in another for the same text, giving both types of view
at the same time.  There are a few options that are specific to a certain
file.  These can have a different value for each file or buffer.  For example
the 'textwidth' option can be 78 for a normal text file and 0 for a C
program.

	global			one option for all buffers and windows
	local to window		each window has its own copy of this option
	local to buffer		each buffer has its own copy of this option

When creating a new window the option values from the currently active window
are used as a default value for the window-specific options.  For the
buffer-specific options this depends on the 's' and 'S' flags in the
'cpoptions' option.  If 's' is included (which is the default) the values for
buffer options are copied from the currently active buffer when a buffer is
first entered.  If 'S' is present the options are copied each time the buffer
is entered, this is almost like having global options.  If 's' and 'S' are not
present, the options are copied from the currently active buffer when the
buffer is created.

Hidden options						hidden-options

Not all options are supported in all versions.  This depends on the supported
features and sometimes on the system.  A remark about this is in curly braces
below.  When an option is not supported it may still be set without getting an
error, this is called a hidden option.  You can't get the value of a hidden
option though, it is not stored.

To test if option "foo" can be used with ":set" use something like this: 
	if exists('&foo')
This also returns true for a hidden option.  To test if option "foo" is really
supported use something like this: 
	if exists('+foo')

							E355
A jump table for the options with a short description can be found at Q_op.

					'aleph' 'al' aleph Aleph
'aleph' 'al'		number	(default 128 for MS-Windows, 224 otherwise)
			global
			{only available when compiled with the +rightleft
			feature}
	The ASCII code for the first letter of the Hebrew alphabet.  The
	routine that maps the keyboard in Hebrew mode, both in Insert mode
	(when hkmap is set) and on the command-line (when hitting CTRL-_)
	outputs the Hebrew characters in the range [aleph..aleph+26].
	aleph=128 applies to PC code, and aleph=224 applies to ISO 8859-8.
	See rileft.txt.

			'allowrevins' 'ari' 'noallowrevins' 'noari'
'allowrevins' 'ari'	boolean	(default off)
			global
			{only available when compiled with the +rightleft
			feature}
	Allow CTRL-_ in Insert and Command-line mode.  This is default off, to
	avoid that users that accidentally type CTRL-_ instead of SHIFT-_ get
	into reverse Insert mode, and don't know how to get out.  See
	'revins'.
	NOTE: This option is reset when 'compatible' is set.

			 'altkeymap' 'akm' 'noaltkeymap' 'noakm'
'altkeymap' 'akm'	boolean (default off)
			global
			{only available when compiled with the +farsi
			feature}
	This option was for using Farsi, which has been removed.  See
	farsi.txt.

						'ambiwidth' 'ambw'
'ambiwidth' 'ambw'	string (default: "single")
			global
	Only effective when 'encoding' is "utf-8" or another Unicode encoding.
	Tells Vim what to do with characters with East Asian Width Class
	Ambiguous (such as Euro, Registered Sign, Copyright Sign, Greek
	letters, Cyrillic letters).

	There are currently two possible values:
	"single":	Use the same width as characters in US-ASCII.  This is
			expected by most users.
	"double":	Use twice the width of ASCII characters.
							E834 E835
	The value "double" cannot be used if 'listchars' or 'fillchars'
	contains a character that would be double width.  These errors may
	also be given when calling setcellwidths().

	The values are overruled for characters specified with
	setcellwidths().

	There are a number of CJK fonts for which the width of glyphs for
	those characters are solely based on how many octets they take in
	legacy/traditional CJK encodings.  In those encodings, Euro,
	Registered sign, Greek/Cyrillic letters are represented by two octets,
	therefore those fonts have "wide" glyphs for them.  This is also
	true of some line drawing characters used to make tables in text
	file.  Therefore, when a CJK font is used for GUI Vim or
	Vim is running inside a terminal (emulators) that uses a CJK font
	(or Vim is run inside an xterm invoked with "-cjkwidth" option.),
	this option should be set to "double" to match the width perceived
	by Vim with the width of glyphs in the font.  Perhaps it also has
	to be set to "double" under CJK MS-Windows when the system locale is
	set to one of CJK locales.  See Unicode Standard Annex #11
	(http://www.unicode.org/reports/tr11).

	Vim may set this option automatically at startup time when Vim is
	compiled with the +termresponse feature and if t_u7 is set to the
	escape sequence to request cursor position report.  The response can
	be found in v:termu7resp.

			'antialias' 'anti' 'noantialias' 'noanti'
'antialias' 'anti'	boolean (default off, on for MacVim)
			global
			{only available when compiled with GUI enabled
			on macOS}
	This option only has an effect in the GUI version of Vim on macOS
	v10.2 or later.  When on, Vim will use smooth ("antialiased") fonts,
	which can be easier to read at certain sizes on certain displays.

				'arabic' 'arab' 'noarabic' 'noarab'
'arabic' 'arab'		boolean (default off)
			local to window
			{only available when compiled with the +arabic
			feature}
	This option can be set to start editing Arabic text.
	Setting this option will:
	- Set the 'rightleft' option, unless 'termbidi' is set.
	- Set the 'arabicshape' option, unless 'termbidi' is set.
	- Set the 'keymap' option to "arabic"; in Insert mode CTRL-^ toggles
	  between typing English and Arabic key mapping.
	- Set the 'delcombine' option
	Note that 'encoding' must be "utf-8" for working with Arabic text.

	Resetting this option will:
	- Reset the 'rightleft' option.
	- Disable the use of 'keymap' (without changing its value).
	Note that 'arabicshape' and 'delcombine' are not reset (it is a global
	option).
	NOTE: This option is reset when 'compatible' is set.
	Also see arabic.txt.

					'arabicshape' 'arshape'
					'noarabicshape' 'noarshape'
'arabicshape' 'arshape'	boolean (default on)
			global
			{only available when compiled with the +arabic
			feature}
	When on and 'termbidi' is off, the required visual character
	corrections that need to take place for displaying the Arabic language
	take effect.  Shaping, in essence, gets enabled; the term is a broad
	one which encompasses:
	  a) the changing/morphing of characters based on their location
	     within a word (initial, medial, final and stand-alone).
	  b) the enabling of the ability to compose characters
	  c) the enabling of the required combining of some characters
	When disabled the display shows each character's true stand-alone
	form.
	Arabic is a complex language which requires other settings, for
	further details see arabic.txt.
	NOTE: This option is set when 'compatible' is set.

			'autochdir' 'acd' 'noautochdir' 'noacd'
'autochdir' 'acd'	boolean (default off)
			global
			{only available when compiled with it, use
			exists("+autochdir") to check}
	When on, Vim will change the current working directory whenever you
	open a file, switch buffers, delete a buffer or open/close a window.
	It will change to the directory containing the file which was opened
	or selected.  When a buffer has no name it also has no directory, thus
	the current directory won't change when navigating to it.
	Note: When this option is on some plugins may not work.

			'autoindent' 'ai' 'noautoindent' 'noai'
'autoindent' 'ai'	boolean	(default off)
			local to buffer
	Copy indent from current line when starting a new line (typing <CR>
	in Insert mode or when using the "o" or "O" command).  If you do not
	type anything on the new line except <BS> or CTRL-D and then type
	<Esc>, CTRL-O or <CR>, the indent is deleted again.  Moving the cursor
	to another line has the same effect, unless the 'I' flag is included
	in 'cpoptions'.
	When autoindent is on, formatting (with the "gq" command or when you
	reach 'textwidth' in Insert mode) uses the indentation of the first
	line.
	When 'smartindent' or 'cindent' is on the indent is changed in
	a different way.
	The 'autoindent' option is reset when the 'paste' option is set and
	restored when 'paste' is reset.

				 'autoread' 'ar' 'noautoread' 'noar'
'autoread' 'ar'		boolean	(default off)
			global or local to buffer global-local
	When a file has been detected to have been changed outside of Vim and
	it has not been changed inside of Vim, automatically read it again.
	When the file has been deleted this is not done, so you have the text
	from before it was deleted.  When it appears again then it is read.
	timestamp
	If this option has a local value, use this command to switch back to
	using the global value: 
		:set autoread<


			'autoshelldir' 'asd' 'noautoshelldir' 'noasd'
'autoshelldir' 'asd'	boolean (default off)
			global
	When on, Vim will change the current working directory whenever you
	change the directory of the shell running in a terminal window. You
	need proper setting-up, so whenever the shell's pwd changes an OSC 7
	escape sequence will be emitted.  For example, on Linux, you can
	source /etc/profile.d/vte.sh in your shell profile if you use bash or
	zsh.  For bash this should work (put it in a bash init file): 
		if [[ -n "$VIM_TERMINAL" ]]; then
		    PROMPT_COMMAND='_vim_sync_PWD'
		    function _vim_sync_PWD() {
			printf '\033]7;file://%s\033\\' "$PWD"
		    }
		fi

	Or, in a zsh init file: 
		if [[ -n "$VIM_TERMINAL" ]]; then
		    autoload -Uz add-zsh-hook
		    add-zsh-hook -Uz chpwd _vim_sync_PWD
		    function _vim_sync_PWD() {
			printf '\033]7;file://%s\033\\' "$PWD"
		    }
		fi

	In a fish init file: 
		if test -n "$VIM_TERMINAL"
		    function _vim_sync_PWD --on-variable=PWD
			printf '\033]7;file://%s\033\\' "$PWD"
		    end
		end

	You can find an alternative method at terminal-autoshelldir.
	When the parsing of the OSC sequence fails you get E1179 .

				 'autowrite' 'aw' 'noautowrite' 'noaw'
'autowrite' 'aw'	boolean	(default off)
			global
	Write the contents of the file, if it has been modified, on each
	:next, :rewind, :last, :first, :previous, :stop,
	:suspend, :tag, :!, :make, CTRL-] and CTRL-^ command; and when
	a :buffer, CTRL-O, CTRL-I, '{A-Z0-9}, or `{A-Z0-9} command takes one
	to another file.
	A buffer is not written if it becomes hidden, e.g. when 'bufhidden' is
	set to "hide" and :next is used.
	Note that for some commands the 'autowrite' option is not used, see
	'autowriteall' for that.
	Some buffers will not be written, specifically when 'buftype' is
	"nowrite", "nofile", "terminal" or "prompt".
	USE WITH CARE: If you make temporary changes to a buffer that you
	don't want to be saved this option may cause it to be saved anyway.
	Renaming the buffer with ":file {name}" may help avoid this.

			 'autowriteall' 'awa' 'noautowriteall' 'noawa'
'autowriteall' 'awa'	boolean	(default off)
			global
	Like 'autowrite', but also used for commands ":edit", ":enew", ":quit",
	":qall", ":exit", ":xit", ":recover" and closing the Vim window.
	Setting this option also implies that Vim behaves like 'autowrite' has
	been set.

							'background' 'bg'
'background' 'bg'	string	(default "dark" or "light", see below)
			global
	When set to "dark", Vim will try to use colors that look good on a
	dark background.  When set to "light", Vim will try to use colors that
	look good on a light background.  Any other value is illegal.
	Vim tries to set the default value according to the terminal used.
	This will not always be correct.
	Setting this option does not change the background color, it tells Vim
	what the background color looks like.  For changing the background
	color, see :hi-normal.

	When 'background' is changed Vim will adjust the default color groups
	for the new value.  But the colors used for syntax highlighting will
	not change.					g:colors_name
	When a color scheme is loaded (the "g:colors_name" variable is set)
	changing 'background' will cause the color scheme to be reloaded.  If
	the color scheme adjusts to the value of 'background' this will work.
	However, if the color scheme sets 'background' itself the effect may
	be undone.  First delete the "g:colors_name" variable when needed.

	When setting 'background' to the default value with: 
		:set background&
	Vim will guess the value.  In the GUI this should work correctly,
	in other cases Vim might not be able to guess the right value.
	If the GUI supports a dark theme, you can use the "d" flag in
	'guioptions', see 'go-d'.

	When the t_RB option is set, Vim will use it to request the background
	color from the terminal.  If the returned RGB value is dark/light and
	'background' is not dark/light, 'background' will be set and the
	screen is redrawn.  This may have side effects, make t_BG empty in
	your .vimrc if you suspect this problem.  The response to t_RB can
	be found in v:termrbgresp.

	When starting the GUI, the default value for 'background' will be
	"light".  When the value is not set in the .gvimrc, and Vim detects
	that the background is actually quite dark, 'background' is set to
	"dark".  But this happens only AFTER the .gvimrc file has been read
	(because the window needs to be opened to find the actual background
	color).  To get around this, force the GUI window to be opened by
	putting a ":gui" command in the .gvimrc file, before where the value
	of 'background' is used (e.g., before ":syntax on").

	For MS-Windows the default is "dark".
	For other systems "dark" is used when 'term' is "linux",
	"screen.linux", "cygwin" or "putty", or $COLORFGBG suggests a dark
	background.  Otherwise the default is "light".

	The :terminal command and the term_start() function use the
	'background' value to decide whether the terminal window will start
	with a white or black background.

	Normally this option would be set in the .vimrc file.  Possibly
	depending on the terminal name.  Example: 
		:if &term == "pcterm"
		:  set background=dark
		:endif
	When this option is set, the default settings for the highlight groups
	will change.  To use other settings, place ":highlight" commands AFTER
	the setting of the 'background' option.
	This option is also used in the "$VIMRUNTIME/syntax/syntax.vim" file
	to select the colors for syntax highlighting.  After changing this
	option, you must load syntax.vim again to see the result.  This can be
	done with ":syntax on".

							'backspace' 'bs'
'backspace' 'bs'	string	(default "", set to "indent,eol,start"
							    in defaults.vim)
			global
	Influences the working of <BS>, <Del>, CTRL-W and CTRL-U in Insert
	mode.  This is a list of items, separated by commas.  Each item allows
	a way to backspace over something:
	value	effect	
	indent	allow backspacing over autoindent
	eol	allow backspacing over line breaks (join lines)
	start	allow backspacing over the start of insert; CTRL-W and CTRL-U
		stop once at the start of insert.
	nostop	like start, except CTRL-W and CTRL-U do not stop at the start of
		insert.

	When the value is empty, Vi compatible backspacing is used, none of
	the ways mentioned for the items above are possible.

	For backwards compatibility with version 5.4 and earlier:
	value	effect	
	  0	same as ":set backspace=" (Vi compatible)
	  1	same as ":set backspace=indent,eol"
	  2	same as ":set backspace=indent,eol,start"
	  3	same as ":set backspace=indent,eol,nostop"

	See :fixdel if your <BS> or <Del> key does not do what you want.
	NOTE: This option is set to "" when 'compatible' is set.

				'backup' 'bk' 'nobackup' 'nobk'
'backup' 'bk'		boolean	(default off)
			global
	Make a backup before overwriting a file.  Leave it around after the
	file has been successfully written.  If you do not want to keep the
	backup file, but you do want a backup while the file is being
	written, reset this option and set the 'writebackup' option (this is
	the default).  If you do not want a backup file at all reset both
	options (use this if your file system is almost full).  See the
	backup-table for more explanations.
	When the 'backupskip' pattern matches, a backup is not made anyway.
	When 'patchmode' is set, the backup may be renamed to become the
	oldest version of a file.
	NOTE: This option is reset when 'compatible' is set.

						'backupcopy' 'bkc'
'backupcopy' 'bkc'	string	(Vi default for Unix: "yes", otherwise: "auto")
			global or local to buffer global-local
	When writing a file and a backup is made, this option tells how it's
	done.  This is a comma-separated list of words.

	The main values are:
	"yes"	make a copy of the file and overwrite the original one
	"no"	rename the file and write a new one
	"auto"	one of the previous, what works best

	Extra values that can be combined with the ones above are:
	"breaksymlink"	always break symlinks when writing
	"breakhardlink"	always break hardlinks when writing

	Making a copy and overwriting the original file:
	- Takes extra time to copy the file.
	+ When the file has special attributes, is a (hard/symbolic) link or
	  has a resource fork, all this is preserved.
	- When the file is a link the backup will have the name of the link,
	  not of the real file.

	Renaming the file and writing a new one:
	+ It's fast.
	- Sometimes not all attributes of the file can be copied to the new
	  file.
	- When the file is a link the new file will not be a link.

	The "auto" value is the middle way: When Vim sees that renaming the
	file is possible without side effects (the attributes can be passed on
	and the file is not a link) that is used.  When problems are expected,
	a copy will be made.

	The "breaksymlink" and "breakhardlink" values can be used in
	combination with any of "yes", "no" and "auto".  When included, they
	force Vim to always break either symbolic or hard links by doing
	exactly what the "no" option does, renaming the original file to
	become the backup and writing a new file in its place.  This can be
	useful for example in source trees where all the files are symbolic or
	hard links and any changes should stay in the local source tree, not
	be propagated back to the original source.
							crontab
	One situation where "no" and "auto" will cause problems: A program
	that opens a file, invokes Vim to edit that file, and then tests if
	the open file was changed (through the file descriptor) will check the
	backup file instead of the newly created file.  "crontab -e" is an
	example.

	When a copy is made, the original file is truncated and then filled
	with the new text.  This means that protection bits, owner and
	symbolic links of the original file are unmodified.  The backup file,
	however, is a new file, owned by the user who edited the file.  The
	group of the backup is set to the group of the original file.  If this
	fails, the protection bits for the group are made the same as for
	others.

	When the file is renamed, this is the other way around: The backup has
	the same attributes of the original file, and the newly written file
	is owned by the current user.  When the file was a (hard/symbolic)
	link, the new file will not!  That's why the "auto" value doesn't
	rename when the file is a link.  The owner and group of the newly
	written file will be set to the same ones as the original file, but
	the system may refuse to do this.  In that case the "auto" value will
	again not rename the file.

	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

						'backupdir' 'bdir'
'backupdir' 'bdir'	string	(default for Amiga: ".,t:",
				 for Win32: ".,$TEMP,c:/tmp,c:/temp"
				 for Unix: ".,~/tmp,~/")
			global
	List of directories for the backup file, separated with commas.
	- The backup file will be created in the first directory in the list
	  where this is possible.  The directory must exist, Vim will not
	  create it for you.
	- Empty means that no backup file will be created ('patchmode' is
	  impossible!).  Writing may fail because of this.
	- A directory "." means to put the backup file in the same directory
	  as the edited file.
	- A directory starting with "./" (or ".\" for MS-Windows) means to put
	  the backup file relative to where the edited file is.  The leading
	  "." is replaced with the path name of the edited file.
	  ("." inside a directory name has no special meaning).
	- Spaces after the comma are ignored, other spaces are considered part
	  of the directory name.  To have a space at the start of a directory
	  name, precede it with a backslash.
	- To include a comma in a directory name precede it with a backslash.
	- A directory name may end in an '/'.
	- For Unix and Win32, if a directory ends in two path separators "//",
	  the backup file name will be built from the complete path to the
	  file with all path separators changed to percent '%' signs. This
	  will ensure file name uniqueness in the backup directory.
	  On Win32, it is also possible to end with "\\".  However, When a
	  separating comma is following, you must use "//", since "\\" will
	  include the comma in the file name. Therefore it is recommended to
	  use '//', instead of '\\'.
	- Environment variables are expanded :set_env.
	- Careful with '\' characters, type one before a space, type two to
	  get one in the option (see option-backslash), for example: 
	    :set bdir=c:\\tmp,\ dir\\,with\\,commas,\\\ dir\ with\ spaces
	- For backwards compatibility with Vim version 3.0 a '>' at the start
	  of the option is removed.
	See also 'backup' and 'writebackup' options.
	If you want to hide your backup files on Unix, consider this value: 
		:set backupdir=./.backup,~/.backup,.,/tmp
	You must create a ".backup" directory in each directory and in your
	home directory for this to work properly.
	The use of :set+= and :set-= is preferred when adding or removing
	directories from the list.  This avoids problems when a future version
	uses another default.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'backupext' 'bex' E589
'backupext' 'bex'	string	(default "~", for VMS: "_")
			global
	String which is appended to a file name to make the name of the
	backup file.  The default is quite unusual, because this avoids
	accidentally overwriting existing files with a backup file.  You might
	prefer using ".bak", but make sure that you don't have files with
	".bak" that you want to keep.
	Only normal file name characters can be used; "/\*?[|<>" are illegal.

	If you like to keep a lot of backups, you could use a BufWritePre
	autocommand to change 'backupext' just before writing the file to
	include a timestamp. 
		:au BufWritePre * let &bex = '-' .. strftime("%Y%b%d%X") .. '~'
	Use 'backupdir' to put the backup in a different directory.

						'backupskip' 'bsk'
'backupskip' 'bsk'	string	(default: "$TMPDIR/*,$TMP/*,$TEMP/*"
				 Unix: "/tmp/*,$TMPDIR/*,$TMP/*,$TEMP/*"
				 Mac: "/private/tmp/*,$TMPDIR/*,$TMP/*,$TEMP/*")
			global
	A list of file patterns.  When one of the patterns matches with the
	name of the file which is written, no backup file is created.  Both
	the specified file name and the full path name of the file are used.
	The pattern is used like with :autocmd, see autocmd-patterns.
	Watch out for special characters, see option-backslash.
	When $TMPDIR, $TMP or $TEMP is not defined, it is not used for the
	default value.  "/tmp/*" is only used for Unix.

	WARNING: Not having a backup file means that when Vim fails to write
	your buffer correctly and then, for whatever reason, Vim exits, you
	lose both the original file and what you were writing.  Only disable
	backups if you don't care about losing the file.

	Note that environment variables are not expanded.  If you want to use
	$HOME you must expand it explicitly, e.g.: 
		:let &backupskip = escape(expand('$HOME'), '\') .. '/tmp/*'

	Note that the default also makes sure that "crontab -e" works (when a
	backup would be made by renaming the original file crontab won't see
	the newly created file).  Also see 'backupcopy' and crontab.

						'balloondelay' 'bdlay'
'balloondelay' 'bdlay'	number	(default: 600)
			global
			{only available when compiled with the +balloon_eval
			feature}
	Delay in milliseconds before a balloon may pop up.  See balloon-eval.

		       'ballooneval' 'beval' 'noballooneval' 'nobeval'
'ballooneval' 'beval'	boolean	(default off)
			global
			{only available when compiled with the +balloon_eval
			feature}
	Switch on the balloon-eval functionality for the GUI.

		       'balloonevalterm' 'bevalterm' 'noballoonevalterm'
		       'nobevalterm'
'balloonevalterm' 'bevalterm'	boolean	(default off)
			global
			{only available when compiled with the
			+balloon_eval_term feature}
	Switch on the balloon-eval functionality for the terminal.

						     'balloonexpr' 'bexpr'
'balloonexpr' 'bexpr'	string	(default "")
			global or local to buffer global-local
			{only available when compiled with the +balloon_eval
			feature}
	Expression for text to show in evaluation balloon.  It is only used
	when 'ballooneval' or 'balloonevalterm' is on.  These variables can be
	used:

	v:beval_bufnr	number of the buffer in which balloon is going to show
	v:beval_winnr	number of the window
	v:beval_winid	ID of the window
	v:beval_lnum	line number
	v:beval_col	column number (byte index)
	v:beval_text	word under or after the mouse pointer

	Instead of showing a balloon, which is limited to plain text, consider
	using a popup window, see popup_beval_example.  A popup window can
	use highlighting and show a border.

	The evaluation of the expression must not have side effects!
	Example: 
    function MyBalloonExpr()
	return 'Cursor is at line ' .. v:beval_lnum ..
		\ ', column ' .. v:beval_col ..
		\ ' of file ' ..  bufname(v:beval_bufnr) ..
		\ ' on word "' .. v:beval_text .. '"'
    endfunction
    set bexpr=MyBalloonExpr()
    set ballooneval balloonevalterm

	Also see balloon_show(), it can be used if the content of the balloon
	is to be fetched asynchronously.  In that case evaluating
	'balloonexpr' should result in an empty string.  If you get a balloon
	with only "0" you probably didn't return anything from your function.

	NOTE: The balloon is displayed only if the cursor is on a text
	character.  If the result of evaluating 'balloonexpr' is not empty,
	Vim does not try to send a message to an external debugger (Netbeans
	or Sun Workshop).

	If the expression starts with s: or <SID>, then it is replaced with
	the script ID (local-function). Example: 
		set bexpr=s:MyBalloonExpr()
		set bexpr=<SID>SomeBalloonExpr()
	Otherwise, the expression is evaluated in the context of the script
	where the option was set, thus script-local items are available.

	The expression will be evaluated in the sandbox when set from a
	modeline, see sandbox-option.
	This option cannot be set in a modeline when 'modelineexpr' is off.

	It is not allowed to change text or jump to another window while
	evaluating 'balloonexpr', see textlock.

	To check whether line breaks in the balloon text work use this check: 
		if has("balloon_multiline")
	When they are supported "\n" characters will start a new line.  If the
	expression evaluates to a List this is equal to using each List item
	as a string and putting "\n" in between them.
	NOTE: This option is set to "" when 'compatible' is set.

						'belloff' 'bo'
'belloff' 'bo'		string	(default "")
			global
	Specifies for which events the bell will not be rung. It is a comma
	separated list of items. For each item that is present, the bell
	will be silenced. This is most useful to specify specific events in
	insert mode to be silenced.
	You can also make it flash by using 'visualbell'.

	item	    meaning when present	
	all	    All events.
	backspace   When hitting <BS> or <Del> and deleting results in an
		    error.
	cursor	    Fail to move around using the cursor keys or
		    <PageUp>/<PageDown> in Insert-mode.
	complete    Error occurred when using i_CTRL-X_CTRL-K or
		    i_CTRL-X_CTRL-T.
	copy	    Cannot copy char from insert mode using i_CTRL-Y or
		    i_CTRL-E.
	ctrlg	    Unknown Char after <C-G> in Insert mode.
	error	    Other Error occurred (e.g. try to join last line)
		    (mostly used in Normal-mode or Cmdline-mode).
	esc	    hitting <Esc> in Normal-mode.
	ex	    In Visual-mode, hitting Q results in an error.
	hangul	    Ignored.
	insertmode  Pressing <Esc> in 'insertmode'.
	lang	    Calling the beep module for Lua/Mzscheme/TCL.
	mess	    No output available for g<.
	showmatch   Error occurred for 'showmatch' function.
	operator    Empty region error cpo-E.
	register    Unknown register after <C-R> in Insert-mode.
	shell	    Bell from shell output :!.
	spell	    Error happened on spell suggest.
	term	    Bell from :terminal output.
	wildmode    More matches in cmdline-completion available
		    (depends on the 'wildmode' setting).

	This is most useful to fine tune when in Insert mode the bell should
	be rung. For Normal mode and Ex commands, the bell is often rung to
	indicate that an error occurred. It can be silenced by adding the
	"error" keyword.

				     'binary' 'bin' 'nobinary' 'nobin'
'binary' 'bin'		boolean	(default off)
			local to buffer
	This option should be set before editing a binary file.  You can also
	use the -b Vim argument.  When this option is switched on a few
	options will be changed (also when it already was on):
		'textwidth'  will be set to 0
		'wrapmargin' will be set to 0
		'modeline'   will be off
		'expandtab'  will be off
	Also, 'fileformat' and 'fileformats' options will not be used, the
	file is read and written like 'fileformat' was "unix" (a single <NL>
	separates lines).
	The 'fileencoding' and 'fileencodings' options will not be used, the
	file is read without conversion.
	NOTE: When you start editing a(nother) file while the 'bin' option is
	on, settings from autocommands may change the settings again (e.g.,
	'textwidth'), causing trouble when editing.  You might want to set
	'bin' again when the file has been loaded.
	The previous values of these options are remembered and restored when
	'bin' is switched from on to off.  Each buffer has its own set of
	saved option values.
	To edit a file with 'binary' set you can use the ++bin argument.
	This avoids you have to do ":set bin", which would have effect for all
	files you edit.
	When writing a file the <EOL> for the last line is only written if
	there was one in the original file (normally Vim appends an <EOL> to
	the last line if there is none; this would make the file longer).  See
	the 'endofline' option.

			'bioskey' 'biosk' 'nobioskey' 'nobiosk'
'bioskey' 'biosk'	boolean	(default on)
			global
			{only for MS-DOS}
	This was for MS-DOS and is no longer supported.

						'blurradius' 'blur'
'blurradius' 'blur'	number  (default 0)
			global
			{not in Vi}
			{only in MacVim GUI}
	When 'transparency' is in effect, a positive value adds a blur effect
	to the window background.

							'bomb' 'nobomb'
'bomb'			boolean	(default off)
			local to buffer
	When writing a file and the following conditions are met, a BOM (Byte
	Order Mark) is prepended to the file:
	- this option is on
	- the 'binary' option is off
	- 'fileencoding' is "utf-8", "ucs-2", "ucs-4" or one of the little/big
	  endian variants.
	Some applications use the BOM to recognize the encoding of the file.
	Often used for UCS-2 files on MS-Windows.  For other applications it
	causes trouble, for example: "cat file1 file2" makes the BOM of file2
	appear halfway through the resulting file.  Gcc doesn't accept a BOM.
	When Vim reads a file and 'fileencodings' starts with "ucs-bom", a
	check for the presence of the BOM is done and 'bomb' set accordingly.
	Unless 'binary' is set, it is removed from the first line, so that you
	don't see it when editing.  When you don't change the options, the BOM
	will be restored when writing the file.

						'breakat' 'brk'
'breakat' 'brk'		string	(default " ^I!@*-+;:,./?")
			global
			{not available when compiled without the +linebreak
			feature}
	This option lets you choose which characters might cause a line
	break if 'linebreak' is on.  Only works for ASCII and also for 8-bit
	characters when 'encoding' is an 8-bit encoding.

			'breakindent' 'bri' 'nobreakindent' 'nobri'
'breakindent' 'bri'	boolean (default off)
			local to window
			{not available when compiled without the +linebreak
			feature}
	Every wrapped line will continue visually indented (same amount of
	space as the beginning of that line), thus preserving horizontal blocks
	of text.
	NOTE: This option is reset when 'compatible' is set.

						'breakindentopt' 'briopt'
'breakindentopt' 'briopt' string (default empty)
			local to window
			{not available when compiled without the +linebreak
			feature}
	Settings for 'breakindent'. It can consist of the following optional
	items and must be separated by a comma:
		min:{n}	    Minimum text width that will be kept after
			    applying 'breakindent', even if the resulting
			    text should normally be narrower. This prevents
			    text indented almost to the right window border
			    occupying lot of vertical space when broken.
			    (default: 20)
		shift:{n}   After applying 'breakindent', the wrapped line's
			    beginning will be shifted by the given number of
			    characters.  It permits dynamic French paragraph
			    indentation (negative) or emphasizing the line
			    continuation (positive).
			    (default: 0)
		sbr	    Display the 'showbreak' value before applying the
			    additional indent.
			    (default: off)
		list:{n}    Adds an additional indent for lines that match a
			    numbered or bulleted list (using the
			    'formatlistpat' setting).
		list:-1	    Uses the length of a match with 'formatlistpat'
			    for indentation.
			    (default: 0)
		column:{n}  Indent at column {n}. Will overrule the other
			    sub-options. Note: an additional indent may be
			    added for the 'showbreak' setting.
			    (default: off)

						'browsedir' 'bsdir'
'browsedir' 'bsdir'	string	(default: "last")
			global
			{only for Motif, GTK, Mac and Win32 GUI}
	Which directory to use for the file browser:
	   last		Use same directory as with last file browser, where a
			file was opened or saved.
	   buffer	Use the directory of the related buffer.
	   current	Use the current directory.
	   {path}	Use the specified directory

						'bufhidden' 'bh'
'bufhidden' 'bh'	string (default: "")
			local to buffer  local-noglobal
	This option specifies what happens when a buffer is no longer
	displayed in a window:
	  <empty>	follow the global 'hidden' option
	  hide		hide the buffer (don't unload it), even if 'hidden' is
			not set
	  unload	unload the buffer, even if 'hidden' is set; the
			:hide command will also unload the buffer
	  delete	delete the buffer from the buffer list, even if
			'hidden' is set; the :hide command will also delete
			the buffer, making it behave like :bdelete
	  wipe		wipe the buffer from the buffer list, even if
			'hidden' is set; the :hide command will also wipe
			out the buffer, making it behave like :bwipeout

	CAREFUL: when "unload", "delete" or "wipe" is used changes in a buffer
	are lost without a warning.  Also, these values may break autocommands
	that switch between buffers temporarily.
	This option is used together with 'buftype' and 'swapfile' to specify
	special kinds of buffers.   See special-buffers.

			'buflisted' 'bl' 'nobuflisted' 'nobl' E85
'buflisted' 'bl'	boolean (default: on)
			local to buffer
	When this option is set, the buffer shows up in the buffer list.  If
	it is reset it is not used for ":bnext", "ls", the Buffers menu, etc.
	This option is reset by Vim for buffers that are only used to remember
	a file name or marks.  Vim sets it when starting to edit a buffer.
	But not when moving to a buffer with ":buffer".

						'buftype' 'bt' E382
'buftype' 'bt'		string (default: "")
			local to buffer  local-noglobal
	The value of this option specifies the type of a buffer:
	  <empty>	normal buffer
	  nofile	buffer which is not related to a file and will not be
			written
	  nowrite	buffer which will not be written
	  acwrite	buffer which will always be written with BufWriteCmd
			autocommands.
	  quickfix	quickfix buffer, contains list of errors :cwindow
			or list of locations :lwindow
	  help		help buffer (you are not supposed to set this
			manually)
	  terminal	buffer for a terminal (you are not supposed to set
			this manually)
	  prompt	buffer where only the last line can be edited, meant
			to be used by a plugin, see prompt-buffer
			{only when compiled with the |+channel| feature}
	  popup		buffer used in a popup window, see popup.
			{only when compiled with the |+textprop| feature}

	This option is used together with 'bufhidden' and 'swapfile' to
	specify special kinds of buffers.   See special-buffers.
	Also see win_gettype(), which returns the type of the window.

	Be careful with changing this option, it can have many side effects!
	One such effect is that Vim will not check the timestamp of the file,
	if the file is changed by another program this will not be noticed.

	A "quickfix" buffer is only used for the error list and the location
	list.  This value is set by the :cwindow and :lwindow commands and
	you are not supposed to change it.

	"nofile" and "nowrite" buffers are similar:
	both:		The buffer is not to be written to disk, ":w" doesn't
			work (":w filename" does work though).
	both:		The buffer is never considered to be 'modified'.
			There is no warning when the changes will be lost, for
			example when you quit Vim.
	both:		A swap file is only created when using too much memory
			(when 'swapfile' has been reset there is never a swap
			file).
	nofile only:	The buffer name is fixed, it is not handled like a
			file name.  It is not modified in response to a :cd
			command.
	both:		When using ":e bufname" and already editing "bufname"
			the buffer is made empty and autocommands are
			triggered as usual for :edit.
							E676
	"acwrite" implies that the buffer name is not related to a file, like
	"nofile", but it will be written.  Thus, in contrast to "nofile" and
	"nowrite", ":w" does work and a modified buffer can't be abandoned
	without saving.  For writing there must be matching BufWriteCmd,
	FileWriteCmd or FileAppendCmd autocommands.

						'casemap' 'cmp'
'casemap' 'cmp'		string	(default: "internal,keepascii")
			global
	Specifies details about changing the case of letters.  It may contain
	these words, separated by a comma:
	internal	Use internal case mapping functions, the current
			locale does not change the case mapping.  This only
			matters when 'encoding' is a Unicode encoding,
			"latin1" or "iso-8859-15".  When "internal" is
			omitted, the towupper() and towlower() system library
			functions are used when available.
	keepascii	For the ASCII characters (0x00 to 0x7f) use the US
			case mapping, the current locale is not effective.
			This probably only matters for Turkish.

				'cdhome' 'cdh' 'nocdhome' 'nocdh'
'cdhome' 'cdh'		boolean	(default: off)
			global
	When on, :cd, :tcd and :lcd without an argument changes the
	current working directory to the $HOME directory like in Unix.
	When off, those commands just print the current directory name.
	On Unix this option has no effect.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.
	NOTE: This option is reset when 'compatible' is set.

						'cdpath' 'cd' E344 E346
'cdpath' 'cd'		string	(default: equivalent to $CDPATH or ",,")
			global
	This is a list of directories which will be searched when using the
	:cd, :tcd and :lcd commands, provided that the directory being
	searched for has a relative path, not an absolute part starting with
	"/", "./" or "../", the 'cdpath' option is not used then.
	The 'cdpath' option's value has the same form and semantics as
	'path'.  Also see file-searching.
	The default value is taken from $CDPATH, with a "," prepended to look
	in the current directory first.
	If the default value taken from $CDPATH is not what you want, include
	a modified version of the following command in your vimrc file to
	override it: 
	  :let &cdpath = ',' .. substitute(substitute($CDPATH, '[, ]', '\\\0', 'g'), ':', ',', 'g')
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.
	(parts of 'cdpath' can be passed to the shell to expand file names).

						'cedit'
'cedit'			string	(Vi default: "", Vim default: CTRL-F)
			global
	The key used in Command-line Mode to open the command-line window.
	The default is CTRL-F when 'compatible' is off.
	Only non-printable keys are allowed.
	The key can be specified as a single character, but it is difficult to
	type.  The preferred way is to use the <> notation.  Examples: 
		:exe "set cedit=\<C-Y>"
		:exe "set cedit=\<Esc>"
	Nvi also has this option, but it only uses the first character.
	See cmdwin.
	NOTE: This option is set to the Vim default value when 'compatible'
	is reset.

				'charconvert' 'ccv' E202 E214 E513
'charconvert' 'ccv'	string (default "")
			global
			{only available when compiled with the |+eval| feature}
	An expression that is used for character encoding conversion.  It is
	evaluated when a file that is to be read or has been written has a
	different encoding from what is desired.
	'charconvert' is not used when the internal iconv() function is
	supported and is able to do the conversion.  Using iconv() is
	preferred, because it is much faster.
	'charconvert' is not used when reading stdin --, because there is no
	file to convert from.  You will have to save the text in a file first.
	The expression must return zero, false or an empty string for success,
	non-zero or true for failure.
	The possible encoding names encountered are in 'encoding'.
	Additionally, names given in 'fileencodings' and 'fileencoding' are
	used.
	Conversion between "latin1", "unicode", "ucs-2", "ucs-4" and "utf-8"
	is done internally by Vim, 'charconvert' is not used for this.
	'charconvert' is also used to convert the viminfo file, if the 'c'
	flag is present in 'viminfo'.  Also used for Unicode conversion.
	Example: 
		set charconvert=CharConvert()
		fun CharConvert()
		  system("recode "
			\ .. v:charconvert_from .. ".." .. v:charconvert_to
			\ .. " <" .. v:fname_in .. " >" .. v:fname_out)
		  return v:shell_error
		endfun
	The related Vim variables are:
		v:charconvert_from	name of the current encoding
		v:charconvert_to	name of the desired encoding
		v:fname_in		name of the input file
		v:fname_out		name of the output file
	Note that v:fname_in and v:fname_out will never be the same.
	Note that v:charconvert_from and v:charconvert_to may be different
	from 'encoding'.  Vim internally uses UTF-8 instead of UCS-2 or UCS-4.

	The advantage of using a function call without arguments is that it is
	faster, see expr-option-function.

	Encryption is not done by Vim when using 'charconvert'.  If you want
	to encrypt the file after conversion, 'charconvert' should take care
	of this.

	If the 'charconvert' expression starts with s: or <SID>, then it is
	replaced with the script ID (local-function). Example: 
		set charconvert=s:MyConvert()
		set charconvert=<SID>SomeConvert()
	Otherwise the expression is evaluated in the context of the script
	where the option was set, thus script-local items are available.

	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

				   'cindent' 'cin' 'nocindent' 'nocin'
'cindent' 'cin'		boolean	(default off)
			local to buffer
	Enables automatic C program indenting.  See 'cinkeys' to set the keys
	that trigger reindenting in insert mode and 'cinoptions' to set your
	preferred indent style.
	If 'indentexpr' is not empty, it overrules 'cindent'.
	If 'lisp' is not on and both 'indentexpr' and 'equalprg' are empty,
	the "=" operator indents using this algorithm rather than calling an
	external program.
	See C-indenting.
	When you don't like the way 'cindent' works, try the 'smartindent'
	option or 'indentexpr'.
	This option is not used when 'paste' is set.
	NOTE: This option is reset when 'compatible' is set.

							'cinkeys' 'cink'
'cinkeys' 'cink'	string	(default "0{,0},0),0],:,0#,!^F,o,O,e")
			local to buffer
	A list of keys that, when typed in Insert mode, cause reindenting of
	the current line.  Only used if 'cindent' is on and 'indentexpr' is
	empty.
	For the format of this option see cinkeys-format.
	See C-indenting.

						'cinoptions' 'cino'
'cinoptions' 'cino'	string	(default "")
			local to buffer
	The 'cinoptions' affect the way 'cindent' reindents lines in a C
	program.  See cinoptions-values for the values of this option, and
	C-indenting for info on C indenting in general.

						'cinscopedecls' 'cinsd'
'cinscopedecls' 'cinsd'	string	(default "public,protected,private")
			local to buffer
	Keywords that are interpreted as a C++ scope declaration by cino-g.
	Useful e.g. for working with the Qt framework that defines additional
	scope declarations "signals", "public slots" and "private slots": 
		set cinscopedecls+=signals,public\ slots,private\ slots

						'cinwords' 'cinw'
'cinwords' 'cinw'	string	(default "if,else,while,do,for,switch")
			local to buffer
	These keywords start an extra indent in the next line when
	'smartindent' or 'cindent' is set.  For 'cindent' this is only done at
	an appropriate place (inside {}).
	Note that 'ignorecase' isn't used for 'cinwords'.  If case doesn't
	matter, include the keyword both the uppercase and lowercase:
	"if,If,IF".

						'clipboard' 'cb'
'clipboard' 'cb'	string	(default "autoselect,exclude:cons\|linux"
						  for X-windows, "" otherwise)
			global
			{only in GUI versions or when the +xterm_clipboard
			feature is included}
	This option is a list of comma-separated names.
	Note: if one of the items is "exclude:", then you can't add an item
	after that.  Therefore do not append an item with += but use ^= to
	prepend, e.g.: 
		set clipboard^=unnamed
	When using the GUI see 'go-A'.
	These names are recognized:

						clipboard-unnamed
	unnamed		When included, Vim will use the clipboard register '*'
			for all yank, delete, change and put operations which
			would normally go to the unnamed register.  When a
			register is explicitly specified, it will always be
			used regardless of whether "unnamed" is in 'clipboard'
			or not.  The clipboard register can always be
			explicitly accessed using the "* notation.  Also see
			gui-clipboard.

						clipboard-unnamedplus
	unnamedplus	A variant of the "unnamed" flag which uses the
			clipboard register '+' (quoteplus) instead of
			register '*' for all yank, delete, change and put
			operations which would normally go to the unnamed
			register.  When "unnamed" is also included to the
			option, yank operations (but not delete, change or
			put) will additionally copy the text into register
			'*'.
			Only available with the +X11 feature.
			Availability can be checked with: 
				if has('unnamedplus')

						clipboard-autoselect
	autoselect	Works like the 'a' flag in 'guioptions': If present,
			then whenever Visual mode is started, or the Visual
			area extended, Vim tries to become the owner of the
			windowing system's global selection or put the
			selected text on the clipboard used by the selection
			register "*.  See 'go-a' and quotestar for details.
			When the GUI is active, the 'a' flag in 'guioptions'
			is used, when the GUI is not active, this "autoselect"
			flag is used.
			Also applies to the modeless selection.

						clipboard-autoselectplus
	autoselectplus  Like "autoselect" but using the + register instead of
			the * register.  Compare to the 'P' flag in
			'guioptions'.

						clipboard-autoselectml
	autoselectml	Like "autoselect", but for the modeless selection
			only.  Compare to the 'A' flag in 'guioptions'.

						clipboard-html
	html		When the clipboard contains HTML, use this when
			pasting.  When putting text on the clipboard, mark it
			as HTML.  This works to copy rendered HTML from
			Firefox, paste it as raw HTML in Vim, select the HTML
			in Vim and paste it in a rich edit box in Firefox.
			You probably want to add this only temporarily,
			possibly use BufEnter autocommands.
			Only supported for GTK version 2 and later.

						clipboard-exclude
	exclude:{pattern}
			Defines a pattern that is matched against the name of
			the terminal 'term'.  If there is a match, no
			connection will be made to the X server.  This is
			useful in this situation:
			- Running Vim in a console.
			- $DISPLAY is set to start applications on another
			  display.
			- You do not want to connect to the X server in the
			  console, but do want this in a terminal emulator.
			To never connect to the X server use: 
				exclude:.*
			This has the same effect as using the -X argument.
			Note that when there is no connection to the X server
			the window title won't be restored and the clipboard
			cannot be accessed.
			The value of 'magic' is ignored, {pattern} is
			interpreted as if 'magic' was on.
			The rest of the option value will be used for
			{pattern}, this must be the last entry.

