= Options

== Description

Kakoune can store named and typed values that can be used both to customize
the core editor behaviour, and to store data used by extension scripts.

Options can be modified using the *set-option* command:

---------------------------------
set-option <scope> <name> <value>
---------------------------------

<scope> can be *global*, *buffer* or *window* (See <<scopes#,`:doc scopes`>>)

New options can be declared using the *declare-option* command:

------------------------------------------------
declare-option [-hidden] <type> <name> [<value>]
------------------------------------------------

If `-hidden` is specified, the option will not be displayed in completion
suggestions.

== Types

All options have a type, which defines how they are translated to/from text
and their set of valid values.

Some types are usable for user defined options while some other types
are exclusively available to built-in options.

*int*::
	an integer number
*bool*::
	a boolean value, yes/true or no/false
*str*::
	a string, some freeform text
*regex*::
	as a string but the set commands will complain if the entered text
	is not a valid regex
*coord*::
	a line, column pair (separated by comma)
*<type>-list*::
	a list, elements are separated by a colon (:) if an element needs
	to contain a colon, it can be escaped with a backslash
*range-specs*::
	a `:` separated list of a pair of a buffer range (`<begin
	line>.<begin column>,<end line>.<end column>` or `<begin
	line>.<begin column>+<length>`) and a string (separated by `|`),
	except for the first element which is just the timestamp of
	the buffer.  When the `update-option` is used on an option of
	this type, its ranges gets updated according to all the buffer
	modifications that happened since its timestamp.
*line-specs*::
	a `:` separated list of a line number and a corresponding flag
	(`<line>|<flag text>`), except for the first element which is
	just the timestamp of the buffer. When the `update-option` is
	used on an option of this type, its lines gets updated according
	to all the buffer modifications that happened since its timestamp.
*completions*::
	a `:` separated list of `<text>|<docstring>|<menu text>`
	candidates, except for the first element which follows the
	`<line>.<column>[+<length>]@<timestamp>` format to define where the
	completion apply in the buffer. Markup can be used in the menu text.
*enum(value1|value2|...)*::
	an enum, taking one of the given values