						'cmdheight' 'ch'
'cmdheight' 'ch'	number	(default 1)
			global or local to tab page
	Number of screen lines to use for the command-line.  A larger value
	helps avoiding hit-enter prompts.
	The value of this option is stored with the tab page, so that each tab
	page can have a different value.

						'cmdwinheight' 'cwh'
'cmdwinheight' 'cwh'	number	(default 7)
			global
	Number of screen lines to use for the command-line window. cmdwin

						'colorcolumn' 'cc'
'colorcolumn' 'cc'	string	(default "")
			local to window
			{not available when compiled without the +syntax
			feature}
	'colorcolumn' is a comma-separated list of screen columns that are
	highlighted with ColorColumn hl-ColorColumn.  Useful to align
	text.  Will make screen redrawing slower.
	The screen column can be an absolute number, or a number preceded with
	'+' or '-', which is added to or subtracted from 'textwidth'. 

		:set cc=+1	  " highlight column after 'textwidth'
		:set cc=+1,+2,+3  " highlight three columns after 'textwidth'
		:hi ColorColumn ctermbg=lightgrey guibg=lightgrey

	When 'textwidth' is zero then the items with '-' and '+' are not used.
	A maximum of 256 columns are highlighted.

						'columns' 'co' E594
'columns' 'co'		number	(default 80 or terminal width)
			global
	Number of columns of the screen.  Normally this is set by the terminal
	initialization and does not have to be set by hand.  Also see
	posix-screen-size.
	When Vim is running in the GUI or in a resizable window, setting this
	option will cause the window size to be changed.  When you only want
	to use the size for the GUI, put the command in your gvimrc file.
	When you set this option and Vim is unable to change the physical
	number of columns of the display, the display may be messed up.  For
	the GUI it is always possible and Vim limits the number of columns to
	what fits on the screen.  You can use this command to get the widest
	window possible: 
		:set columns=9999
	Minimum value is 12, maximum value is 10000.

						'columnspace' 'csp'
'columnspace' 'csp'	number	(default 0)
			global
			{not in Vi}
			{only in the MacVim GUI}
	Number of pixel columns inserted between characters.  With some fonts
  there can be too much room between characters.  Then it makes sense
  to set 'columnspace' to a negative value.  This may cause display
  problems though!

					'comments' 'com' E524 E525
'comments' 'com'	string	(default
				"s1:/*,mb:*,ex:*/,://,b:#,:%,:XCOMM,n:>,fb:-")
			local to buffer
	A comma-separated list of strings that can start a comment line.  See
	format-comments.  See option-backslash about using backslashes to
	insert a space.

					'commentstring' 'cms' E537
'commentstring' 'cms'	string	(default "/*%s*/")
			local to buffer
			{not available when compiled without the +folding
			feature}
	A template for a comment.  The "%s" in the value is replaced with the
	comment text.  Currently only used to add markers for folding, see
	fold-marker.

			'compatible' 'cp' 'nocompatible' 'nocp'
'compatible' 'cp'	boolean	(default on, off when a vimrc or gvimrc
					file is found, reset in defaults.vim)
			global
	This option has the effect of making Vim either more Vi-compatible, or
	make Vim behave in a more useful way.

	This is a special kind of option, because when it's set or reset,
	other options are also changed as a side effect.
	NOTE: Setting or resetting this option can have a lot of unexpected
	effects: Mappings are interpreted in another way, undo behaves
	differently, etc.  If you set this option in your vimrc file, you
	should probably put it at the very start.

	By default this option is on and the Vi defaults are used for the
	options.  This default was chosen for those people who want to use Vim
	just like Vi, and don't even (want to) know about the 'compatible'
	option.
	When a vimrc or gvimrc file is found while Vim is starting up,
	this option is switched off, and all options that have not been
	modified will be set to the Vim defaults.  Effectively, this means
	that when a vimrc or gvimrc file exists, Vim will use the Vim
	defaults, otherwise it will use the Vi defaults.  (Note: This doesn't
	happen for the system-wide vimrc or gvimrc file, nor for a file given
	with the -u argument).  Also see compatible-default and
	posix-compliance.
	You can also set this option with the "-C" argument, and reset it with
	"-N".  See -C and -N.
	See 'cpoptions' for more fine tuning of Vi compatibility.

	When this option is set, numerous other options are set to make Vim as
	Vi-compatible as possible.  When this option is unset, various options
	are set to make Vim more useful.  The table below lists all the
	options affected.
	The {?} column indicates when the options are affected:
	+  Means that the option is set to the value given in {set value} when
	   'compatible' is set.
	&  Means that the option is set to the value given in {set value} when
	   'compatible' is set AND is set to its Vim default value when
	   'compatible' is unset.
	-  Means the option is NOT changed when setting 'compatible' but IS
	   set to its Vim default when 'compatible' is unset.
	The {effect} column summarises the change when 'compatible' is set.

	option		? set value	effect 

	'allowrevins'	+ off		no CTRL-_ command
	'antialias'	+ off		don't use antialiased fonts
	'arabic'	+ off		reset arabic-related options
	'arabicshape'	+ on		correct character shapes
	'backspace'	+ ""		normal backspace
	'backup'	+ off		no backup file
	'backupcopy'	& Unix: "yes"	backup file is a copy
			  else: "auto"	copy or rename backup file
	'balloonexpr'	+ ""		text to show in evaluation balloon
	'breakindent'	+ off		don't indent when wrapping lines
	'cedit'		- {unchanged}	{set vim default only on resetting 'cp'}
	'cdhome'	+ off		":cd" don't chdir to home on non-Unix
	'cindent'	+ off		no C code indentation
	'compatible'	- {unchanged}	{set vim default only on resetting 'cp'}
	'copyindent'	+ off		don't copy indent structure
	'cpoptions'	& (all flags)	Vi-compatible flags
	'cscopepathcomp'+ 0		don't show directories in tags list
	'cscoperelative'+ off		don't use basename of path as prefix
	'cscopetag'	+ off		don't use cscope for ":tag"
	'cscopetagorder'+ 0		see cscopetagorder
	'cscopeverbose'	+ off		see cscopeverbose
	'delcombine'	+ off		unicode: delete whole char combination
	'digraph'	+ off		no digraphs
	'esckeys'	& off		no <Esc>-keys in Insert mode
					this also disables modifyOtherKeys
					and xterm-bracketed-paste
	'expandtab'	+ off		tabs not expanded to spaces
	'fileformats'	& ""		no automatic file format detection,
			  "dos,unix"	except for MS-Windows
	'formatexpr'	+ ""		use 'formatprg' for auto-formatting
	'formatoptions'	& "vt"		Vi compatible formatting
	'gdefault'	+ off		no default 'g' flag for ":s"
	'history'	& 0		no commandline history
	'hkmap'		+ off		no Hebrew keyboard mapping
	'hkmapp'	+ off		no phonetic Hebrew keyboard mapping
	'hlsearch'	+ off		no highlighting of search matches
	'incsearch'	+ off		no incremental searching
	'indentexpr'	+ ""		no indenting by expression
	'insertmode'	+ off		do not start in Insert mode
	'iskeyword'	& "@,48-57,_"	keywords contain alphanumeric
						characters and '_'
	'joinspaces'	+ on		insert 2 spaces after period
	'modeline'	& off		no modelines
	'more'		& off		no pauses in listings
	'mzquantum'	- {unchanged}	{set vim default only on resetting 'cp'}
	'numberwidth'	& 8		min number of columns for line number
	'preserveindent'+ off		don't preserve current indent structure
						when changing it
	'revins'	+ off		no reverse insert
	'ruler'		+ off		no ruler
	'scrolljump'	+ 1		no jump scroll
	'scrolloff'	+ 0		no scroll offset
	'shelltemp'	- {unchanged}	{set vim default only on resetting 'cp'}
	'shiftround'	+ off		indent not rounded to shiftwidth
	'shortmess'	& "S"		no shortening of messages
	'showcmd'	& off		command characters not shown
	'showmode'	& off		current mode not shown
	'sidescrolloff'	+ 0		cursor moves to edge of screen in scroll
	'smartcase'	+ off		no automatic ignore case switch
	'smartindent'	+ off		no smart indentation
	'smarttab'	+ off		no smart tab size
	'softtabstop'	+ 0		tabs are always 'tabstop' positions
	'startofline'	+ on		goto startofline with some commands
	'tagcase'	& "followic"	'ignorecase' when searching tags file
	'tagrelative'	& off		tag file names are not relative
	'termguicolors'	+ off		don't use highlight-(guifg|guibg)
	'textauto'	& off		no automatic textmode detection
	'textwidth'	+ 0		no automatic line wrap
	'tildeop'	+ off		tilde is not an operator
	'ttimeout'	+ off		no terminal timeout
	'undofile'	+ off		don't use an undo file
	'viminfo'       - {unchanged}	{set Vim default only on resetting 'cp'}
	'virtualedit'	+ ""		cursor can only be placed on characters
	'whichwrap'	& ""		left-right movements don't wrap
	'wildchar'	& CTRL-E	only when the current value is <Tab>
					use CTRL-E for cmdline completion
	'writebackup'	+ on or off	depends on the +writebackup feature

						'complete' 'cpt' E535
'complete' 'cpt'	string	(default: ".,w,b,u,t,i")
			local to buffer
	This option specifies how keyword completion ins-completion works
	when CTRL-P or CTRL-N are used.  It is also used for whole-line
	completion i_CTRL-X_CTRL-L.  It indicates the type of completion
	and the places to scan.  It is a comma-separated list of flags:
	.	scan the current buffer ('wrapscan' is ignored)
	w	scan buffers from other windows
	b	scan other loaded buffers that are in the buffer list
	u	scan the unloaded buffers that are in the buffer list
	U	scan the buffers that are not in the buffer list
	k	scan the files given with the 'dictionary' option
	kspell  use the currently active spell checking spell
	k{dict}	scan the file {dict}.  Several "k" flags can be given,
		patterns are valid too.  For example: 
			:set cpt=k/usr/dict/*,k~/spanish
	s	scan the files given with the 'thesaurus' option
	s{tsr}	scan the file {tsr}.  Several "s" flags can be given, patterns
		are valid too.
	i	scan current and included files
	d	scan current and included files for defined name or macro
		i_CTRL-X_CTRL-D
	]	tag completion
	t	same as "]"

	Unloaded buffers are not loaded, thus their autocmds :autocmd are
	not executed, this may lead to unexpected completions from some files
	(gzipped files for example).  Unloaded buffers are not scanned for
	whole-line completion.

	The default is ".,w,b,u,t,i", which means to scan:
	   1. the current buffer
	   2. buffers in other windows
	   3. other loaded buffers
	   4. unloaded buffers
	   5. tags
	   6. included files

	As you can see, CTRL-N and CTRL-P can be used to do any 'iskeyword'-
	based expansion (e.g., dictionary i_CTRL-X_CTRL-K, included patterns
	i_CTRL-X_CTRL-I, tags i_CTRL-X_CTRL-] and normal expansions).

						'completefunc' 'cfu'
'completefunc' 'cfu'	string	(default: empty)
			local to buffer
			{not available when compiled without the +eval
			feature}
	This option specifies a function to be used for Insert mode completion
	with CTRL-X CTRL-U. i_CTRL-X_CTRL-U
	See complete-functions for an explanation of how the function is
	invoked and what it should return.  The value can be the name of a
	function, a lambda or a Funcref. See option-value-function for
	more information.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'completeopt' 'cot'
'completeopt' 'cot'	string	(default: "menu,preview")
			global
	A comma-separated list of options for Insert mode completion
	ins-completion.  The supported values are:

	   menu	    Use a popup menu to show the possible completions.  The
		    menu is only shown when there is more than one match and
		    sufficient colors are available.  ins-completion-menu

	   menuone  Use the popup menu also when there is only one match.
		    Useful when there is additional information about the
		    match, e.g., what file it comes from.

	   longest  Only insert the longest common text of the matches.  If
		    the menu is displayed you can use CTRL-L to add more
		    characters.  Whether case is ignored depends on the kind
		    of completion.  For buffer text the 'ignorecase' option is
		    used.

	   preview  Show extra information about the currently selected
		    completion in the preview window.  Only works in
		    combination with "menu" or "menuone".

	   popup    Show extra information about the currently selected
		    completion in a popup window.  Only works in combination
		    with "menu" or "menuone".  Overrides "preview".
		    See 'completepopup' for specifying properties.
		    {only works when compiled with the |+textprop| feature}

	   popuphidden
		    Just like "popup" but initially hide the popup.  Use a
		    CompleteChanged autocommand to fetch the info and call
		    popup_show() once the popup has been filled.
		    See the example at complete-popuphidden.
		    {only works when compiled with the |+textprop| feature}

	   noinsert Do not insert any text for a match until the user selects
		    a match from the menu. Only works in combination with
		    "menu" or "menuone". No effect if "longest" is present.

	   noselect Do not select a match in the menu, force the user to
		    select one from the menu. Only works in combination with
		    "menu" or "menuone".

					'completepopup' 'cpp'
'completepopup' 'cpp'	string (default empty)
			global
			{not available when compiled without the +textprop
			or +quickfix feature}
	When 'completeopt' contains "popup" then this option is used for the
	properties of the info popup when it is created.  If an info popup
	window already exists it is closed, so that the option value is
	applied when it is created again.
	You can also use popup_findinfo() and then set properties for an
	existing info popup with popup_setoptions().  See complete-popup.

						'completeslash' 'csl'
'completeslash' 'csl'	string	(default: "")
			local to buffer
			{only for MS-Windows}
	When this option is set it overrules 'shellslash' for completion:
	- When this option is set to "slash", a forward slash is used for path
	  completion in insert mode. This is useful when editing HTML tag, or
	  Makefile with 'noshellslash' on MS-Windows.
	- When this option is set to "backslash", backslash is used. This is
	  useful when editing a batch file with 'shellslash' set on MS-Windows.
	- When this option is empty, same character is used as for
	  'shellslash'.
	For Insert mode completion the buffer-local value is used.  For
	command line completion the global value is used.

						'concealcursor' 'cocu'
'concealcursor' 'cocu'	string (default: "")
			local to window
			{not available when compiled without the +conceal
			feature}
	Sets the modes in which text in the cursor line can also be concealed.
	When the current mode is listed then concealing happens just like in
	other lines.
	  n		Normal mode
	  v		Visual mode
	  i		Insert mode
	  c		Command line editing, for 'incsearch'

	'v' applies to all lines in the Visual area, not only the cursor.
	A useful value is "nc".  This is used in help files.  So long as you
	are moving around text is concealed, but when starting to insert text
	or selecting a Visual area the concealed text is displayed, so that
	you can see what you are doing.
	Keep in mind that the cursor position is not always where it's
	displayed.  E.g., when moving vertically it may change column.

						'conceallevel' 'cole'
'conceallevel' 'cole'	number (default 0)
			local to window
			{not available when compiled without the +conceal
			feature}
	Determine how text with the "conceal" syntax attribute :syn-conceal
	is shown:

	Value		Effect 
	0		Text is shown normally
	1		Each block of concealed text is replaced with one
			character.  If the syntax item does not have a custom
			replacement character defined (see :syn-cchar) the
			character defined in 'listchars' is used (default is a
			space).
			It is highlighted with the "Conceal" highlight group.
	2		Concealed text is completely hidden unless it has a
			custom replacement character defined (see
			:syn-cchar).
	3		Concealed text is completely hidden.

	Note: in the cursor line concealed text is not hidden, so that you can
	edit and copy the text.  This can be changed with the 'concealcursor'
	option.

				'confirm' 'cf' 'noconfirm' 'nocf'
'confirm' 'cf'		boolean (default off)
			global
	When 'confirm' is on, certain operations that would normally
	fail because of unsaved changes to a buffer, e.g. ":q" and ":e",
	instead raise a dialog asking if you wish to save the current
	file(s).  You can still use a ! to unconditionally abandon a buffer.
	If 'confirm' is off you can still activate confirmation for one
	command only (this is most useful in mappings) with the :confirm
	command.
	Also see the confirm() function and the 'v' flag in 'guioptions'.

			'conskey' 'consk' 'noconskey' 'noconsk'
'conskey' 'consk'	boolean	(default off)
			global
	This was for MS-DOS and is no longer supported.

			'copyindent' 'ci' 'nocopyindent' 'noci'
'copyindent' 'ci'	boolean	(default off)
			local to buffer
	Copy the structure of the existing lines indent when autoindenting a
	new line.  Normally the new indent is reconstructed by a series of
	tabs followed by spaces as required (unless 'expandtab' is enabled,
	in which case only spaces are used).  Enabling this option makes the
	new line copy whatever characters were used for indenting on the
	existing line.  'expandtab' has no effect on these characters, a Tab
	remains a Tab.  If the new indent is greater than on the existing
	line, the remaining space is filled in the normal manner.
	NOTE: This option is reset when 'compatible' is set.
	Also see 'preserveindent'.

						'cpoptions' 'cpo' cpo
'cpoptions' 'cpo'	string	(Vim default: "aABceFs",
				 Vi default:  all flags)
			global
	A sequence of single character flags.  When a character is present
	this indicates Vi-compatible behavior.  This is used for things where
	not being Vi-compatible is mostly or sometimes preferred.
	'cpoptions' stands for "compatible-options".
	Commas can be added for readability.
	To avoid problems with flags that are added in the future, use the
	"+=" and "-=" feature of ":set" add-option-flags.

	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

	NOTE: In a Vim9 script, when vim9script is encountered, the value
	is saved, 'cpoptions' is set to the Vim default, and the saved value
	is restored at the end of the script.  Changes to the value of
	'cpoptions' will be applied to the saved value, but keep in mind that
	removing a flag that is not present when 'cpoptions' is changed has no
	effect.  In the .vimrc file the value is not restored, thus using
	vim9script in the .vimrc file results in using the Vim default.

	NOTE: This option is set to the POSIX default value at startup when
	the Vi default value would be used and the $VIM_POSIX environment
	variable exists posix.  This means Vim tries to behave like the
	POSIX specification.

	    contains	behavior	
								cpo-a
		a	When included, a ":read" command with a file name
			argument will set the alternate file name for the
			current window.
								cpo-A
		A	When included, a ":write" command with a file name
			argument will set the alternate file name for the
			current window.
								cpo-b
		b	"\|" in a ":map" command is recognized as the end of
			the map command.  The '\' is included in the mapping,
			the text after the '|' is interpreted as the next
			command.  Use a CTRL-V instead of a backslash to
			include the '|' in the mapping.  Applies to all
			mapping, abbreviation, menu and autocmd commands.
			See also map_bar.
								cpo-B
		B	A backslash has no special meaning in mappings,
			abbreviations, user commands and the "to" part of the
			menu commands.  Remove this flag to be able to use a
			backslash like a CTRL-V.  For example, the command
			":map X \<Esc>" results in X being mapped to:
				'B' included:	"\^["	 (^[ is a real <Esc>)
				'B' excluded:	"<Esc>"  (5 characters)
				('<' excluded in both cases)
								cpo-c
		c	Searching continues at the end of any match at the
			cursor position, but not further than the start of the
			next line.  When not present searching continues
			one character from the cursor position.  With 'c'
			"abababababab" only gets three matches when repeating
			"/abab", without 'c' there are five matches.
								cpo-C
		C	Do not concatenate sourced lines that start with a
			backslash.  See line-continuation.
								cpo-d
		d	Using "./" in the 'tags' option doesn't mean to use
			the tags file relative to the current file, but the
			tags file in the current directory.
								cpo-D
		D	Can't use CTRL-K to enter a digraph after Normal mode
			commands with a character argument, like r, f and
			t.
								cpo-e
		e	When executing a register with ":@r", always add a
			<CR> to the last line, also when the register is not
			linewise.  If this flag is not present, the register
			is not linewise and the last line does not end in a
			<CR>, then the last line is put on the command-line
			and can be edited before hitting <CR>.
								cpo-E
		E	It is an error when using "y", "d", "c", "g~", "gu" or
			"gU" on an Empty region.  The operators only work when
			at least one character is to be operated on.  Example:
			This makes "y0" fail in the first column.
								cpo-f
		f	When included, a ":read" command with a file name
			argument will set the file name for the current buffer,
			if the current buffer doesn't have a file name yet.
								cpo-F
		F	When included, a ":write" command with a file name
			argument will set the file name for the current
			buffer, if the current buffer doesn't have a file name
			yet.  Also see cpo-P.
								cpo-g
		g	Goto line 1 when using ":edit" without argument.
								cpo-H
		H	When using "I" on a line with only blanks, insert
			before the last blank.  Without this flag insert after
			the last blank.
								cpo-i
		i	When included, interrupting the reading of a file will
			leave it modified.
								cpo-I
		I	When moving the cursor up or down just after inserting
			indent for 'autoindent', do not delete the indent.
								cpo-j
		j	When joining lines, only add two spaces after a '.',
			not after '!' or '?'.  Also see 'joinspaces'.
								cpo-J
		J	A sentence has to be followed by two spaces after
			the '.', '!' or '?'.  A <Tab> is not recognized as
			white space.
								cpo-k
		k	Disable the recognition of raw key codes in
			mappings, abbreviations, and the "to" part of menu
			commands.  For example, if <Key> sends ^[OA (where ^[
			is <Esc>), the command ":map X ^[OA" results in X
			being mapped to:
				'k' included:	"^[OA"	 (3 characters)
				'k' excluded:	"<Key>"  (one key code)
			Also see the '<' flag below.
								cpo-K
		K	Don't wait for a key code to complete when it is
			halfway a mapping.  This breaks mapping <F1><F1> when
			only part of the second <F1> has been read.  It
			enables cancelling the mapping by typing <F1><Esc>.
								cpo-l
		l	Backslash in a [] range in a search pattern is taken
			literally, only "\]", "\^", "\-" and "\\" are special.
			See /[]
			   'l' included: "/[ \t]"  finds <Space>, '\' and 't'
			   'l' excluded: "/[ \t]"  finds <Space> and <Tab>
			Also see cpo-\.
								cpo-L
		L	When the 'list' option is set, 'wrapmargin',
			'textwidth', 'softtabstop' and Virtual Replace mode
			(see gR) count a <Tab> as two characters, instead of
			the normal behavior of a <Tab>.
								cpo-m
		m	When included, a showmatch will always wait half a
			second.  When not included, a showmatch will wait half
			a second or until a character is typed.  'showmatch'
								cpo-M
		M	When excluded, "%" matching will take backslashes into
			account.  Thus in "( \( )" and "\( ( \)" the outer
			parenthesis match.  When included "%" ignores
			backslashes, which is Vi compatible.
								cpo-n
		n	When included, the column used for 'number' and
			'relativenumber' will also be used for text of wrapped
			lines.
								cpo-o
		o	Line offset to search command is not remembered for
			next search.
								cpo-O
		O	Don't complain if a file is being overwritten, even
			when it didn't exist when editing it.  This is a
			protection against a file unexpectedly created by
			someone else.  Vi didn't complain about this.
								cpo-p
		p	Vi compatible Lisp indenting.  When not present, a
			slightly better algorithm is used.
								cpo-P
		P	When included, a ":write" command that appends to a
			file will set the file name for the current buffer, if
			the current buffer doesn't have a file name yet and
			the 'F' flag is also included cpo-F.
								cpo-q
		q	When joining multiple lines leave the cursor at the
			position where it would be when joining two lines.
								cpo-r
		r	Redo ("." command) uses "/" to repeat a search
			command, instead of the actually used search string.
								cpo-R
		R	Remove marks from filtered lines.  Without this flag
			marks are kept like :keepmarks was used.
								cpo-s
		s	Set buffer options when entering the buffer for the
			first time.  This is like it is in Vim version 3.0.
			And it is the default.  If not present the options are
			set when the buffer is created.
								cpo-S
		S	Set buffer options always when entering a buffer
			(except 'readonly', 'fileformat', 'filetype' and
			'syntax').  This is the (most) Vi compatible setting.
			The options are set to the values in the current
			buffer.  When you change an option and go to another
			buffer, the value is copied.  Effectively makes the
			buffer options global to all buffers.

			's'    'S'     copy buffer options
			no     no      when buffer created
			yes    no      when buffer first entered (default)
			 X     yes     each time when buffer entered (vi comp.)
								cpo-t
		t	Search pattern for the tag command is remembered for
			"n" command.  Otherwise Vim only puts the pattern in
			the history for search pattern, but doesn't change the
			last used search pattern.
								cpo-u
		u	Undo is Vi compatible.  See undo-two-ways.
								cpo-v
		v	Backspaced characters remain visible on the screen in
			Insert mode.  Without this flag the characters are
			erased from the screen right away.  With this flag the
			screen newly typed text overwrites backspaced
			characters.
								cpo-w
		w	When using "cw" on a blank character, only change one
			character and not all blanks until the start of the
			next word.
								cpo-W
		W	Don't overwrite a readonly file.  When omitted, ":w!"
			overwrites a readonly file, if possible.
								cpo-x
		x	<Esc> on the command-line executes the command-line.
			The default in Vim is to abandon the command-line,
			because <Esc> normally aborts a command.  c_<Esc>
								cpo-X
		X	When using a count with "R" the replaced text is
			deleted only once.  Also when repeating "R" with "."
			and a count.
								cpo-y
		y	A yank command can be redone with ".".  Think twice if
			you really want to use this, it may break some
			plugins, since most people expect "." to only repeat a
			change.
								cpo-Z
		Z	When using "w!" while the 'readonly' option is set,
			don't reset 'readonly'.
								cpo-!
		!	When redoing a filter command, use the last used
			external command, whatever it was.  Otherwise the last
			used -filter- command is used.
								cpo-$
		$	When making a change to one line, don't redisplay the
			line, but put a '$' at the end of the changed text.
			The changed text will be overwritten when you type the
			new text.  The line is redisplayed if you type any
			command that moves the cursor from the insertion
			point.
								cpo-%
		%	Vi-compatible matching is done for the "%" command.
			Does not recognize "#if", "#endif", etc.
			Does not recognize "/*" and "*/".
			Parens inside single and double quotes are also
			counted, causing a string that contains a paren to
			disturb the matching.  For example, in a line like
			"if (strcmp("foo(", s))" the first paren does not
			match the last one.  When this flag is not included,
			parens inside single and double quotes are treated
			specially.  When matching a paren outside of quotes,
			everything inside quotes is ignored.  When matching a
			paren inside quotes, it will find the matching one (if
			there is one).  This works very well for C programs.
			This flag is also used for other features, such as
			C-indenting.
								cpo--
		-	When included, a vertical movement command fails when
			it would go above the first line or below the last
			line.  Without it the cursor moves to the first or
			last line, unless it already was in that line.
			Applies to the commands "-", "k", CTRL-P, "+", "j",
			CTRL-N, CTRL-J and ":1234".
								cpo-+
		+	When included, a ":write file" command will reset the
			'modified' flag of the buffer, even though the buffer
			itself may still be different from its file.
								cpo-star
		*	Use ":*" in the same way as ":@".  When not included,
			":*" is an alias for ":'<,'>", select the Visual area.
								cpo-<
		<	Disable the recognition of special key codes in <>
			form in mappings, abbreviations, and the "to" part of
			menu commands.  For example, the command
			":map X <Tab>" results in X being mapped to:
				'<' included:	"<Tab>"  (5 characters)
				'<' excluded:	"^I"	 (^I is a real <Tab>)
			Also see the 'k' flag above.
								cpo->
		>	When appending to a register, put a line break before
			the appended text.
								cpo-;
		;	When using , or ; to repeat the last t search
			and the cursor is right in front of the searched
			character, the cursor won't move. When not included,
			the cursor would skip over it and jump to the
			following occurrence.

	POSIX flags.  These are not included in the Vi default value, except
	when $VIM_POSIX was set on startup. posix

	    contains	behavior	
								cpo-#
		#	A count before "D", "o" and "O" has no effect.
								cpo-&
		&	When ":preserve" was used keep the swap file when
			exiting normally while this buffer is still loaded.
			This flag is tested when exiting.
								cpo-\
		\	Backslash in a [] range in a search pattern is taken
			literally, only "\]" is special  See /[]
			   '\' included: "/[ \-]"  finds <Space>, '\' and '-'
			   '\' excluded: "/[ \-]"  finds <Space> and '-'
			Also see cpo-l.
								cpo-/
		/	When "%" is used as the replacement string in a :s
			command, use the previous replacement string. :s%
								cpo-{
		{	The |{| and |}| commands also stop at a "{" character
			at the start of a line.
								cpo-.
		.	The ":chdir" and ":cd" commands fail if the current
			buffer is modified, unless ! is used.  Vim doesn't
			need this, since it remembers the full path of an
			opened file.
								cpo-bar
		|	The value of the $LINES and $COLUMNS environment
			variables overrule the terminal size values obtained
			with system specific functions.

						'cryptmethod' 'cm'
'cryptmethod' 'cm'	string	(default "blowfish2")
			global or local to buffer global-local
	Method used for encryption when the buffer is written to a file:
							pkzip
	   zip		PkZip compatible method.  A weak kind of encryption.
			Backwards compatible with Vim 7.2 and older.
			Only use if you need to be backwards compatible.
							blowfish
	   blowfish	Blowfish method.  Medium strong encryption but it has
			an implementation flaw.  Requires Vim 7.3 or later,
			files can NOT be read by Vim 7.2 and older.  This adds
			a "seed" to the file, every time you write the file
			the encrypted bytes will be different.
			Obsolete, please do no longer use.
							blowfish2
	   blowfish2	Blowfish method.  Medium strong encryption.  Requires
			Vim 7.4.401 or later, files can NOT be read by Vim 7.3
			and older.  This adds a "seed" to the file, every time
			you write the file the encrypted bytes will be
			different.  The whole undo file is encrypted, not just
			the pieces of text.
					E1193 E1194 E1195 E1196 E1230
					E1197 E1198 E1199 E1200 E1201
	   xchacha20	XChaCha20 Cipher with Poly1305 Message Authentication
			Code.  Medium strong till strong encryption.
			Encryption is provided by the libsodium library, it
			requires Vim to be built with +sodium.
			It adds a seed and a message authentication code (MAC)
			to the file.  This needs at least a Vim 8.2.3022 to
			read the encrypted file.
			Encryption of swap files is not supported, therefore
			no swap file will be used when xchacha20 encryption is
			enabled.
			Encryption of undo files is not yet supported,
			therefore no undo file will currently be written.
			CAREFUL: Files written with this method might have to
			be read back with the same version of Vim if the
			binary format changes later.
			Obsolete, please do no longer use.
	   xchacha20v2  Same algorithm as with "xchacha20" that correctly
			stores the key derivation parameters together with the
			encrypted file.  Should work better in case the
			parameters in the libsodium library ever change.
			STILL EXPERIMENTAL: Files written with this method
			might have to be read back with the same version of
			Vim if the binary format changes later.

	You should use "blowfish2", also to re-encrypt older files.  The
	"xchacha20" method provides better encryption, but it does not work
	with all versions of Vim.

	When reading an encrypted file 'cryptmethod' will be set automatically
	to the detected method of the file being read.  Thus if you write it
	without changing 'cryptmethod' the same method will be used.
	Changing 'cryptmethod' does not mark the file as modified, you have to
	explicitly write it, you don't get a warning unless there are other
	modifications.  Also see :X.

	When setting the global value to an empty string, it will end up with
	the value "blowfish2".  When setting the local value to an empty
	string the buffer will use the global value.

	When a new encryption method is added in a later version of Vim, and
	the current version does not recognize it, you will get	E821 .
	You need to edit this file with the later version of Vim.

						'cscopepathcomp' 'cspc'
'cscopepathcomp' 'cspc'	number	(default 0)
			global
			{not available when compiled without the +cscope
			feature}
	Determines how many components of the path to show in a list of tags.
	See cscopepathcomp.
	NOTE: This option is set to 0 when 'compatible' is set.

						'cscopeprg' 'csprg'
'cscopeprg' 'csprg'	string	(default "cscope")
			global
			{not available when compiled without the +cscope
			feature}
	Specifies the command to execute cscope.  See cscopeprg.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'cscopequickfix' 'csqf'
'cscopequickfix' 'csqf' string	(default "")
			global
			{not available when compiled without the +cscope
			or +quickfix features}
	Specifies whether to use quickfix window to show cscope results.
	See cscopequickfix.

		'cscoperelative' 'csre' 'nocscoperelative' 'nocsre'
'cscoperelative' 'csre' boolean (default off)
			global
			{not available when compiled without the +cscope
			feature}
	In the absence of a prefix (-P) for cscope. setting this option enables
	to use the basename of cscope.out path as the prefix.
	See cscoperelative.
	NOTE: This option is reset when 'compatible' is set.

				'cscopetag' 'cst' 'nocscopetag' 'nocst'
'cscopetag' 'cst'	boolean (default off)
			global
			{not available when compiled without the +cscope
			feature}
	Use cscope for tag commands.  See cscope-options.
	NOTE: This option is reset when 'compatible' is set.

						'cscopetagorder' 'csto'
'cscopetagorder' 'csto'	number	(default 0)
			global
			{not available when compiled without the +cscope
			feature}
	Determines the order in which ":cstag" performs a search.  See
	cscopetagorder.
	NOTE: This option is set to 0 when 'compatible' is set.

					'cscopeverbose' 'csverb'
					'nocscopeverbose' 'nocsverb'
'cscopeverbose' 'csverb' boolean (default off)
			global
			{not available when compiled without the +cscope
			feature}
	Give messages when adding a cscope database.  See cscopeverbose.
	NOTE: This option is reset when 'compatible' is set.

			'cursorbind' 'crb' 'nocursorbind' 'nocrb'
'cursorbind' 'crb'	boolean  (default off)
			local to window
	When this option is set, as the cursor in the current
	window moves other cursorbound windows (windows that also have
	this option set) move their cursors to the corresponding line and
	column.  This option is useful for viewing the
	differences between two versions of a file (see 'diff'); in diff mode,
	inserted and deleted lines (though not characters within a line) are
	taken into account.

			'cursorcolumn' 'cuc' 'nocursorcolumn' 'nocuc'
'cursorcolumn' 'cuc'	boolean	(default off)
			local to window
			{not available when compiled without the +syntax
			feature}
	Highlight the screen column of the cursor with CursorColumn
	hl-CursorColumn.  Useful to align text.  Will make screen redrawing
	slower.
	If you only want the highlighting in the current window you can use
	these autocommands: 
		au WinLeave * set nocursorline nocursorcolumn
		au WinEnter * set cursorline cursorcolumn


			'cursorline' 'cul' 'nocursorline' 'nocul'
'cursorline' 'cul'	boolean	(default off)
			local to window
			{not available when compiled without the +syntax
			feature}
	Highlight the text line of the cursor with CursorLine hl-CursorLine.
	Useful to easily spot the cursor.  Will make screen redrawing slower.
	When Visual mode is active the highlighting isn't used to make it
	easier to see the selected text.

						'cursorlineopt' 'culopt'
'cursorlineopt' 'culopt' string (default: "number,line")
			local to window
			{not available when compiled without the +syntax
			feature}
	Comma-separated list of settings for how 'cursorline' is displayed.
	Valid values:
	"line"		Highlight the text line of the cursor with
			CursorLine hl-CursorLine.
	"screenline"	Highlight only the screen line of the cursor with
			CursorLine hl-CursorLine.
	"number"	Highlight the line number of the cursor with
			CursorLineNr hl-CursorLineNr.

	Special value:
	"both"		Alias for the values "line,number".

	"line" and "screenline" cannot be used together.

						'debug'
'debug'			string	(default "")
			global
	These values can be used:
	msg	Error messages that would otherwise be omitted will be given
		anyway.
	throw	Error messages that would otherwise be omitted will be given
		anyway and also throw an exception and set v:errmsg.
	beep	A message will be given when otherwise only a beep would be
		produced.
	The values can be combined, separated by a comma.
	"msg" and "throw" are useful for debugging 'foldexpr', 'formatexpr' or
	'indentexpr'.

						'define' 'def'
'define' 'def'		string	(default "^\s*#\s*define")
			global or local to buffer global-local
	Pattern to be used to find a macro definition.  It is a search
	pattern, just like for the "/" command.  This option is used for the
	commands like "[i" and "[d" include-search.  The 'isident' option is
	used to recognize the defined name after the match:
		{match with 'define'}{non-ID chars}{defined name}{non-ID char}
	See option-backslash about inserting backslashes to include a space
	or backslash.
	The default value is for C programs.  For C++ this value would be
	useful, to include const type declarations: 
		^\(#\s*define\|[a-z]*\s*const\s*[a-z]*\)
	You can also use "\ze" just before the name and continue the pattern
	to check what is following.  E.g. for Javascript, if a function is
	defined with "func_name = function(args)": 
		^\s*\ze\i\+\s*=\s*function(
	If the function is defined with "func_name : function() {...": 
	        ^\s*\ze\i\+\s*[:]\s*(*function\s*(
	When using the ":set" command, you need to double the backslashes!
	To avoid that use :let with a single quote string: 
		let &l:define = '^\s*\ze\k\+\s*=\s*function('


			'delcombine' 'deco' 'nodelcombine' 'nodeco'
'delcombine' 'deco'	boolean (default off)
			global
	If editing Unicode and this option is set, backspace and Normal mode
	"x" delete each combining character on its own.  When it is off (the
	default) the character along with its combining characters are
	deleted.
	Note: When 'delcombine' is set "xx" may work differently from "2x"!

	This is useful for Arabic, Hebrew and many other languages where one
	may have combining characters overtop of base characters, and want
	to remove only the combining ones.
	NOTE: This option is reset when 'compatible' is set.

						'dictionary' 'dict'
'dictionary' 'dict'	string	(default "")
			global or local to buffer global-local
	List of file names, separated by commas, that are used to lookup words
	for keyword completion commands i_CTRL-X_CTRL-K.  Each file should
	contain a list of words.  This can be one word per line, or several
	words per line, separated by non-keyword characters (white space is
	preferred).  Maximum line length is 510 bytes.

	When this option is empty or an entry "spell" is present, and spell
	checking is enabled, words in the word lists for the currently active
	'spelllang' are used. See spell.

	To include a comma in a file name precede it with a backslash.  Spaces
	after a comma are ignored, otherwise spaces are included in the file
	name.  See option-backslash about using backslashes.
	This has nothing to do with the Dictionary variable type.
	Where to find a list of words?
	- On FreeBSD, there is the file "/usr/share/dict/words".
	- In the Simtel archive, look in the "msdos/linguist" directory.
	- In "miscfiles" of the GNU collection.
	The use of :set+= and :set-= is preferred when adding or removing
	directories from the list.  This avoids problems when a future version
	uses another default.
	Backticks cannot be used in this option for security reasons.

							'diff' 'nodiff'
'diff'			boolean	(default off)
			local to window
			{not available when compiled without the +diff
			feature}
	Join the current window in the group of windows that shows differences
	between files.  See vimdiff.

						'dex' 'diffexpr'
'diffexpr' 'dex'	string	(default "")
			global
			{not available when compiled without the +diff
			feature}
	Expression which is evaluated to obtain a diff file (either ed-style
	or unified-style) from two versions of a file.  See diff-diffexpr.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'dip' 'diffopt'
'diffopt' 'dip'		string	(default "internal,filler,closeoff")
			global
			{not available when compiled without the +diff
			feature}
	Option settings for diff mode.  It can consist of the following items.
	All are optional.  Items must be separated by a comma.

		filler		Show filler lines, to keep the text
				synchronized with a window that has inserted
				lines at the same position.  Mostly useful
				when windows are side-by-side and 'scrollbind'
				is set.

		context:{n}	Use a context of {n} lines between a change
				and a fold that contains unchanged lines.
				When omitted a context of six lines is used.
				When using zero the context is actually one,
				since folds require a line in between, also
				for a deleted line. Set it to a very large
				value (999999) to disable folding completely.
				See fold-diff.

		iblank		Ignore changes where lines are all blank.  Adds
				the "-B" flag to the "diff" command if
				'diffexpr' is empty.  Check the documentation
				of the "diff" command for what this does
				exactly.
				NOTE: the diff windows will get out of sync,
				because no differences between blank lines are
				taken into account.

		icase		Ignore changes in case of text.  "a" and "A"
				are considered the same.  Adds the "-i" flag
				to the "diff" command if 'diffexpr' is empty.

		iwhite		Ignore changes in amount of white space.  Adds
				the "-b" flag to the "diff" command if
				'diffexpr' is empty.  Check the documentation
				of the "diff" command for what this does
				exactly.  It should ignore adding trailing
				white space, but not leading white space.

		iwhiteall	Ignore all white space changes.  Adds
				the "-w" flag to the "diff" command if
				'diffexpr' is empty.  Check the documentation
				of the "diff" command for what this does
				exactly.

		iwhiteeol	Ignore white space changes at end of line.
				Adds the "-Z" flag to the "diff" command if
				'diffexpr' is empty.  Check the documentation
				of the "diff" command for what this does
				exactly.

		horizontal	Start diff mode with horizontal splits (unless
				explicitly specified otherwise).

		vertical	Start diff mode with vertical splits (unless
				explicitly specified otherwise).

		closeoff	When a window is closed where 'diff' is set
				and there is only one window remaining in the
				same tab page with 'diff' set, execute
				:diffoff in that window.  This undoes a
				:diffsplit command.

		hiddenoff	Do not use diff mode for a buffer when it
				becomes hidden.

		foldcolumn:{n}	Set the 'foldcolumn' option to {n} when
				starting diff mode.  Without this 2 is used.

		followwrap	Follow the 'wrap' option and leave as it is.

		internal	Use the internal diff library.  This is
				ignored when 'diffexpr' is set.  E960
				When running out of memory when writing a
				buffer this item will be ignored for diffs
				involving that buffer.  Set the 'verbose'
				option to see when this happens.

		indent-heuristic
				Use the indent heuristic for the internal
				diff library.

                algorithm:{text} Use the specified diff algorithm with the
				internal diff engine. Currently supported
				algorithms are:
				myers      the default algorithm
				minimal    spend extra time to generate the
					   smallest possible diff
				patience   patience diff algorithm
				histogram  histogram diff algorithm

	Examples: 
		:set diffopt=internal,filler,context:4
		:set diffopt=
		:set diffopt=internal,filler,foldcolumn:3
		:set diffopt-=internal  " do NOT use the internal diff parser

				     'digraph' 'dg' 'nodigraph' 'nodg'
'digraph' 'dg'		boolean	(default off)
			global
			{not available when compiled without the +digraphs
			feature}
	Enable the entering of digraphs in Insert mode with {char1} <BS>
	{char2}.  See digraphs.
	NOTE: This option is reset when 'compatible' is set.

						'directory' 'dir'
'directory' 'dir'	string	(default for Amiga: ".,t:",
				 for Win32: ".,$TEMP,c:\tmp,c:\temp"
				 for Unix: ".,~/tmp,/var/tmp,/tmp")
			global
	List of directory names for the swap file, separated with commas.
	Recommended value:  ".,~/vimswap//" - this will put the swap file next
	to the edited file if possible, and in your personal swap directory
	otherwise.  Make sure "~/vimswap//" is only readable for you.

	Possible items:
	- The swap file will be created in the first directory where this is
	  possible.
	- Empty means that no swap file will be used (recovery is
	  impossible!) and no E303 error will be given.
	- A directory "." means to put the swap file in the same directory as
	  the edited file.  On Unix, a dot is prepended to the file name, so
	  it doesn't show in a directory listing.  On MS-Windows the "hidden"
	  attribute is set and a dot prepended if possible.
	- A directory starting with "./" (or ".\" for MS-Windows) means to put
	  the swap file relative to where the edited file is.  The leading "."
	  is replaced with the path name of the edited file.
	- For Unix and Win32, if a directory ends in two path separators "//",
	  the swap file name will be built from the complete path to the file
	  with all path separators replaced by percent '%' signs (including
	  the colon following the drive letter on Win32). This will ensure
	  file name uniqueness in the preserve directory.
	  On Win32, it is also possible to end with "\\".  However, When a
	  separating comma is following, you must use "//", since "\\" will
	  include the comma in the file name. Therefore it is recommended to
	  use '//', instead of '\\'.
	- Spaces after the comma are ignored, other spaces are considered part
	  of the directory name.  To have a space at the start of a directory
	  name, precede it with a backslash.
	- To include a comma in a directory name precede it with a backslash.
	- A directory name may end in an ':' or '/'.
	- Environment variables are expanded :set_env.
	- Careful with '\' characters, type one before a space, type two to
	  get one in the option (see option-backslash), for example: 
	    :set dir=c:\\tmp,\ dir\\,with\\,commas,\\\ dir\ with\ spaces
	- For backwards compatibility with Vim version 3.0 a '>' at the start
	  of the option is removed.
	Using "." first in the list is recommended.  This means that editing
	the same file twice will result in a warning.  Using "/tmp" on Unix is
	discouraged: When the system crashes you lose the swap file.
	"/var/tmp" is often not cleared when rebooting, thus is a better
	choice than "/tmp".  But others on the computer may be able to see the
	files, and it can contain a lot of files, your swap files get lost in
	the crowd.  That is why a "tmp" directory in your home directory is
	tried first.
	The use of :set+= and :set-= is preferred when adding or removing
	directories from the list.  This avoids problems when a future version
	uses another default.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

					'display' 'dy'
'display' 'dy'		string	(default "", set to "truncate" in
							       defaults.vim)
			global
	Change the way text is displayed.  This is a comma-separated list of
	flags:
	lastline	When included, as much as possible of the last line
			in a window will be displayed.  "@@@" is put in the
			last columns of the last screen line to indicate the
			rest of the line is not displayed.
	truncate	Like "lastline", but "@@@" is displayed in the first
			column of the last screen line.  Overrules "lastline".
	uhex		Show unprintable characters hexadecimal as <xx>
			instead of using ^C and ~C.

	When neither "lastline" nor "truncate" is included, a last line that
	doesn't fit is replaced with "@" lines.

	The "@" character can be changed by setting the "lastline" item in
	'fillchars'.  The character is highlighted with hl-NonText.

						'eadirection' 'ead'
'eadirection' 'ead'	string	(default "both")
			global
	Tells when the 'equalalways' option applies:
		ver	vertically, width of windows is not affected
		hor	horizontally, height of windows is not affected
		both	width and height of windows is affected

			   'ed' 'edcompatible' 'noed' 'noedcompatible'
'edcompatible' 'ed'	boolean	(default off)
			global
	Makes the 'g' and 'c' flags of the ":substitute" command to be
	toggled each time the flag is given.  See complex-change.  See
	also 'gdefault' option.
	Switching this option on may break plugins!
	This option is not used in Vim9 script.

					'emoji' 'emo' 'noemoji' 'noemo'
'emoji' 'emo'	boolean (default: on)
			global
	When on all Unicode emoji characters are considered to be full width.
	This excludes "text emoji" characters, which are normally displayed as
	single width.  Unfortunately there is no good specification for this
	and it has been determined on trial-and-error basis.  Use the
	setcellwidths() function to change the behavior.

					'encoding' 'enc' E543
'encoding' 'enc'	string (default for MS-Windows: "utf-8",
				otherwise: value from $LANG or "latin1")
			global
	Sets the character encoding used inside Vim.  It applies to text in
	the buffers, registers, Strings in expressions, text stored in the
	viminfo file, etc.  It sets the kind of characters which Vim can work
	with.  See encoding-names for the possible values.

	NOTE: Changing this option will not change the encoding of the
	existing text in Vim.  It may cause non-ASCII text to become invalid.
	It should normally be kept at its default value, or set when Vim
	starts up.  See multibyte.  To reload the menus see :menutrans.

	This option cannot be set from a modeline.  It would most likely
	corrupt the text.

	NOTE: For MacVim and GTK+, it is highly recommended to set 'encoding'
	to "utf-8".  Although care has been taken to allow different values of
	'encoding', "utf-8" is the natural choice for the environment and
	avoids unnecessary conversion overhead.  "utf-8" has not been made
	the default to prevent different behavior of the GUI and terminal
	versions, and to avoid changing the encoding of newly created files
	without your knowledge (in case 'fileencodings' is empty).

	The character encoding of files can be different from 'encoding'.
	This is specified with 'fileencoding'.  The conversion is done with
	iconv() or as specified with 'charconvert'.

	If you need to know whether 'encoding' is a multibyte encoding, you
	can use: 
		if has("multi_byte_encoding")

	Normally 'encoding' will be equal to your current locale.  This will
	be the default if Vim recognizes your environment settings.  If
	'encoding' is not set to the current locale, 'termencoding' must be
	set to convert typed and displayed text.  See encoding-table.

	When you set this option, it fires the EncodingChanged autocommand
	event so that you can set up fonts if necessary.

	When the option is set, the value is converted to lowercase.  Thus
	you can set it with uppercase values too.  Underscores are translated
	to '-' signs.
	When the encoding is recognized, it is changed to the standard name.
	For example "Latin-1" becomes "latin1", "ISO_88592" becomes
	"iso-8859-2" and "utf8" becomes "utf-8".

	Note: "latin1" is also used when the encoding could not be detected.
	This only works when editing files in the same encoding!  When the
	actual character set is not latin1, make sure 'fileencoding' and
	'fileencodings' are empty.  When conversion is needed, switch to using
	utf-8.

	When "unicode", "ucs-2" or "ucs-4" is used, Vim internally uses utf-8.
	You don't notice this while editing, but it does matter for the
	viminfo-file.  And Vim expects the terminal to use utf-8 too.  Thus
	setting 'encoding' to one of these values instead of utf-8 only has
	effect for encoding used for files when 'fileencoding' is empty.

	When 'encoding' is set to a Unicode encoding, and 'fileencodings' was
	not set yet, the default for 'fileencodings' is changed.

			'endoffile' 'eof' 'noendoffile' 'noeof'
'endoffile' 'eof'	boolean	(default off)
			local to buffer
	Indicates that a CTRL-Z character was found at the end of the file
	when reading it.  Normally only happens when 'fileformat' is "dos".
	When writing a file and this option is off and the 'binary' option
	is on, or 'fixeol' option is off, no CTRL-Z will be written at the
	end of the file.
	See eol-and-eof for example settings.

			'endofline' 'eol' 'noendofline' 'noeol'
'endofline' 'eol'	boolean	(default on)
			local to buffer
	When writing a file and this option is off and the 'binary' option
	is on, or 'fixeol' option is off, no <EOL> will be written for the
	last line in the file.  This option is automatically set or reset when
	starting to edit a new file, depending on whether file has an <EOL>
	for the last line in the file.  Normally you don't have to set or
	reset this option.
	When 'binary' is off and 'fixeol' is on the value is not used when
	writing the file.  When 'binary' is on or 'fixeol' is off it is used
	to remember the presence of a <EOL> for the last line in the file, so
	that when you write the file the situation from the original file can
	be kept.  But you can change it if you want to.
	See eol-and-eof for example settings.

			     'equalalways' 'ea' 'noequalalways' 'noea'
'equalalways' 'ea'	boolean	(default on)
			global
	When on, all the windows are automatically made the same size after
	splitting or closing a window.  This also happens the moment the
	option is switched on.  When off, splitting a window will reduce the
	size of the current window and leave the other windows the same.  When
	closing a window the extra lines are given to the window next to it
	(depending on 'splitbelow' and 'splitright').
	When mixing vertically and horizontally split windows, a minimal size
	is computed and some windows may be larger if there is room.  The
	'eadirection' option tells in which direction the size is affected.
	Changing the height and width of a window can be avoided by setting
	'winfixheight' and 'winfixwidth', respectively.
	If a window size is specified when creating a new window sizes are
	currently not equalized (it's complicated, but may be implemented in
	the future).

						'equalprg' 'ep'
'equalprg' 'ep'		string	(default "")
			global or local to buffer global-local
	External program to use for "=" command.  When this option is empty
	the internal formatting functions are used; either 'lisp', 'cindent'
	or 'indentexpr'.  When Vim was compiled without internal formatting,
	the "indent" program is used.
	Environment variables are expanded :set_env.  See option-backslash
	about including spaces and backslashes.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

			'errorbells' 'eb' 'noerrorbells' 'noeb'
'errorbells' 'eb'	boolean	(default off)
			global
	Ring the bell (beep or screen flash) for error messages.  This only
	makes a difference for error messages, the bell will be used always
	for a lot of errors without a message (e.g., hitting <Esc> in Normal
	mode).  See 'visualbell' on how to make the bell behave like a beep,
	screen flash or do nothing. See 'belloff' to finetune when to ring the
	bell.

						'errorfile' 'ef'
'errorfile' 'ef'	string	(Amiga default: "AztecC.Err",
					others: "errors.err")
			global
			{not available when compiled without the +quickfix
			feature}
	Name of the errorfile for the QuickFix mode (see :cf).
	When the "-q" command-line argument is used, 'errorfile' is set to the
	following argument.  See -q.
	NOT used for the ":make" command.  See 'makeef' for that.
	Environment variables are expanded :set_env.
	See option-backslash about including spaces and backslashes.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'errorformat' 'efm'
'errorformat' 'efm'	string	(default is very long)
			global or local to buffer global-local
			{not available when compiled without the +quickfix
			feature}
	Scanf-like description of the format for the lines in the error file
	(see errorformat).

				     'esckeys' 'ek' 'noesckeys' 'noek'
'esckeys' 'ek'		boolean	(Vim default: on, Vi default: off)
			global
	Function keys that start with an <Esc> are recognized in Insert
	mode.  When this option is off, the cursor and function keys cannot be
	used in Insert mode if they start with an <Esc>.  The advantage of
	this is that the single <Esc> is recognized immediately, instead of
	after one second.  Instead of resetting this option, you might want to
	try changing the values for 'timeoutlen' and 'ttimeoutlen'.  Note that
	when 'esckeys' is off, you can still map anything, but the cursor keys
	won't work by default.
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.
	NOTE: when this option is off then the modifyOtherKeys and
	xterm-bracketed-paste functionality is disabled while in Insert mode
	to avoid ending Insert mode with any key that has a modifier.

						'eventignore' 'ei'
'eventignore' 'ei'	string	(default "")
			global
	A list of autocommand event names, which are to be ignored.
	When set to "all" or when "all" is one of the items, all autocommand
	events are ignored, autocommands will not be executed.
	Otherwise this is a comma-separated list of event names.  Example: 
	    :set ei=WinEnter,WinLeave

				 'expandtab' 'et' 'noexpandtab' 'noet'
'expandtab' 'et'	boolean	(default off)
			local to buffer
	In Insert mode: Use the appropriate number of spaces to insert a
	<Tab>.  Spaces are used in indents with the '>' and '<' commands and
	when 'autoindent' is on.  To insert a real tab when 'expandtab' is
	on, use CTRL-V<Tab>.  See also :retab and ins-expandtab.
	This option is reset when the 'paste' option is set and restored when
	the 'paste' option is reset.
	NOTE: This option is reset when 'compatible' is set.

					'exrc' 'ex' 'noexrc' 'noex'
'exrc' 'ex'		boolean (default off)
			global
	Enables the reading of .vimrc, .exrc and .gvimrc in the current
	directory.

	Setting this option is a potential security leak.  E.g., consider
	unpacking a package or fetching files from github, a .vimrc in there
	might be a trojan horse.  BETTER NOT SET THIS OPTION!
	Instead, define an autocommand in your .vimrc to set options for a
	matching directory.

	If you do switch this option on you should also consider setting the
	'secure' option (see initialization).
	Also see .vimrc and gui-init.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

				'fileencoding' 'fenc' E213
'fileencoding' 'fenc'	string (default: "")
			local to buffer
	Sets the character encoding for the file of this buffer.

	When 'fileencoding' is different from 'encoding', conversion will be
	done when writing the file.  For reading see below.
	When 'fileencoding' is empty, the same value as 'encoding' will be
	used (no conversion when reading or writing a file).
	No error will be given when the value is set, only when it is used,
	only when writing a file.
	Conversion will also be done when 'encoding' and 'fileencoding' are
	both a Unicode encoding and 'fileencoding' is not utf-8.  That's
	because internally Unicode is always stored as utf-8.
		WARNING: Conversion can cause loss of information!  When
		'encoding' is "utf-8" or another Unicode encoding, conversion
		is most likely done in a way that the reverse conversion
		results in the same text.  When 'encoding' is not "utf-8" some
		characters may be lost!

	See 'encoding' for the possible values.  Additionally, values may be
	specified that can be handled by the converter, see
	mbyte-conversion.

	When reading a file 'fileencoding' will be set from 'fileencodings'.
	To read a file in a certain encoding it won't work by setting
	'fileencoding', use the ++enc argument.  One exception: when
	'fileencodings' is empty the value of 'fileencoding' is used.
	For a new file the global value of 'fileencoding' is used.

	Prepending "8bit-" and "2byte-" has no meaning here, they are ignored.
	When the option is set, the value is converted to lowercase.  Thus
	you can set it with uppercase values too.  '_' characters are
	replaced with '-'.  If a name is recognized from the list for
	'encoding', it is replaced by the standard name.  For example
	"ISO8859-2" becomes "iso-8859-2".

	When this option is set, after starting to edit a file, the 'modified'
	option is set, because the file would be different when written.

	Keep in mind that changing 'fenc' from a modeline happens
	AFTER the text has been read, thus it applies to when the file will be
	written.  If you do set 'fenc' in a modeline, you might want to set
	'nomodified' to avoid not being able to ":q".

	This option can not be changed when 'modifiable' is off.

							'fe'
	NOTE: Before version 6.0 this option specified the encoding for the
	whole of Vim, this was a mistake.  Now use 'encoding' instead.  The
	old short name was 'fe', which is no longer used.

					'fileencodings' 'fencs'
'fileencodings' 'fencs'	string (default: "ucs-bom",
				    "ucs-bom,utf-8,default,latin1" when
				    'encoding' is set to a Unicode value)
			global
	This is a list of character encodings considered when starting to edit
	an existing file.  When a file is read, Vim tries to use the first
	mentioned character encoding.  If an error is detected, the next one
	in the list is tried.  When an encoding is found that works,
	'fileencoding' is set to it.  If all fail, 'fileencoding' is set to
	an empty string, which means the value of 'encoding' is used.
		WARNING: Conversion can cause loss of information!  When
		'encoding' is "utf-8" (or one of the other Unicode variants)
		conversion is most likely done in a way that the reverse
		conversion results in the same text.  When 'encoding' is not
		"utf-8" some non-ASCII characters may be lost!  You can use
		the ++bad argument to specify what is done with characters
		that can't be converted.
	For an empty file or a file with only ASCII characters most encodings
	will work and the first entry of 'fileencodings' will be used (except
	"ucs-bom", which requires the BOM to be present).  If you prefer
	another encoding use an BufReadPost autocommand event to test if your
	preferred encoding is to be used.  Example: 
		au BufReadPost * if search('\S', 'w') == 0 |
			\ set fenc=iso-2022-jp | endif
	This sets 'fileencoding' to "iso-2022-jp" if the file does not contain
	non-blank characters.
	When the ++enc argument is used then the value of 'fileencodings' is
	not used.
	Note that 'fileencodings' is not used for a new file, the global value
	of 'fileencoding' is used instead.  You can set it with: 
		:setglobal fenc=iso-8859-2
	This means that a non-existing file may get a different encoding than
	an empty file.
	The special value "ucs-bom" can be used to check for a Unicode BOM
	(Byte Order Mark) at the start of the file.  It must not be preceded
	by "utf-8" or another Unicode encoding for this to work properly.
	An entry for an 8-bit encoding (e.g., "latin1") should be the last,
	because Vim cannot detect an error, thus the encoding is always
	accepted.
	The special value "default" can be used for the encoding from the
	environment.  On MS-Windows this is the system encoding.  Otherwise
	this is the default value for 'encoding'.  It is useful when
	'encoding' is set to "utf-8" and your environment uses a non-latin1
	encoding, such as Russian.
	When 'encoding' is "utf-8" and a file contains an illegal byte
	sequence it won't be recognized as UTF-8.  You can use the 8g8
	command to find the illegal byte sequence.
	WRONG VALUES:			WHAT'S WRONG:
		latin1,utf-8		"latin1" will always be used
		utf-8,ucs-bom,latin1	BOM won't be recognized in an utf-8
					file
		cp1250,latin1		"cp1250" will always be used
	If 'fileencodings' is empty, 'fileencoding' is not modified.
	See 'fileencoding' for the possible values.
	Setting this option does not have an effect until the next time a file
	is read.

					'fileformat' 'ff'
'fileformat' 'ff'	string (MS-Windows default: "dos",
				Unix, macOS default: "unix")
			local to buffer
	This gives the <EOL> of the current buffer, which is used for
	reading/writing the buffer from/to a file:
	    dos	    <CR><NL>
	    unix    <NL>
	    mac	    <CR>
	When "dos" is used, CTRL-Z at the end of a file is ignored.
	See file-formats and file-read.
	For the character encoding of the file see 'fileencoding'.
	When 'binary' is set, the value of 'fileformat' is ignored, file I/O
	works like it was set to "unix".
	This option is set automatically when starting to edit a file and
	'fileformats' is not empty and 'binary' is off.
	When this option is set, after starting to edit a file, the 'modified'
	option is set, because the file would be different when written.
	This option can not be changed when 'modifiable' is off.
	For backwards compatibility: When this option is set to "dos",
	'textmode' is set, otherwise 'textmode' is reset.

					'fileformats' 'ffs'
'fileformats' 'ffs'	string (default:
				Vim+Vi	MS-Windows: "dos,unix",
				Vim	Unix, macOS: "unix,dos",
				Vi	Cygwin: "unix,dos",
				Vi	others: "")
			global
	This gives the end-of-line (<EOL>) formats that will be tried when
	starting to edit a new buffer and when reading a file into an existing
	buffer:
	- When empty, the format defined with 'fileformat' will be used
	  always.  It is not set automatically.
	- When set to one name, that format will be used whenever a new buffer
	  is opened.  'fileformat' is set accordingly for that buffer.  The
	  'fileformats' name will be used when a file is read into an existing
	  buffer, no matter what 'fileformat' for that buffer is set to.
	- When more than one name is present, separated by commas, automatic
	  <EOL> detection will be done when reading a file.  When starting to
	  edit a file, a check is done for the <EOL>:
	  1. If all lines end in <CR><NL>, and 'fileformats' includes "dos",
	     'fileformat' is set to "dos".
	  2. If a <NL> is found and 'fileformats' includes "unix", 'fileformat'
	     is set to "unix".  Note that when a <NL> is found without a
	     preceding <CR>, "unix" is preferred over "dos".
	  3. If 'fileformat' has not yet been set, and if a <CR> is found, and
	     if 'fileformats' includes "mac", 'fileformat' is set to "mac".
	     This means that "mac" is only chosen when:
	      "unix" is not present or no <NL> is found in the file, and
	      "dos" is not present or no <CR><NL> is found in the file.
	     Except: if "unix" was chosen, but there is a <CR> before
	     the first <NL>, and there appear to be more <CR>s than <NL>s in
	     the first few lines, "mac" is used.
	  4. If 'fileformat' is still not set, the first name from
	     'fileformats' is used.
	  When reading a file into an existing buffer, the same is done, but
	  this happens like 'fileformat' has been set appropriately for that
	  file only, the option is not changed.
	When 'binary' is set, the value of 'fileformats' is not used.

	When Vim starts up with an empty buffer the first item is used.  You
	can overrule this by setting 'fileformat' in your .vimrc.

	For systems with a Dos-like <EOL> (<CR><NL>), when reading files that
	are ":source"ed and for vimrc files, automatic <EOL> detection may be
	done:
	- When 'fileformats' is empty, there is no automatic detection.  Dos
	  format will be used.
	- When 'fileformats' is set to one or more names, automatic detection
	  is done.  This is based on the first <NL> in the file: If there is a
	  <CR> in front of it, Dos format is used, otherwise Unix format is
	  used.
	Also see file-formats.
	For backwards compatibility: When this option is set to an empty
	string or one format (no comma is included), 'textauto' is reset,
	otherwise 'textauto' is set.
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

		'fileignorecase' 'fic' 'nofileignorecase' 'nofic'
'fileignorecase' 'fic'	boolean	(default on for systems where case in file
				 names is normally ignored)
			global
	When set case is ignored when using file names and directories.
	See 'wildignorecase' for only ignoring case when doing completion.

					'filetype' 'ft'
'filetype' 'ft'		string (default: "")
			local to buffer  local-noglobal
	When this option is set, the FileType autocommand event is triggered.
	All autocommands that match with the value of this option will be
	executed.  Thus the value of 'filetype' is used in place of the file
	name.
	Otherwise this option does not always reflect the current file type.
	This option is normally set when the file type is detected.  To enable
	this use the ":filetype on" command. :filetype
	Setting this option to a different value is most useful in a modeline,
	for a file for which the file type is not automatically recognized.
	Example, for in an IDL file:
		/* vim: set filetype=idl : */ 
	FileType filetypes
	When a dot appears in the value then this separates two filetype
	names.  Example:
		/* vim: set filetype=c.doxygen : */ 
	This will use the "c" filetype first, then the "doxygen" filetype.
	This works both for filetype plugins and for syntax files.  More than
	one dot may appear.
	This option is not copied to another buffer, independent of the 's' or
	'S' flag in 'cpoptions'.
	Only normal file name characters can be used, "/\*?[|<>" are illegal.

						'fillchars' 'fcs'
'fillchars' 'fcs'	string	(default "vert:|,fold:-,eob:~")
			global or local to window global-local
	Characters to fill the statuslines, vertical separators and special
	lines in the window.
	It is a comma-separated list of items.  Each item has a name, a colon
	and the value of that item: E1511

	  item name	default		Used for 
	  stl		' '		statusline of the current window
	  stlnc		' '		statusline of the non-current windows
	  vert		'|'		vertical separators :vsplit
	  fold		'-'		filling 'foldtext'
	  foldopen	'-'		mark the beginning of a fold
	  foldclose	'+'		show a closed fold
	  foldsep	'|'		open fold middle character
	  diff		'-'		deleted lines of the 'diff' option
	  eob		'~'		empty lines below the end of a buffer
	  lastline	'@'		'display' contains lastline/truncate

	Any one that is omitted will fall back to the default.

	Example: 
	    :set fillchars=stl:\ ,stlnc:\ ,vert:\|,fold:-,diff:-

	For the "stl", "stlnc", "foldopen", "foldclose" and "foldsep" items
	single-byte and multibyte characters are supported.  But double-width
	characters are not supported. E1512

	The highlighting used for these items:
	  item name	highlight group 
	  stl		StatusLine		hl-StatusLine
	  stlnc		StatusLineNC		hl-StatusLineNC
	  vert		VertSplit		hl-VertSplit
	  fold		Folded			hl-Folded
	  diff		DiffDelete		hl-DiffDelete
	  eob		EndOfBuffer		hl-EndOfBuffer
	  lastline	NonText			hl-NonText

		'fixendofline' 'fixeol' 'nofixendofline' 'nofixeol'
'fixendofline' 'fixeol'	boolean	(default on)
			local to buffer
	When writing a file and this option is on, <EOL> at the end of file
	will be restored if missing.  Turn this option off if you want to
	preserve the situation from the original file.
	When the 'binary' option is set the value of this option doesn't
	matter.
	See the 'endofline' option.
	See eol-and-eof for example settings.

					'fkmap' 'fk' 'nofkmap' 'nofk'
'fkmap' 'fk'		boolean (default off)
			global
			{only available when compiled with the +rightleft
			feature}
	This option was for using Farsi, which has been removed.  See
	farsi.txt.

						'foldclose' 'fcl'
'foldclose' 'fcl'	string (default "")
			global
			{not available when compiled without the +folding
			feature}
	When set to "all", a fold is closed when the cursor isn't in it and
	its level is higher than 'foldlevel'.  Useful if you want folds to
	automatically close when moving out of them.

						'foldcolumn' 'fdc'
'foldcolumn' 'fdc'	number (default 0)
			local to window
			{not available when compiled without the +folding
			feature}
	When non-zero, a column with the specified width is shown at the side
	of the window which indicates open and closed folds.  The maximum
	value is 12.
	See folding.

			'foldenable' 'fen' 'nofoldenable' 'nofen'
'foldenable' 'fen'	boolean (default on)
			local to window
			{not available when compiled without the +folding
			feature}
	When off, all folds are open.  This option can be used to quickly
	switch between showing all text unfolded and viewing the text with
	folds (including manually opened or closed folds).  It can be toggled
	with the zi command.  The 'foldcolumn' will remain blank when
	'foldenable' is off.
	This option is set by commands that create a new fold or close a fold.
	See folding.

						'foldexpr' 'fde'
'foldexpr' 'fde'	string (default: "0")
			local to window
			{not available when compiled without the +folding
			or +eval features}
	The expression used for when 'foldmethod' is "expr".  It is evaluated
	for each line to obtain its fold level.  The context is set to the
	script where 'foldexpr' was set, script-local items can be accessed.
	See fold-expr for the usage.

	The expression will be evaluated in the sandbox if set from a
	modeline, see sandbox-option.
	This option can't be set from a modeline when the 'diff' option is
	on or the 'modelineexpr' option is off.

	It is not allowed to change text or jump to another window while
	evaluating 'foldexpr' textlock.

						'foldignore' 'fdi'
'foldignore' 'fdi'	string (default: "#")
			local to window
			{not available when compiled without the +folding
			feature}
	Used only when 'foldmethod' is "indent".  Lines starting with
	characters in 'foldignore' will get their fold level from surrounding
	lines.  White space is skipped before checking for this character.
	The default "#" works well for C programs.  See fold-indent.

						'foldlevel' 'fdl'
'foldlevel' 'fdl'	number (default: 0)
			local to window
			{not available when compiled without the +folding
			feature}
	Sets the fold level: Folds with a higher level will be closed.
	Setting this option to zero will close all folds.  Higher numbers will
	close fewer folds.
	This option is set by commands like zm, zM and zR.
	See fold-foldlevel.

						'foldlevelstart' 'fdls'
'foldlevelstart' 'fdls'	number (default: -1)
			global
			{not available when compiled without the +folding
			feature}
	Sets 'foldlevel' when starting to edit another buffer in a window.
	Useful to always start editing with all folds closed (value zero),
	some folds closed (one) or no folds closed (99).
	This is done before reading any modeline, thus a setting in a modeline
	overrules this option.  Starting to edit a file for diff-mode also
	ignores this option and closes all folds.
	It is also done before BufReadPre autocommands, to allow an autocmd to
	overrule the 'foldlevel' value for specific files.
	When the value is negative, it is not used.

						'foldmarker' 'fmr' E536
'foldmarker' 'fmr'	string (default: "{{{,}}}")
			local to window
			{not available when compiled without the +folding
			feature}
	The start and end marker used when 'foldmethod' is "marker".  There
	must be one comma, which separates the start and end marker.  The
	marker is a literal string (a regular expression would be too slow).
	See fold-marker.

						'foldmethod' 'fdm'
'foldmethod' 'fdm'	string (default: "manual")
			local to window
			{not available when compiled without the +folding
			feature}
	The kind of folding used for the current window.  Possible values:
	fold-manual  	manual	    Folds are created manually.
	fold-indent  	indent	    Lines with equal indent form a fold.
	fold-expr  	expr	    'foldexpr' gives the fold level of a line.
	fold-marker  	marker	    Markers are used to specify folds.
	fold-syntax  	syntax	    Syntax highlighting items specify folds.
	fold-diff  	diff	    Fold text that is not changed.

						'foldminlines' 'fml'
'foldminlines' 'fml'	number (default: 1)
			local to window
			{not available when compiled without the +folding
			feature}
	Sets the number of screen lines above which a fold can be displayed
	closed.  Also for manually closed folds.  With the default value of
	one a fold can only be closed if it takes up two or more screen lines.
	Set to zero to be able to close folds of just one screen line.
	Note that this only has an effect on what is displayed.  After using
	"zc" to close a fold, which is displayed open because it's smaller
	than 'foldminlines', a following "zc" may close a containing fold.

						'foldnestmax' 'fdn'
'foldnestmax' 'fdn'	number (default: 20)
			local to window
			{not available when compiled without the +folding
			feature}
	Sets the maximum nesting of folds for the "indent" and "syntax"
	methods.  This avoids that too many folds will be created.  Using more
	than 20 doesn't work, because the internal limit is 20.

						'foldopen' 'fdo'
'foldopen' 'fdo'	string (default: "block,hor,mark,percent,quickfix,
							     search,tag,undo")
			global
			{not available when compiled without the +folding
			feature}
	Specifies for which type of commands folds will be opened, if the
	command moves the cursor into a closed fold.  It is a comma-separated
	list of items.
	NOTE: When the command is part of a mapping this option is not used.
	Add the zv command to the mapping to get the same effect.
	(rationale: the mapping may want to control opening folds itself)

		item		commands 
		all		any
		block		"(", "{", "[[", "[{", etc.
		hor		horizontal movements: "l", "w", "fx", etc.
		insert		any command in Insert mode
		jump		far jumps: "G", "gg", etc.
		mark		jumping to a mark: "'m", CTRL-O, etc.
		percent		"%"
		quickfix	":cn", ":crew", ":make", etc.
		search		search for a pattern: "/", "n", "*", "gd", etc.
				(not for a search pattern in a ":" command)
				Also for [s and ]s.
		tag		jumping to a tag: ":ta", CTRL-T, etc.
		undo		undo or redo: "u" and CTRL-R
	When a movement command is used for an operator (e.g., "dl" or "y%")
	this option is not used.  This means the operator will include the
	whole closed fold.
	Note that vertical movements are not here, because it would make it
	very difficult to move onto a closed fold.
	In insert mode the folds containing the cursor will always be open
	when text is inserted.
	To close folds you can re-apply 'foldlevel' with the zx command or
	set the 'foldclose' option to "all".

						'foldtext' 'fdt'
'foldtext' 'fdt'	string (default: "foldtext()")
			local to window
			{not available when compiled without the +folding
			feature}
	An expression which is used to specify the text displayed for a closed
	fold.  The context is set to the script where 'foldexpr' was set,
	script-local items can be accessed.  See fold-foldtext for the
	usage.

	The expression will be evaluated in the sandbox if set from a
	modeline, see sandbox-option.
	This option cannot be set in a modeline when 'modelineexpr' is off.

	It is not allowed to change text or jump to another window while
	evaluating 'foldtext' textlock.

						'formatexpr' 'fex'
'formatexpr' 'fex'	string (default "")
			local to buffer
			{not available when compiled without the +eval
			feature}
	Expression which is evaluated to format a range of lines for the gq
	operator or automatic formatting (see 'formatoptions').  When this
	option is empty 'formatprg' is used.

	The v:lnum  variable holds the first line to be formatted.
	The v:count variable holds the number of lines to be formatted.
	The v:char  variable holds the character that is going to be
		      inserted if the expression is being evaluated due to
		      automatic formatting.  This can be empty.  Don't insert
		      it yet!

	Example: 
		:set formatexpr=mylang#Format()
	This will invoke the mylang#Format() function in the
	autoload/mylang.vim file in 'runtimepath'. autoload

	The advantage of using a function call without arguments is that it is
	faster, see expr-option-function.

	The expression is also evaluated when 'textwidth' is set and adding
	text beyond that limit.  This happens under the same conditions as
	when internal formatting is used.  Make sure the cursor is kept in the
	same spot relative to the text then!  The mode() function will
	return "i" or "R" in this situation.

	When the expression evaluates to non-zero Vim will fall back to using
	the internal format mechanism.

	If the expression starts with s: or <SID>, then it is replaced with
	the script ID (local-function). Example: 
		set formatexpr=s:MyFormatExpr()
		set formatexpr=<SID>SomeFormatExpr()
	Otherwise, the expression is evaluated in the context of the script
	where the option was set, thus script-local items are available.

	The expression will be evaluated in the sandbox when set from a
	modeline, see sandbox-option.  That stops the option from working,
	since changing the buffer text is not allowed.
	This option cannot be set in a modeline when 'modelineexpr' is off.
	NOTE: This option is set to "" when 'compatible' is set.

					'formatlistpat' 'flp'
'formatlistpat' 'flp'	string (default: "^\s*\d\+[\]:.)}\t ]\s*")
			local to buffer
	A pattern that is used to recognize a list header.  This is used for
	the "n" flag in 'formatoptions'.
	The pattern must match exactly the text that will be the indent for
	the line below it.  You can use /\ze to mark the end of the match
	while still checking more characters.  There must be a character
	following the pattern, when it matches the whole line it is handled
	like there is no match.
	The default recognizes a number, followed by an optional punctuation
	character and white space.

					'formatoptions' 'fo'
'formatoptions' 'fo'	string (Vim default: "tcq", Vi default: "vt")
			local to buffer
	This is a sequence of letters which describes how automatic
	formatting is to be done.
	See fo-table for possible values and gq for how to format text.
	When the 'paste' option is on, no formatting is done (like
	'formatoptions' is empty).  Commas can be inserted for readability.
	To avoid problems with flags that are added in the future, use the
	"+=" and "-=" feature of ":set" add-option-flags.
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

						'formatprg' 'fp'
'formatprg' 'fp'	string (default "")
			global or local to buffer global-local
	The name of an external program that will be used to format the lines
	selected with the gq operator.  The program must take the input on
	stdin and produce the output on stdout.  The Unix program "fmt" is
	such a program.
	If the 'formatexpr' option is not empty it will be used instead.
	Otherwise, if 'formatprg' option is an empty string, the internal
	format function will be used C-indenting.
	Environment variables are expanded :set_env.  See option-backslash
	about including spaces and backslashes.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

					'fsync' 'fs' 'nofsync' 'nofs'
'fsync' 'fs'		boolean	(default on)
			global
	When on, the library function fsync() will be called after writing a
	file.  This will flush a file to disk, ensuring that it is safely
	written even on filesystems which do metadata-only journaling.  This
	will force the harddrive to spin up on Linux systems running in laptop
	mode, so it may be undesirable in some situations.  Be warned that
	turning this off increases the chances of data loss after a crash.  On
	systems without an fsync() implementation, this variable is always
	off.
	Also see 'swapsync' for controlling fsync() on swap files.
	'fsync' also applies to writefile() (unless a flag is used to
	overrule it) and when writing undo files (see undo-persistence).
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

			    'fullscreen' 'fu' 'nofullscreen' 'nofu'
'fullscreen' 'fu'	boolean (default off)
			global
			{not in Vi}
			{only in MacVim GUI}
	When this option is set, the whole screen is covered by Vim.  Screen
	decorations drawn by the operating system (such as the dock or the
	menu bar) are hidden.  Most of Vim's window chrome is hidden as well
	(e.g. toolbar, title bar).  The tab bar and scroll bars remain visible.
	Updates to the window position are ignored in fullscreen mode.

	By default, this will use macOS's native full screen feature, which
	will put the MacVim window into another Space under Mission Control.
	MacVim also provides a custom full screen solution which you can
	select by setting MMNativeFullScreen to NO, or toggle it under
	Preferences → Appearance. Under custom full-screen, the window will
	not be put in another space, which makes it easier to Cmd-Tab to other
	windows.

	Custom / non-native full screen configuration:

	See 'fuoptions' for how Vim resizes and colors the background when
	entering and leaving fullscreen mode.

	There is an optional fade-to-black effect while transitioning that
	could be turned on by using the hidden preference
	MMFullScreenFadeTime (specified in seconds). It defaults to 0,
	meaning this effect is turned off.  Setting it to a positive value
	(e.g. 0.25) will create an effect that fades to black during the full
	screen transition to make it less jarring.

	Note: While in 'fullscreen', you cannot set 'lines' or 'columns', as
	they are determined by the size of the window.  'fuoptions' allows you
	to override part of that behavior if using custom full screen.

						'fuoptions' 'fuopt'
'fuoptions' 'fuopt'	string (default "maxvert,maxhorz")
			global
			{not in Vi}
			{only in MacVim GUI}
			{not supported in native full screen mode}
	In non-native fullscreen mode, MacVim can be configured to either show
	all the content filling up the whole screen, or only use part of the
	screen to show the content, centered.  This option controls the size
	of the Vim control as well as the color of the unused screen area.  It
	is a comma-separated list of values as follows:

	value	effect	
        maxvert	When entering fullscreen, 'lines' is set to the maximum number
		of lines fitting on the screen in fullscreen mode. If unset,
		'lines' will be unchanged when entering fullscreen mode.
        maxhorz	When entering fullscreen, 'columns' is set to the maximum number
		of columns fitting on the screen in fullscreen mode. If unset,
		'columns' will be unchanged when entering fullscreen mode.
	background:color
		When entering fullscreen, 'color' defines the color of the part
		of the screen that is not occupied by the Vim control. If
		'color' is an 8-digit hexadecimal number preceded by '#',
		it is interpreted as an explicit color value '#aarrggbb', with
		one byte each for the alpha, red, green, and blue values.
		Otherwise, 'color' is interpreted as a highlight group name,
		and the fullscreen background is filled with that highlight
		group's background color, as defined by the current color
		scheme.

	Examples:
	Don't change size when entering fullscreen: 
	  :set fuoptions=
	Only maximize vertically when entering fullscreen: 
	  :set fuoptions=maxvert
	Maximize only vertically when entering fullscreen, and color the
	background dark blue: 
	  :set fuoptions=maxvert,background:#FF003042
	Don't change size when entering fullscreen, and color the background
	like the current text background: 
	  :set fuoptions=background:Normal

				   'gdefault' 'gd' 'nogdefault' 'nogd'
'gdefault' 'gd'		boolean	(default off)
			global
	When on, the ":substitute" flag 'g' is default on.  This means that
	all matches in a line are substituted instead of one.  When a 'g' flag
	is given to a ":substitute" command, this will toggle the substitution
	of all or one match.  See complex-change.

		command		'gdefault' on	'gdefault' off	
		:s///		  subst. all	  subst. one
		:s///g		  subst. one	  subst. all
		:s///gg		  subst. all	  subst. one

	NOTE: This option is reset when 'compatible' is set.
	Setting this option may break plugins that rely on the default
	behavior of the 'g' flag. This will also make the 'g' flag have the
	opposite effect of that documented in :s_g.
	This option is not used in Vim9 script.

						'grepformat' 'gfm'
'grepformat' 'gfm'	string	(default "%f:%l:%m,%f:%l%m,%f  %l%m")
			global
	Format to recognize for the ":grep" command output.
	This is a scanf-like string that uses the same format as the
	'errorformat' option: see errorformat.

						'grepprg' 'gp'
'grepprg' 'gp'		string	(default "grep -n ",
					Unix: "grep -n $* /dev/null",
					Win32: "findstr /n" or "grep -n",
						      VMS: "SEARCH/NUMBERS ")
			global or local to buffer global-local
	Program to use for the :grep command.  This option may contain '%'
	and '#' characters, which are expanded like when used in a command-
	line.  The placeholder "$*" is allowed to specify where the arguments
	will be included.  Environment variables are expanded :set_env.  See
	option-backslash about including spaces and backslashes.
	When your "grep" accepts the "-H" argument, use this to make ":grep"
	also work well with a single file: 
		:set grepprg=grep\ -nH
	Special value: When 'grepprg' is set to "internal" the :grep command
	works like :vimgrep, :lgrep like :lvimgrep, :grepadd like
	:vimgrepadd and :lgrepadd like :lvimgrepadd.
	See also the section :make_makeprg, since most of the comments there
	apply equally to 'grepprg'.
	For Win32, the default is "findstr /n" if "findstr.exe" can be found,
	otherwise it's "grep -n".
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

			'guicursor' 'gcr' E545 E546 E548 E549
'guicursor' 'gcr'	string	(default "n-v-c:block-Cursor/lCursor,
					ve:ver35-Cursor,
					o:hor50-Cursor,
					i-ci:ver25-Cursor/lCursor,
					r-cr:hor20-Cursor/lCursor,
					sm:block-Cursor
					-blinkwait175-blinkoff150-blinkon175",
				for Win32 console:
					"n-v-c:block,o:hor50,i-ci:hor15,
					r-cr:hor30,sm:block")
			global
			{only available when compiled with GUI enabled, and
			for Win32 console}
	This option tells Vim what the cursor should look like in different
	modes.  It fully works in the GUI.  In a Win32 console, only the
	height of the cursor can be changed.  This can be done by specifying a
	block cursor, or a percentage for a vertical or horizontal cursor.
	For a console the 't_SI', 't_SR', and 't_EI' escape sequences are
	used.

	The option is a comma-separated list of parts.  Each part consist of a
	mode-list and an argument-list:
		mode-list:argument-list,mode-list:argument-list,..
	The mode-list is a dash separated list of these modes:
		n	Normal mode
		v	Visual mode
		ve	Visual mode with 'selection' "exclusive" (same as 'v',
			if not specified)
		o	Operator-pending mode
		i	Insert mode
		r	Replace mode
		c	Command-line Normal (append) mode
		ci	Command-line Insert mode
		cr	Command-line Replace mode
		sm	showmatch in Insert mode
		a	all modes
	The argument-list is a dash separated list of these arguments:
		hor{N}	horizontal bar, {N} percent of the character height
		ver{N}	vertical bar, {N} percent of the character width
		block	block cursor, fills the whole character
			[only one of the above three should be present]
		blinkwait{N}				cursor-blinking
		blinkon{N}
		blinkoff{N}
			blink times for cursor: blinkwait is the delay before
			the cursor starts blinking, blinkon is the time that
			the cursor is shown and blinkoff is the time that the
			cursor is not shown.  The times are in msec.  When one
			of the numbers is zero, there is no blinking.  The
			default is: "blinkwait700-blinkon400-blinkoff250".
			These numbers are used for a missing entry.  This
			means that blinking is enabled by default.  To switch
			blinking off you can use "blinkon0".  The cursor only
			blinks when Vim is waiting for input, not while
			executing a command.
			To make the cursor blink in an xterm, see
			xterm-blink.
		{group-name}
			a highlight group name, that sets the color and font
			for the cursor
		{group-name}/{group-name}
			Two highlight group names, the first is used when
			no language mappings are used, the other when they
			are. language-mapping

	Examples of parts:
	   n-c-v:block-nCursor	in Normal, Command-line and Visual mode, use a
				block cursor with colors from the "nCursor"
				highlight group
	   i-ci:ver30-iCursor-blinkwait300-blinkon200-blinkoff150
				In Insert and Command-line Insert mode, use a
				30% vertical bar cursor with colors from the
				"iCursor" highlight group.  Blink a bit
				faster.

	The 'a' mode is different.  It will set the given argument-list for
	all modes.  It does not reset anything to defaults.  This can be used
	to do a common setting for all modes.  For example, to switch off
	blinking: "a:blinkon0"

	Examples of cursor highlighting: 
	    :highlight Cursor gui=reverse guifg=NONE guibg=NONE
	    :highlight Cursor gui=NONE guifg=bg guibg=fg

					'guifont' 'gfn'
						   E235 E596
'guifont' 'gfn'		string	(default "")
			global
			{only available when compiled with GUI enabled}
	This is a list of fonts which will be used for the GUI version of Vim.
	In its simplest form the value is just one font name.
	See gui-font for the details.

					'guifontset' 'gfs'
					E250 E252 E234 E597 E598
'guifontset' 'gfs'	string	(default "")
			global
			{only available when compiled with GUI enabled and
			with the +xfontset feature}
			{not available in the GTK+ GUI}
	When not empty, specifies two (or more) fonts to be used.  The first
	one for normal English, the second one for your special language.  See
	xfontset.

				'guifontwide' 'gfw' E231 E533 E534
'guifontwide' 'gfw'	string	(default "")
			global
			{only available when compiled with GUI enabled}
	When not empty, specifies a comma-separated list of fonts to be used
	for double-width characters.  The first font that can be loaded is
	used.  See gui-fontwide.

						'guiheadroom' 'ghr'
'guiheadroom' 'ghr'	number	(default 50)
			global
			{only for GTK and X11 GUI}
	The number of pixels subtracted from the screen height when fitting
	the GUI window on the screen.  Set this before the GUI is started,
	e.g., in your gvimrc file.  When zero, the whole screen height will
	be used by the window.  When positive, the specified number of pixel
	lines will be left for window decorations and other items on the
	screen.  Set it to a negative value to allow windows taller than the
	screen.

						'guiligatures' 'gli' E1243
'guiligatures' 'gli'	string	(default "")
			global
			{only for GTK GUI}
	List of ASCII characters that, when combined together, can create more
	complex shapes. Each character must be a printable ASCII character
	with a value in the 32-127 range.
	Example: 
		:set guiligatures=!\"#$%&()*+-./:<=>?@[]^_{\|~
	Changing this option updates screen output immediately. Set it to an
	empty string to disable ligatures.

						'guioptions' 'go'
'guioptions' 'go'	string	(default "egmrLtT"   (MS-Windows,
					   "t" is removed in defaults.vim),
					 "aegimrLtT" (GTK and Motif),
					 )
			global
			{only available when compiled with GUI enabled}
	This option only has an effect in the GUI version of Vim.  It is a
	sequence of letters which describes what components and options of the
	GUI should be used.
	To avoid problems with flags that are added in the future, use the
	"+=" and "-=" feature of ":set" add-option-flags.

	Valid characters are as follows:
								'go-!'
	  '!'	External commands are executed in a terminal window.  Without
		this flag the MS-Windows GUI will open a console window to
		execute the command.  The Unix GUI will simulate a dumb
		terminal to list the command output.
		The terminal window will be positioned at the bottom, and grow
		upwards as needed.
								'go-a'
	  'a'	Autoselect:  If present, then whenever VISUAL mode is started,
		or the Visual area extended, Vim tries to become the owner of
		the windowing system's global selection.  This means that the
		Visually highlighted text is available for pasting into other
		applications as well as into Vim itself.  When the Visual mode
		ends, possibly due to an operation on the text, or when an
		application wants to paste the selection, the highlighted text
		is automatically yanked into the "* selection register.
		Thus the selection is still available for pasting into other
		applications after the VISUAL mode has ended.
		    If not present, then Vim won't become the owner of the
		windowing system's global selection unless explicitly told to
		by a yank or delete operation for the "* register.
		The same applies to the modeless selection.
								'go-P'
	  'P'	Like autoselect but using the "+ register instead of the "*
		register.
								'go-A'
	  'A'	Autoselect for the modeless selection.  Like 'a', but only
		applies to the modeless selection.

		    'guioptions'   autoselect Visual  autoselect modeless 
			 ""		 -			 -
			 "a"		yes			yes
			 "A"		 -			yes
			 "aA"		yes			yes

		When using a terminal see the 'clipboard' option.

								'go-c'
	  'c'	Use console dialogs instead of popup dialogs for simple
		choices.
								'go-d'
	  'd'	Use dark theme variant if available. Currently only works for
		GTK+ GUI.
								'go-e'
	  'e'	Add tab pages when indicated with 'showtabline'.
		'guitablabel' can be used to change the text in the labels.
		When 'e' is missing a non-GUI tab pages line may be used.
		The GUI tabs are only supported on some systems, currently
		GTK, Motif, Mac OS/X, Haiku, and MS-Windows.
								'go-f'
	  'f'	Foreground: Don't use fork() to detach the GUI from the shell
		where it was started.  Use this for programs that wait for the
		editor to finish (e.g., an e-mail program).  Alternatively you
		can use "gvim -f" or ":gui -f" to start the GUI in the
		foreground.  gui-fork
		Note: Set this option in the vimrc file.  The forking may have
		happened already when the gvimrc file is read.
		MacVim does not support this flag due to limitations with
		forking on Mac OS X.
								'go-i'
	  'i'	Use a Vim icon.  For GTK with KDE it is used in the left-upper
		corner of the window.  It's black&white on non-GTK, because of
		limitations of X11.  For a color icon, see X11-icon.
								'go-m'
	  'm'	Menu bar is present.
								'go-M'
	  'M'	The system menu "$VIMRUNTIME/menu.vim" is not sourced.  Note
		that this flag must be added in the .vimrc file, before
		switching on syntax or filetype recognition (when the gvimrc
		file is sourced the system menu has already been loaded; the
		`:syntax on` and `:filetype on` commands load the menu too).
								'go-g'
	  'g'	Grey menu items: Make menu items that are not active grey.  If
		'g' is not included inactive menu items are not shown at all.
								'go-t'
	  't'	Include tearoff menu items.  Currently only works for Win32,
		GTK+ and Motif 1.2 GUI.
								'go-T'
	  'T'	Include Toolbar.  Currently only in Win32, GTK+, Motif,
		Photon and MacVim GUIs.
								'go-r'
	  'r'	Right-hand scrollbar is always present.
								'go-R'
	  'R'	Right-hand scrollbar is present when there is a vertically
		split window.
								'go-l'
	  'l'	Left-hand scrollbar is always present.
								'go-L'
	  'L'	Left-hand scrollbar is present when there is a vertically
		split window.
								'go-b'
	  'b'	Bottom (horizontal) scrollbar is present.  Its size depends on
		the longest visible line, or on the cursor line if the 'h'
		flag is included. gui-horiz-scroll
								'go-h'
	  'h'	Limit horizontal scrollbar size to the length of the cursor
		line.  Reduces computations. gui-horiz-scroll

	And yes, you may even have scrollbars on the left AND the right if
	you really want to :-).  See gui-scrollbars for more information.

								'go-v'
	  'v'	Use a vertical button layout for dialogs.  When not included,
		a horizontal layout is preferred, but when it doesn't fit a
		vertical layout is used anyway.  Not supported in GTK 3.
								'go-p'
	  'p'	Use Pointer callbacks for X11 GUI.  This is required for some
		window managers.  If the cursor is not blinking or hollow at
		the right moment, try adding this flag.  This must be done
		before starting the GUI.  Set it in your gvimrc.  Adding or
		removing it after the GUI has started has no effect.
								'go-F'
	  'F'	Add a footer.  Only for Motif.  See gui-footer.
								'go-k'
	  'k'	Keep the GUI window size when adding/removing a scrollbar, or
		toolbar, tabline, etc.  Instead, the behavior is similar to
		when the window is maximized and will adjust 'lines' and
		'columns' to fit to the window.  Without the 'k' flag Vim will
		try to keep 'lines' and 'columns' the same when adding and
		removing GUI components.

						'guipty' 'noguipty'
'guipty'		boolean	(default on)
			global
			{only available when compiled with GUI enabled}
	Only in the GUI: If on, an attempt is made to open a pseudo-tty for
	I/O to/from shell commands.  See gui-pty.

						'guitablabel' 'gtl'
'guitablabel' 'gtl'	string	(default empty)
			global
			{only available when compiled with GUI enabled}
	When non-empty describes the text to use in a label of the GUI tab
	pages line.  When empty and when the result is empty Vim will use a
	default label.  See setting-guitablabel for more info.

	The format of this option is like that of 'statusline'.
	'guitabtooltip' is used for the tooltip, see below.
	The expression will be evaluated in the sandbox when set from a
	modeline, see sandbox-option.
	This option cannot be set in a modeline when 'modelineexpr' is off.

	Only used when the GUI tab pages line is displayed.  'e' must be
	present in 'guioptions'.  For the non-GUI tab pages line 'tabline' is
	used.

						'guitabtooltip' 'gtt'
'guitabtooltip' 'gtt'	string	(default empty)
			global
			{only available when compiled with GUI enabled}
	When non-empty describes the text to use in a tooltip for the GUI tab
	pages line.  When empty Vim will use a default tooltip.
	This option is otherwise just like 'guitablabel' above.
	You can include a line break.  Simplest method is to use :let: 
		:let &guitabtooltip = "line one\nline two"


						'helpfile' 'hf'
'helpfile' 'hf'		string	(default (MS-Windows) "$VIMRUNTIME\doc\help.txt"
					 (others) "$VIMRUNTIME/doc/help.txt")
			global
	Name of the main help file.  All distributed help files should be
	placed together in one directory.  Additionally, all "doc" directories
	in 'runtimepath' will be used.
	Environment variables are expanded :set_env.  For example:
	"$VIMRUNTIME/doc/help.txt".  If $VIMRUNTIME is not set, $VIM is also
	tried.  Also see $VIMRUNTIME and option-backslash about including
	spaces and backslashes.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'helpheight' 'hh'
'helpheight' 'hh'	number	(default 20)
			global
	Minimal initial height of the help window when it is opened with the
	":help" command.  The initial height of the help window is half of the
	current window, or (when the 'ea' option is on) the same as other
	windows.  When the height is less than 'helpheight', the height is
	set to 'helpheight'.  Set to zero to disable.

						'helplang' 'hlg'
'helplang' 'hlg'	string	(default: messages language or empty)
			global
			{only available when compiled with the +multi_lang
			feature}
	Comma-separated list of languages.  Vim will use the first language
	for which the desired help can be found.  The English help will always
	be used as a last resort.  You can add "en" to prefer English over
	another language, but that will only find tags that exist in that
	language and not in the English help.
	Example: 
		:set helplang=de,it
	This will first search German, then Italian and finally English help
	files.
	When using CTRL-] and ":help!" in a non-English help file Vim will
	try to find the tag in the current language before using this option.
	See help-translated.

				     'hidden' 'hid' 'nohidden' 'nohid'
'hidden' 'hid'		boolean	(default off)
			global
	When off a buffer is unloaded when it is abandoned.  When on a
	buffer becomes hidden when it is abandoned.  If the buffer is still
	displayed in another window, it does not become hidden, of course.

	The commands that move through the buffer list sometimes make a buffer
	hidden even if the 'hidden' option is off when these three are true:
	- the buffer is modified
	- 'autowrite' is off or writing is not possible
	- the '!' flag was used
	Also see windows.txt.

	To only make one buffer hidden use the 'bufhidden' option.
	This option is set for one command with ":hide {command}" :hide.
	WARNING: It's easy to forget that you have changes in hidden buffers.
	Think twice when using ":q!" or ":qa!".

						'highlight' 'hl'
'highlight' 'hl'	string	(default (as a single string):
				     "8:SpecialKey,~:EndOfBuffer,@:NonText,
				     d:Directory,e:ErrorMsg,i:IncSearch,
				     l:Search,m:MoreMsg,M:ModeMsg,n:LineNr,
				     a:LineNrAbove,b:LineNrBelow,
				     N:CursorLineNr,r:Question,s:StatusLine,
				     S:StatusLineNC,c:VertSplit,t:Title,
				     v:Visual,V:VisualNOS,w:WarningMsg,
				     W:WildMenu,f:Folded,F:FoldColumn,
				     A:DiffAdd,C:DiffChange,D:DiffDelete,
				     T:DiffText,>:SignColumn,-:Conceal,
				     B:SpellBad,P:SpellCap,R:SpellRare,
				     L:SpellLocal,+:Pmenu,=:PmenuSel,
				     [:PmenuKind,]:PmenuKindSel,
				     {:PmenuExtra,}:PmenuExtraSel,
				     x:PmenuSbar,X:PmenuThumb,*:TabLine,
				     #:TabLineSel,_:TabLineFill,!:CursorColumn,
				     .:CursorLine,o:ColorColumn,q:QuickFixLine,
				     z:StatusLineTerm,Z:StatusLineTermNC")
			global
	This option can be used to set highlighting mode for various
	occasions.  It is a comma-separated list of character pairs.  The
	first character in a pair gives the occasion, the second the mode to
	use for that occasion.  The occasions are:
	hl-SpecialKey  	 8  Meta and special keys listed with ":map"
	hl-EndOfBuffer   ~  lines after the last line in the buffer
	hl-NonText  	 @  '@' at the end of the window and
			    characters from 'showbreak'
	hl-Directory  	 d  directories in CTRL-D listing and other special
			    things in listings
	hl-ErrorMsg  	 e  error messages
			 h  (obsolete, ignored)
	hl-IncSearch  	 i  'incsearch' highlighting
	hl-CurSearch  	 y  current instance of last search pattern
	hl-Search  	 l  last search pattern highlighting (see 'hlsearch')
	hl-MoreMsg  	 m  more-prompt
	hl-ModeMsg  	 M  Mode (e.g., "-- INSERT --")
	hl-LineNr  	 n  line number for ":number" and ":#" commands, and
			    when 'number' or 'relativenumber' option is set.
	hl-LineNrAbove   a  line number above the cursor for when the
			    'relativenumber' option is set.
	hl-LineNrBelow   b  line number below the cursor for when the
			    'relativenumber' option is set.
	hl-CursorLineNr  N like n for when 'cursorline' or 'relativenumber' is
			    set.
	hl-Question  	 r  hit-enter prompt and yes/no questions
	hl-StatusLine  	 s  status line of current window status-line
	hl-StatusLineNC  S  status lines of not-current windows
	hl-Title  	 t  Titles for output from ":set all", ":autocmd" etc.
	hl-VertSplit  	 c  column used to separate vertically split windows
	hl-Visual  	 v  Visual mode
	hl-VisualNOS  	 V  Visual mode when Vim does is "Not Owning the
			    Selection" Only X11 Gui's gui-x11 and
			    xterm-clipboard.
	hl-WarningMsg  	 w  warning messages
	hl-WildMenu  	 W  wildcard matches displayed for 'wildmenu'
	hl-Folded  	 f  line used for closed folds
	hl-FoldColumn  	 F  'foldcolumn'
	hl-DiffAdd  	 A  added line in diff mode
	hl-DiffChange  	 C  changed line in diff mode
	hl-DiffDelete  	 D  deleted line in diff mode
	hl-DiffText  	 T  inserted text in diff mode
	hl-SignColumn  	 >  column used for signs
	hl-Conceal  	 -  the placeholders used for concealed characters
			    (see 'conceallevel')
	hl-SpellBad  	 B  misspelled word spell
	hl-SpellCap  	 P  word that should start with capital spell
	hl-SpellRare  	 R  rare word spell
	hl-SpellLocal  	 L  word from other region spell
	hl-Pmenu  	 +  popup menu normal line
	hl-PmenuSel  	 =  popup menu selected line
	hl-PmenuKind  	 [  popup menu "kind" normal line
	hl-PmenuKindSel  ]  popup menu "kind" selected line
	hl-PmenuExtra  	 {  popup menu "extra" normal line
	hl-PmenuExtraSel }  popup menu "extra" selected line
	hl-PmenuSbar  	 x  popup menu scrollbar
	hl-PmenuThumb  	 X  popup menu scrollbar thumb

	The display modes are:
		r	reverse		(termcap entry "mr" and "me")
		i	italic		(termcap entry "ZH" and "ZR")
		b	bold		(termcap entry "md" and "me")
		s	standout	(termcap entry "so" and "se")
		u	underline	(termcap entry "us" and "ue")
		c	undercurl	(termcap entry "Us" and "Ce")
		2	double underline (termcap entry "Ds" and "Ce")
		d	dotted underline (termcap entry "ds" and "Ce")
		=	dashed underline (termcap entry "Ds" and "Ce")
		t	strikethrough	(termcap entry "Ts" and "Te")
		n	no highlighting
		-	no highlighting
		:	use a highlight group
	The default is used for occasions that are not included.
	If you want to change what the display modes do, see dos-colors
	for an example.
	When using the ':' display mode, this must be followed by the name of
	a highlight group.  A highlight group can be used to define any type
	of highlighting, including using color.  See :highlight on how to
	define one.  The default uses a different group for each occasion.
	See highlight-default for the default highlight groups.

						'history' 'hi'
'history' 'hi'		number	(Vim default: 50, Vi default: 0,
						 set to 200 in defaults.vim)
			global
	A history of ":" commands, and a history of previous search patterns
	is remembered.  This option decides how many entries may be stored in
	each of these histories (see cmdline-editing).
	The maximum value is 10000.
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

					 'hkmap' 'hk' 'nohkmap' 'nohk'
'hkmap' 'hk'		boolean (default off)
			global
			{only available when compiled with the +rightleft
			feature}
	When on, the keyboard is mapped for the Hebrew character set.
	Normally you would set 'allowrevins' and use CTRL-_ in insert mode to
	toggle this option.  See rileft.txt.
	NOTE: This option is reset when 'compatible' is set.

				 'hkmapp' 'hkp' 'nohkmapp' 'nohkp'
'hkmapp' 'hkp'		boolean (default off)
			global
			{only available when compiled with the +rightleft
			feature}
	When on, phonetic keyboard mapping is used.  'hkmap' must also be on.
	This is useful if you have a non-Hebrew keyboard.
	See rileft.txt.
	NOTE: This option is reset when 'compatible' is set.

				 'hlsearch' 'hls' 'nohlsearch' 'nohls'
'hlsearch' 'hls'	boolean	(default off)
			global
			{not available when compiled without the
			+extra_search feature}
	When there is a previous search pattern, highlight all its matches.
	The type of highlighting used can be set with the 'l' occasion in the
	'highlight' option.  This uses the "Search" highlight group by
	default.  Note that only the matching text is highlighted, any offsets
	are not applied.  If the "CurSearch" highlight group is set then the
	current match is highlighted with that.
	See also: 'incsearch' and :match.
	When you get bored looking at the highlighted matches, you can turn it
	off with :nohlsearch.  This does not change the option value, as
	soon as you use a search command, the highlighting comes back.
	'redrawtime' specifies the maximum time spent on finding matches.
	When the search pattern can match an end-of-line, Vim will try to
	highlight all of the matched text.  However, this depends on where the
	search starts.  This will be the first line in the window or the first
	line below a closed fold.  A match in a previous line which is not
	drawn may not continue in a newly drawn line.
	You can specify whether the highlight status is restored on startup
	with the 'h' flag in 'viminfo' viminfo-h.
	NOTE: This option is reset when 'compatible' is set.

						'icon' 'noicon'
'icon'			boolean	(default off, on when title can be restored)
			global
	When on, the icon text of the window will be set to the value of
	'iconstring' (if it is not empty), or to the name of the file
	currently being edited.  Only the last part of the name is used.
	Overridden by the 'iconstring' option.
	Only works if the terminal supports setting window icons (currently
	only X11 GUI and terminals with a non-empty 't_IS' option - these are
	Unix xterm and iris-ansi by default, where 't_IS' is taken from the
	builtin termcap).
	When Vim was compiled with HAVE_X11 defined, the original icon will be
	restored if possible X11.  See X11-icon for changing the icon on
	X11.
	For MS-Windows the icon can be changed, see windows-icon.

						'iconstring'
'iconstring'		string	(default "")
			global
	When this option is not empty, it will be used for the icon text of
	the window.  This happens only when the 'icon' option is on.
	Only works if the terminal supports setting window icon text
	(currently only X11 GUI and terminals with a non-empty 't_IS' option).
	Does not work for MS-Windows.
	When Vim was compiled with HAVE_X11 defined, the original icon will be
	restored if possible X11.
	When this option contains printf-style '%' items, they will be
	expanded according to the rules used for 'statusline'.  See
	'titlestring' for example settings.
	This option cannot be set in a modeline when 'modelineexpr' is off.
	{not available when compiled without the |+statusline| feature}

			'ignorecase' 'ic' 'noignorecase' 'noic'
'ignorecase' 'ic'	boolean	(default off)
			global
	Ignore case in search patterns, cmdline-completion, when
	searching in the tags file, and non-Vim9 expr-==.
	Also see 'smartcase' and 'tagcase'.
	Can be overruled by using "\c" or "\C" in the pattern, see
	/ignorecase.

						'imactivatefunc' 'imaf'
'imactivatefunc' 'imaf'	string (default "")
			global
	This option specifies a function that will be called to
	activate or deactivate the Input Method.  The value can be the name of
	a function, a lambda or a Funcref. See option-value-function for
	more information.
	It is not used in the MS-Windows GUI version.
	The expression will be evaluated in the sandbox when set from a
	modeline, see sandbox-option.

	Example: 
		function ImActivateFunc(active)
		  if a:active
		    ... do something
		  else
		    ... do something
		  endif
		  " return value is not used
		endfunction
		set imactivatefunc=ImActivateFunc

						'imactivatekey' 'imak'
'imactivatekey' 'imak'	string (default "")
			global
			{only available when compiled with +xim and
			+GUI_GTK}  				E599
	Specifies the key that your Input Method in X-Windows uses for
	activation.  When this is specified correctly, vim can fully control
	IM with 'imcmdline', 'iminsert' and 'imsearch'.
	You can't use this option to change the activation key, the option
	tells Vim what the key is.
	Format:
		[MODIFIER_FLAG-]KEY_STRING

	These characters can be used for MODIFIER_FLAG (case is ignored):
		S	    Shift key
		L	    Lock key
		C	    Control key
		1	    Mod1 key
		2	    Mod2 key
		3	    Mod3 key
		4	    Mod4 key
		5	    Mod5 key
	Combinations are allowed, for example "S-C-space" or "SC-space" are
	both shift+ctrl+space.
	See <X11/keysymdef.h> and XStringToKeysym for KEY_STRING.

	Example: 
		:set imactivatekey=S-space
	"S-space" means shift+space.  This is the activation key for kinput2 +
	canna (Japanese), and ami (Korean).

				'imcmdline' 'imc' 'noimcmdline' 'noimc'
'imcmdline' 'imc'	boolean (default off)
			global
	When set the Input Method is always on when starting to edit a command
	line, unless entering a search pattern (see 'imsearch' for that).
	Setting this option is useful when your input method allows entering
	English characters directly, e.g., when it's used to type accented
	characters with dead keys.

				'imdisable' 'imd' 'noimdisable' 'noimd'
'imdisable' 'imd'	boolean (default off, on for some systems (SGI))
			global
	When set the Input Method is never used.  This is useful to disable
	the IM when it doesn't work properly.
	Currently this option is on by default for SGI/IRIX.  This may change
	in later releases.

						'iminsert' 'imi'
'iminsert' 'imi'	number (default 0)
			local to buffer
	Specifies whether :lmap or an Input Method (IM) is to be used in
	Insert mode.  Valid values:
		0	:lmap is off and IM is off
		1	:lmap is ON and IM is off
		2	:lmap is off and IM is ON
	To always reset the option to zero when leaving Insert mode with <Esc>
	this can be used: 
		:inoremap <ESC> <ESC>:set iminsert=0<CR>
	This makes :lmap and IM turn off automatically when leaving Insert
	mode.
	Note that this option changes when using CTRL-^ in Insert mode
	i_CTRL-^.
	The value is set to 1 when setting 'keymap' to a valid keymap name.
	It is also used for the argument of commands like "r" and "f".
	The value 0 may not work correctly with Motif with some XIM
	methods.  Use 'imdisable' to disable XIM then.

	You can set 'imactivatefunc' and 'imstatusfunc' to handle IME/XIM
	via external command if Vim is not compiled with the +xim,
	+multi_byte_ime or global-ime.

						'imsearch' 'ims'
'imsearch' 'ims'	number (default -1)
			local to buffer
	Specifies whether :lmap or an Input Method (IM) is to be used when
	entering a search pattern.  Valid values:
		-1	the value of 'iminsert' is used, makes it look like
			'iminsert' is also used when typing a search pattern
		0	:lmap is off and IM is off
		1	:lmap is ON and IM is off
		2	:lmap is off and IM is ON
	Note that this option changes when using CTRL-^ in Command-line mode
	c_CTRL-^.
	The value is set to 1 when it is not -1 and setting the 'keymap'
	option to a valid keymap name.
	The value 0 may not work correctly with Motif with some XIM
	methods.  Use 'imdisable' to disable XIM then.

						'imstatusfunc' 'imsf'
'imstatusfunc' 'imsf'	string (default "")
			global
	This option specifies a function that is called to obtain the status
	of Input Method.  It must return a positive number when IME is active.
	The value can be the name of a function, a lambda or a Funcref.
	See option-value-function for more information.
	It is not used in the MS-Windows GUI version.

	Example: 
		function ImStatusFunc()
		  let is_active = ...do something
		  return is_active ? 1 : 0
		endfunction
		set imstatusfunc=ImStatusFunc

	NOTE: This function is invoked very often.  Keep it fast.
	The expression will be evaluated in the sandbox when set from a
	modeline, see sandbox-option.

						'imstyle' 'imst'
'imstyle' 'imst'	number (default 1)
			global
			{only available when compiled with +xim and
			+GUI_GTK}
	This option specifies the input style of Input Method:
	0   use on-the-spot style
	1   over-the-spot style
	See: xim-input-style

	For a long time on-the-spot style had been used in the GTK version of
	vim, however, it is known that it causes troubles when using mappings,
	single-repeat, etc.  Therefore over-the-spot style becomes the
	default now.  This should work fine for most people, however if you
	have any problem with it, try using on-the-spot style.
	The expression will be evaluated in the sandbox when set from a
	modeline, see sandbox-option.

						'include' 'inc'
'include' 'inc'		string	(default "^\s*#\s*include")
			global or local to buffer global-local
			{not available when compiled without the
			+find_in_path feature}
	Pattern to be used to find an include command.  It is a search
	pattern, just like for the "/" command (See pattern).  The default
	value is for C programs.  This option is used for the commands "[i",
	"]I", "[d", etc.
	Normally the 'isfname' option is used to recognize the file name that
	comes after the matched pattern.  But if "\zs" appears in the pattern
	then the text matched from "\zs" to the end, or until "\ze" if it
	appears, is used as the file name.  Use this to include characters
	that are not in 'isfname', such as a space.  You can then use
	'includeexpr' to process the matched text.
	See option-backslash about including spaces and backslashes.

						'includeexpr' 'inex'
'includeexpr' 'inex'	string	(default "")
			local to buffer
			{not available when compiled without the
			+find_in_path or +eval features}
	Expression to be used to transform the string found with the 'include'
	option to a file name.  Mostly useful to change "." to "/" for Java: 
		:setlocal includeexpr=substitute(v:fname,'\\.','/','g')
	The "v:fname" variable will be set to the file name that was detected.
	Note the double backslash: the :set command first halves them, then
	one remains it the value, where "\." matches a dot literally.  For
	simple character replacements tr() avoids the need for escaping: 
		:setlocal includeexpr=tr(v:fname,'.','/')

	Also used for the gf command if an unmodified file name can't be
	found.  Allows doing "gf" on the name after an 'include' statement.
	Also used for <cfile>.

	If the expression starts with s: or <SID>, then it is replaced with
	the script ID (local-function). Example: 
		setlocal includeexpr=s:MyIncludeExpr()
		setlocal includeexpr=<SID>SomeIncludeExpr()
	Otherwise, the expression is evaluated in the context of the script
	where the option was set, thus script-local items are available.

	It is more efficient if the value is just a function call without
	arguments, see expr-option-function.

	The expression will be evaluated in the sandbox when set from a
	modeline, see sandbox-option.
	This option cannot be set in a modeline when 'modelineexpr' is off.

	It is not allowed to change text or jump to another window while
	evaluating 'includeexpr' textlock.

				 'incsearch' 'is' 'noincsearch' 'nois'
'incsearch' 'is'	boolean	(default off, set in defaults.vim if the
					    +reltime feature is supported)
			global
			{not available when compiled without the
			+extra_search features}
	While typing a search command, show where the pattern, as it was typed
	so far, matches.  The matched string is highlighted.  If the pattern
	is invalid or not found, nothing is shown.  The screen will be updated
	often, this is only useful on fast terminals.
	Also applies to the pattern in commands: 
		:global
		:lvimgrep
		:lvimgrepadd
		:smagic
		:snomagic
		:sort
		:substitute
		:vglobal
		:vimgrep
		:vimgrepadd
	Note that the match will be shown, but the cursor will return to its
	original position when no match is found and when pressing <Esc>.  You
	still need to finish the search command with <Enter> to move the
	cursor to the match.
	You can use the CTRL-G and CTRL-T keys to move to the next and
	previous match. c_CTRL-G c_CTRL-T
	When compiled with the +reltime feature Vim only searches for about
	half a second.  With a complicated pattern and/or a lot of text the
	match may not be found.  This is to avoid that Vim hangs while you
	are typing the pattern.
	The highlighting can be set with the 'i' flag in 'highlight'.
	When 'hlsearch' is on, all matched strings are highlighted too while
	typing a search command. See also: 'hlsearch'.
	If you don't want to turn 'hlsearch' on, but want to highlight all
	matches while searching, you can turn on and off 'hlsearch' with
	autocmd.  Example: 
		augroup vimrc-incsearch-highlight
		  autocmd!
		  autocmd CmdlineEnter /,\? :set hlsearch
		  autocmd CmdlineLeave /,\? :set nohlsearch
		augroup END

	CTRL-L can be used to add one character from after the current match
	to the command line.  If 'ignorecase' and 'smartcase' are set and the
	command line has no uppercase characters, the added character is
	converted to lowercase.
	CTRL-R CTRL-W can be used to add the word at the end of the current
	match, excluding the characters that were already typed.
	NOTE: This option is reset when 'compatible' is set.

						'indentexpr' 'inde'
'indentexpr' 'inde'	string	(default "")
			local to buffer
			{not available when compiled without the +eval
			feature}
	Expression which is evaluated to obtain the proper indent for a line.
	It is used when a new line is created, for the = operator and
	in Insert mode as specified with the 'indentkeys' option.
	When this option is not empty, it overrules the 'cindent' and
	'smartindent' indenting.  When 'lisp' is set, this option is
	is only used when 'lispoptions' contains "expr:1".
	When 'paste' is set this option is not used for indenting.
	The expression is evaluated with v:lnum set to the line number for
	which the indent is to be computed.  The cursor is also in this line
	when the expression is evaluated (but it may be moved around).

	If the expression starts with s: or <SID>, then it is replaced with
	the script ID (local-function). Example: 
		set indentexpr=s:MyIndentExpr()
		set indentexpr=<SID>SomeIndentExpr()
	Otherwise, the expression is evaluated in the context of the script
	where the option was set, thus script-local items are available.

	The advantage of using a function call without arguments is that it is
	faster, see expr-option-function.

	The expression must return the number of spaces worth of indent.  It
	can return "-1" to keep the current indent (this means 'autoindent' is
	used for the indent).
	Functions useful for computing the indent are indent(), cindent()
	and lispindent().
	The evaluation of the expression must not have side effects!  It must
	not change the text, jump to another window, etc.  Afterwards the
	cursor position is always restored, thus the cursor may be moved.
	Normally this option would be set to call a function: 
		:set indentexpr=GetMyIndent()
	Error messages will be suppressed, unless the 'debug' option contains
	"msg".
	See indent-expression.
	NOTE: This option is set to "" when 'compatible' is set.

	The expression will be evaluated in the sandbox when set from a
	modeline, see sandbox-option.
	This option cannot be set in a modeline when 'modelineexpr' is off.

	It is not allowed to change text or jump to another window while
	evaluating 'indentexpr' textlock.

						'indentkeys' 'indk'
'indentkeys' 'indk'	string	(default "0{,0},0),0],:,0#,!^F,o,O,e")
			local to buffer
	A list of keys that, when typed in Insert mode, cause reindenting of
	the current line.  Only happens if 'indentexpr' isn't empty.
	The format is identical to 'cinkeys', see indentkeys-format.
	See C-indenting and indent-expression.

			'infercase' 'inf' 'noinfercase' 'noinf'
'infercase' 'inf'	boolean	(default off)
			local to buffer
	When doing keyword completion in insert mode ins-completion, and
	'ignorecase' is also on, the case of the match is adjusted depending
	on the typed text.  If the typed text contains a lowercase letter
	where the match has an upper case letter, the completed part is made
	lowercase.  If the typed text has no lowercase letters and the match
	has a lowercase letter where the typed text has an uppercase letter,
	and there is a letter before it, the completed part is made uppercase.
	With 'noinfercase' the match is used as-is.

			'insertmode' 'im' 'noinsertmode' 'noim'
'insertmode' 'im'	boolean	(default off)
			global
	Makes Vim work in a way that Insert mode is the default mode.  Useful
	if you want to use Vim as a modeless editor.  Used for evim.
	These Insert mode commands will be useful:
	- Use the cursor keys to move around.
	- Use CTRL-O to execute one Normal mode command i_CTRL-O.  When
	  this is a mapping, it is executed as if 'insertmode' was off.
	  Normal mode remains active until the mapping is finished.
	- Use CTRL-L to execute a number of Normal mode commands, then use
	  <Esc> to get back to Insert mode.  Note that CTRL-L moves the cursor
	  left, like <Esc> does when 'insertmode' isn't set.  i_CTRL-L

	These items change when 'insertmode' is set:
	- when starting to edit of a file, Vim goes to Insert mode.
	- <Esc> in Insert mode is a no-op and beeps.
	- <Esc> in Normal mode makes Vim go to Insert mode.
	- CTRL-L in Insert mode is a command, it is not inserted.
	- CTRL-Z in Insert mode suspends Vim, see CTRL-Z.  	i_CTRL-Z
	However, when <Esc> is used inside a mapping, it behaves like
	'insertmode' was not set.  This was done to be able to use the same
	mappings with 'insertmode' set or not set.
	When executing commands with :normal 'insertmode' is not used.

	NOTE: This option is reset when 'compatible' is set.

						'isfname' 'isf'
'isfname' 'isf'		string	(default for Win32:
			     "@,48-57,/,\,.,-,_,+,,,#,$,%,{,},[,],:,@-@,!,~,="
			    for AMIGA: "@,48-57,/,.,-,_,+,,,$,:"
			    for VMS: "@,48-57,/,.,-,_,+,,,#,$,%,<,>,[,],:,;,~"
			    for OS/390: "@,240-249,/,.,-,_,+,,,#,$,%,~,="
			    otherwise: "@,48-57,/,.,-,_,+,,,#,$,%,~,=")
			global
	The characters specified by this option are included in file names and
	path names.  Filenames are used for commands like "gf", "[i" and in
	the tags file.  It is also used for "\f" in a pattern.
	Multi-byte characters 256 and above are always included, only the
	characters up to 255 are specified with this option.
	For UTF-8 the characters 0xa0 to 0xff are included as well.
	Think twice before adding white space to this option.  Although a
	space may appear inside a file name, the effect will be that Vim
	doesn't know where a file name starts or ends when doing completion.
	It most likely works better without a space in 'isfname'.

	Note that on systems using a backslash as path separator, Vim tries to
	do its best to make it work as you would expect.  That is a bit
	tricky, since Vi originally used the backslash to escape special
	characters.  Vim will not remove a backslash in front of a normal file
	name character on these systems, but it will on Unix and alikes.  The
	'&' and '^' are not included by default, because these are special for
	cmd.exe.

	The format of this option is a list of parts, separated with commas.
	Each part can be a single character number or a range.  A range is two
	character numbers with '-' in between.  A character number can be a
	decimal number between 0 and 255 or the ASCII character itself (does
	not work for digits).  Example:
		"_,-,128-140,#-43"	(include '_' and '-' and the range
					128 to 140 and '#' to 43)
	If a part starts with '^', the following character number or range
	will be excluded from the option.  The option is interpreted from left
	to right.  Put the excluded character after the range where it is
	included.  To include '^' itself use it as the last character of the
	option or the end of a range.  Example:
		"^a-z,#,^"	(exclude 'a' to 'z', include '#' and '^')
	If the character is '@', all characters where isalpha() returns TRUE
	are included.  Normally these are the characters a to z and A to Z,
	plus accented characters.  To include '@' itself use "@-@".  Examples:
		"@,^a-z"	All alphabetic characters, excluding lower
				case ASCII letters.
		"a-z,A-Z,@-@"	All letters plus the '@' character.
	A comma can be included by using it where a character number is
	expected.  Example:
		"48-57,,,_"	Digits, comma and underscore.
	A comma can be excluded by prepending a '^'.  Example:
		" -~,^,,9"	All characters from space to '~', excluding
				comma, plus <Tab>.
	See option-backslash about including spaces and backslashes.

						'isident' 'isi'
'isident' 'isi'		string	(default for Win32:
					   "@,48-57,_,128-167,224-235"
				otherwise: "@,48-57,_,192-255")
			global
	The characters given by this option are included in identifiers.
	Identifiers are used in recognizing environment variables and after a
	match of the 'define' option.  It is also used for "\i" in a
	pattern.  See 'isfname' for a description of the format of this
	option.  For '@' only characters up to 255 are used.
	Careful: If you change this option, it might break expanding
	environment variables.  E.g., when '/' is included and Vim tries to
	expand "$HOME/.viminfo".  Maybe you should change 'iskeyword' instead.

						'iskeyword' 'isk'
'iskeyword' 'isk'	string (Vim default for Win32:
					    "@,48-57,_,128-167,224-235"
				   otherwise:  "@,48-57,_,192-255"
				Vi default: "@,48-57,_")
			local to buffer
	Keywords are used in searching and recognizing with many commands:
	"w", "*", "[i", etc.  It is also used for "\k" in a pattern.  See
	'isfname' for a description of the format of this option.  For '@'
	characters above 255 check the "word" character class (any character
	that is not white space or punctuation).
	For C programs you could use "a-z,A-Z,48-57,_,.,-,>".
	For a help file it is set to all non-blank printable characters except
	'*', '"' and '|' (so that CTRL-] on a command finds the help for that
	command).
	When the 'lisp' option is on the '-' character is always included.
	This option also influences syntax highlighting, unless the syntax
	uses :syn-iskeyword.
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

						'isprint' 'isp'
'isprint' 'isp'	string	(default for Win32 and macOS:
				"@,~-255"; otherwise: "@,161-255")
			global
	The characters given by this option are displayed directly on the
	screen.  It is also used for "\p" in a pattern.  The characters from
	space (ASCII 32) to '~' (ASCII 126) are always displayed directly,
	even when they are not included in 'isprint' or excluded.  See
	'isfname' for a description of the format of this option.

	Non-printable characters are displayed with two characters:
		  0 -  31	"^@" - "^_"
		 32 - 126	always single characters
		   127		"^?"
		128 - 159	"~@" - "~_"
		160 - 254	"| " - "|~"
		   255		"~?"
	When 'encoding' is a Unicode one, illegal bytes from 128 to 255 are
	displayed as <xx>, with the hexadecimal value of the byte.
	When 'display' contains "uhex" all unprintable characters are
	displayed as <xx>.
	The SpecialKey highlighting will be used for unprintable characters.
	hl-SpecialKey

	Multi-byte characters 256 and above are always included, only the
	characters up to 255 are specified with this option.  When a character
	is printable but it is not available in the current font, a
	replacement character will be shown.
	Unprintable and zero-width Unicode characters are displayed as <xxxx>.
	There is no option to specify these characters.

			'joinspaces' 'js' 'nojoinspaces' 'nojs'
'joinspaces' 'js'	boolean	(default on)
			global
	Insert two spaces after a '.', '?' and '!' with a join command.
	When 'cpoptions' includes the 'j' flag, only do this after a '.'.
	Otherwise only one space is inserted.
	NOTE: This option is set when 'compatible' is set.

						'jumpoptions' 'jop'
'jumpoptions' 'jop'	string	(default "")
			global
	List of words that change the behavior of the jumplist.
	  stack         Make the jumplist behave like the tagstack.
			Relative location of entries in the jumplist is
			preserved at the cost of discarding subsequent entries
			when navigating backwards in the jumplist and then
			jumping to a location.  jumplist-stack

							'key'
'key'			string	(default "")
			local to buffer
			{only available when compiled with the +cryptv
			feature}
	The key that is used for encrypting and decrypting the current buffer.
	See encryption and 'cryptmethod'.
	Careful: Do not set the key value by hand, someone might see the typed
	key.  Use the :X command.  But you can make 'key' empty: 
		:set key=
	It is not possible to get the value of this option with ":set key" or
	"echo &key".  This is to avoid showing it to someone who shouldn't
	know.  It also means you cannot see it yourself once you have set it,
	be careful not to make a typing error!
	You also cannot use :set-=, :set+=, :set^= on this option to
	prevent an attacker from guessing substrings in your key.
	You can use "&key" in an expression to detect whether encryption is
	enabled.  When 'key' is set it returns "*****" (five stars).

					'keymap' 'kmp' E544
'keymap' 'kmp'		string	(default "")
			local to buffer
			{only available when compiled with the +keymap
			feature}
	Name of a keyboard mapping.  See mbyte-keymap.
	Setting this option to a valid keymap name has the side effect of
	setting 'iminsert' to one, so that the keymap becomes effective.
	'imsearch' is also set to one, unless it was -1
	Only normal file name characters can be used, "/\*?[|<>" are illegal.

					'keymodel' 'km'
'keymodel' 'km'		string	(default "")
			global
	List of comma-separated words, which enable special things that keys
	can do.  These values can be used:
	   startsel	Using a shifted special key starts selection (either
			Select mode or Visual mode, depending on "key" being
			present in 'selectmode').
	   stopsel	Using a not-shifted special key stops selection.
	Special keys in this context are the cursor keys, <End>, <Home>,
	<PageUp> and <PageDown>.
	The 'keymodel' option is set by the :behave command.

						'keyprotocol' 'kpc'
'keyprotocol' 'kpc'	string	(default: see below)
			global
	Specifies what keyboard protocol to use depending on the value of
	'term'.  The supported keyboard protocols names are:
		none	whatever the terminal uses
		mok2	modifyOtherKeys level 2, as supported by xterm
		kitty	Kitty keyboard protocol, as supported by Kitty

	The option value is a list of comma separated items.  Each item has
	a pattern that is matched against the 'term' option, a colon and the
	protocol name to be used.  To illustrate this, the default value would
	be set with: 
	   set keyprotocol=kitty:kitty,foot:kitty,wezterm:kitty,xterm:mok2

	This means that when 'term' contains "kitty, "foot" or "wezterm"
	somewhere then the "kitty" protocol is used.  When 'term' contains
	"xterm" somewhere, then the "mok2" protocol is used.

	The first match is used, thus if you want to have "kitty" use the
	kitty protocol, but "badkitty" not, then you should match "badkitty"
	first and use the "none" value: 
	   set keyprotocol=badkitty:none,kitty:kitty

	The option is used after 'term' has been changed.  First the termcap
	entries are set, possibly using the builtin list, see builtin-terms.
	Then this option is inspected and if there is a match and a protocol
	is specified the following happens:
		none	Nothing, the regular t_TE and t_TI values remain

		mok2	The t_TE value is changed to:
			    CSI >4;m	disables modifyOtherKeys
			The t_TI value is changed to:
			    CSI >4;2m	enables modifyOtherKeys
			    CSI ?4m	request the modifyOtherKeys state

		kitty	The t_TE value is changed to:
			    CSI >4;m	disables modifyOtherKeys
			    CSI =0;1u	disables the kitty keyboard protocol
			The t_TI value is changed to:
			    CSI =1;1u	enables the kitty keyboard protocol
			    CSI ?u	request kitty keyboard protocol state
			    CSI >c	request the termresponse

	If you notice problems, such as characters being displayed that
	disappear after CTRL-L, you might want to try making this option
	empty.  Then set the 'term' option to have it take effect: 
		set keyprotocol=
		let &term = &term


					'keywordprg' 'kp'
'keywordprg' 'kp'	string	(default "man" or "man -s",  DOS: ":help",
								  VMS: "help")
			global or local to buffer global-local
	Program to use for the K command.  Environment variables are
	expanded :set_env.  ":help" may be used to access the Vim internal
	help.  (Note that previously setting the global option to the empty
	value did this, which is now deprecated.)
	When the first character is ":", the command is invoked as a Vim
	Ex command with [count] added as an argument if it is not zero.
	When "man", "man -s" or an Ex command is used, Vim will automatically
	translate a count for the "K" command and pass it as the first
	argument.  For "man -s" the "-s" is removed when there is no count.
	See option-backslash about including spaces and backslashes.
	Example: 
		:set keywordprg=man\ -s
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

					'langmap' 'lmap' E357 E358
'langmap' 'lmap'	string	(default "")
			global
			{only available when compiled with the +langmap
			feature}
	This option allows switching your keyboard into a special language
	mode.  When you are typing text in Insert mode the characters are
	inserted directly.  When in Normal mode the 'langmap' option takes
	care of translating these special characters to the original meaning
	of the key.  This means you don't have to change the keyboard mode to
	be able to execute Normal mode commands.
	This is the opposite of the 'keymap' option, where characters are
	mapped in Insert mode.
	Also consider setting 'langremap' to off, to prevent 'langmap' from
	applying to characters resulting from a mapping.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

	Example (for Greek, in UTF-8):				greek  
	    :set langmap=ΑA,ΒB,ΨC,ΔD,ΕE,ΦF,ΓG,ΗH,ΙI,ΞJ,ΚK,ΛL,ΜM,ΝN,ΟO,ΠP,QQ,ΡR,ΣS,ΤT,ΘU,ΩV,WW,ΧX,ΥY,ΖZ,αa,βb,ψc,δd,εe,φf,γg,ηh,ιi,ξj,κk,λl,μm,νn,οo,πp,qq,ρr,σs,τt,θu,ωv,ςw,χx,υy,ζz
	Example (exchanges meaning of z and y for commands): 
	    :set langmap=zy,yz,ZY,YZ

	The 'langmap' option is a list of parts, separated with commas.  Each
	part can be in one of two forms:
	1.  A list of pairs.  Each pair is a "from" character immediately
	    followed by the "to" character.  Examples: "aA", "aAbBcC".
	2.  A list of "from" characters, a semi-colon and a list of "to"
	    characters.  Example: "abc;ABC"
	Example: "aA,fgh;FGH,cCdDeE"
	Special characters need to be preceded with a backslash.  These are
	";", ',', '"', '|' and backslash itself.

	This will allow you to activate vim actions without having to switch
	back and forth between the languages.  Your language characters will
	be understood as normal vim English characters (according to the
	langmap mappings) in the following cases:
	 o Normal/Visual mode (commands, buffer/register names, user mappings)
	 o Insert/Replace Mode: Register names after CTRL-R
	 o Insert/Replace Mode: Mappings
	Characters entered in Command-line mode will NOT be affected by
	this option.   Note that this option can be changed at any time
	allowing to switch between mappings for different languages/encodings.
	Use a mapping to avoid having to type it each time!

					'langmenu' 'lm'
'langmenu' 'lm'		string	(default "")
			global
			{only available when compiled with the +menu and
			+multi_lang features}
	Language to use for menu translation.  Tells which file is loaded
	from the "lang" directory in 'runtimepath': 
		"lang/menu_" .. &langmenu .. ".vim"
	(without the spaces).  For example, to always use the Dutch menus, no
	matter what $LANG is set to: 
		:set langmenu=nl_NL.ISO_8859-1
	When 'langmenu' is empty, v:lang is used.
	Only normal file name characters can be used, "/\*?[|<>" are illegal.
	If your $LANG is set to a non-English language but you do want to use
	the English menus: 
		:set langmenu=none
	This option must be set before loading menus, switching on filetype
	detection or syntax highlighting.  Once the menus are defined setting
	this option has no effect.  But you could do this: 
		:source $VIMRUNTIME/delmenu.vim
		:set langmenu=de_DE.ISO_8859-1
		:source $VIMRUNTIME/menu.vim
	Warning: This deletes all menus that you defined yourself!

			'langnoremap' 'lnr' 'nolangnoremap' 'nolnr'
'langnoremap' 'lnr'	boolean (default off, set in defaults.vim)
			global
			{only available when compiled with the +langmap
			feature}
	This is just like 'langremap' but with the value inverted.  It only
	exists for backwards compatibility.  When setting 'langremap' then
	'langnoremap' is set to the inverted value, and the other way around.

			'langremap' 'lrm' 'nolangremap' 'nolrm'
'langremap' 'lrm'	boolean (default on, set to off in defaults.vim)
			global
			{only available when compiled with the +langmap
			feature}
	When off, setting 'langmap' does not apply to characters resulting from
	a mapping.  This basically means, if you noticed that setting
	'langmap' disables some of your mappings, try resetting this option.
	This option defaults to on for backwards compatibility.  Set it off if
	that works for you to avoid mappings to break.

					'laststatus' 'ls'
'laststatus' 'ls'	number	(default 1)
			global
	The value of this option influences when the last window will have a
	status line:
		0: never
		1: only if there are at least two windows
		2: always
	The screen looks nicer with a status line if you have several
	windows, but it takes another screen line. status-line

			'lazyredraw' 'lz' 'nolazyredraw' 'nolz'
'lazyredraw' 'lz'	boolean	(default off)
			global
	When this option is set, the screen will not be redrawn while
	executing macros, registers and other commands that have not been
	typed.  Also, updating the window title is postponed.  To force an
	update use :redraw.
	This may occasionally cause display errors.  It is only meant to be set
	temporarily when performing an operation where redrawing may cause
	flickering or cause a slow down.

			'linebreak' 'lbr' 'nolinebreak' 'nolbr'
'linebreak' 'lbr'	boolean	(default off)
			local to window
			{not available when compiled without the +linebreak
			feature}
	If on, Vim will wrap long lines at a character in 'breakat' rather
	than at the last character that fits on the screen.  Unlike
	'wrapmargin' and 'textwidth', this does not insert <EOL>s in the file,
	it only affects the way the file is displayed, not its contents.
	If 'breakindent' is set, line is visually indented. Then, the value
	of 'showbreak' is used to put in front of wrapped lines. This option
	is not used when the 'wrap' option is off.
	Note that <Tab> characters after an <EOL> are mostly not displayed
	with the right amount of white space.

						'lines' E593
'lines'			number	(default 24 or terminal height)
			global
	Number of lines of the Vim window.
	Normally you don't need to set this.  It is done automatically by the
	terminal initialization code.  Also see posix-screen-size.
	When Vim is running in the GUI or in a resizable window, setting this
	option will cause the window size to be changed.  When you only want
	to use the size for the GUI, put the command in your gvimrc file.
	Vim limits the number of lines to what fits on the screen.  You can
	use this command to get the tallest window possible: 
		:set lines=999
	Minimum value is 2, maximum value is 1000.
	If you get fewer lines than expected, check the 'guiheadroom' option.
	When you set this option and Vim is unable to change the physical
	number of lines of the display, the display may be messed up.

						'linespace' 'lsp'
'linespace' 'lsp'	number	(default 0, 1 for Win32 GUI)
			global
			{only in the GUI}
	Number of pixel lines inserted between characters.  Useful if the font
	uses the full character cell height, making lines touch each other.
	When non-zero there is room for underlining.
	With some fonts there can be too much room between lines (to have
	space for ascents and descents).  Then it makes sense to set
	'linespace' to a negative value.  This may cause display problems
	though!

						'lisp' 'nolisp'
'lisp'			boolean	(default off)
			local to buffer
	Lisp mode: When <Enter> is typed in insert mode set the indent for
	the next line to Lisp standards (well, sort of).  Also happens with
	"cc" or "S".  'autoindent' must also be on for this to work.  The 'p'
	flag in 'cpoptions' changes the method of indenting: Vi compatible or
	better.  Also see 'lispwords'.
	The '-' character is included in keyword characters.  Redefines the
	"=" operator to use this same indentation algorithm rather than
	calling an external program if 'equalprg' is empty.
	This option is not used when 'paste' is set.

						'lispoptions' 'lop'
'lispoptions' 'lop'	string	(default "")
			local to buffer
	Comma-separated list of items that influence the Lisp indenting when
	enabled with the 'lisp' option.  Currently only one item is
	supported:
		expr:1	use 'indentexpr' for Lisp indenting when it is set
		expr:0	do not use 'indentexpr' for Lisp indenting (default)
	Note that when using 'indentexpr' the = operator indents all the
	lines, otherwise the first line is not indented (Vi-compatible).

						'lispwords' 'lw'
'lispwords' 'lw'	string	(default is very long)
			global or local to buffer global-local
	Comma-separated list of words that influence the Lisp indenting when
	enabled with the 'lisp' option.

						'list' 'nolist'
'list'			boolean	(default off)
			local to window
	List mode: By default show tabs as CTRL-I is displayed, display $
	after end of line.  Useful to see the difference between tabs and
	spaces and for trailing blanks.  Further changed by the 'listchars'
	option.

	The cursor is displayed at the start of the space a Tab character
	occupies, not at the end as usual in Normal mode.  To get this cursor
	position while displaying Tabs with spaces, use: 
		:set list lcs=tab:\ \ 

	Note that list mode will also affect formatting (set with 'textwidth'
	or 'wrapmargin') when 'cpoptions' includes 'L'.  See 'listchars' for
	changing the way tabs are displayed.

						'listchars' 'lcs'
'listchars' 'lcs'	string	(default "eol:$")
			global or local to window global-local
	Strings to use in 'list' mode and for the :list command.  It is a
	comma-separated list of string settings. E1511
							lcs-eol
	  eol:c		Character to show at the end of each line.  When
			omitted, there is no extra character at the end of the
			line.
							lcs-tab
	  tab:xy[z]	Two or three characters to be used to show a tab.
			The third character is optional.

	  tab:xy	The 'x' is always used, then 'y' as many times as will
			fit.  Thus "tab:>-" displays:
				>
				>-
				>--
				etc.

	  tab:xyz	The 'z' is always used, then 'x' is prepended, and
			then 'y' is used as many times as will fit.  Thus
			"tab:<->" displays:
				>
				<>
				<->
				<-->
				etc.

			When "tab:" is omitted, a tab is shown as ^I.
							lcs-space
	  space:c	Character to show for a space.  When omitted, spaces
			are left blank.
							lcs-multispace
	  multispace:c...
			One or more characters to use cyclically to show for
			multiple consecutive spaces.  Overrides the "space"
			setting, except for single spaces.  When omitted, the
			"space" setting is used.  For example,
			`:set listchars=multispace:---+` shows ten consecutive
			spaces as:
				---+---+-- 
							lcs-lead
	  lead:c	Character to show for leading spaces.  When omitted,
			leading spaces are blank.  Overrides the "space" and
			"multispace" settings for leading spaces.  You can
			combine it with "tab:", for example: 
				:set listchars+=tab:>-,lead:.
							lcs-leadmultispace
	  leadmultispace:c...
			Like the lcs-multispace value, but for leading
			spaces only.  Also overrides lcs-lead for leading
			multiple spaces.
			`:set listchars=leadmultispace:---+` shows ten
			consecutive leading spaces as:
				---+---+--XXX 
			Where "XXX" denotes the first non-blank characters in
			the line.
							lcs-trail
	  trail:c	Character to show for trailing spaces.  When omitted,
			trailing spaces are blank.  Overrides the "space" and
			"multispace" settings for trailing spaces.
							lcs-extends
	  extends:c	Character to show in the last column, when 'wrap' is
			off and the line continues beyond the right of the
			screen.
							lcs-precedes
	  precedes:c	Character to show in the first visible column of the
			physical line, when there is text preceding the
			character visible in the first column.
							lcs-conceal
	  conceal:c	Character to show in place of concealed text, when
			'conceallevel' is set to 1.
							lcs-nbsp
	  nbsp:c	Character to show for a non-breakable space character
			(0xA0 (160 decimal) and U+202F).  Left blank when
			omitted.

	The characters ':' and ',' should not be used.  UTF-8 characters can
	be used when 'encoding' is "utf-8", otherwise only printable
	characters are allowed.  All characters must be single width. E1512

	Each character can be specified as hex: 
		set listchars=eol:\\x24
		set listchars=eol:\\u21b5
		set listchars=eol:\\U000021b5
	Note that a double backslash is used.  The number of hex characters
	must be exactly 2 for \\x, 4 for \\u and 8 for \\U.

	Examples: 
	    :set lcs=tab:>-,trail:-
	    :set lcs=tab:>-,eol:<,nbsp:%
	    :set lcs=extends:>,precedes:<
	The "NonText" highlighting will be used for "eol", "extends" and
	"precedes".  "SpecialKey" will be used for "tab", "nbsp", "space",
	"multispace", "lead" and "trail".
	hl-NonText hl-SpecialKey

			'lpl' 'nolpl' 'loadplugins' 'noloadplugins'
'loadplugins' 'lpl'	boolean	(default on)
			global
	When on the plugin scripts are loaded when starting up load-plugins.
	This option can be reset in your vimrc file to disable the loading
	of plugins.
	Note that using the "-u NONE", "-u DEFAULTS" and "--noplugin" command
	line arguments reset this option.  See -u and --noplugin.

						'luadll'
'luadll'		string	(default depends on the build)
			global
			{only available when compiled with the +lua/dyn
			feature}
	Specifies the name of the Lua shared library. The default is
	DYNAMIC_LUA_DLL, which was specified at compile time.
	Environment variables are expanded :set_env.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'macatsui' 'nomacatsui'
'macatsui'		boolean	(default on)
			global
			{not supported}
	No longer supported, as the Mac OS X GUI code was removed.

				'macligatures' 'nomacligatures'
'macligatures'		boolean (default off)
			global
			{not in Vi}
                        {only available when compiled with GUI enabled on
			 Mac OS X}
	This option only has an effect in the GUI version of Vim on Mac OS X
	v10.5 or later.  When on, Vim will display ligatures if the selected
	'guifont' supports them. Examples for such fonts are Fira Code or
	Haskelig.
	Note: Currently this option only has an effect if
	'Use Core Text renderer' is enabled in the GUI preferences pane.

				'macthinstrokes' 'nomacthinstrokes'
'macthinstrokes'		boolean (default off)
			global
			{not in Vi}
                        {only available when compiled with GUI enabled on
			 Mac OS X}
	This option only has an effect in the GUI version of Vim on Mac OS X
	v10.8 or later.  When on, Vim will render the text a little lighter
	which looks nice with a dark colorscheme.
	Note: Currently this option only has an effect if
	'Use Core Text renderer' is enabled in the GUI preferences pane.

				'macmeta' 'mmta' 'nomacmeta' 'nommta'
'macmeta'		boolean	(default off)
			local to buffer
			{only available in MacVim GUI}
	Use option (alt) as meta key.  When on, option-key presses are not
	interpreted, thus enabling bindings to <M-..>.  When off, option-key
	presses are interpreted by the selected input method and inserted as
	text.
	Note: Some keys (e.g. <M-F1>, <M-Tab>, <M-Return>, <M-Left>) can be
	bound with the Meta flag even when this option is disabled, but this
	is not the case for the majority of keys (e.g. <M-a>, <M-`>).

						'magic' 'nomagic'
'magic'			boolean	(default on)
			global
	Changes the special characters that can be used in search patterns.
	See pattern.
	WARNING: Switching this option off most likely breaks plugins!  That
	is because many patterns assume it's on and will fail when it's off.
	Only switch it off when working with old Vi scripts.  In any other
	situation write patterns that work when 'magic' is on.  Include "\M"
	when you want to /\M.
	In Vim9 script the value of 'magic' is ignored, patterns behave like
	it is always set.

						'makeef' 'mef'
'makeef' 'mef'		string	(default: "")
			global
			{not available when compiled without the +quickfix
			feature}
	Name of the errorfile for the :make command (see :make_makeprg)
	and the :grep command.
	When it is empty, an internally generated temp file will be used.
	When "##" is included, it is replaced by a number to make the name
	unique.  This makes sure that the ":make" command doesn't overwrite an
	existing file.
	NOT used for the ":cf" command.  See 'errorfile' for that.
	Environment variables are expanded :set_env.
	See option-backslash about including spaces and backslashes.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

					'makeencoding' 'menc'
'makeencoding' 'menc'	string	(default "")
			global or local to buffer global-local
	Encoding used for reading the output of external commands.  When empty,
	encoding is not converted.
	This is used for :make, :lmake, :grep, :lgrep, :grepadd,
	:lgrepadd, :cfile, :cgetfile, :caddfile, :lfile, :lgetfile,
	and :laddfile.

	This would be mostly useful when you use MS-Windows and set 'encoding'
	to "utf-8".  If +iconv is enabled and GNU libiconv is used, setting
	'makeencoding' to "char" has the same effect as setting to the system
	locale encoding.  Example: 
		:set encoding=utf-8
		:set makeencoding=char	" system locale is used

						'makeprg' 'mp'
'makeprg' 'mp'		string	(default "make", VMS: "MMS")
			global or local to buffer global-local
	Program to use for the ":make" command.  See :make_makeprg.
	This option may contain '%' and '#' characters (see  :_% and :_#),
	which are expanded to the current and alternate file name.  Use ::S
	to escape file names in case they contain special characters.
	Environment variables are expanded :set_env.  See option-backslash
	about including spaces and backslashes.
	Note that a '|' must be escaped twice: once for ":set" and once for
	the interpretation of a command.  When you use a filter called
	"myfilter" do it like this: 
	    :set makeprg=gmake\ \\\|\ myfilter
	The placeholder "$*" can be given (even multiple times) to specify
	where the arguments will be included, for example: 
	    :set makeprg=latex\ \\\\nonstopmode\ \\\\input\\{$*}
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'matchpairs' 'mps'
'matchpairs' 'mps'	string	(default "(:),{:},[:]")
			local to buffer
	Characters that form pairs.  The % command jumps from one to the
	other.
	Only character pairs are allowed that are different, thus you cannot
	jump between two double quotes.
	The characters must be separated by a colon.
	The pairs must be separated by a comma.  Example for including '<' and
	'>' (for HTML): 
		:set mps+=<:>

	A more exotic example, to jump between the '=' and ';' in an
	assignment, useful for languages like C and Java: 
		:au FileType c,cpp,java set mps+==:;

	For a more advanced way of using "%", see the matchit.vim plugin in
	the $VIMRUNTIME/pack/dist/opt/matchit directory. add-local-help

						'matchtime' 'mat'
'matchtime' 'mat'	number	(default 5)
			global
	Tenths of a second to show the matching paren, when 'showmatch' is
	set.  Note that this is not in milliseconds, like other options that
	set a time.  This is to be compatible with Nvi.

						'maxcombine' 'mco'
'maxcombine' 'mco'	number (default 2)
			global
	The maximum number of combining characters supported for displaying.
	Only used when 'encoding' is "utf-8".
	The default is OK for most languages.  Hebrew may require 4.
	Maximum value is 6.
	Even when this option is set to 2 you can still edit text with more
	combining characters, you just can't see them.  Use g8 or ga.
	See mbyte-combining.

						'maxfuncdepth' 'mfd'
'maxfuncdepth' 'mfd'	number	(default 100)
			global
			{not available when compiled without the +eval
			feature}
	Maximum depth of function calls for user functions.  This normally
	catches endless recursion.  When using a recursive function with
	more depth, set 'maxfuncdepth' to a bigger number.  But this will use
	more memory, there is the danger of failing when memory is exhausted.
	Increasing this limit above 200 also changes the maximum for Ex
	command recursion, see E169.
	See also :function.
	Also used for maximum depth of callback functions.

						'maxmapdepth' 'mmd' E223
'maxmapdepth' 'mmd'	number	(default 1000)
			global
	Maximum number of times a mapping is done without resulting in a
	character to be used.  This normally catches endless mappings, like
	":map x y" with ":map y x".  It still does not catch ":map g wg",
	because the 'w' is used before the next mapping is done.  See also
	key-mapping.

						'maxmem' 'mm'
'maxmem' 'mm'		number	(default between 256 to 5120 (system
				 dependent) or half the amount of memory
				 available)
			global
	Maximum amount of memory (in Kbyte) to use for one buffer.  When this
	limit is reached allocating extra memory for a buffer will cause
	other memory to be freed.
	The maximum usable value is about 2000000.  Use this to work without a
	limit.
	The value is ignored when 'swapfile' is off.
	Also see 'maxmemtot'.

						'maxmempattern' 'mmp'
'maxmempattern' 'mmp'	number	(default 1000)
			global
	Maximum amount of memory (in Kbyte) to use for pattern matching.
	The maximum value is about 2000000.  Use this to work without a limit.
							E363
	When Vim runs into the limit it gives an error message and mostly
	behaves like CTRL-C was typed.
	Running into the limit often means that the pattern is very
	inefficient or too complex.  This may already happen with the pattern
	"\(.\)*" on a very long line.  ".*" works much better.
	Might also happen on redraw, when syntax rules try to match a complex
	text structure.
	Vim may run out of memory before hitting the 'maxmempattern' limit, in
	which case you get an "Out of memory" error instead.

						'maxmemtot' 'mmt'
'maxmemtot' 'mmt'	number	(default between 2048 and 10240 (system
				 dependent) or half the amount of memory
				 available)
			global
	Maximum amount of memory in Kbyte to use for all buffers together.
	The maximum usable value is about 2000000 (2 Gbyte).  Use this to work
	without a limit.
	On 64 bit machines higher values might work.  But hey, do you really
	need more than 2 Gbyte for text editing?  Keep in mind that text is
	stored in the swap file, one can edit files > 2 Gbyte anyway.  We do
	need the memory to store undo info.
	Buffers with 'swapfile' off still count to the total amount of memory
	used.
	Also see 'maxmem'.

						'menuitems' 'mis'
'menuitems' 'mis'	number	(default 25)
			global
			{not available when compiled without the +menu
			feature}
	Maximum number of items to use in a menu.  Used for menus that are
	generated from a list of items, e.g., the Buffers menu.  Changing this
	option has no direct effect, the menu must be refreshed first.

						'mkspellmem' 'msm'
'mkspellmem' 'msm'	string	(default "460000,2000,500")
			global
			{not available when compiled without the +syntax
			feature}
	Parameters for :mkspell.  This tunes when to start compressing the
	word tree.  Compression can be slow when there are many words, but
	it's needed to avoid running out of memory.  The amount of memory used
	per word depends very much on how similar the words are, that's why
	this tuning is complicated.

	There are three numbers, separated by commas:
		{start},{inc},{added}

	For most languages the uncompressed word tree fits in memory.  {start}
	gives the amount of memory in Kbyte that can be used before any
	compression is done.  It should be a bit smaller than the amount of
	memory that is available to Vim.

	When going over the {start} limit the {inc} number specifies the
	amount of memory in Kbyte that can be allocated before another
	compression is done.  A low number means compression is done after
	less words are added, which is slow.  A high number means more memory
	will be allocated.

	After doing compression, {added} times 1024 words can be added before
	the {inc} limit is ignored and compression is done when any extra
	amount of memory is needed.  A low number means there is a smaller
	chance of hitting the {inc} limit, less memory is used but it's
	slower.

	The languages for which these numbers are important are Italian and
	Hungarian.  The default works for when you have about 512 Mbyte.  If
	you have 1 Gbyte you could use: 
		:set mkspellmem=900000,3000,800
	If you have less than 512 Mbyte :mkspell may fail for some
	languages, no matter what you set 'mkspellmem' to.

	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

				   'modeline' 'ml' 'nomodeline' 'noml'
'modeline' 'ml'		boolean	(Vim default: on (off for root),
				 Vi default: off)
			local to buffer
	If 'modeline' is on 'modelines' gives the number of lines that is
	checked for set commands.  If 'modeline' is off or 'modelines' is zero
	no lines are checked.  See modeline.

			   'modelineexpr' 'mle' 'nomodelineexpr' 'nomle'
'modelineexpr' 'mle'	boolean (default: off)
			global
	When on allow some options that are an expression to be set in the
	modeline.  Check the option for whether it is affected by
	'modelineexpr'.  Also see modeline.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'modelines' 'mls'
'modelines' 'mls'	number	(default 5)
			global
	If 'modeline' is on 'modelines' gives the number of lines that is
	checked for set commands.  If 'modeline' is off or 'modelines' is zero
	no lines are checked.  See modeline.
	NOTE: 'modeline' is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

				'modifiable' 'ma' 'nomodifiable' 'noma'
				E21
'modifiable' 'ma'	boolean	(default on)
			local to buffer
	When off the buffer contents cannot be changed.  The 'fileformat' and
	'fileencoding' options also can't be changed.
	Can be reset on startup with the -M command line argument.

				'modified' 'mod' 'nomodified' 'nomod'
'modified' 'mod'	boolean	(default off)
			local to buffer  local-noglobal
	When on, the buffer is considered to be modified.  This option is set
	when:
	1. A change was made to the text since it was last written.  Using the
	   undo command to go back to the original text will reset the
	   option.  But undoing changes that were made before writing the
	   buffer will set the option again, since the text is different from
	   when it was written.
	2. 'fileformat' or 'fileencoding' is different from its original
	   value.  The original value is set when the buffer is read or
	   written.  A ":set nomodified" command also resets the original
	   values to the current values and the 'modified' option will be
	   reset.
	   Similarly for 'eol' and 'bomb'.
	This option is not set when a change is made to the buffer as the
	result of a BufNewFile, BufRead/BufReadPost, BufWritePost,
	FileAppendPost or VimLeave autocommand event.  See gzip-example for
	an explanation.
	When 'buftype' is "nowrite" or "nofile" this option may be set, but
	will be ignored.
	Note that the text may actually be the same, e.g. 'modified' is set
	when using "rA" on an "A".

						'more' 'nomore'
'more'			boolean	(Vim default: on, Vi default: off)
			global
	When on, listings pause when the whole screen is filled.  You will get
	the more-prompt.  When this option is off there are no pauses, the
	listing continues until finished.
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

						'mouse'
'mouse'			string	(default "", "a" for GUI and Win32,
					set to "a" or "nvi" in defaults.vim)
			global
	Enable the use of the mouse.  Works for most terminals (xterm, Win32
	win32-mouse, QNX pterm, *BSD console with sysmouse and Linux console
	with gpm).  For using the mouse in the GUI, see gui-mouse.  The
	mouse can be enabled for different modes:
		n	Normal mode and Terminal modes
		v	Visual mode
		i	Insert mode
		c	Command-line mode
		h	all previous modes when editing a help file
		a	all previous modes
		r	for hit-enter and more-prompt prompt
	Normally you would enable the mouse in all five modes with: 
		:set mouse=a
	If your terminal can't overrule the mouse events going to the
	application, use: 
		:set mouse=nvi
	Then you can press ":", select text for the system, and press Esc to go
	back to Vim using the mouse events.
	In defaults.vim "nvi" is used if the 'term' option is not matching
	"xterm".

	When the mouse is not enabled, the GUI will still use the mouse for
	modeless selection.  This doesn't move the text cursor.

	See mouse-using.  Also see 'clipboard'.

	Note: When enabling the mouse in a terminal, copy/paste will use the
	"* register if there is access to an X-server.  The xterm handling of
	the mouse buttons can still be used by keeping the shift key pressed.
	Also see the 'clipboard' option.

			'mousefocus' 'mousef' 'nomousefocus' 'nomousef'
'mousefocus' 'mousef'	boolean	(default off)
			global
			{only works in the GUI}
	The window that the mouse pointer is on is automatically activated.
	When changing the window layout or window focus in another way, the
	mouse pointer is moved to the window with keyboard focus.  Off is the
	default because it makes using the pull down menus a little goofy, as
	a pointer transit may activate a window unintentionally.
	MS-Windows: Also see 'scrollfocus' for what window is scrolled when
	using the mouse scroll wheel.

			'mousehide' 'mh' 'nomousehide' 'nomh'
'mousehide' 'mh'	boolean	(default on)
			global
			{only works in the GUI}
	When on, the mouse pointer is hidden when characters are typed.
	The mouse pointer is restored when the mouse is moved.

						'mousemodel' 'mousem'
'mousemodel' 'mousem'	string	(default "extend", "popup" for Win32)
			global
	Sets the model to use for the mouse.  The name mostly specifies what
	the right mouse button is used for:
	   extend	Right mouse button extends a selection.  This works
			like in an xterm.
	   popup	Right mouse button pops up a menu.  The shifted left
			mouse button extends a selection.  This works like
			with Microsoft Windows.
	   popup_setpos Like "popup", but the cursor will be moved to the
			position where the mouse was clicked, and thus the
			selected operation will act upon the clicked object.
			If clicking inside a selection, that selection will
			be acted upon, i.e. no cursor move.  This implies of
			course, that right clicking outside a selection will
			end Visual mode.
	Overview of what button does what for each model:
	mouse		    extend		popup(_setpos) 
	left click	    place cursor	place cursor
	left drag	    start selection	start selection
	shift-left	    search word		extend selection
	right click	    extend selection	popup menu (place cursor)
	right drag	    extend selection	-
	middle click	    paste		paste

	In the "popup" model the right mouse button produces a pop-up menu.
	You need to define this first, see popup-menu.

	Note that you can further refine the meaning of buttons with mappings.
	See gui-mouse-mapping.  But mappings are NOT used for modeless
	selection (because that's handled in the GUI code directly).

	The 'mousemodel' option is set by the :behave command.

	    'mousemoveevent' 'mousemev' 'nomousemoveevent' 'nomousemev'
'mousemoveevent' 'mousemev'  boolean	(default off)
			global
			{only works in the GUI}
	When on, mouse move events are delivered to the input queue and are
	available for mapping. The default, off, avoids the mouse movement
	overhead except when needed. See gui-mouse-mapping.
	Warning: Setting this option can make pending mappings to be aborted
	when the mouse is moved.
	Currently only works in the GUI, may be made to work in a terminal
	later.

					'mouseshape' 'mouses' E547
'mouseshape' 'mouses'	string	(default "i-r:beam,s:updown,sd:udsizing,
					vs:leftright,vd:lrsizing,m:no,
					ml:up-arrow,v:rightup-arrow")
			global
			{only available when compiled with the +mouseshape
			feature}
	This option tells Vim what the mouse pointer should look like in
	different modes.  The option is a comma-separated list of parts, much
	like used for 'guicursor'.  Each part consist of a mode/location-list
	and an argument-list:
		mode-list:shape,mode-list:shape,..
	The mode-list is a dash separated list of these modes/locations:
			In a normal window: 
		n	Normal mode
		v	Visual mode
		ve	Visual mode with 'selection' "exclusive" (same as 'v',
			if not specified)
		o	Operator-pending mode
		i	Insert mode
		r	Replace mode

			Others: 
		c	appending to the command-line
		ci	inserting in the command-line
		cr	replacing in the command-line
		m	at the 'Hit ENTER' or 'More' prompts
		ml	idem, but cursor in the last line
		e	any mode, pointer below last window
		s	any mode, pointer on a status line
		sd	any mode, while dragging a status line
		vs	any mode, pointer on a vertical separator line
		vd	any mode, while dragging a vertical separator line
		a	everywhere

	The shape is one of the following:
	avail	name		looks like 
	w x	arrow		Normal mouse pointer
	w x	blank		no pointer at all (use with care!)
	w x	beam		I-beam
	w x	updown		up-down sizing arrows
	w x	leftright	left-right sizing arrows
	w x	busy		The system's usual busy pointer
	w x	no		The system's usual 'no input' pointer
	  x	udsizing	indicates up-down resizing
	  x	lrsizing	indicates left-right resizing
	  x	crosshair	like a big thin +
	  x	hand1		black hand
	  x	hand2		white hand
	  x	pencil		what you write with
	  x	question	big ?
	  x	rightup-arrow	arrow pointing right-up
	w x	up-arrow	arrow pointing up
	  x	<number>	any X11 pointer number (see X11/cursorfont.h)

	The "avail" column contains a 'w' if the shape is available for Win32,
	x for X11.
	Any modes not specified or shapes not available use the normal mouse
	pointer.

	Example: 
		:set mouseshape=s:udsizing,m:no
	will make the mouse turn to a sizing arrow over the status lines and
	indicate no input when the hit-enter prompt is displayed (since
	clicking the mouse has no effect in this state.)

						'mousetime' 'mouset'
'mousetime' 'mouset'	number	(default 500)
			global
	Only for GUI, Win32 and Unix with xterm.  Defines the maximum
	time in msec between two mouse clicks for the second click to be
	recognized as a multi click.

						    'mzquantum' 'mzq'
'mzquantum' 'mzq'	number	(default 100)
			global
			{not available when compiled without the +mzscheme
			feature}
	The number of milliseconds between polls for MzScheme threads.
	Negative or zero value means no thread scheduling.
	NOTE: This option is set to the Vim default value when 'compatible'
	is reset.

						'mzschemedll'
'mzschemedll'		string	(default depends on the build)
			global
			{only available when compiled with the +mzscheme/dyn
			feature}
	Specifies the name of the MzScheme shared library. The default is
	DYNAMIC_MZSCH_DLL which was specified at compile time.
	Environment variables are expanded :set_env.
	The value must be set in the vimrc script or earlier.  In the
	startup, before the load-plugins step.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'mzschemegcdll'
'mzschemegcdll'		string	(default depends on the build)
			global
			{only available when compiled with the +mzscheme/dyn
			feature}
	Specifies the name of the MzScheme GC shared library. The default is
	DYNAMIC_MZGC_DLL which was specified at compile time.
	The value can be equal to 'mzschemedll' if it includes the GC code.
	Environment variables are expanded :set_env.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

							'nrformats' 'nf'
'nrformats' 'nf'	string	(default "bin,octal,hex",
					   set to "bin,hex" in defaults.vim)
			local to buffer
	This defines what bases Vim will consider for numbers when using the
	CTRL-A and CTRL-X commands for adding to and subtracting from a number
	respectively; see CTRL-A for more info on these commands.
	alpha	If included, single alphabetical characters will be
		incremented or decremented.  This is useful for a list with a
		letter index a), b), etc.		octal-nrformats
	octal	If included, numbers that start with a zero will be considered
		to be octal.  Example: Using CTRL-A on "007" results in "010".
	hex	If included, numbers starting with "0x" or "0X" will be
		considered to be hexadecimal.  Example: Using CTRL-X on
		"0x100" results in "0x0ff".
	bin	If included, numbers starting with "0b" or "0B" will be
		considered to be binary.  Example: Using CTRL-X on
		"0b1000" subtracts one, resulting in "0b0111".
	unsigned    If included, numbers are recognized as unsigned. Thus a
		leading dash or negative sign won't be considered as part of
		the number.  Examples:
		    Using CTRL-X on "2020" in "9-2020" results in "9-2019"
		    (without "unsigned" it would become "9-2021").
		    Using CTRL-A on "2020" in "9-2020" results in "9-2021"
		    (without "unsigned" it would become "9-2019").
		    Using CTRL-X on "0" or CTRL-A on "18446744073709551615"
		    (2^64 - 1) has no effect, overflow is prevented.
	Numbers which simply begin with a digit in the range 1-9 are always
	considered decimal.  This also happens for numbers that are not
	recognized as octal or hex.

				'number' 'nu' 'nonumber' 'nonu'
'number' 'nu'		boolean	(default off)
			local to window
	Print the line number in front of each line.  When the 'n' option is
	excluded from 'cpoptions' a wrapped line will not use the column of
	line numbers (this is the default when 'compatible' isn't set).
	The 'numberwidth' option can be used to set the room used for the line
	number.
	When a long, wrapped line doesn't start with the first character, '-'
	characters are put before the number.
	For highlighting see hl-LineNr, and hl-CursorLineNr, and the
	:sign-define "numhl" argument.
						number_relativenumber
	The 'relativenumber' option changes the displayed number to be
	relative to the cursor.  Together with 'number' there are these
	four combinations (cursor in line 3):

		'nonu'          'nu'            'nonu'          'nu'
		'nornu'         'nornu'         'rnu'           'rnu'

	    |apple          |  1 apple      |  2 apple      |  2 apple
	    |pear           |  2 pear       |  1 pear       |  1 pear
	    |nobody         |  3 nobody     |  0 nobody     |3   nobody
	    |there          |  4 there      |  1 there      |  1 there

						'numberwidth' 'nuw'
'numberwidth' 'nuw'	number	(Vim default: 4  Vi default: 8)
			local to window
			{only available when compiled with the +linebreak
			feature}
	Minimal number of columns to use for the line number.  Only relevant
	when the 'number' or 'relativenumber' option is set or printing lines
	with a line number. Since one space is always between the number and
	the text, there is one less character for the number itself.
	The value is the minimum width.  A bigger width is used when needed to
	fit the highest line number in the buffer respectively the number of
	rows in the window, depending on whether 'number' or 'relativenumber'
	is set. Thus with the Vim default of 4 there is room for a line number
	up to 999. When the buffer has 1000 lines five columns will be used.
	The minimum value is 1, the maximum value is 20.
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

						'omnifunc' 'ofu'
'omnifunc' 'ofu'	string	(default: empty)
			local to buffer
			{not available when compiled without the +eval
			feature}
	This option specifies a function to be used for Insert mode omni
	completion with CTRL-X CTRL-O. i_CTRL-X_CTRL-O
	See complete-functions for an explanation of how the function is
	invoked and what it should return.  The value can be the name of a
	function, a lambda or a Funcref. See option-value-function for
	more information.
	This option is usually set by a filetype plugin:
	:filetype-plugin-on
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

			    'opendevice' 'odev' 'noopendevice' 'noodev'
'opendevice' 'odev'	boolean	(default off)
			global
			{only for MS-Windows}  E796
	Enable reading and writing from devices.  This may get Vim stuck on a
	device that can be opened but doesn't actually do the I/O.  Therefore
	it is off by default.
	Note that on MS-Windows editing "aux.h", "lpt1.txt" and the like also
	result in editing a device.

						'operatorfunc' 'opfunc'
'operatorfunc' 'opfunc'	string	(default: empty)
			global
	This option specifies a function to be called by the g@ operator.
	See :map-operator for more info and an example.  The value can be
	the name of a function, a lambda or a Funcref. See
	option-value-function for more information.

	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

					'osfiletype' 'oft'
'osfiletype' 'oft'	string (default: "")
			local to buffer
	This option was supported on RISC OS, which has been removed.

				'packpath' 'pp'
'packpath' 'pp'		string	(default: see 'runtimepath')
	Directories used to find packages.  See packages.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'paragraphs' 'para'
'paragraphs' 'para'	string	(default "IPLPPPQPP TPHPLIPpLpItpplpipbp")
			global
	Specifies the nroff macros that separate paragraphs.  These are pairs
	of two letters (see object-motions).

						'paste' 'nopaste'
'paste'			boolean	(default off)
			global
	Put Vim in Paste mode.  This is useful if you want to cut or copy
	some text from one window and paste it in Vim.  This will avoid
	unexpected effects.
	Setting this option is useful when using Vim in a terminal, where Vim
	cannot distinguish between typed text and pasted text.  In the GUI, Vim
	knows about pasting and will mostly do the right thing without 'paste'
	being set.  The same is true for a terminal where Vim handles the
	mouse clicks itself.
	This option is reset when starting the GUI.  Thus if you set it in
	your .vimrc it will work in a terminal, but not in the GUI.  Setting
	'paste' in the GUI has side effects: e.g., the Paste toolbar button
	will no longer work in Insert mode, because it uses a mapping.
	When the 'paste' option is switched on (also when it was already on):
		- mapping in Insert mode and Command-line mode is disabled
		- abbreviations are disabled
		- 'autoindent' is reset
		- 'expandtab' is reset
		- 'hkmap' is reset
		- 'revins' is reset
		- 'ruler' is reset
		- 'showmatch' is reset
		- 'smarttab' is reset
		- 'softtabstop' is set to 0
		- 'textwidth' is set to 0
		- 'wrapmargin' is set to 0
		- 'varsofttabstop' is made empty
	These options keep their value, but their effect is disabled:
		- 'cindent'
		- 'formatoptions' is used like it is empty
		- 'indentexpr'
		- 'lisp'
		- 'smartindent'
	NOTE: When you start editing another file while the 'paste' option is
	on, settings from the modelines or autocommands may change the
	settings again, causing trouble when pasting text.  You might want to
	set the 'paste' option again.
	When the 'paste' option is reset the mentioned options are restored to
	the value before the moment 'paste' was switched from off to on.
	Resetting 'paste' before ever setting it does not have any effect.
	Since mapping doesn't work while 'paste' is active, you need to use
	the 'pastetoggle' option to toggle the 'paste' option with some key.

						'pastetoggle' 'pt'
'pastetoggle' 'pt'	string	(default "")
			global
	When non-empty, specifies the key sequence that toggles the 'paste'
	option.  This is like specifying a mapping: 
	    :map {keys} :set invpaste<CR>
	Where {keys} is the value of 'pastetoggle'.
	The difference is that it will work even when 'paste' is set.
	'pastetoggle' works in Insert mode and Normal mode, but not in
	Command-line mode.
	Mappings are checked first, thus overrule 'pastetoggle'.  However,
	when 'paste' is on mappings are ignored in Insert mode, thus you can do
	this: 
	    :map <F10> :set paste<CR>
	    :map <F11> :set nopaste<CR>
	    :imap <F10> <C-O>:set paste<CR>
	    :imap <F11> <nop>
	    :set pastetoggle=<F11>
	This will make <F10> start paste mode and <F11> stop paste mode.
	Note that typing <F10> in paste mode inserts "<F10>", since in paste
	mode everything is inserted literally, except the 'pastetoggle' key
	sequence.
	When the value has several bytes 'ttimeoutlen' applies.

						'pex' 'patchexpr'
'patchexpr' 'pex'	string	(default "")
			global
			{not available when compiled without the +diff
			feature}
	Expression which is evaluated to apply a patch to a file and generate
	the resulting new version of the file.  See diff-patchexpr.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

					'patchmode' 'pm' E205 E206
'patchmode' 'pm'	string	(default "")
			global
	When non-empty the oldest version of a file is kept.  This can be used
	to keep the original version of a file if you are changing files in a
	source distribution.  Only the first time that a file is written a
	copy of the original file will be kept.  The name of the copy is the
	name of the original file with the string in the 'patchmode' option
	appended.  This option should start with a dot.  Use a string like
	".orig" or ".org".  'backupdir' must not be empty for this to work
	(Detail: The backup file is renamed to the patchmode file after the
	new file has been successfully written, that's why it must be possible
	to write a backup file).  If there was no file to be backed up, an
	empty file is created.
	When the 'backupskip' pattern matches, a patchmode file is not made.
	Using 'patchmode' for compressed files appends the extension at the
	end (e.g., "file.gz.orig"), thus the resulting name isn't always
	recognized as a compressed file.
	Only normal file name characters can be used, "/\*?[|<>" are illegal.

				'path' 'pa' E343 E345 E347 E854
'path' 'pa'		string	(default on Unix: ".,/usr/include,,"
				   other systems: ".,,")
			global or local to buffer global-local
	This is a list of directories which will be searched when using the
	gf, [f, ]f, ^Wf, :find, :sfind, :tabfind and other commands,
	provided that the file being searched for has a relative path (not
	starting with "/", "./" or "../").  The directories in the 'path'
	option may be relative or absolute.
	- Use commas to separate directory names: 
		:set path=.,/usr/local/include,/usr/include
	- Spaces can also be used to separate directory names (for backwards
	  compatibility with version 3.0).  To have a space in a directory
	  name, precede it with an extra backslash, and escape the space: 
		:set path=.,/dir/with\\\ space
	- To include a comma in a directory name precede it with an extra
	  backslash: 
		:set path=.,/dir/with\\,comma
	- To search relative to the directory of the current file, use: 
		:set path=.
	- To search in the current directory use an empty string between two
	  commas: 
		:set path=,,
	- A directory name may end in a ':' or '/'.
	- Environment variables are expanded :set_env.
	- When using netrw.vim URLs can be used.  For example, adding
	  "http://www.vim.org" will make ":find index.html" work.
	- Search upwards and downwards in a directory tree using "*", "**" and
	  ";".  See file-searching for info and syntax.
	- Careful with '\' characters, type two to get one in the option: 
		:set path=.,c:\\include
	  Or just use '/' instead: 
		:set path=.,c:/include
	Don't forget "." or files won't even be found in the same directory as
	the file!
	The maximum length is limited.  How much depends on the system, mostly
	it is something like 256 or 1024 characters.
	You can check if all the include files are found, using the value of
	'path', see :checkpath.
	The use of :set+= and :set-= is preferred when adding or removing
	directories from the list.  This avoids problems when a future version
	uses another default.  To remove the current directory use: 
		:set path-=
	To add the current directory use: 
		:set path+=
	To use an environment variable, you probably need to replace the
	separator.  Here is an example to append $INCL, in which directory
	names are separated with a semi-colon: 
		:let &path = &path .. "," .. substitute($INCL, ';', ',', 'g')
	Replace the ';' with a ':' or whatever separator is used.  Note that
	this doesn't work when $INCL contains a comma or white space.

						'perldll'
'perldll'		string	(default depends on the build)
			global
			{only available when compiled with the +perl/dyn
			feature}
	Specifies the name of the Perl shared library. The default is
	DYNAMIC_PERL_DLL, which was specified at compile time.
	Environment variables are expanded :set_env.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

			'preserveindent' 'pi' 'nopreserveindent' 'nopi'
'preserveindent' 'pi'	boolean	(default off)
			local to buffer
	When changing the indent of the current line, preserve as much of the
	indent structure as possible.  Normally the indent is replaced by a
	series of tabs followed by spaces as required (unless 'expandtab' is
	enabled, in which case only spaces are used).  Enabling this option
	means the indent will preserve as many existing characters as possible
	for indenting, and only add additional tabs or spaces as required.
	'expandtab' does not apply to the preserved white space, a Tab remains
	a Tab.
	NOTE: When using ">>" multiple times the resulting indent is a mix of
	tabs and spaces.  You might not like this.
	NOTE: This option is reset when 'compatible' is set.
	Also see 'copyindent'.
	Use :retab to clean up white space.

					'previewheight' 'pvh'
'previewheight' 'pvh'	number (default 12)
			global
			{not available when compiled without the +quickfix
			feature}
	Default height for a preview window.  Used for :ptag and associated
	commands.  Used for CTRL-W_} when no count is given.  Not used when
	'previewpopup' is set.

					'previewpopup' 'pvp'
'previewpopup' 'pvp'	string (default empty)
			global
			{not available when compiled without the +textprop
			or +quickfix feature}
	When not empty a popup window is used for commands that would open a
	preview window.  See preview-popup.
	Not used for the insert completion info, add "popup" to
	'completeopt' for that.

					'previewwindow' 'nopreviewwindow'
					'pvw' 'nopvw' E590
'previewwindow' 'pvw'	boolean (default off)
			local to window  local-noglobal
			{not available when compiled without the +quickfix
			feature}
	Identifies the preview window.  Only one window can have this option
	set.  It's normally not set directly, but by using one of the commands
	:ptag, :pedit, etc.

						'printdevice' 'pdev'
'printdevice' 'pdev'	string	(default empty)
			global
			{only available when compiled with the +printer
			feature}
	The name of the printer to be used for :hardcopy.
	See pdev-option.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'printencoding' 'penc'
'printencoding' 'penc'	string	(default empty, except for some systems)
			global
			{only available when compiled with the +printer
			and +postscript features}
	Sets the character encoding used when printing.
	See penc-option.

						'printexpr' 'pexpr'
'printexpr' 'pexpr'	string	(default: see below)
			global
			{only available when compiled with the +printer
			and +postscript features}
	Expression used to print the PostScript produced with :hardcopy.
	See pexpr-option.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'printfont' 'pfn'
'printfont' 'pfn'	string	(default "courier")
			global
			{only available when compiled with the +printer
			feature}
	The name of the font that will be used for :hardcopy.
	See pfn-option.

						'printheader' 'pheader'
'printheader' 'pheader'  string  (default "%<%f%h%m%=Page %N")
			global
			{only available when compiled with the +printer
			feature}
	The format of the header produced in :hardcopy output.
	See pheader-option.

						'printmbcharset' 'pmbcs'
'printmbcharset' 'pmbcs'  string (default "")
			global
			{only available when compiled with the +printer
			and +postscript features}
	The CJK character set to be used for CJK output from :hardcopy.
	See pmbcs-option.

						'printmbfont' 'pmbfn'
'printmbfont' 'pmbfn'	string (default "")
			global
			{only available when compiled with the +printer
			and +postscript features}
	List of font names to be used for CJK output from :hardcopy.
	See pmbfn-option.

						'printoptions' 'popt'
'printoptions' 'popt' string (default "")
			global
			{only available when compiled with |+printer| feature}
	List of items that control the format of the output of :hardcopy.
	See popt-option.

						'prompt' 'noprompt'
'prompt'		boolean	(default on)
			global
	When on a ":" prompt is used in Ex mode.

						'pumheight' 'ph'
'pumheight' 'ph'	number	(default 0)
			global
	Determines the maximum number of items to show in the popup menu for
	Insert mode completion.  When zero as much space as available is used.
	ins-completion-menu.

						'pumwidth' 'pw'
'pumwidth' 'pw'		number	(default 15)
			global
	Determines the minimum width to use for the popup menu for Insert mode
	completion.  ins-completion-menu.

						'pythondll'
'pythondll'		string	(default depends on the build)
			global
			{only available when compiled with the +python/dyn
			feature}
	Specifies the name of the Python 2.x shared library. The default is
	DYNAMIC_PYTHON_DLL, which was specified at compile time.
	Environment variables are expanded :set_env.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'pythonhome'
'pythonhome'		string	(default "")
			global
			{only available when compiled with the +python/dyn
			feature}
	Specifies the name of the Python 2.x home directory. When 'pythonhome'
	and the PYTHONHOME environment variable are not set, PYTHON_HOME,
	which was specified at compile time, will be used for the Python 2.x
	home directory.
	Environment variables are expanded :set_env.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'pythonthreedll'
'pythonthreedll'	string	(default depends on the build)
			global
			{only available when compiled with the +python3/dyn
			feature}
	Specifies the name of the Python 3 shared library. The default is
	DYNAMIC_PYTHON3_DLL, which was specified at compile time.
	Environment variables are expanded :set_env.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'pythonthreehome'
'pythonthreehome'	string	(default "")
			global
			{only available when compiled with the +python3/dyn
			feature}
	Specifies the name of the Python 3 home directory. When
	'pythonthreehome' and the PYTHONHOME environment variable are not set,
	PYTHON3_HOME, which was specified at compile time, will be used for
	the Python 3 home directory.
	Environment variables are expanded :set_env.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'pyxversion' 'pyx'
'pyxversion' 'pyx'	number	(default depends on the build)
			global
			{only available when compiled with the +python or
			the +python3 feature}
	Specifies the python version used for pyx* functions and commands
	python_x.  The default value is as follows:

		Compiled with		     Default 
		+python and +python3    	0
		only +python  			2
		only +python3  			3

	Available values are 0, 2 and 3.
	If 'pyxversion' is 0, it is set to 2 or 3 after the first execution of
	any python2/3 commands or functions.  E.g. :py sets to 2, and :py3
	sets to 3. :pyx sets it to 3 if Python 3 is available, otherwise sets
	to 2 if Python 2 is available.
	See also: has-pythonx

	If Vim is compiled with only +python or +python3 setting
	'pyxversion' has no effect.  The pyx* functions and commands are
	always the same as the compiled version.

	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'quickfixtextfunc' 'qftf'
'quickfixtextfunc' 'qftf'	string (default "")
			global
			{only available when compiled with the +quickfix
			feature}
	This option specifies a function to be used to get the text to display
	in the quickfix and location list windows.  This can be used to
	customize the information displayed in the quickfix or location window
	for each entry in the corresponding quickfix or location list.  See
	quickfix-window-function for an explanation of how to write the
	function and an example.  The value can be the name of a function, a
	lambda or a Funcref. See option-value-function for more
	information.

	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'quoteescape' 'qe'
'quoteescape' 'qe'	string	(default "\")
			local to buffer
	The characters that are used to escape quotes in a string.  Used for
	objects like a', a" and a` a'.
	When one of the characters in this option is found inside a string,
	the following character will be skipped.  The default value makes the
	text "foo\"bar\\" considered to be one string.

				   'readonly' 'ro' 'noreadonly' 'noro'
'readonly' 'ro'		boolean	(default off)
			local to buffer  local-noglobal
	If on, writes fail unless you use a '!'.  Protects you from
	accidentally overwriting a file.  Default on when Vim is started
	in read-only mode ("vim -R") or when the executable is called "view".
	When using ":w!" the 'readonly' option is reset for the current
	buffer, unless the 'Z' flag is in 'cpoptions'.
	When using the ":view" command the 'readonly' option is set for the
	newly edited buffer.
	See 'modifiable' for disallowing changes to the buffer.

						'redrawtime' 'rdt'
'redrawtime' 'rdt'	number	(default 2000)
			global
			{only available when compiled with the +reltime
			feature}
	The time in milliseconds for redrawing the display.  This applies to
	searching for patterns for 'hlsearch', :match highlighting and syntax
	highlighting.
	When redrawing takes more than this many milliseconds no further
	matches will be highlighted.
	For syntax highlighting the time applies per window.  When over the
	limit syntax highlighting is disabled until CTRL-L is used.
	This is used to avoid that Vim hangs when using a very complicated
	pattern.

						'regexpengine' 're'
'regexpengine' 're'	number	(default 0)
			global
	This selects the default regexp engine. two-engines
	The possible values are:
		0	automatic selection
		1	old engine
		2	NFA engine
	Note that when using the NFA engine and the pattern contains something
	that is not supported the pattern will not match.  This is only useful
	for debugging the regexp engine.
	Using automatic selection enables Vim to switch the engine, if the
	default engine becomes too costly.  E.g., when the NFA engine uses too
	many states.  This should prevent Vim from hanging on a combination of
	a complex pattern with long text.

		'relativenumber' 'rnu' 'norelativenumber' 'nornu'
'relativenumber' 'rnu'	boolean	(default off)
			local to window
	Show the line number relative to the line with the cursor in front of
	each line. Relative line numbers help you use the count you can
	precede some vertical motion commands (e.g. j k + -) with, without
	having to calculate it yourself. Especially useful in combination with
	other commands (e.g. y d c < > gq gw =).
	When the 'n' option is excluded from 'cpoptions' a wrapped
	line will not use the column of line numbers (this is the default when
	'compatible' isn't set).
	The 'numberwidth' option can be used to set the room used for the line
	number.
	When a long, wrapped line doesn't start with the first character, '-'
	characters are put before the number.
	See hl-LineNr  and hl-CursorLineNr for the highlighting used for
	the number.

	The number in front of the cursor line also depends on the value of
	'number', see number_relativenumber for all combinations of the two
	options.

						'remap' 'noremap'
'remap'			boolean	(default on)
			global
	Allows for mappings to work recursively.  If you do not want this for
	a single entry, use the :noremap[!] command.
	NOTE: To avoid portability problems with Vim scripts, always keep
	this option at the default "on".  Only switch it off when working with
	old Vi scripts.

                                               'renderoptions' 'rop'
'renderoptions' 'rop'	string  (default: empty)
			global
			{only available when compiled with GUI and DIRECTX on
			MS-Windows}
	Select a text renderer and set its options.  The options depend on the
	renderer.

	Syntax: 
		set rop=type:{renderer}(,{name}:{value})*

	Currently, only one optional renderer is available.

	render	behavior    
	directx	Vim will draw text using DirectX (DirectWrite).  It makes
		drawn glyphs more beautiful than default GDI.
		It requires 'encoding' is "utf-8", and only works on
		MS-Windows Vista or newer version.

		Options:
		  name	    meaning		type	value       
		  gamma	    gamma		float	1.0 - 2.2 (maybe)
		  contrast  enhancedContrast	float	(unknown)
		  level	    clearTypeLevel	float	(unknown)
		  geom	    pixelGeometry	int	0 - 2 (see below)
		  renmode   renderingMode	int	0 - 6 (see below)
		  taamode   textAntialiasMode	int	0 - 3 (see below)
		  scrlines  Scroll Lines	int	(deprecated)

		See this URL for detail (except for scrlines):
		  https://msdn.microsoft.com/en-us/library/dd368190.aspx

		For geom: structure of a device pixel.
		  0 - DWRITE_PIXEL_GEOMETRY_FLAT
		  1 - DWRITE_PIXEL_GEOMETRY_RGB
		  2 - DWRITE_PIXEL_GEOMETRY_BGR

		See this URL for detail:
		  https://msdn.microsoft.com/en-us/library/dd368114.aspx

		For renmode: method of rendering glyphs.
		  0 - DWRITE_RENDERING_MODE_DEFAULT
		  1 - DWRITE_RENDERING_MODE_ALIASED
		  2 - DWRITE_RENDERING_MODE_GDI_CLASSIC
		  3 - DWRITE_RENDERING_MODE_GDI_NATURAL
		  4 - DWRITE_RENDERING_MODE_NATURAL
		  5 - DWRITE_RENDERING_MODE_NATURAL_SYMMETRIC
		  6 - DWRITE_RENDERING_MODE_OUTLINE

		See this URL for detail:
		  https://msdn.microsoft.com/en-us/library/dd368118.aspx

		For taamode: antialiasing mode used for drawing text.
		  0 - D2D1_TEXT_ANTIALIAS_MODE_DEFAULT
		  1 - D2D1_TEXT_ANTIALIAS_MODE_CLEARTYPE
		  2 - D2D1_TEXT_ANTIALIAS_MODE_GRAYSCALE
		  3 - D2D1_TEXT_ANTIALIAS_MODE_ALIASED

		See this URL for detail:
		  https://msdn.microsoft.com/en-us/library/dd368170.aspx

		For scrlines:
		This was used for optimizing scrolling behavior, however this
		is now deprecated.  If specified, it is simply ignored.

		Example: 
		  set encoding=utf-8
		  set gfn=Ricty_Diminished:h12
		  set rop=type:directx

		If select a raster font (Courier, Terminal or FixedSys which
		have ".fon" extension in file name) to 'guifont', it will be
		drawn by GDI as a fallback.

		NOTE: It is known that some fonts and options combination
		causes trouble on drawing glyphs.

		  - 'renmode:5' and 'renmode:6' will not work with some
		    special made fonts (True-Type fonts which includes only
		    bitmap glyphs).
		  - 'taamode:3' will not work with some vector fonts.

		NOTE: With this option, you can display colored emoji
		(emoticon) in Windows 8.1 or later.  To display colored emoji,
		there are some conditions which you should notice.

		  - If your font includes non-colored emoji already, it will
		    be used.
		  - If your font doesn't have emoji, the system chooses an
		    alternative symbol font.  On Windows 10, "Segoe UI Emoji"
		    will be used.
		  - When this alternative font didn't have fixed width glyph,
		    emoji might be rendered beyond the bounding box of drawing
		    cell.

	Other render types are currently not supported.

						'report'
'report'		number	(default 2)
			global
	Threshold for reporting number of lines changed.  When the number of
	changed lines is more than 'report' a message will be given for most
	":" commands.  If you want it always, set 'report' to 0.
	For the ":substitute" command the number of substitutions is used
	instead of the number of lines.

			 'restorescreen' 'rs' 'norestorescreen' 'nors'
'restorescreen' 'rs'	boolean	(default on)
			global
			{only in MS-Windows console version}
	When set, the screen contents is restored when exiting Vim.  This also
	happens when executing external commands.

	For non-Windows Vim: You can set or reset the 't_ti' and 't_te'
	options in your .vimrc.  To disable restoring:
		set t_ti= t_te=
	To enable restoring (for an xterm):
		set t_ti=^[7^[[r^[[?47h t_te=^[[?47l^[8
	(Where ^[ is an <Esc>, type CTRL-V <Esc> to insert it)

				'revins' 'ri' 'norevins' 'nori'
'revins' 'ri'		boolean	(default off)
			global
			{only available when compiled with the +rightleft
			feature}
	Inserting characters in Insert mode will work backwards.  See "typing
	backwards" ins-reverse.  This option can be toggled with the CTRL-_
	command in Insert mode, when 'allowrevins' is set.
	NOTE: This option is reset when 'compatible' is set.
	This option is reset when 'paste' is set and restored when 'paste' is
	reset.

				 'rightleft' 'rl' 'norightleft' 'norl'
'rightleft' 'rl'	boolean	(default off)
			local to window
			{only available when compiled with the +rightleft
			feature}
	When on, display orientation becomes right-to-left, i.e., characters
	that are stored in the file appear from the right to the left.
	Using this option, it is possible to edit files for languages that
	are written from the right to the left such as Hebrew and Arabic.
	This option is per window, so it is possible to edit mixed files
	simultaneously, or to view the same file in both ways (this is
	useful whenever you have a mixed text file with both right-to-left
	and left-to-right strings so that both sets are displayed properly
	in different windows).  Also see rileft.txt.

			'rightleftcmd' 'rlc'
'rightleftcmd' 'rlc'	string	(default "search")
			local to window
			{only available when compiled with the +rightleft
			feature}
	Each word in this option enables the command line editing to work in
	right-to-left mode for a group of commands:

		search		"/" and "?" commands

	This is useful for languages such as Hebrew, Arabic and Farsi.
	The 'rightleft' option must be set for 'rightleftcmd' to take effect.

						'rubydll'
'rubydll'		string	(default: depends on the build)
			global
			{only available when compiled with the +ruby/dyn
			feature}
	Specifies the name of the Ruby shared library. The default is
	DYNAMIC_RUBY_DLL, which was specified at compile time.
	Environment variables are expanded :set_env.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

					 'ruler' 'ru' 'noruler' 'noru'
'ruler' 'ru'		boolean	(default off, set in defaults.vim)
			global
	Show the line and column number of the cursor position, separated by a
	comma.  When there is room, the relative position of the displayed
	text in the file is shown on the far right:
		Top	first line is visible
		Bot	last line is visible
		All	first and last line are visible
		45%	relative position in the file
	If 'rulerformat' is set, it will determine the contents of the ruler.
	Each window has its own ruler.  If a window has a status line, the
	ruler is shown there.  Otherwise it is shown in the last line of the
	screen.  If the statusline is given by 'statusline' (i.e. not empty),
	this option takes precedence over 'ruler' and 'rulerformat'.
	If the number of characters displayed is different from the number of
	bytes in the text (e.g., for a TAB or a multibyte character), both
	the text column (byte number) and the screen column are shown,
	separated with a dash.
	For an empty line "0-1" is shown.
	For an empty buffer the line number will also be zero: "0,0-1".
	This option is reset when 'paste' is set and restored when 'paste' is
	reset.
	If you don't want to see the ruler all the time but want to know where
	you are, use "g CTRL-G" g_CTRL-G.
	NOTE: This option is reset when 'compatible' is set.

						'rulerformat' 'ruf'
'rulerformat' 'ruf'	string	(default empty)
			global
			{not available when compiled without the +statusline
			feature}
	When this option is not empty, it determines the content of the ruler
	string, as displayed for the 'ruler' option.
	The format of this option is like that of 'statusline'.
	This option cannot be set in a modeline when 'modelineexpr' is off.

	The default ruler width is 17 characters.  To make the ruler 15
	characters wide, put "%15(" at the start and "%)" at the end.
	Example: 
		:set rulerformat=%15(%c%V\ %p%%%)

				'runtimepath' 'rtp' vimfiles
'runtimepath' 'rtp'	string	(default:
					Unix, macOS: "$HOME/.vim,
						$VIM/vimfiles,
						$VIMRUNTIME,
						$VIM/vimfiles/after,
						$HOME/.vim/after"
					Amiga: "home:vimfiles,
						$VIM/vimfiles,
						$VIMRUNTIME,
						$VIM/vimfiles/after,
						home:vimfiles/after"
					MS-Windows: "$HOME/vimfiles,
						$VIM/vimfiles,
						$VIMRUNTIME,
						$VIM/vimfiles/after,
						$HOME/vimfiles/after"
					Classic Mac OS: "$VIM:vimfiles,
						$VIMRUNTIME,
						$VIM:vimfiles:after"
					Haiku: "$BE_USER_SETTINGS/vim,
						$VIM/vimfiles,
						$VIMRUNTIME,
						$VIM/vimfiles/after,
						$BE_USER_SETTINGS/vim/after"
					VMS:   "sys$login:vimfiles,
						$VIM/vimfiles,
						$VIMRUNTIME,
						$VIM/vimfiles/after,
						sys$login:vimfiles/after")
			global
	This is a list of directories which will be searched for runtime
	files:
	  filetype.vim	filetypes by file name new-filetype
	  scripts.vim	filetypes by file contents new-filetype-scripts
	  autoload/	automatically loaded scripts autoload-functions
	  colors/	color scheme files :colorscheme
	  compiler/	compiler files :compiler
	  doc/		documentation write-local-help
	  ftplugin/	filetype plugins write-filetype-plugin
	  import/	files that are found by :import
	  indent/	indent scripts indent-expression
	  keymap/	key mapping files mbyte-keymap
	  lang/		menu translations :menutrans
	  menu.vim	GUI menus menu.vim
	  pack/		packages :packadd
	  plugin/	plugin scripts write-plugin
	  print/	files for printing postscript-print-encoding
	  spell/	spell checking files spell
	  syntax/	syntax files mysyntaxfile
	  tutor/	files for vimtutor tutor

	And any other file searched for with the :runtime command.

	The defaults for most systems are setup to search five locations:
	1. In your home directory, for your personal preferences.
	2. In a system-wide Vim directory, for preferences from the system
	   administrator.
	3. In $VIMRUNTIME, for files distributed with Vim.
							after-directory
	4. In the "after" directory in the system-wide Vim directory.  This is
	   for the system administrator to overrule or add to the distributed
	   defaults (rarely needed)
	5. In the "after" directory in your home directory.  This is for
	   personal preferences to overrule or add to the distributed defaults
	   or system-wide settings (rarely needed).

	More entries are added when using packages.  If it gets very long
	then `:set rtp` will be truncated, use `:echo &rtp` to see the full
	string.

	Note that, unlike 'path', no wildcards like "**" are allowed.  Normal
	wildcards are allowed, but can significantly slow down searching for
	runtime files.  For speed, use as few items as possible and avoid
	wildcards.
	See :runtime.
	Example: 
		:set runtimepath=~/vimruntime,/mygroup/vim,$VIMRUNTIME
	This will use the directory "~/vimruntime" first (containing your
	personal Vim runtime files), then "/mygroup/vim" (shared between a
	group of people) and finally "$VIMRUNTIME" (the distributed runtime
	files).
	You probably should always include $VIMRUNTIME somewhere, to use the
	distributed runtime files.  You can put a directory before $VIMRUNTIME
	to find files which replace a distributed runtime files.  You can put
	a directory after $VIMRUNTIME to find files which add to distributed
	runtime files.
	When Vim is started with --clean the home directory entries are not
	included.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'scroll' 'scr'
'scroll' 'scr'		number	(default: half the window height)
			local to window  local-noglobal
	Number of lines to scroll with CTRL-U and CTRL-D commands.  Will be
	set to half the number of lines in the window when the window size
	changes.  This may happen when enabling the status-line or
	'tabline' option after setting the 'scroll' option.
	If you give a count to the CTRL-U or CTRL-D command it will
	be used as the new value for 'scroll'.  Reset to half the window
	height with ":set scroll=0".

			'scrollbind' 'scb' 'noscrollbind' 'noscb'
'scrollbind' 'scb'	boolean  (default off)
			local to window
	See also scroll-binding.  When this option is set, scrolling the
	current window also scrolls other scrollbind windows (windows that
	also have this option set).  This option is useful for viewing the
	differences between two versions of a file, see 'diff'.
	See 'scrollopt' for options that determine how this option should be
	interpreted.
	This option is mostly reset when splitting a window to edit another
	file.  This means that ":split | edit file" results in two windows
	with scroll-binding, but ":split file" does not.

			'scrollfocus' 'scf' 'noscrollfocus' 'noscf'
'scrollfocus' 'scf'	boolean  (default off)
			global
			{only for MS-Windows GUI}
	When using the scroll wheel and this option is set, the window under
	the mouse pointer is scrolled.  With this option off the current
	window is scrolled.
	Systems other than MS-Windows always behave like this option is on.

						'scrolljump' 'sj'
'scrolljump' 'sj'	number	(default 1)
			global
	Minimal number of lines to scroll when the cursor gets off the
	screen (e.g., with "j").  Not used for scroll commands (e.g., CTRL-E,
	CTRL-D).  Useful if your terminal scrolls very slowly.
	When set to a negative number from -1 to -100 this is used as the
	percentage of the window height.  Thus -50 scrolls half the window
	height.
	NOTE: This option is set to 1 when 'compatible' is set.

						'scrolloff' 'so'
'scrolloff' 'so'	number	(default 0, set to 5 in defaults.vim)
			global or local to window global-local
	Minimal number of screen lines to keep above and below the cursor.
	This will make some context visible around where you are working.  If
	you set it to a very large value (999) the cursor line will always be
	in the middle of the window (except at the start or end of the file or
	when long lines wrap).
	After using the local value, go back the global value with one of
	these two: 
		setlocal scrolloff<
		setlocal scrolloff=-1
	For scrolling horizontally see 'sidescrolloff'.
	NOTE: This option is set to 0 when 'compatible' is set.

						'scrollopt' 'sbo'
'scrollopt' 'sbo'	string	(default "ver,jump")
			global
	This is a comma-separated list of words that specifies how
	'scrollbind' windows should behave.  'sbo' stands for ScrollBind
	Options.
	The following words are available:
	    ver		Bind vertical scrolling for 'scrollbind' windows
	    hor		Bind horizontal scrolling for 'scrollbind' windows
	    jump	Applies to the offset between two windows for vertical
			scrolling.  This offset is the difference in the first
			displayed line of the bound windows.  When moving
			around in a window, another 'scrollbind' window may
			reach a position before the start or after the end of
			the buffer.  The offset is not changed though, when
			moving back the 'scrollbind' window will try to scroll
			to the desired position when possible.
			When now making that window the current one, two
			things can be done with the relative offset:
			1. When "jump" is not included, the relative offset is
			   adjusted for the scroll position in the new current
			   window.  When going back to the other window, the
			   new relative offset will be used.
			2. When "jump" is included, the other windows are
			   scrolled to keep the same relative offset.  When
			   going back to the other window, it still uses the
			   same relative offset.
	Also see scroll-binding.
	When 'diff' mode is active there always is vertical scroll binding,
	even when "ver" isn't there.

						'sections' 'sect'
'sections' 'sect'	string	(default "SHNHH HUnhsh")
			global
	Specifies the nroff macros that separate sections.  These are pairs of
	two letters (See object-motions).  The default makes a section start
	at the nroff macros ".SH", ".NH", ".H", ".HU", ".nh" and ".sh".

						'secure' 'nosecure' E523
'secure'		boolean	(default off)
			global
	When on, ":autocmd", shell and write commands are not allowed in
	".vimrc" and ".exrc" in the current directory and map commands are
	displayed.  Switch it off only if you know that you will not run into
	problems, or when the 'exrc' option is off.  On Unix this option is
	only used if the ".vimrc" or ".exrc" is not owned by you.  This can be
	dangerous if the systems allows users to do a "chown".  You better set
	'secure' at the end of your ~/.vimrc then.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'selection' 'sel'
'selection' 'sel'	string	(default "inclusive")
			global
	This option defines the behavior of the selection.  It is only used
	in Visual and Select mode.
	Possible values:
	   value	past line     inclusive 
	   old		   no		yes
	   inclusive	   yes		yes
	   exclusive	   yes		no
	"past line" means that the cursor is allowed to be positioned one
	character past the line.
	"inclusive" means that the last character of the selection is included
	in an operation.  For example, when "x" is used to delete the
	selection.
	When "old" is used and 'virtualedit' allows the cursor to move past
	the end of line the line break still isn't included.
	Note that when "exclusive" is used and selecting from the end
	backwards, you cannot include the last character of a line, when
	starting in Normal mode and 'virtualedit' empty.

	The 'selection' option is set by the :behave command.

						'selectmode' 'slm'
'selectmode' 'slm'	string	(default "")
			global
	This is a comma-separated list of words, which specifies when to start
	Select mode instead of Visual mode, when a selection is started.
	Possible values:
	   mouse	when using the mouse
	   key		when using shifted special keys
	   cmd		when using "v", "V" or CTRL-V
	See Select-mode.
	The 'selectmode' option is set by the :behave command.

						'sessionoptions' 'ssop'
'sessionoptions' 'ssop'	string	(default: "blank,buffers,curdir,folds,
					 help,options,tabpages,winsize,terminal")
			global
			{not available when compiled without the +mksession
			feature}
	Changes the effect of the :mksession command.  It is a comma
	separated list of words.  Each word enables saving and restoring
	something:
	   word		save and restore 
	   blank	empty windows
	   buffers	hidden and unloaded buffers, not just those in windows
	   curdir	the current directory
	   folds	manually created folds, opened/closed folds and local
			fold options
	   globals	global variables that start with an uppercase letter
			and contain at least one lowercase letter.  Only
			String and Number types are stored.
	   help		the help window
	   localoptions	options and mappings local to a window or buffer (not
			global values for local options)
	   options	all options and mappings (also global values for local
			options)
	   skiprtp	exclude 'runtimepath' and 'packpath' from the options
	   resize	size of the Vim window: 'lines' and 'columns'
	   sesdir	the directory in which the session file is located
			will become the current directory (useful with
			projects accessed over a network from different
			systems)
	   slash	backslashes in file names replaced with forward
			slashes
	   tabpages	all tab pages; without this only the current tab page
			is restored, so that you can make a session for each
			tab page separately
	   terminal	include terminal windows where the command can be
			restored
	   unix		with Unix end-of-line format (single <NL>), even when
			on Windows or DOS
	   winpos	position of the whole Vim window
	   winsize	window sizes

	Don't include both "curdir" and "sesdir".
	When neither "curdir" nor "sesdir" is included, file names are stored
	with absolute paths.
	If you leave out "options" many things won't work well after restoring
	the session.
	"slash" and "unix" are useful on Windows when sharing session files
	with Unix.  The Unix version of Vim cannot source dos format scripts,
	but the Windows version of Vim can source unix format scripts.

						'shell' 'sh' E91
'shell' 'sh'		string	(default $SHELL or "sh", Win32: "cmd.exe")
			global
	Name of the shell to use for ! and :! commands.  When changing the
	value also check these options: 'shelltype', 'shellpipe', 'shellslash'
	'shellredir', 'shellquote', 'shellxquote' and 'shellcmdflag'.
	It is allowed to give an argument to the command, e.g.  "csh -f".
	See option-backslash about including spaces and backslashes.
	Environment variables are expanded :set_env.

	In restricted-mode shell commands will not be possible.  This mode
	is used if the value of $SHELL ends in "false" or "nologin".

	If the name of the shell contains a space, you need to enclose it in
	quotes and escape the space.  Example with quotes: 
		:set shell=\"c:\program\ files\unix\sh.exe\"\ -f
	Note the backslash before each quote (to avoid starting a comment) and
	each space (to avoid ending the option value).  Also note that the
	"-f" is not inside the quotes, because it is not part of the command
	name.  Vim automagically recognizes the backslashes that are path
	separators.
	Example with escaped space (Vim will do this when initializing the
	option from $SHELL): 
		:set shell=/bin/with\\\ space/sh
	The resulting value of 'shell' is "/bin/with\ space/sh", two
	backslashes are consumed by :set.

	Under MS-Windows, when the executable ends in ".com" it must be
	included.  Thus setting the shell to "command.com" or "4dos.com"
	works, but "command" and "4dos" do not work for all commands (e.g.,
	filtering).
	For unknown reasons, when using "4dos.com" the current directory is
	changed to "C:\".  To avoid this set 'shell' like this: 
		:set shell=command.com\ /c\ 4dos
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'shellcmdflag' 'shcf'
'shellcmdflag' 'shcf'	string	(default: "-c";
				 Win32, when 'shell' contains "powershell":
				 "-Command", or when it does not contain "sh"
				 somewhere: "/c")
			global
	Flag passed to the shell to execute "!" and ":!" commands; e.g.,
	"bash.exe -c ls", "powershell.exe -Command dir", or "cmd.exe /c dir".
	For MS-Windows, the default is set according to the value of 'shell',
	to reduce the need to set this option by the user.
	On Unix it can have more than one flag.  Each white space separated
	part is passed as an argument to the shell command.
	See option-backslash about including spaces and backslashes.
	Also see dos-shell and dos-powershell for MS-Windows.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'shellpipe' 'sp'
'shellpipe' 'sp'	string	(default ">", ">%s 2>&1", "| tee", "|& tee"
				 "2>&1| tee", or
				 "2>&1 | Out-File -Encoding default")
			global
			{not available when compiled without the +quickfix
			feature}
	String to be used to put the output of the ":make" command in the
	error file.  See also :make_makeprg.  See option-backslash about
	including spaces and backslashes.
	The name of the temporary file can be represented by "%s" if necessary
	(the file name is appended automatically if no %s appears in the value
	of this option).
	For the Amiga the default is ">".  For MS-Windows using powershell the
	default is "2>&1 | Out-File -Encoding default", otherwise the default
	is ">%s 2>&1".  The output is directly saved in a file and not echoed
	to the screen.
	For Unix the default is "| tee".  The stdout of the compiler is saved
	in a file and echoed to the screen.  If the 'shell' option is "csh" or
	"tcsh" after initializations, the default becomes "|& tee".  If the
	'shell' option is "sh", "ksh", "mksh", "pdksh", "zsh", "zsh-beta",
	"bash", "fish", "ash" or "dash" the default becomes "2>&1| tee".  This
	means that stderr is also included.  Before using the 'shell' option a
	path is removed, thus "/bin/sh" uses "sh".
	For Unix and MS-Windows, when the 'shell' option is "pwsh" the default
	becomes ">%s 2>&1" and the output is not echoed to the screen.
	The initialization of this option is done after reading the ".vimrc"
	and the other initializations, so that when the 'shell' option is set
	there, the 'shellpipe' option changes automatically, unless it was
	explicitly set before.
	When 'shellpipe' is set to an empty string, no redirection of the
	":make" output will be done.  This is useful if you use a 'makeprg'
	that writes to 'makeef' by itself.  If you want no piping, but do
	want to include the 'makeef', set 'shellpipe' to a single space.
	Don't forget to precede the space with a backslash: ":set sp=\ ".
	In the future pipes may be used for filtering and this option will
	become obsolete (at least for Unix).
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'shellquote' 'shq'
'shellquote' 'shq'	string	(default: "")
			global
	Quoting character(s), put around the command passed to the shell, for
	the "!" and ":!" commands.  The redirection is kept outside of the
	quoting.  See 'shellxquote' to include the redirection.  It's
	probably not useful to set both options.
	This is an empty string by default.  Only known to be useful for
	third-party shells on MS-Windows-like systems, such as the MKS Korn
	Shell or bash, where it should be "\"".  See dos-shell.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'shellredir' 'srr'
'shellredir' 'srr'	string	(default ">", ">&", ">%s 2>&1", or
				 "2>&1 | Out-File -Encoding default")
			global
	String to be used to put the output of a filter command in a temporary
	file.  See also :!.  See option-backslash about including spaces
	and backslashes.
	The name of the temporary file can be represented by "%s" if necessary
	(the file name is appended automatically if no %s appears in the value
	of this option).
	The default is ">".  For Unix, if the 'shell' option is "csh" or
	"tcsh" during initializations, the default becomes ">&".  If the
	'shell' option is "sh", "ksh", "mksh", "pdksh", "zsh", "zsh-beta",
	"bash", "fish", or "pwsh", the default becomes ">%s 2>&1".  This means
	that stderr is also included.  For Win32, the Unix checks are done and
	additionally "cmd" is checked for, which makes the default ">%s 2>&1",
	and "powershell" is checked for which makes the default
	"2>&1 | Out-File -Encoding default" (see dos-powershell).  Also, the
	same names with ".exe" appended are checked for.
	The initialization of this option is done after reading the ".vimrc"
	and the other initializations, so that when the 'shell' option is set
	there, the 'shellredir' option changes automatically unless it was
	explicitly set before.
	In the future pipes may be used for filtering and this option will
	become obsolete (at least for Unix).
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

			'shellslash' 'ssl' 'noshellslash' 'nossl'
'shellslash' 'ssl'	boolean	(default off)
			global
			{only for MS-Windows}
	When set, a forward slash is used when expanding file names.  This is
	useful when a Unix-like shell is used instead of cmd.exe, pwsh.exe, or
	powershell.exe.  Backward slashes can still be typed, but they are
	changed to forward slashes by Vim.
	Note that setting or resetting this option has no effect for some
	existing file names, thus this option needs to be set before opening
	any file for best results.  This might change in the future.
	'shellslash' only works when a backslash can be used as a path
	separator.  To test if this is so use: 
		if exists('+shellslash')
	Also see 'completeslash'.

			'shelltemp' 'stmp' 'noshelltemp' 'nostmp'
'shelltemp' 'stmp'	boolean	(Vi default off, Vim default on)
			global
	When on, use temp files for shell commands.  When off use a pipe.
	When using a pipe is not possible temp files are used anyway.
	Currently a pipe is only supported on Unix and MS-Windows 2K and
	later.  You can check it with: 
		:if has("filterpipe")
	The advantage of using a pipe is that nobody can read the temp file
	and the 'shell' command does not need to support redirection.
	The advantage of using a temp file is that the file type and encoding
	can be detected.
	The FilterReadPre, FilterReadPost and FilterWritePre,
	FilterWritePost autocommands event are not triggered when
	'shelltemp' is off.
	The system() function does not respect this option and always uses
	temp files.
	NOTE: This option is set to the Vim default value when 'compatible'
	is reset.

						'shelltype' 'st'
'shelltype' 'st'	number	(default 0)
			global
			{only for the Amiga}
	On the Amiga this option influences the way how the commands work
	which use a shell.
	0 and 1: always use the shell
	2 and 3: use the shell only to filter lines
	4 and 5: use shell only for ':sh' command
	When not using the shell, the command is executed directly.

	0 and 2: use "shell 'shellcmdflag' cmd" to start external commands
	1 and 3: use "shell cmd" to start external commands

						'shellxescape' 'sxe'
'shellxescape' 'sxe'	string	(default: "";
				 for MS-Windows: "\"&|<>()@^")
			global
	When 'shellxquote' is set to "(" then the characters listed in this
	option will be escaped with a '^' character.  This makes it possible
	to execute most external commands with cmd.exe.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'shellxquote' 'sxq'
'shellxquote' 'sxq'	string	(default: "";
					for Win32, when 'shell' is cmd.exe: "("
					for Win32, when 'shell' is
					powershell.exe: "\""
					for Win32, when 'shell' contains "sh"
					somewhere: "\""
					for Unix, when using system(): "\"")
			global
	Quoting character(s), put around the command passed to the shell, for
	the "!" and ":!" commands.  Includes the redirection.  See
	'shellquote' to exclude the redirection.  It's probably not useful
	to set both options.
	When the value is '(' then ')' is appended. When the value is '"('
	then ')"' is appended.
	When the value is '(' then also see 'shellxescape'.
	This is an empty string by default on most systems, but is known to be
	useful for on Win32 version, either for cmd.exe, powershell.exe, or
	pwsh.exe which automatically strips off the first and last quote on a
	command, or 3rd-party shells such as the MKS Korn Shell or bash, where
	it should be "\"".  The default is adjusted according the value of
	'shell', to reduce the need to set this option by the user.  See
	dos-shell.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

			'shiftround' 'sr' 'noshiftround' 'nosr'
'shiftround' 'sr'	boolean	(default off)
			global
	Round indent to multiple of 'shiftwidth'.  Applies to > and <
	commands.  CTRL-T and CTRL-D in Insert mode always round the indent to
	a multiple of 'shiftwidth' (this is Vi compatible).
	NOTE: This option is reset when 'compatible' is set.

						'shiftwidth' 'sw'
'shiftwidth' 'sw'	number	(default 8)
			local to buffer
	Number of spaces to use for each step of (auto)indent.  Used for
	'cindent', >>, <<, etc.
	When zero the 'tabstop' value will be used.  Use the shiftwidth()
	function to get the effective shiftwidth value.

						'shortmess' 'shm'
'shortmess' 'shm'	string	(Vim default "filnxtToOS", Vi default: "S",
							POSIX default: "AS")
			global					E1336
	This option helps to avoid all the hit-enter prompts caused by file
	messages, for example  with CTRL-G, and to avoid some other messages.
	It is a list of flags:
	 flag	meaning when present	
	  f	use "(3 of 5)" instead of "(file 3 of 5)"		shm-f
	  i	use "[noeol]" instead of "[Incomplete last line]"	shm-i
	  l	use "999L, 888B" instead of "999 lines, 888 bytes"	shm-l
	  m	use "[+]" instead of "[Modified]"			shm-m
	  n	use "[New]" instead of "[New File]"			shm-n
	  r	use "[RO]" instead of "[readonly]"			shm-r
	  w	use "[w]" instead of "written" for file write message	shm-w
		and "[a]" instead of "appended" for ':w >> file' command
	  x	use "[dos]" instead of "[dos format]", "[unix]"		shm-x
		instead of "[unix format]" and "[mac]" instead of "[mac
		format]"
	  a	all of the above abbreviations				shm-a

	  o	overwrite message for writing a file with subsequent	shm-o
		message for reading a file (useful for ":wn" or when
		'autowrite' on)
	  O	message for reading a file overwrites any previous	shm-O
		message;  also for quickfix message (e.g., ":cn")
	  s	don't give "search hit BOTTOM, continuing at TOP" or	shm-s
		"search hit TOP, continuing at BOTTOM" messages; when using
		the search count do not show "W" after the count message (see
		S below)
	  t	truncate file message at the start if it is too long	shm-t
		to fit on the command-line, "<" will appear in the left most
		column; ignored in Ex mode
	  T	truncate other messages in the middle if they are too	shm-T
		long to fit on the command line; "..." will appear in the
		middle; ignored in Ex mode
	  W	don't give "written" or "[w]" when writing a file	shm-W
	  A	don't give the "ATTENTION" message when an existing	shm-A
		swap file is found
	  I	don't give the intro message when starting Vim,		shm-I
		see :intro
	  c	don't give ins-completion-menu messages; for  		shm-c
		example, "-- XXX completion (YYY)", "match 1 of 2", "The only
		match", "Pattern not found", "Back at original", etc.
	  C	don't give messages while scanning for ins-completion	shm-C
		items, for instance "scanning tags"
	  q	use "recording" instead of "recording @a"		shm-q
	  F	don't give the file info when editing a file, like	shm-F
		:silent was used for the command; note that this also
		affects messages from autocommands
	  S	do not show search count message when searching, e.g.	shm-S
		"[1/5]"

	This gives you the opportunity to avoid that a change between buffers
	requires you to hit <Enter>, but still gives as useful a message as
	possible for the space available.  To get the whole message that you
	would have got with 'shm' empty, use ":file!"
	Useful values:
	    shm=	No abbreviation of message.
	    shm=a	Abbreviation, but no loss of information.
	    shm=at	Abbreviation, and truncate message when necessary.

	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

				 'shortname' 'sn' 'noshortname' 'nosn'
'shortname' 'sn'	boolean	(default off)
			local to buffer
	Filenames are assumed to be 8 characters plus one extension of 3
	characters.  Multiple dots in file names are not allowed.  When this
	option is on, dots in file names are replaced with underscores when
	adding an extension (".~" or ".swp").  This option is useful
	when editing files on an MS-DOS compatible filesystem, e.g., messydos
	or crossdos.

						'showbreak' 'sbr' E595
'showbreak' 'sbr'	string	(default "")
			global or local to window global-local
			{not available when compiled without the +linebreak
			feature}
	String to put at the start of lines that have been wrapped.  Useful
	values are "> " or "+++ ": 
		:set showbreak=>\ 
	Note the backslash to escape the trailing space.  It's easier like
	this: 
		:let &showbreak = '+++ '
	Only printable single-cell characters are allowed, excluding <Tab> and
	comma (in a future version the comma might be used to separate the
	part that is shown at the end and at the start of a line).
	The characters are highlighted according to the '@' flag in
	'highlight'.
	Note that tabs after the showbreak will be displayed differently.
	If you want the 'showbreak' to appear in between line numbers, add the
	"n" flag to 'cpoptions'.
	A window-local value overrules a global value.  If the global value is
	set and you want no value in the current window use NONE: 
		:setlocal showbreak=NONE

				     'showcmd' 'sc' 'noshowcmd' 'nosc'
'showcmd' 'sc'		boolean	(Vim default: on, off for Unix,
				       Vi default: off, set in defaults.vim)
			global
	Show (partial) command in the last line of the screen.  Set this
	option off if your terminal is slow.
	In Visual mode the size of the selected area is shown:
	- When selecting characters within a line, the number of characters.
	  If the number of bytes is different it is also displayed: "2-6"
	  means two characters and six bytes.
	- When selecting more than one line, the number of lines.
	- When selecting a block, the size in screen characters:
	  {lines}x{columns}.
	This information can be displayed in an alternative location using the
	'showcmdloc' option.
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

			'showcmdloc' 'sloc'
'showcmdloc' 'sloc'	string	(default "last")
			global
	This option can be used to display the (partially) entered command in
	another location.  Possible values are:
	  last		Last line of the screen (default).
	  statusline	Status line of the current window.
	  tabline	First line of the screen if 'showtabline' is enabled.
	Setting this option to "statusline" or "tabline" means that these will
	be redrawn whenever the command changes, which can be on every key
	pressed.
	The %S 'statusline' item can be used in 'statusline' or 'tabline' to
	place the text.  Without a custom 'statusline' or 'tabline' it will be
	displayed in a convenient location.

			'showfulltag' 'sft' 'noshowfulltag' 'nosft'
'showfulltag' 'sft'	boolean (default off)
			global
	When completing a word in insert mode (see ins-completion) from the
	tags file, show both the tag name and a tidied-up form of the search
	pattern (if there is one) as possible matches.  Thus, if you have
	matched a C function, you can see a template for what arguments are
	required (coding style permitting).
	Note that this doesn't work well together with having "longest" in
	'completeopt', because the completion from the search pattern may not
	match the typed text.

				 'showmatch' 'sm' 'noshowmatch' 'nosm'
'showmatch' 'sm'	boolean	(default off)
			global
	When a bracket is inserted, briefly jump to the matching one.  The
	jump is only done if the match can be seen on the screen.  The time to
	show the match can be set with 'matchtime'.
	A Beep is given if there is no match (no matter if the match can be
	seen or not).
	This option is reset when 'paste' is set and restored when 'paste' is
	reset.
	When the 'm' flag is not included in 'cpoptions', typing a character
	will immediately move the cursor back to where it belongs.
	See the "sm" field in 'guicursor' for setting the cursor shape and
	blinking when showing the match.
	The 'matchpairs' option can be used to specify the characters to show
	matches for.  'rightleft' and 'revins' are used to look for opposite
	matches.
	Also see the matchparen plugin for highlighting the match when moving
	around pi_paren.txt.
	Note: Use of the short form is rated PG.

				 'showmode' 'smd' 'noshowmode' 'nosmd'
'showmode' 'smd'	boolean	(Vim default: on, Vi default: off)
			global
	If in Insert, Replace or Visual mode put a message on the last line.
	Use the 'M' flag in 'highlight' to set the type of highlighting for
	this message.
	When XIM may be used the message will include "XIM".  But this
	doesn't mean XIM is really active, especially when 'imactivatekey' is
	not set.
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

						'showtabline' 'stal'
'showtabline' 'stal'	number	(default 1)
			global
	The value of this option specifies when the line with tab page labels
	will be displayed:
		0: never
		1: only if there are at least two tab pages
		2: always
	This is both for the GUI and non-GUI implementation of the tab pages
	line.
	See tab-page for more information about tab pages.

						'sidescroll' 'ss'
'sidescroll' 'ss'	number	(default 0)
			global
	The minimal number of columns to scroll horizontally.  Used only when
	the 'wrap' option is off and the cursor is moved off of the screen.
	When it is zero the cursor will be put in the middle of the screen.
	When using a slow terminal set it to a large number or 0.  When using
	a fast terminal use a small number or 1.  Not used for "zh" and "zl"
	commands.

						'sidescrolloff' 'siso'
'sidescrolloff' 'siso'	number (default 0)
			global or local to window global-local
	The minimal number of screen columns to keep to the left and to the
	right of the cursor if 'nowrap' is set.  Setting this option to a
	value greater than 0 while having 'sidescroll' also at a non-zero
	value makes some context visible in the line you are scrolling in
	horizontally (except at beginning of the line).  Setting this option
	to a large value (like 999) has the effect of keeping the cursor
	horizontally centered in the window, as long as one does not come too
	close to the beginning of the line.
	After using the local value, go back the global value with one of
	these two: 
		setlocal sidescrolloff<
		setlocal sidescrolloff=-1
	NOTE: This option is set to 0 when 'compatible' is set.

	Example: Try this together with 'sidescroll' and 'listchars' as
		 in the following example to never allow the cursor to move
		 onto the "extends" character: 

		 :set nowrap sidescroll=1 listchars=extends:>,precedes:<
		 :set sidescrolloff=1

						'signcolumn' 'scl'
'signcolumn' 'scl'	string	(default "auto")
			local to window
			{not available when compiled without the +signs
			feature}
	Whether or not to draw the signcolumn. Valid values are:
	   "auto"	only when there is a sign to display
	   "no"		never
	   "yes"	always
	   "number"	display signs in the 'number' column. If the number
			column is not present, then behaves like "auto".

			'smartcase' 'scs' 'nosmartcase' 'noscs'
'smartcase' 'scs'	boolean	(default off)
			global
	Override the 'ignorecase' option if the search pattern contains upper
	case characters.  Only used when the search pattern is typed and
	'ignorecase' option is on.  Used for the commands "/", "?", "n", "N",
	":g" and ":s".  Not used for "*", "#", "gd", tag search, etc.  After
	"*" and "#" you can make 'smartcase' used by doing a "/" command,
	recalling the search pattern from history and hitting <Enter>.
	NOTE: This option is reset when 'compatible' is set.

			     'smartindent' 'si' 'nosmartindent' 'nosi'
'smartindent' 'si'	boolean	(default off)
			local to buffer
	Do smart autoindenting when starting a new line.  Works for C-like
	programs, but can also be used for other languages.  'cindent' does
	something like this, works better in most cases, but is more strict,
	see C-indenting.  When 'cindent' is on or 'indentexpr' is set,
	setting 'si' has no effect.  'indentexpr' is a more advanced
	alternative.
	Normally 'autoindent' should also be on when using 'smartindent'.
	An indent is automatically inserted:
	- After a line ending in '{'.
	- After a line starting with a keyword from 'cinwords'.
	- Before a line starting with '}' (only with the "O" command).
	When typing '}' as the first character in a new line, that line is
	given the same indent as the matching '{'.
	When typing '#' as the first character in a new line, the indent for
	that line is removed, the '#' is put in the first column.  The indent
	is restored for the next line.  If you don't want this, use this
	mapping: ":inoremap # X^H#", where ^H is entered with CTRL-V CTRL-H.
	When using the ">>" command, lines starting with '#' are not shifted
	right.
	NOTE: This option is reset when 'compatible' is set.
	This option is reset when 'paste' is set and restored when 'paste' is
	reset.

				 'smarttab' 'sta' 'nosmarttab' 'nosta'
'smarttab' 'sta'	boolean	(default off)
			global
	When on, a <Tab> in front of a line inserts blanks according to
	'shiftwidth'.  'tabstop' or 'softtabstop' is used in other places.  A
	<BS> will delete a 'shiftwidth' worth of space at the start of the
	line.
	When off, a <Tab> always inserts blanks according to 'tabstop' or
	'softtabstop'.  'shiftwidth' is only used for shifting text left or
	right shift-left-right.
	What gets inserted (a <Tab> or spaces) depends on the 'expandtab'
	option.  Also see ins-expandtab.  When 'expandtab' is not set, the
	number of spaces is minimized by using <Tab>s.
	This option is reset when 'paste' is set and restored when 'paste' is
	reset.
	NOTE: This option is reset when 'compatible' is set.

			'smoothscroll' 'sms' 'nosmoothscroll' 'nosms'
'smoothscroll' 'sms'	boolean  (default off)
			local to window
	Scrolling works with screen lines.  When 'wrap' is set and the first
	line in the window wraps part of it may not be visible, as if it is
	above the window. "<<<" is displayed at the start of the first line,
	highlighted with hl-NonText.
	You may also want to add "lastline" to the 'display' option to show as
	much of the last line as possible.
	NOTE: only partly implemented, currently works with CTRL-E, CTRL-Y
	and scrolling with the mouse.

					'softtabstop' 'sts'
'softtabstop' 'sts'	number	(default 0)
			local to buffer
	Number of spaces that a <Tab> counts for while performing editing
	operations, like inserting a <Tab> or using <BS>.  It "feels" like
	<Tab>s are being inserted, while in fact a mix of spaces and <Tab>s is
	used.  This is useful to keep the 'ts' setting at its standard value
	of 8, while being able to edit like it is set to 'sts'.  However,
	commands like "x" still work on the actual characters.
	When 'sts' is zero, this feature is off.
	When 'sts' is negative, the value of 'shiftwidth' is used.
	'softtabstop' is set to 0 when the 'paste' option is set and restored
	when 'paste' is reset.
	See also ins-expandtab.  When 'expandtab' is not set, the number of
	spaces is minimized by using <Tab>s.
	The 'L' flag in 'cpoptions' changes how tabs are used when 'list' is
	set.
	NOTE: This option is set to 0 when 'compatible' is set.

	If Vim is compiled with the +vartabs feature then the value of
	'softtabstop' will be ignored if 'varsofttabstop' is set to
	anything other than an empty string.

						'spell' 'nospell'
'spell'			boolean	(default off)
			local to window
			{not available when compiled without the +syntax
			feature}
	When on spell checking will be done.  See spell.
	The languages are specified with 'spelllang'.

						'spellcapcheck' 'spc'
'spellcapcheck' 'spc'	string	(default "[.?!]\_[\])'" \t]\+")
			local to buffer
			{not available when compiled without the +syntax
			feature}
	Pattern to locate the end of a sentence.  The following word will be
	checked to start with a capital letter.  If not then it is highlighted
	with SpellCap hl-SpellCap (unless the word is also badly spelled).
	When this check is not wanted make this option empty.
	Only used when 'spell' is set.
	Be careful with special characters, see option-backslash about
	including spaces and backslashes.
	To set this option automatically depending on the language, see
	set-spc-auto.

						'spellfile' 'spf'
'spellfile' 'spf'	string	(default empty)
			local to buffer
			{not available when compiled without the +syntax
			feature}
	Name of the word list file where words are added for the zg and zw
	commands.  It must end in ".{encoding}.add".  You need to include the
	path, otherwise the file is placed in the current directory.
	The path may include characters from 'isfname', space, comma and '@'.
								E765
	It may also be a comma-separated list of names.  A count before the
	zg and zw commands can be used to access each.  This allows using
	a personal word list file and a project word list file.
	When a word is added while this option is empty Vim will set it for
	you: Using the first directory in 'runtimepath' that is writable.  If
	there is no "spell" directory yet it will be created.  For the file
	name the first language name that appears in 'spelllang' is used,
	ignoring the region.
	The resulting ".spl" file will be used for spell checking, it does not
	have to appear in 'spelllang'.
	Normally one file is used for all regions, but you can add the region
	name if you want to.  However, it will then only be used when
	'spellfile' is set to it, for entries in 'spelllang' only files
	without region name will be found.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'spelllang' 'spl'
'spelllang' 'spl'	string	(default "en")
			local to buffer
			{not available when compiled without the +syntax
			feature}
	A comma-separated list of word list names.  When the 'spell' option is
	on spellchecking will be done for these languages.  Example: 
		set spelllang=en_us,nl,medical
	This means US English, Dutch and medical words are recognized.  Words
	that are not recognized will be highlighted.
	The word list name must consist of alphanumeric characters, a dash or
	an underscore.  It should not include a comma or dot.  Using a dash is
	recommended to separate the two letter language name from a
	specification.  Thus "en-rare" is used for rare English words.
	A region name must come last and have the form "_xx", where "xx" is
	the two-letter, lower case region name.  You can use more than one
	region by listing them: "en_us,en_ca" supports both US and Canadian
	English, but not words specific for Australia, New Zealand or Great
	Britain. (Note: currently en_au and en_nz dictionaries are older than
	en_ca, en_gb and en_us).
	If the name "cjk" is included East Asian characters are excluded from
	spell checking.  This is useful when editing text that also has Asian
	words.
	Note that the "medical" dictionary does not exist, it is just an
	example of a longer name.
							E757
	As a special case the name of a .spl file can be given as-is.  The
	first "_xx" in the name is removed and used as the region name
	(_xx is an underscore, two letters and followed by a non-letter).
	This is mainly for testing purposes.  You must make sure the correct
	encoding is used, Vim doesn't check it.
	When 'encoding' is set the word lists are reloaded.  Thus it's a good
	idea to set 'spelllang' after setting 'encoding' to avoid loading the
	files twice.
	How the related spell files are found is explained here: spell-load.

	If the spellfile.vim plugin is active and you use a language name
	for which Vim cannot find the .spl file in 'runtimepath' the plugin
	will ask you if you want to download the file.

	After this option has been set successfully, Vim will source the files
	"spell/LANG.vim" in 'runtimepath'.  "LANG" is the value of 'spelllang'
	up to the first character that is not an ASCII letter or number and
	not a dash.  Also see set-spc-auto.

						'spelloptions' 'spo'
'spelloptions' 'spo'	string	(default "")
			local to buffer
			{not available when compiled without the +syntax
			feature}
	A comma-separated list of options for spell checking:
	   camel	When a word is CamelCased, assume "Cased" is a
			separate word: every upper-case character in a word
			that comes after a lower case character indicates the
			start of a new word.

						'spellsuggest' 'sps'
'spellsuggest' 'sps'	string	(default "best")
			global
			{not available when compiled without the +syntax
			feature}
	Methods used for spelling suggestions.  Both for the z= command and
	the spellsuggest() function.  This is a comma-separated list of
	items:

	best		Internal method that works best for English.  Finds
			changes like "fast" and uses a bit of sound-a-like
			scoring to improve the ordering.

	double		Internal method that uses two methods and mixes the
			results.  The first method is "fast", the other method
			computes how much the suggestion sounds like the bad
			word.  That only works when the language specifies
			sound folding.  Can be slow and doesn't always give
			better results.

	fast		Internal method that only checks for simple changes:
			character inserts/deletes/swaps.  Works well for
			simple typing mistakes.

	{number}	The maximum number of suggestions listed for z=.
			Not used for spellsuggest().  The number of
			suggestions is never more than the value of 'lines'
			minus two.

	timeout:{millisec}   Limit the time searching for suggestions to
			{millisec} milli seconds.  Applies to the following
			methods.  When omitted the limit is 5000. When
			negative there is no limit.  {only works when built
			with the +reltime feature}

	file:{filename} Read file {filename}, which must have two columns,
			separated by a slash.  The first column contains the
			bad word, the second column the suggested good word.
			Example:
				theribal/terrible 
			Use this for common mistakes that do not appear at the
			top of the suggestion list with the internal methods.
			Lines without a slash are ignored, use this for
			comments.
			The word in the second column must be correct,
			otherwise it will not be used.  Add the word to an
			".add" file if it is currently flagged as a spelling
			mistake.
			The file is used for all languages.

	expr:{expr}	Evaluate expression {expr}.  Use a function to avoid
			trouble with spaces.  Best is to call a function
			without arguments, see expr-option-function.
			v:val holds the badly spelled word.  The expression
			must evaluate to a List of Lists, each with a
			suggestion and a score.
			Example:
				[['the', 33], ['that', 44]] 
			Set 'verbose' and use z= to see the scores that the
			internal methods use.  A lower score is better.
			This may invoke spellsuggest() if you temporarily
			set 'spellsuggest' to exclude the "expr:" part.
			Errors are silently ignored, unless you set the
			'verbose' option to a non-zero value.

	Only one of "best", "double" or "fast" may be used.  The others may
	appear several times in any order.  Example: 
		:set sps=file:~/.vim/sugg,best,expr:MySuggest()

	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

			'splitbelow' 'sb' 'nosplitbelow' 'nosb'
'splitbelow' 'sb'	boolean	(default off)
			global
	When on, splitting a window will put the new window below the current
	one. :split

			'splitkeep' 'spk'
'splitkeep' 'spk'	string	(default "cursor")
			global
	The value of this option determines the scroll behavior when opening,
	closing or resizing horizontal splits.

	Possible values are:
	  cursor	Keep the same relative cursor position.
	  screen	Keep the text on the same screen line.
	  topline	Keep the topline the same.

	For the "screen" and "topline" values, the cursor position will be
	changed when necessary. In this case, the jumplist will be populated
	with the previous cursor position. For "screen", the text cannot always
	be kept on the same screen line when 'wrap' is enabled.

			'splitright' 'spr' 'nosplitright' 'nospr'
'splitright' 'spr'	boolean	(default off)
			global
	When on, splitting a window will put the new window right of the
	current one. :vsplit

			   'startofline' 'sol' 'nostartofline' 'nosol'
'startofline' 'sol'	boolean	(default on)
			global
	When "on" the commands listed below move the cursor to the first
	non-blank of the line.  When off the cursor is kept in the same column
	(if possible).  This applies to the commands:
	- CTRL-D, CTRL-U, CTRL-B, CTRL-F, "G", "H", "M", "L", "gg"
	- "d", "<<" and ">>" with a linewise operator
	- "%" with a count
	- buffer changing commands (CTRL-^, :bnext, :bNext, etc.)
	- Ex commands that only has a line number, e.g., ":25" or ":+".
	In case of buffer changing commands the cursor is placed at the column
	where it was the last time the buffer was edited.
	NOTE: This option is set when 'compatible' is set.

			   'statusline' 'stl' E540 E542
'statusline' 'stl'	string	(default empty)
			global or local to window global-local
			{not available when compiled without the +statusline
			feature}
	When non-empty, this option determines the content of the status line.
	Also see status-line.

	The option consists of printf style '%' items interspersed with
	normal text.  Each status line item is of the form:
	  %-0{minwid}.{maxwid}{item}
	All fields except the {item} are optional.  A single percent sign can
	be given as "%%".

	When the option starts with "%!" then it is used as an expression,
	evaluated and the result is used as the option value.  Example: 
		:set statusline=%!MyStatusLine()
	The g:statusline_winid variable will be set to the window-ID of the
	window that the status line belongs to.
	The result can contain %{} items that will be evaluated too.
	Note that the "%!" expression is evaluated in the context of the
	current window and buffer, while %{} items are evaluated in the
	context of the window that the statusline belongs to.

	When there is error while evaluating the option then it will be made
	empty to avoid further errors.  Otherwise screen updating would loop.
	When the result contains unprintable characters the result is
	unpredictable.

	Note that the only effect of 'ruler' when this option is set (and
	'laststatus' is 2) is controlling the output of CTRL-G.

	field	    meaning 
	-	    Left justify the item.  The default is right justified
		    when minwid is larger than the length of the item.
	0	    Leading zeroes in numeric items.  Overridden by '-'.
	minwid	    Minimum width of the item, padding as set by '-' & '0'.
		    Value must be 50 or less.
	maxwid	    Maximum width of the item.  Truncation occurs with a '<'
		    on the left for text items.  Numeric items will be
		    shifted down to maxwid-2 digits followed by '>'number
		    where number is the amount of missing digits, much like
		    an exponential notation.
	item	    A one letter code as described below.

	Following is a description of the possible statusline items.  The
	second character in "item" is the type:
		N for number
		S for string
		F for flags as described below
		- not applicable

	item  meaning 
	f S   Path to the file in the buffer, as typed or relative to current
	      directory.
	F S   Full path to the file in the buffer.
	t S   File name (tail) of file in the buffer.
	m F   Modified flag, text is "[+]"; "[-]" if 'modifiable' is off.
	M F   Modified flag, text is ",+" or ",-".
	r F   Readonly flag, text is "[RO]".
	R F   Readonly flag, text is ",RO".
	h F   Help buffer flag, text is "[help]".
	H F   Help buffer flag, text is ",HLP".
	w F   Preview window flag, text is "[Preview]".
	W F   Preview window flag, text is ",PRV".
	y F   Type of file in the buffer, e.g., "[vim]".  See 'filetype'.
	Y F   Type of file in the buffer, e.g., ",VIM".  See 'filetype'.
	q S   "[Quickfix List]", "[Location List]" or empty.
	k S   Value of "b:keymap_name" or 'keymap' when :lmap mappings are
	      being used: "<keymap>"
	n N   Buffer number.
	b N   Value of character under cursor.
	B N   As above, in hexadecimal.
	o N   Byte number in file of byte under cursor, first byte is 1.
	      Mnemonic: Offset from start of file (with one added)
	      {not available when compiled without |+byte_offset| feature}
	O N   As above, in hexadecimal.
	N N   Printer page number.  (Only works in the 'printheader' option.)
	l N   Line number.
	L N   Number of lines in buffer.
	c N   Column number (byte index).
	v N   Virtual column number (screen column).
	V N   Virtual column number as -{num}.  Not displayed if equal to 'c'.
	p N   Percentage through file in lines as in CTRL-G.
	P S   Percentage through file of displayed window.  This is like the
	      percentage described for 'ruler'.  Always 3 in length, unless
	      translated.
	S S   'showcmd' content, see 'showcmdloc'.
	a S   Argument list status as in default title.  ({current} of {max})
	      Empty if the argument file count is zero or one.
	{ NF  Evaluate expression between '%{' and '}' and substitute result.
	      Note that there is no '%' before the closing '}'.  The
	      expression cannot contain a '}' character, call a function to
	      work around that.  See stl-%{ below.
	{% -  This is almost same as { except the result of the expression is
	      re-evaluated as a statusline format string.  Thus if the
	      return value of expr contains % items they will get expanded.
	      The expression can contain the } character, the end of
	      expression is denoted by %}.
	      For example: 
		func! Stl_filename() abort
		    return "%t"
		endfunc
	        stl=%{Stl_filename()}   results in "%t"
	        stl=%{%Stl_filename()%} results in `"Name of current file"`
	%} -  End of {% expression
	( -   Start of item group.  Can be used for setting the width and
	      alignment of a section.  Must be followed by %) somewhere.
	) -   End of item group.  No width fields allowed.
	T N   For 'tabline': start of tab page N label.  Use %T after the last
	      label.  This information is used for mouse clicks.
	X N   For 'tabline': start of close tab N label.  Use %X after the
	      label, e.g.: %3Xclose%X.  Use %999X for a "close current tab"
	      mark.  This information is used for mouse clicks.
	< -   Where to truncate line if too long.  Default is at the start.
	      No width fields allowed.
	= -   Separation point between alignment sections.  Each section will
	      be separated by an equal number of spaces.  With one %= what
	      comes after it will be right-aligned.  With two %= there is a
	      middle part, with white space left and right of it.
	      No width fields allowed.
	# -   Set highlight group.  The name must follow and then a # again.
	      Thus use %#HLname# for highlight group HLname.  The same
	      highlighting is used, also for the statusline of non-current
	      windows.
	* -   Set highlight group to User{N}, where {N} is taken from the
	      minwid field, e.g. %1*.  Restore normal highlight with %* or %0*.
	      The difference between User{N} and StatusLine will be applied to
	      StatusLineNC for the statusline of non-current windows.
	      The number N must be between 1 and 9.  See hl-User1..9

	When displaying a flag, Vim removes the leading comma, if any, when
	that flag comes right after plaintext.  This will make a nice display
	when flags are used like in the examples below.

	When all items in a group becomes an empty string (i.e. flags that are
	not set) and a minwid is not set for the group, the whole group will
	become empty.  This will make a group like the following disappear
	completely from the statusline when none of the flags are set. 
		:set statusline=...%(\ [%M%R%H]%)...
	Beware that an expression is evaluated each and every time the status
	line is displayed.
				stl-%{ g:actual_curbuf g:actual_curwin
	While evaluating %{} the current buffer and current window will be set
	temporarily to that of the window (and buffer) whose statusline is
	currently being drawn.  The expression will evaluate in this context.
	The variable "g:actual_curbuf" is set to the bufnr() number of the
	real current buffer and "g:actual_curwin" to the window-ID of the
	real current window.  These values are strings.

	The 'statusline' option will be evaluated in the sandbox if set from
	a modeline, see sandbox-option.
	This option cannot be set in a modeline when 'modelineexpr' is off.

	It is not allowed to change text or jump to another window while
	evaluating 'statusline' textlock.

	If the statusline is not updated when you want it (e.g., after setting
	a variable that's used in an expression), you can force an update by
	using :redrawstatus.

	A result of all digits is regarded a number for display purposes.
	Otherwise the result is taken as flag text and applied to the rules
	described above.

	Watch out for errors in expressions.  They may render Vim unusable!
	If you are stuck, hold down ':' or 'Q' to get a prompt, then quit and
	edit your .vimrc or whatever with "vim --clean" to get it right.

	Examples:
	Emulate standard status line with 'ruler' set 
	  :set statusline=%<%f\ %h%m%r%=%-14.(%l,%c%V%)\ %P
	Similar, but add ASCII value of char under the cursor (like "ga") 
	  :set statusline=%<%f%h%m%r%=%b\ 0x%B\ \ %l,%c%V\ %P
	Display byte count and byte value, modified flag in red. 
	  :set statusline=%<%f%=\ [%1*%M%*%n%R%H]\ %-19(%3l,%02c%03V%)%O'%02b'
	  :hi User1 term=inverse,bold cterm=inverse,bold ctermfg=red
	Display a ,GZ flag if a compressed file is loaded 
	  :set statusline=...%r%{VarExists('b:gzflag','\ [GZ]')}%h...
	In the :autocmd's: 
	  :let b:gzflag = 1
	And: 
	  :unlet b:gzflag
	And define this function: 
	  :function VarExists(var, val)
	  :    if exists(a:var) | return a:val | else | return '' | endif
	  :endfunction

						'suffixes' 'su'
'suffixes' 'su'		string	(default ".bak,~,.o,.h,.info,.swp,.obj")
			global
	Files with these suffixes get a lower priority when multiple files
	match a wildcard.  See suffixes.  Commas can be used to separate the
	suffixes.  Spaces after the comma are ignored.  A dot is also seen as
	the start of a suffix.  To avoid a dot or comma being recognized as a
	separator, precede it with a backslash (see option-backslash about
	including spaces and backslashes).
	See 'wildignore' for completely ignoring files.
	The use of :set+= and :set-= is preferred when adding or removing
	suffixes from the list.  This avoids problems when a future version
	uses another default.

						'suffixesadd' 'sua'
'suffixesadd' 'sua'	string	(default "")
			local to buffer
	Comma-separated list of suffixes, which are used when searching for a
	file for the "gf", "[I", etc. commands.  Example: 
		:set suffixesadd=.java

				'swapfile' 'swf' 'noswapfile' 'noswf'
'swapfile' 'swf'	boolean (default on)
			local to buffer
	Use a swapfile for the buffer.  This option can be reset when a
	swapfile is not wanted for a specific buffer.  For example, with
	confidential information that even root must not be able to access.
	Careful: All text will be in memory:
		- Don't use this for big files.
		- Recovery will be impossible!
	A swapfile will only be present when 'updatecount' is non-zero and
	'swapfile' is set.
	When 'swapfile' is reset, the swap file for the current buffer is
	immediately deleted.  When 'swapfile' is set, and 'updatecount' is
	non-zero, a swap file is immediately created.
	Also see swap-file and 'swapsync'.
	If you want to open a new buffer without creating a swap file for it,
	use the :noswapfile modifier.
	See 'directory' for where the swap file is created.

	This option is used together with 'bufhidden' and 'buftype' to
	specify special kinds of buffers.   See special-buffers.

						'swapsync' 'sws'
'swapsync' 'sws'	string	(default "fsync")
			global
	When this option is not empty a swap file is synced to disk after
	writing to it.  This takes some time, especially on busy unix systems.
	When this option is empty parts of the swap file may be in memory and
	not written to disk.  When the system crashes you may lose more work.
	On Unix the system does a sync now and then without Vim asking for it,
	so the disadvantage of setting this option off is small.  On some
	systems the swap file will not be written at all.  For a unix system
	setting it to "sync" will use the sync() call instead of the default
	fsync(), which may work better on some systems.
	The 'fsync' option is used for the actual file.

						'switchbuf' 'swb'
'switchbuf' 'swb'	string	(default "")
			global
	This option controls the behavior when switching between buffers.
	This option is checked, when
	- jumping to errors with the quickfix commands (:cc, :cn, :cp,
	  etc.).
	- jumping to a tag using the :stag command.
	- opening a file using the CTRL-W_f or CTRL-W_F command.
	- jumping to a buffer using a buffer split command (e.g.  :sbuffer,
	  :sbnext, or :sbrewind).
	Possible values (comma-separated list):
	   useopen	If included, jump to the first open window in the
			current tab page that contains the specified buffer
			(if there is one).  Otherwise: Do not examine other
			windows.
	   usetab	Like "useopen", but also consider windows in other tab
			pages.
	   split	If included, split the current window before loading
			a buffer for a quickfix command that display errors.
			Otherwise: do not split, use current window (when used
			in the quickfix window: the previously used window or
			split if there is no other window).
	   vsplit	Just like "split" but split vertically.
	   newtab	Like "split", but open a new tab page.  Overrules
			"split" when both are present.
	   uselast	If included, jump to the previously used window when
			jumping to errors with quickfix commands.

						'synmaxcol' 'smc'
'synmaxcol' 'smc'	number	(default 3000)
			local to buffer
			{not available when compiled without the +syntax
			feature}
	Maximum column in which to search for syntax items.  In long lines the
	text after this column is not highlighted and following lines may not
	be highlighted correctly, because the syntax state is cleared.
	This helps to avoid very slow redrawing for an XML file that is one
	long line.
	Set to zero to remove the limit.

						'syntax' 'syn'
'syntax' 'syn'		string	(default empty)
			local to buffer  local-noglobal
			{not available when compiled without the +syntax
			feature}
	When this option is set, the syntax with this name is loaded, unless
	syntax highlighting has been switched off with ":syntax off".
	Otherwise this option does not always reflect the current syntax (the
	b:current_syntax variable does).
	This option is most useful in a modeline, for a file which syntax is
	not automatically recognized.  Example, in an IDL file:
		/* vim: set syntax=idl : */ 
	When a dot appears in the value then this separates two filetype
	names.  Example:
		/* vim: set syntax=c.doxygen : */ 
	This will use the "c" syntax first, then the "doxygen" syntax.
	Note that the second one must be prepared to be loaded as an addition,
	otherwise it will be skipped.  More than one dot may appear.
	To switch off syntax highlighting for the current file, use: 
		:set syntax=OFF
	To switch syntax highlighting on according to the current value of the
	'filetype' option: 
		:set syntax=ON
	What actually happens when setting the 'syntax' option is that the
	Syntax autocommand event is triggered with the value as argument.
	This option is not copied to another buffer, independent of the 's' or
	'S' flag in 'cpoptions'.
	Only normal file name characters can be used, "/\*?[|<>" are illegal.

						'tabline' 'tal'
'tabline' 'tal'		string	(default empty)
			global
	When non-empty, this option determines the content of the tab pages
	line at the top of the Vim window.  When empty Vim will use a default
	tab pages line.  See setting-tabline for more info.

	The tab pages line only appears as specified with the 'showtabline'
	option and only when there is no GUI tab line.  When 'e' is in
	'guioptions' and the GUI supports a tab line 'guitablabel' is used
	instead.  Note that the two tab pages lines are very different.

	The value is evaluated like with 'statusline'.  You can use
	tabpagenr(), tabpagewinnr() and tabpagebuflist() to figure out
	the text to be displayed.  Use "%1T" for the first label, "%2T" for
	the second one, etc.  Use "%X" items for closing labels.

	When changing something that is used in 'tabline' that does not
	trigger it to be updated, use :redrawtabline.
	This option cannot be set in a modeline when 'modelineexpr' is off.

	Keep in mind that only one of the tab pages is the current one, others
	are invisible and you can't jump to their windows.

						'tabpagemax' 'tpm'
'tabpagemax' 'tpm'	number	(default 10)
			global
	Maximum number of tab pages to be opened by the -p command line
	argument or the ":tab all" command. tabpage

						'tabstop' 'ts'
'tabstop' 'ts'		number	(default 8)
			local to buffer
	Number of spaces that a <Tab> in the file counts for.  Also see
	the :retab command, and the 'softtabstop' option.

	Note: Setting 'tabstop' to any other value than 8 can make your file
	appear wrong in many places, e.g., when printing it.
	The value must be more than 0 and less than 10000.

	There are four main ways to use tabs in Vim:
	1. Always keep 'tabstop' at 8, set 'softtabstop' and 'shiftwidth' to 4
	   (or 3 or whatever you prefer) and use 'noexpandtab'.  Then Vim
	   will use a mix of tabs and spaces, but typing <Tab> and <BS> will
	   behave like a tab appears every 4 (or 3) characters.
	   This is the recommended way, the file will look the same with other
	   tools and when listing it in a terminal.
	2. Set 'softtabstop' and 'shiftwidth' to whatever you prefer and use
	   'expandtab'.  This way you will always insert spaces.  The
	   formatting will never be messed up when 'tabstop' is changed (leave
	   it at 8 just in case).  The file will be a bit larger.
	   You do need to check if no Tabs exist in the file.  You can get rid
	   of them by first setting 'expandtab' and using %retab!, making
	   sure the value of 'tabstop' is set correctly.
	3. Set 'tabstop' and 'shiftwidth' to whatever you prefer and use
	   'expandtab'.  This way you will always insert spaces.  The
	   formatting will never be messed up when 'tabstop' is changed.
	   You do need to check if no Tabs exist in the file, just like in the
	   item just above.
	4. Set 'tabstop' and 'shiftwidth' to whatever you prefer and use a
	   modeline to set these values when editing the file again.  Only
	   works when using Vim to edit the file, other tools assume a tabstop
	   is worth 8 spaces.
	5. Always set 'tabstop' and 'shiftwidth' to the same value, and
	   'noexpandtab'.  This should then work (for initial indents only)
	   for any tabstop setting that people use.  It might be nice to have
	   tabs after the first non-blank inserted as spaces if you do this
	   though.  Otherwise aligned comments will be wrong when 'tabstop' is
	   changed.

	If Vim is compiled with the +vartabs feature then the value of
	'tabstop' will be ignored if 'vartabstop' is set to anything other
	than an empty string.

			'tagbsearch' 'tbs' 'notagbsearch' 'notbs'
'tagbsearch' 'tbs'	boolean	(default on)
			global
	When searching for a tag (e.g., for the :ta command), Vim can either
	use a binary search or a linear search in a tags file.  Binary
	searching makes searching for a tag a LOT faster, but a linear search
	will find more tags if the tags file wasn't properly sorted.
	Vim normally assumes that your tags files are sorted, or indicate that
	they are not sorted.  Only when this is not the case does the
	'tagbsearch' option need to be switched off.

	When 'tagbsearch' is on, binary searching is first used in the tags
	files.  In certain situations, Vim will do a linear search instead for
	certain files, or retry all files with a linear search.  When
	'tagbsearch' is off, only a linear search is done.

	Linear searching is done anyway, for one file, when Vim finds a line
	at the start of the file indicating that it's not sorted: 
   !_TAG_FILE_SORTED	0	/some comment/
	[The whitespace before and after the '0' must be a single <Tab>]

	When a binary search was done and no match was found in any of the
	files listed in 'tags', and case is ignored or a pattern is used
	instead of a normal tag name, a retry is done with a linear search.
	Tags in unsorted tags files, and matches with different case will only
	be found in the retry.

	If a tag file indicates that it is case-fold sorted, the second,
	linear search can be avoided when case is ignored.  Use a value of '2'
	in the "!_TAG_FILE_SORTED" line for this.  A tag file can be case-fold
	sorted with the -f switch to "sort" in most unices, as in the command:
	"sort -f -o tags tags".  For Universal ctags and Exuberant ctags
	version 5.x or higher (at least 5.5) the --sort=foldcase switch can be
	used for this as well.  Note that case must be folded to uppercase for
	this to work.

	By default, tag searches are case-sensitive.  Case is ignored when
	'ignorecase' is set and 'tagcase' is "followic", or when 'tagcase' is
	"ignore".
	Also when 'tagcase' is "followscs" and 'smartcase' is set, or
	'tagcase' is "smart", and the pattern contains only lowercase
	characters.

	When 'tagbsearch' is off, tags searching is slower when a full match
	exists, but faster when no full match exists.  Tags in unsorted tags
	files may only be found with 'tagbsearch' off.
	When the tags file is not sorted, or sorted in a wrong way (not on
	ASCII byte value), 'tagbsearch' should be off, or the line given above
	must be included in the tags file.
	This option doesn't affect commands that find all matching tags (e.g.,
	command-line completion and ":help").

							'tagcase' 'tc'
'tagcase' 'tc'		string	(default "followic")
			global or local to buffer global-local
	This option specifies how case is handled when searching the tags
	file:
	   followic	Follow the 'ignorecase' option
	   followscs    Follow the 'smartcase' and 'ignorecase' options
	   ignore	Ignore case
	   match	Match case
	   smart	Ignore case unless an upper case letter is used
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

							'tagfunc' 'tfu'
'tagfunc' 'tfu'		string	(default: empty)
			local to buffer
			{not available when compiled without the +eval
			feature}
	This option specifies a function to be used to perform tag searches.
	The function gets the tag pattern and should return a List of matching
	tags.  See tag-function for an explanation of how to write the
	function and an example.  The value can be the name of a function, a
	lambda or a Funcref. See option-value-function for more
	information.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'taglength' 'tl'
'taglength' 'tl'	number	(default 0)
			global
	If non-zero, tags are significant up to this number of characters.

			'tagrelative' 'tr' 'notagrelative' 'notr'
'tagrelative' 'tr'	boolean	(Vim default: on, Vi default: off)
			global
	If on and using a tags file in another directory, file names in that
	tags file are relative to the directory where the tags file is.
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

						'tags' 'tag' E433
'tags' 'tag'		string	(default "./tags,tags", when compiled with
				+emacs_tags: "./tags,./TAGS,tags,TAGS")
			global or local to buffer global-local
	Filenames for the tag command, separated by spaces or commas.  To
	include a space or comma in a file name, precede it with backslashes
	(see option-backslash about including spaces/commas and backslashes).
	When a file name starts with "./", the '.' is replaced with the path
	of the current file.  But only when the 'd' flag is not included in
	'cpoptions'.  Environment variables are expanded :set_env.  Also see
	tags-option.
	"*", "**" and other wildcards can be used to search for tags files in
	a directory tree.  See file-searching.  E.g., "/lib/**/tags" will
	find all files named "tags" below "/lib".  The filename itself cannot
	contain wildcards, it is used as-is.  E.g., "/lib/**/tags?" will find
	files called "tags?".
	The tagfiles() function can be used to get a list of the file names
	actually used.
	If Vim was compiled with the +emacs_tags feature, Emacs-style tag
	files are also supported.  They are automatically recognized.  The
	default value becomes "./tags,./TAGS,tags,TAGS", unless case
	differences are ignored (MS-Windows).  emacs-tags
	The use of :set+= and :set-= is preferred when adding or removing
	file names from the list.  This avoids problems when a future version
	uses another default.

				'tagstack' 'tgst' 'notagstack' 'notgst'
'tagstack' 'tgst'	boolean	(default on)
			global
	When on, the tagstack is used normally.  When off, a ":tag" or
	":tselect" command with an argument will not push the tag onto the
	tagstack.  A following ":tag" without an argument, a ":pop" command or
	any other command that uses the tagstack will use the unmodified
	tagstack, but does change the pointer to the active entry.
	Resetting this option is useful when using a ":tag" command in a
	mapping which should not change the tagstack.

						'tcldll'
'tcldll'		string	(default depends on the build)
			global
			{only available when compiled with the +tcl/dyn
			feature}
	Specifies the name of the Tcl shared library. The default is
	DYNAMIC_TCL_DLL, which was specified at compile time.
	Environment variables are expanded :set_env.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'term' E529 E530 E531
'term'			string	(default is $TERM, if that fails:
				      in the GUI: "builtin_gui"
					on Amiga: "amiga"
					on Haiku: "xterm"
					  on Mac: "mac-ansi"
					 on Unix: "ansi"
					  on VMS: "ansi"
				       on Win 32: "win32")
			global
	Name of the terminal.  Used for choosing the terminal control
	characters.  Environment variables are expanded :set_env.
	For example: 
		:set term=$TERM
	See termcap.

						'termbidi' 'tbidi'
						'notermbidi' 'notbidi'
'termbidi' 'tbidi'	boolean (default off, on for "mlterm")
			global
			{only available when compiled with the +arabic
			feature}
	The terminal is in charge of Bi-directionality of text (as specified
	by Unicode).  The terminal is also expected to do the required shaping
	that some languages (such as Arabic) require.
	Setting this option implies that 'rightleft' will not be set when
	'arabic' is set and the value of 'arabicshape' will be ignored.
	Note that setting 'termbidi' has the immediate effect that
	'arabicshape' is ignored, but 'rightleft' isn't changed automatically.
	This option is reset when the GUI is started.
	For further details see arabic.txt.

					'termencoding' 'tenc'
'termencoding' 'tenc'	string	(default ""
				 with GTK+ and MacVim GUIs: "utf-8")
			global
	Encoding used for the terminal.  This specifies what character
	encoding the keyboard produces and the display will understand.  For
	the GUI it only applies to the keyboard ('encoding' is used for the
	display).
								E617 E950
	Note: This does not apply to the GTK+ and MacVim GUIs.  After the GUI
	has been successfully initialized, 'termencoding' is forcibly set to
	"utf-8".  Any attempts to set a different value will be rejected, and
	an error message is shown.
	For the Win32 GUI and console versions 'termencoding' is not used,
	because the Win32 system always passes Unicode characters.
	When empty, the same encoding is used as for the 'encoding' option.
	This is the normal value.
	Not all combinations for 'termencoding' and 'encoding' are valid.  See
	encoding-table.
	The value for this option must be supported by internal conversions or
	iconv().  When this is not possible no conversion will be done and you
	will probably experience problems with non-ASCII characters.
	Example: You are working with the locale set to euc-jp (Japanese) and
	want to edit a UTF-8 file: 
		:let &termencoding = &encoding
		:set encoding=utf-8
	You need to do this when your system has no locale support for UTF-8.

		'termguicolors' 'tgc' 'notermguicolors' 'notgc' E954
'termguicolors' 'tgc'	boolean (default off)
			global
			{not available when compiled without the
			+termguicolors feature}
	When on, uses highlight-guifg and highlight-guibg attributes in
	the terminal (thus using 24-bit color).

	Requires a ISO-8613-3 compatible terminal.  If setting this option
	does not work (produces a colorless UI) reading xterm-true-color
	might help.

	For Win32 console, Windows 10 version 1703 (Creators Update) or later
	is required. Use this check to find out: 
		if has('vcon')
	This requires Vim to be built with the +vtp feature.

	Note that the "cterm" attributes are still used, not the "gui" ones.

	When using Vim with Windows Terminal, the background of Windows
	Terminal is normally filled with the Vim background color.  Setting
	'termguicolors' and the guibg of the Normal highlight group to NONE
	will make the background transparent: 
		:hi Normal guibg=NONE

	NOTE: This option is reset when 'compatible' is set.

						'termwinkey' 'twk'
'termwinkey' 'twk'	string	(default "")
			local to window
	The key that starts a CTRL-W command in a terminal window.  Other keys
	are sent to the job running in the window.
	The <> notation can be used, e.g.: 
		:set termwinkey=<C-L>
	The string must be one key stroke but can be multiple bytes.
	When not set CTRL-W is used, so that CTRL-W : gets you to the command
	line.  If 'termwinkey' is set to CTRL-L then CTRL-L : gets you to the
	command line.

						'termwinscroll' 'twsl'
'termwinscroll' 'twsl'	number	(default 10000)
			local to buffer
			{not available when compiled without the
			+terminal feature}
	Number of scrollback lines to keep.  When going over this limit the
	first 10% of the scrollback lines are deleted.  This is just to reduce
	the memory usage.  See Terminal-Normal.
	Also used as a limit for text sent to the terminal in one write,
	multiplied by the number of columns times 3 (average number of bytes
	per cell).

						'termwinsize' 'tws'
'termwinsize' 'tws'	string	(default "")
			local to window
	Size used when opening the terminal window.  Format:
		{rows}x{columns} or {rows}*{columns}.
	- When empty the terminal gets the size from the window.
	- When set with a "x" (e.g., "24x80") the terminal size is not
	  adjusted to the window size.  If the window is smaller only the
	  top-left part is displayed.
	- When set with a "*" (e.g., "10*50") the terminal size follows the
	  window size, but will not be smaller than the specified rows and/or
	  columns.
	- When rows is zero then use the height of the window.
	- When columns is zero then use the width of the window.
	- Using "0x0" or "0*0" is the same as empty.
	- Can be overruled in the term_start() options with "term_rows" and
	  "term_cols".

	Examples:
	  "30x0" uses 30 rows and the current window width.
	  "20*0" uses at least 20 rows and the current window width.
	  "0*40" uses the current window height and at least 40 columns.
	Note that the command running in the terminal window may still change
	the size of the terminal.  In that case the Vim window will be
	adjusted to that size, if possible.

						'termwintype' 'twt'
'termwintype' 'twt'	string  (default "")
			global
			{only available when compiled with the terminal
			feature on MS-Windows}
	Specify the virtual console (pty) used when opening the terminal
	window.

	Possible values are:
	    ""		use ConPTY if it is stable, winpty otherwise
	    "winpty"	use winpty, fail if not supported
	    "conpty"	use ConPTY, fail if not supported

	ConPTY support depends on the platform.  Windows 10 October 2018
	Update is the first version that supports ConPTY, however it is still
	considered unstable.  ConPTY might become stable in the next release
	of Windows 10.  winpty support needs to be installed.  If neither is
	supported then you cannot open a terminal window.

						'terse' 'noterse'
'terse'			boolean	(default off)
			global
	When set: Add 's' flag to 'shortmess' option (this makes the message
	for a search that hits the start or end of the file not being
	displayed).  When reset: Remove 's' flag from 'shortmess' option.  {Vi
	shortens a lot of messages}

				   'textauto' 'ta' 'notextauto' 'nota'
'textauto' 'ta'		boolean	(Vim default: on, Vi default: off)
			global
	This option is obsolete.  Use 'fileformats'.
	For backwards compatibility, when 'textauto' is set, 'fileformats' is
	set to the default value for the current system.  When 'textauto' is
	reset, 'fileformats' is made empty.
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

				   'textmode' 'tx' 'notextmode' 'notx'
'textmode' 'tx'		boolean	(Win32: default on,
				 others: default off)
			local to buffer
	This option is obsolete.  Use 'fileformat'.
	For backwards compatibility, when 'textmode' is set, 'fileformat' is
	set to "dos".  When 'textmode' is reset, 'fileformat' is set to
	"unix".

						'textwidth' 'tw'
'textwidth' 'tw'	number	(default 0)
			local to buffer
	Maximum width of text that is being inserted.  A longer line will be
	broken after white space to get this width.  A zero value disables
	this.
	'textwidth' is set to 0 when the 'paste' option is set and restored
	when 'paste' is reset.
	When 'textwidth' is zero, 'wrapmargin' may be used.  See also
	'formatoptions' and ins-textwidth.
	When 'formatexpr' is set it will be used to break the line.
	NOTE: This option is set to 0 when 'compatible' is set.

						'thesaurus' 'tsr'
'thesaurus' 'tsr'	string	(default "")
			global or local to buffer global-local
	List of file names, separated by commas, that are used to lookup words
	for thesaurus completion commands i_CTRL-X_CTRL-T.  See
	compl-thesaurus.

	This option is not used if 'thesaurusfunc' is set, either for the
	buffer or globally.

	To include a comma in a file name precede it with a backslash.  Spaces
	after a comma are ignored, otherwise spaces are included in the file
	name.  See option-backslash about using backslashes.  The use of
	:set+= and :set-= is preferred when adding or removing directories
	from the list.  This avoids problems when a future version uses
	another default.  Backticks cannot be used in this option for security
	reasons.

						'thesaurusfunc' 'tsrfu'
'thesaurusfunc' 'tsrfu'	string	(default: empty)
			global or local to buffer global-local
			{not available when compiled without the +eval
			feature}
	This option specifies a function to be used for thesaurus completion
	with CTRL-X CTRL-T. i_CTRL-X_CTRL-T See compl-thesaurusfunc.
	The value can be the name of a function, a lambda or a Funcref.
	See option-value-function for more information.

	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

			     'tildeop' 'top' 'notildeop' 'notop'
'tildeop' 'top'		boolean	(default off)
			global
	When on: The tilde command "~" behaves like an operator.
	NOTE: This option is reset when 'compatible' is set.

				'timeout' 'to' 'notimeout' 'noto'
'timeout' 'to'		boolean (default on)
			global

						'ttimeout' 'nottimeout'
'ttimeout'		boolean (default off, set in defaults.vim)
			global
	These two options together determine the behavior when part of a
	mapped key sequence or keyboard code has been received:

	'timeout'    'ttimeout'		action	
	   off		off		do not time out
	   on		on or off	time out on :mappings and key codes
	   off		on		time out on key codes

	If both options are off, Vim will wait until either the complete
	mapping or key sequence has been received, or it is clear that there
	is no mapping or key sequence for the received characters.  For
	example: if you have mapped "vl" and Vim has received 'v', the next
	character is needed to see if the 'v' is followed by an 'l'.
	When one of the options is on, Vim will wait for about 1 second for
	the next character to arrive.  After that the already received
	characters are interpreted as single characters.  The waiting time can
	be changed with the 'timeoutlen' option.
	On slow terminals or very busy systems timing out may cause
	malfunctioning cursor keys.  If both options are off, Vim waits
	forever after an entered <Esc> if there are key codes that start
	with <Esc>.  You will have to type <Esc> twice.  If you do not have
	problems with key codes, but would like to have :mapped key
	sequences not timing out in 1 second, set the 'ttimeout' option and
	reset the 'timeout' option.

	NOTE: 'ttimeout' is reset when 'compatible' is set.

						'timeoutlen' 'tm'
'timeoutlen' 'tm'	number	(default 1000)
			global

						'ttimeoutlen' 'ttm'
'ttimeoutlen' 'ttm'	number	(default -1, set to 100 in defaults.vim)
			global
	The time in milliseconds that is waited for a key code or mapped key
	sequence to complete.  Also used for CTRL-\ CTRL-N and CTRL-\ CTRL-G
	when part of a command has been typed.
	Normally only 'timeoutlen' is used and 'ttimeoutlen' is -1.  When a
	different timeout value for key codes is desired set 'ttimeoutlen' to
	a non-negative number.

		ttimeoutlen	mapping delay	   key code delay	
		   < 0		'timeoutlen'	   'timeoutlen'
		  >= 0		'timeoutlen'	   'ttimeoutlen'

	The timeout only happens when the 'timeout' and 'ttimeout' options
	tell so.  A useful setting would be 
		:set timeout timeoutlen=3000 ttimeoutlen=100
	(time out on mapping after three seconds, time out on key codes after
	a tenth of a second).

						'title' 'notitle'
'title'			boolean	(default off, on when title can be restored)
			global
	When on, the title of the window will be set to the value of
	'titlestring' (if it is not empty), or to:
		filename [+=-] (path) - VIM
	Where:
		filename	the name of the file being edited
		-		indicates the file cannot be modified, 'ma' off
		+		indicates the file was modified
		=		indicates the file is read-only
		=+		indicates the file is read-only and modified
		(path)		is the path of the file being edited
		- VIM		the server name v:servername or "VIM"
	Only works if the terminal supports setting window titles
	(currently Amiga console, Win32 console, all GUI versions and
	terminals with a non-empty 't_ts' option - these are Unix xterm and
	iris-ansi by default, where 't_ts' is taken from the builtin termcap).
								X11
	When Vim was compiled with HAVE_X11 defined, the original title will
	be restored if possible.  The output of ":version" will include "+X11"
	when HAVE_X11 was defined, otherwise it will be "-X11".  This also
	works for the icon name 'icon'.
	But: When Vim was started with the -X argument, restoring the title
	will not work (except in the GUI).
	If the title cannot be restored, it is set to the value of 'titleold'.
	You might want to restore the title outside of Vim then.
	When using an xterm from a remote machine you can use this command: 

	    rsh machine_name xterm -display $DISPLAY &
	    ssh -X machine_name xterm &

	then the WINDOWID environment variable should be inherited and the
	title of the window should change back to what it should be after
	exiting Vim.

								'titlelen'
'titlelen'		number	(default 85)
			global
	Gives the percentage of 'columns' to use for the length of the window
	title.  When the title is longer, only the end of the path name is
	shown.  A '<' character before the path name is used to indicate this.
	Using a percentage makes this adapt to the width of the window.  But
	it won't work perfectly, because the actual number of characters
	available also depends on the font used and other things in the title
	bar.  When 'titlelen' is zero the full path is used.  Otherwise,
	values from 1 to 30000 percent can be used.
	'titlelen' is also used for the 'titlestring' option.

						'titleold'
'titleold'		string	(default "Thanks for flying Vim")
			global
	This option will be used for the window title when exiting Vim if the
	original title cannot be restored.  Only happens if 'title' is on or
	'titlestring' is not empty.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.
						'titlestring'
'titlestring'		string	(default "")
			global
	When this option is not empty, it will be used for the title of the
	window.  This happens only when the 'title' option is on.
	Only works if the terminal supports setting window titles (currently
	Amiga console, Win32 console, all GUI versions and terminals with a
	non-empty 't_ts' option).
	When Vim was compiled with HAVE_X11 defined, the original title will
	be restored if possible, see X11.

	When this option contains printf-style '%' items, they will be
	expanded according to the rules used for 'statusline'.
	This option cannot be set in a modeline when 'modelineexpr' is off.

	Example: 
    :auto BufEnter * let &titlestring = hostname() .. "/" .. expand("%:p")
    :set title titlestring=%<%F%=%l/%L-%P titlelen=70
	The value of 'titlelen' is used to align items in the middle or right
	of the available space.
	Some people prefer to have the file name first: 
    :set titlestring=%t%(\ %M%)%(\ (%{expand(\"%:~:.:h\")})%)%(\ %a%)
	Note the use of "%{ }" and an expression to get the path of the file,
	without the file name.  The "%( %)" constructs are used to add a
	separating space only when needed.
	NOTE: Use of special characters in 'titlestring' may cause the display
	to be garbled (e.g., when it contains a CR or NL character).
	{not available when compiled without the |+statusline| feature}

				'toolbar' 'tb'
'toolbar' 'tb'		string	(default "icons,tooltips")
			global
			{only for +GUI_GTK, +GUI_Motif, +GUI_Photon and
			gui_macvim}
	The contents of this option controls various toolbar settings.  The
	possible values are:
		icons		Toolbar buttons are shown with icons.
		text		Toolbar buttons shown with text.
		horiz		Icon and text of a toolbar button are
				horizontally arranged.  {only in GTK+ 2 GUI}
		tooltips	Tooltips are active for toolbar buttons.
	Tooltips refer to the popup help text which appears after the mouse
	cursor is placed over a toolbar button for a brief moment.
	Note: Tooltips are always enabled in MacVim.

	If you want the toolbar to be shown with icons as well as text, do the
	following: 
		:set tb=icons,text
	Motif cannot display icons and text at the same time.  They
	will show icons if both are requested.

	If none of the strings specified in 'toolbar' are valid or if
	'toolbar' is empty, this option is ignored.  If you want to disable
	the toolbar, you need to set the 'guioptions' option.  For example: 
		:set guioptions-=T
	Also see gui-toolbar.

						'toolbariconsize' 'tbis'
'toolbariconsize' 'tbis'	string	(default "small")
				global
				{only in the GTK+ and MacVim GUIs}
	Controls the size of toolbar icons.  The possible values are:
		tiny		Use tiny icons.
		small		Use small icons (default).
		medium		Use medium-sized icons.
		large		Use large icons.
		huge		Use even larger icons.
		giant		Use very big icons.
	The exact dimensions in pixels of the various icon sizes depend on
	the current theme.  Common dimensions are giant=48x48, huge=32x32,
	large=24x24, medium=24x24, small=20x20 and tiny=16x16.  In MacVim, both
	tiny and small equal 24x24, whereas medium and large equal 32x32.

	If 'toolbariconsize' is empty, the global default size as determined
	by user preferences or the current theme is used.

						'transparency' 'transp'
'transparency' 'transp'	number  (default 0)
			global
			{not in Vi}
			{only in MacVim GUI}
	Transparency of the window background as a percent, with 0 meaning
	opaque and 100 meaning completely transparent.  Trying to set a value
	outside the range 0-100 results in an error.

			     'ttybuiltin' 'tbi' 'nottybuiltin' 'notbi'
'ttybuiltin' 'tbi'	boolean	(default on)
			global
	When on, the builtin termcaps are searched before the external ones.
	When off the builtin termcaps are searched after the external ones.
	When this option is changed, you should set the 'term' option next for
	the change to take effect, for example: 
		:set notbi term=$TERM
	See also termcap.
	Rationale: The default for this option is "on", because the builtin
	termcap entries are generally better (many systems contain faulty
	xterm entries...).

				     'ttyfast' 'tf' 'nottyfast' 'notf'
'ttyfast' 'tf'		boolean	(default on)
			global
	Indicates a fast terminal connection.  More characters will be sent to
	the screen for redrawing, instead of using insert/delete line
	commands.  Improves smoothness of redrawing when there are multiple
	windows and the terminal does not support a scrolling region.
	Also enables the extra writing of characters at the end of each screen
	line for lines that wrap.  This helps when using copy/paste with the
	mouse in an xterm and other terminals.

	The default used to be set only for some terminal names, but these
	days nearly all terminals are fast, therefore the default is now "on".
	If you have a slow connection you may want to set this option off,
	e.g. depending on the host name: 
		if hostname() =~ 'faraway'
		   set nottyfast
		endif

						'ttymouse' 'ttym'
'ttymouse' 'ttym'	string	(default depends on 'term')
			global
			{only in Unix and VMS, doesn't work in the GUI; not
			available when compiled without +mouse}
	Name of the terminal type for which mouse codes are to be recognized.
	Currently these strings are valid:
							xterm-mouse
	   xterm	xterm-like mouse handling.  The mouse generates
			"<Esc>[Mscr", where "scr" is three bytes:
				"s"  = button state
				"c"  = column plus 33
				"r"  = row plus 33
			This only works up to 223 columns!  See "dec",
			"urxvt", and "sgr" for solutions.
	   xterm2	Works like "xterm", but with the xterm reporting the
			mouse position while the mouse is dragged.  This works
			much faster and more precise.  Your xterm must at
			least at patchlevel 88 / XFree 3.3.3 for this to
			work.  See below for how Vim detects this
			automatically.
							netterm-mouse
	   netterm	NetTerm mouse handling.  A left mouse click generates
			"<Esc>}r,c<CR>", where "r,c" are two decimal numbers
			for the row and column.  No other mouse events are
			supported.
							dec-mouse
	   dec		DEC terminal mouse handling.  The mouse generates a
			rather complex sequence, starting with "<Esc>[".
			This is also available for an Xterm, if it was
			configured with "--enable-dec-locator".
							jsbterm-mouse
	   jsbterm	JSB term mouse handling.
							pterm-mouse
	   pterm	QNX pterm mouse handling.
							urxvt-mouse
	   urxvt	Mouse handling for the urxvt (rxvt-unicode) terminal.
			The mouse works only if the terminal supports this
			encoding style, but it does not have 223 columns limit
			unlike "xterm" or "xterm2".
							sgr-mouse
	   sgr		Mouse handling for the terminal that emits SGR-styled
			mouse reporting.  The mouse works even in columns
			beyond 223.  This option is backward compatible with
			"xterm2" because it can also decode "xterm2" style
			mouse codes.

	The mouse handling must be enabled at compile time +mouse_xterm
	+mouse_dec +mouse_netterm +mouse_jsbterm +mouse_urxvt
	+mouse_sgr.
	Only "xterm"(2) is really recognized.  NetTerm mouse codes are always
	recognized, if enabled at compile time.  DEC terminal mouse codes
	are recognized if enabled at compile time, and 'ttymouse' is not
	"xterm", "xterm2", "urxvt" or "sgr" (because dec mouse codes conflict
	with them).
	This option is automatically set to "xterm", when the 'term' option is
	set to a name that starts with "xterm", "mlterm", "screen", "tmux",
	"st" (full match only), "st-" or "stterm", and 'ttymouse' is not set
	already.
	If the terminfo/termcap entry "XM" exists and the first number is
	"1006" then 'ttymouse' will be set to "sgr".  This works for many
	modern terminals.
	Additionally, if vim is compiled with the +termresponse feature and
	t_RV is set to the escape sequence to request the xterm version
	number, more intelligent detection is done.
	The "xterm2" value will be set if the xterm version is reported to be
	from 95 to 276.  The "sgr" value will be set if Vim detects Mac
	Terminal.app, iTerm2 or mintty, and when the xterm version is 277 or
	higher.
	If you do not want 'ttymouse' to be set to "xterm2" or "sgr"
	automatically, set t_RV to an empty string: 
		:set t_RV=

						'ttyscroll' 'tsl'
'ttyscroll' 'tsl'	number	(default 999)
			global
	Maximum number of lines to scroll the screen.  If there are more lines
	to scroll the window is redrawn.  For terminals where scrolling is
	very slow and redrawing is not slow this can be set to a small number,
	e.g., 3, to speed up displaying.

						'ttytype' 'tty'
'ttytype' 'tty'		string	(default from $TERM)
			global
	Alias for 'term', see above.

						'undodir' 'udir'
'undodir' 'udir'	string	(default ".")
			global
			{only when compiled with the |+persistent_undo| feature}
	List of directory names for undo files, separated with commas.
	See 'backupdir' for details of the format.
	"." means using the directory of the file.  The undo file name for
	"file.txt" is ".file.txt.un~".
	For other directories the file name is the full path of the edited
	file, with path separators replaced with "%".
	When writing: The first directory that exists is used. "." always
	works, no directories after "." will be used for writing.
	When reading all entries are tried to find an undo file.  The first
	undo file that exists is used.  When it cannot be read an error is
	given, no further entry is used.
	See undo-persistence.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

				'undofile' 'noundofile' 'udf' 'noudf'
'undofile' 'udf'	boolean	(default off)
			local to buffer
			{only when compiled with the |+persistent_undo| feature}
	When on, Vim automatically saves undo history to an undo file when
	writing a buffer to a file, and restores undo history from the same
	file on buffer read.
	The directory where the undo file is stored is specified by 'undodir'.
	For more information about this feature see undo-persistence.
	The undo file is not read when 'undoreload' causes the buffer from
	before a reload to be saved for undo.
	When 'undofile' is turned off the undo file is NOT deleted.
	NOTE: This option is reset when 'compatible' is set.

						'undolevels' 'ul'
'undolevels' 'ul'	number	(default 100, 1000 for Unix, VMS and Win32)
			global or local to buffer global-local
	Maximum number of changes that can be undone.  Since undo information
	is kept in memory, higher numbers will cause more memory to be used.
	Nevertheless, a single change can already use a large amount of memory.
	Set to 0 for Vi compatibility: One level of undo and "u" undoes
	itself: 
		set ul=0
	But you can also get Vi compatibility by including the 'u' flag in
	'cpoptions', and still be able to use CTRL-R to repeat undo.
	Also see undo-two-ways.
	Set to -1 for no undo at all.  You might want to do this only for the
	current buffer: 
		setlocal ul=-1
	This helps when you run out of memory for a single change.

	The local value is set to -123456 when the global value is to be used.

	Also see clear-undo.

						'undoreload' 'ur'
'undoreload' 'ur'	number	(default 10000)
			global
	Save the whole buffer for undo when reloading it.  This applies to the
	":e!" command and reloading for when the buffer changed outside of
	Vim. FileChangedShell
	The save only happens when this option is negative or when the number
	of lines is smaller than the value of this option.
	Set this option to zero to disable undo for a reload.

	When saving undo for a reload, any undo file is not read.

	Note that this causes the whole buffer to be stored in memory.  Set
	this option to a lower value if you run out of memory.

						'updatecount' 'uc'
'updatecount' 'uc'	number	(default: 200)
			global
	After typing this many characters the swap file will be written to
	disk.  When zero, no swap file will be created at all (see chapter on
	recovery crash-recovery).  'updatecount' is set to zero by starting
	Vim with the "-n" option, see startup.  When editing in readonly
	mode this option will be initialized to 10000.
	The swapfile can be disabled per buffer with 'swapfile'.
	When 'updatecount' is set from zero to non-zero, swap files are
	created for all buffers that have 'swapfile' set.  When 'updatecount'
	is set to zero, existing swap files are not deleted.
	Also see 'swapsync'.
	This option has no meaning in buffers where 'buftype' is "nofile"
	or "nowrite".

						'updatetime' 'ut'
'updatetime' 'ut'	number	(default 4000)
			global
	If this many milliseconds nothing is typed the swap file will be
	written to disk (see crash-recovery).  Also used for the
	CursorHold autocommand event.

					'varsofttabstop' 'vsts'
'varsofttabstop' 'vsts'	string	(default "")
			local to buffer
			{only available when compiled with the +vartabs
			feature}
	A list of the number of spaces that a <Tab> counts for while editing,
	such as inserting a <Tab> or using <BS>.  It "feels" like variable-
	width <Tab>s are being inserted, while in fact a mixture of spaces
	and <Tab>s is used.  Tab widths are separated with commas, with the
	final value applying to all subsequent tabs.

	For example, when editing assembly language files where statements
	start in the 9th column and comments in the 41st, it may be useful
	to use the following: 
		:set varsofttabstop=8,32,8
	This will set soft tabstops with 8 and 8 + 32 spaces, and 8 more
	for every column thereafter.

	Note that the value of 'softtabstop' will be ignored while
	'varsofttabstop' is set.

						'vartabstop' 'vts'
'vartabstop' 'vts'	string	(default "")
			local to buffer
			{only available when compiled with the +vartabs
			feature}
	A list of the number of spaces that a <Tab> in the file counts for,
	separated by commas.  Each value corresponds to one tab, with the
	final value applying to all subsequent tabs. For example: 
		:set vartabstop=4,20,10,8
	This will make the first tab 4 spaces wide, the second 20 spaces,
	the third 10 spaces, and all following tabs 8 spaces.

	Note that the value of 'tabstop' will be ignored while 'vartabstop'
	is set.

						'verbose' 'vbs'
'verbose' 'vbs'		number	(default 0)
			global
	When bigger than zero, Vim will give messages about what it is doing.
	Currently, these messages are given:
	>= 1	When the viminfo file is read or written.
	>= 2	When a file is ":source"'ed.
	>= 4	Shell commands.
	>= 5	Every searched tags file and include file.
	>= 8	Files for which a group of autocommands is executed.
	>= 9	Every executed autocommand.
	>= 11	Finding items in a path
	>= 12	Every executed function.
	>= 13	When an exception is thrown, caught, finished, or discarded.
	>= 14	Anything pending in a ":finally" clause.
	>= 15	Every executed Ex command from a script (truncated at 200
		characters).
	>= 16	Every executed Ex command.

	This option can also be set with the "-V" argument.  See -V.
	This option is also set by the :verbose command.

	When the 'verbosefile' option is set then the verbose messages are not
	displayed.

						'verbosefile' 'vfile'
'verbosefile' 'vfile'	string	(default empty)
			global
	When not empty all messages are written in a file with this name.
	When the file exists messages are appended.
	Writing to the file ends when Vim exits or when 'verbosefile' is made
	empty.  Writes are buffered, thus may not show up for some time.
	Setting 'verbosefile' to a new value is like making it empty first.
	The difference with :redir is that verbose messages are not
	displayed when 'verbosefile' is set.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'viewdir' 'vdir'
'viewdir' 'vdir'	string	(default for Amiga: "home:vimfiles/view",
					 for Win32: "$HOME/vimfiles/view",
					 for Unix: "$HOME/.vim/view",
					 for macOS: "$VIM/vimfiles/view",
					 for VMS: "sys$login:vimfiles/view")
			global
			{not available when compiled without the +mksession
			feature}
	Name of the directory where to store files for :mkview.
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

						'viewoptions' 'vop'
'viewoptions' 'vop'	string	(default: "folds,options,cursor,curdir")
			global
			{not available when compiled without the +mksession
			feature}
	Changes the effect of the :mkview command.  It is a comma-separated
	list of words.  Each word enables saving and restoring something:
	   word		save and restore 
	   cursor	cursor position in file and in window
	   folds	manually created folds, opened/closed folds and local
			fold options
	   options	options and mappings local to a window or buffer (not
			global values for local options)
	   localoptions same as "options"
	   slash	backslashes in file names replaced with forward
			slashes
	   unix		with Unix end-of-line format (single <NL>), even when
			on MS-Windows
	   curdir	the window-local directory, if set with :lcd

	"slash" and "unix" are useful on MS-Windows when sharing view files
	with Unix.  The Unix version of Vim cannot source dos format scripts,
	but the MS-Windows version of Vim can source unix format scripts.

				'viminfo' 'vi' E526 E527 E528
'viminfo' 'vi'		string	(Vi default: "", Vim default for
				   MS-Windows: '100,<50,s10,h,rA:,rB:,
				   for Amiga: '100,<50,s10,h,rdf0:,rdf1:,rdf2:
				   for others: '100,<50,s10,h)
			global
			{not available when compiled without the +viminfo
			feature}
	When non-empty, the viminfo file is read upon startup and written
	when exiting Vim (see viminfo-file). Except when 'viminfofile' is
	"NONE".
	The string should be a comma-separated list of parameters, each
	consisting of a single character identifying the particular parameter,
	followed by a number or string which specifies the value of that
	parameter.  If a particular character is left out, then the default
	value is used for that parameter.  The following is a list of the
	identifying characters and the effect of their value.
	CHAR	VALUE	
							viminfo-!
	!	When included, save and restore global variables that start
		with an uppercase letter, and don't contain a lowercase
		letter.  Thus "KEEPTHIS and "K_L_M" are stored, but "KeepThis"
		and "_K_L_M" are not.  Nested List and Dict items may not be
		read back correctly, you end up with an empty item.
							viminfo-quote
	"	Maximum number of lines saved for each register.  Old name of
		the '<' item, with the disadvantage that you need to put a
		backslash before the ", otherwise it will be recognized as the
		start of a comment!
							viminfo-%
	%	When included, save and restore the buffer list.  If Vim is
		started with a file name argument, the buffer list is not
		restored.  If Vim is started without a file name argument, the
		buffer list is restored from the viminfo file.  Quickfix
		('buftype'), unlisted ('buflisted'), unnamed and buffers on
		removable media (viminfo-r) are not saved.
		When followed by a number, the number specifies the maximum
		number of buffers that are stored.  Without a number all
		buffers are stored.
							viminfo-'
	'	Maximum number of previously edited files for which the marks
		are remembered.  This parameter must always be included when
		'viminfo' is non-empty.
		Including this item also means that the jumplist and the
		changelist are stored in the viminfo file.
							viminfo-/
	/	Maximum number of items in the search pattern history to be
		saved.  If non-zero, then the previous search and substitute
		patterns are also saved.  When not included, the value of
		'history' is used.
							viminfo-:
	:	Maximum number of items in the command-line history to be
		saved.  When not included, the value of 'history' is used.
							viminfo-<
	<	Maximum number of lines saved for each register.  If zero then
		registers are not saved.  When not included, all lines are
		saved.  '"' is the old name for this item.
		Also see the 's' item below: limit specified in Kbyte.
							viminfo-@
	@	Maximum number of items in the input-line history to be
		saved.  When not included, the value of 'history' is used.
							viminfo-c
	c	When included, convert the text in the viminfo file from the
		'encoding' used when writing the file to the current
		'encoding'.  See viminfo-encoding.
							viminfo-f
	f	Whether file marks need to be stored.  If zero, file marks ('0
		to '9, 'A to 'Z) are not stored.  When not present or when
		non-zero, they are all stored.  '0 is used for the current
		cursor position (when exiting or when doing ":wviminfo").
							viminfo-h
	h	Disable the effect of 'hlsearch' when loading the viminfo
		file.  When not included, it depends on whether ":nohlsearch"
		has been used since the last search command.
							viminfo-n
	n	Name of the viminfo file.  The name must immediately follow
		the 'n'.  Must be at the end of the option!  If the
		'viminfofile' option is set, that file name overrides the one
		given here with 'viminfo'.  Environment variables are
		expanded when opening the file, not when setting the option.
							viminfo-r
	r	Removable media.  The argument is a string (up to the next
		',').  This parameter can be given several times.  Each
		specifies the start of a path for which no marks will be
		stored.  This is to avoid removable media.  For MS-Windows you
		could use "ra:,rb:", for Amiga "rdf0:,rdf1:,rdf2:".  You can
		also use it for temp files, e.g., for Unix: "r/tmp".  Case is
		ignored.  Maximum length of each 'r' argument is 50
		characters.
							viminfo-s
	s	Maximum size of an item in Kbyte.  If zero then registers are
		not saved.  Currently only applies to registers.  The default
		"s10" will exclude registers with more than 10 Kbyte of text.
		Also see the '<' item above: line count limit.

	Example: 
	    :set viminfo='50,<1000,s100,:0,n~/vim/viminfo

	'50		Marks will be remembered for the last 50 files you
			edited.
	<1000		Contents of registers (up to 1000 lines each) will be
			remembered.
	s100		Registers with more than 100 Kbyte text are skipped.
	:0		Command-line history will not be saved.
	n~/vim/viminfo	The name of the file to use is "~/vim/viminfo".
	no /		Since '/' is not specified, the default will be used,
			that is, save all of the search history, and also the
			previous search and substitute patterns.
	no %		The buffer list will not be saved nor read back.
	no h		'hlsearch' highlighting will be restored.

	When setting 'viminfo' from an empty value you can use :rviminfo to
	load the contents of the file, this is not done automatically.

	This option cannot be set from a modeline or in the sandbox, for
	security reasons.
	NOTE: This option is set to the Vim default value when 'compatible'
	is reset.

				'viminfofile' 'vif'
'viminfofile' 'vif'	string	(default: "")
			global
			{not available when compiled without the +viminfo
			feature}
	When non-empty, overrides the file name used for viminfo.
	When equal to "NONE" no viminfo file will be read or written.
	This option can be set with the -i command line flag.  The --clean
	command line flag sets it to "NONE".
	This option cannot be set from a modeline or in the sandbox, for
	security reasons.

					    'virtualedit' 've'
'virtualedit' 've'	string	(default "")
			global or local to window global-local
	A comma-separated list of these words:
	    block	Allow virtual editing in Visual block mode.
	    insert	Allow virtual editing in Insert mode.
	    all		Allow virtual editing in all modes.
	    onemore	Allow the cursor to move just past the end of the line
	    none	When used as the local value, do not allow virtual
			editing even when the global value is set.  When used
			as the global value, "none" is the same as "".
	    NONE	Alternative spelling of "none".

	Virtual editing means that the cursor can be positioned where there is
	no actual character.  This can be halfway into a tab or beyond the end
	of the line.  Useful for selecting a rectangle in Visual mode and
	editing a table.
	"onemore" is not the same, it will only allow moving the cursor just
	after the last character of the line.  This makes some commands more
	consistent.  Previously the cursor was always past the end of the line
	if the line was empty.  But it is far from Vi compatible.  It may also
	break some plugins or Vim scripts.  For example because l can move
	the cursor after the last character.  Use with care!
	Using the $ command will move to the last character in the line, not
	past it.  This may actually move the cursor to the left!
	The g$ command will move to the end of the screen line.
	It doesn't make sense to combine "all" with "onemore", but you will
	not get a warning for it.
	When combined with other words, "none" is ignored.
	NOTE: This option is set to "" when 'compatible' is set.

			'visualbell' 'vb' 'novisualbell' 'novb' beep
'visualbell' 'vb'	boolean	(default off)
			global
	Use a visual bell instead of beeping.  The terminal code to display the
	visual bell is given with 't_vb'.  When no beep or flash is wanted,
	use: 
		:set vb t_vb=
	If you want a short flash, you can use this on many terminals: 
		:set vb t_vb=[?5h$<100>[?5l
	Here $<100> specifies the time, you can use a smaller or bigger value
	to get a shorter or longer flash.

	Note: Vim will limit the bell to once per half a second.  This avoids
	having to wait for the flashing to finish when there are lots of
	bells, e.g. on key repeat.  This also happens without 'visualbell'
	set.

	In the GUI, 't_vb' defaults to "<Esc>|f", which inverts the display
	for 20 msec.  If you want to use a different time, use "<Esc>|40f",
	where 40 is the time in msec.

	Note: When the GUI starts, 't_vb' is reset to its default value.  You
	might want to set it again in your gvimrc.

	Does not work on the Amiga, you always get a screen flash.
	Also see 'errorbells'.

						'warn' 'nowarn'
'warn'			boolean	(default on)
			global
	Give a warning message when a shell command is used while the buffer
	has been changed.

		     'weirdinvert' 'wiv' 'noweirdinvert' 'nowiv'
'weirdinvert' 'wiv'	boolean	(default off)
			global
	This option has the same effect as the 't_xs' terminal option.
	It is provided for backwards compatibility with version 4.x.
	Setting 'weirdinvert' has the effect of making 't_xs' non-empty, and
	vice versa.  Has no effect when the GUI is running.

						'whichwrap' 'ww'
'whichwrap' 'ww'	string	(Vim default: "b,s", Vi default: "")
			global
	Allow specified keys that move the cursor left/right to move to the
	previous/next line when the cursor is on the first/last character in
	the line.  Concatenate characters to allow this for these keys:
		char   key	  mode	
		 b    <BS>	 Normal and Visual
		 s    <Space>	 Normal and Visual
		 h    "h"	 Normal and Visual (not recommended)
		 l    "l"	 Normal and Visual (not recommended)
		 <    <Left>	 Normal and Visual
		 >    <Right>	 Normal and Visual
		 ~    "~"	 Normal
		 [    <Left>	 Insert and Replace
		 ]    <Right>	 Insert and Replace
	For example: 
		:set ww=<,>,[,]
	allows wrap only when cursor keys are used.
	When the movement keys are used in combination with a delete or change
	operator, the <EOL> also counts for a character.  This makes "3h"
	different from "3dh" when the cursor crosses the end of a line.  This
	is also true for "x" and "X", because they do the same as "dl" and
	"dh".  If you use this, you may also want to use the mapping
	":map <BS> X" to make backspace delete the character in front of the
	cursor.
	When 'l' is included and it is used after an operator at the end of a
	line (not an empty line) then it will not move to the next line.  This
	makes "dl", "cl", "yl" etc. work normally.
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

						'wildchar' 'wc'
'wildchar' 'wc'		number	(Vim default: <Tab>, Vi default: CTRL-E)
			global
	Character you have to type to start wildcard expansion in the
	command-line, as specified with 'wildmode'.
	More info here: cmdline-completion.
	The character is not recognized when used inside a macro.  See
	'wildcharm' for that.
	Some keys will not work, such as CTRL-C, <CR> and Enter.
	<Esc> can be used, but hitting it twice in a row will still exit
	command-line as a failsafe measure.
	Although 'wc' is a number option, you can set it to a special key: 
		:set wc=<Tab>
	NOTE: This option is set to the Vi default value when 'compatible' is
	set and to the Vim default value when 'compatible' is reset.

						'wildcharm' 'wcm'
'wildcharm' 'wcm'	number	(default: none (0))
			global
	'wildcharm' works exactly like 'wildchar', except that it is
	recognized when used inside a macro.  You can find "spare" command-line
	keys suitable for this option by looking at ex-edit-index.  Normally
	you'll never actually type 'wildcharm', just use it in mappings that
	automatically invoke completion mode, e.g.: 
		:set wcm=<C-Z>
		:cnoremap ss so $vim/sessions/*.vim<C-Z>
	Then after typing :ss you can use CTRL-P & CTRL-N.

						'wildignore' 'wig'
'wildignore' 'wig'	string	(default "")
			global
	A list of file patterns.  A file that matches with one of these
	patterns is ignored when expanding wildcards, completing file or
	directory names, and influences the result of expand(), glob() and
	globpath() unless a flag is passed to disable this.
	The pattern is used like with :autocmd, see autocmd-patterns.
	Also see 'suffixes'.
	Example: 
		:set wildignore=*.o,*.obj
	The use of :set+= and :set-= is preferred when adding or removing
	a pattern from the list.  This avoids problems when a future version
	uses another default.

		    'wildignorecase' 'wic' 'nowildignorecase' 'nowic'
'wildignorecase' 'wic'	boolean	(default off)
			global
	When set case is ignored when completing file names and directories.
	Has no effect when 'fileignorecase' is set.
	Does not apply when the shell is used to expand wildcards, which
	happens when there are special characters.

				'wildmenu' 'wmnu' 'nowildmenu' 'nowmnu'
'wildmenu' 'wmnu'	boolean	(default off, set in defaults.vim)
			global
	When 'wildmenu' is on, command-line completion operates in an enhanced
	mode.  On pressing 'wildchar' (usually <Tab>) to invoke completion,
	the possible matches are shown.
	When 'wildoptions' contains "pum", then the completion matches are
	shown in a popup menu.  Otherwise they are displayed just above the
	command line, with the first match highlighted (overwriting the status
	line, if there is one).
	Keys that show the previous/next match, such as <Tab> or
	CTRL-P/CTRL-N, cause the highlight to move to the appropriate match.
	When 'wildmode' is used, "wildmenu" mode is used where "full" is
	specified.  "longest" and "list" do not start "wildmenu" mode.
	You can check the current mode with wildmenumode().
	If there are more matches than can fit in the line, a ">" is shown on
	the right and/or a "<" is shown on the left.  The status line scrolls
	as needed.
	The "wildmenu" mode is abandoned when a key is hit that is not used
	for selecting a completion.
	While the "wildmenu" is active, the following keys have special
	meanings:
	CTRL-P		- go to the previous entry
	CTRL-N		- go to the next entry
	<CR>		- in menu completion, when the cursor is just after a
			  dot: move into a submenu.
	CTRL-E		- end completion, go back to what was there before
			  selecting a match.
	CTRL-Y		- accept the currently selected match and stop
			  completion.

	When not using the popup menu for command line completion, the
	following keys have special meanings:
	<Left> <Right>	- select previous/next match (like CTRL-P/CTRL-N)
	<Up>		- in filename/menu name completion: move up into
			  parent directory or parent menu.
	<Down>		- in filename/menu name completion: move into a
			  subdirectory or submenu.

	When using the popup menu for command line completion, the following
	keys have special meanings:
	<Up> <Down>	- select previous/next match (like CTRL-P/CTRL-N)
	<PageUp>	- select a match several entries back
	<PageDown>	- select a match several entries further
	<Left>		- in filename/menu name completion: move up into
			  parent directory or parent menu.
	<Right>		- in filename/menu name completion: move into a
			  subdirectory or submenu.

	This makes the menus accessible from the console console-menus.

	If you prefer the <Left> and <Right> keys to move the cursor instead
	of selecting a different match, use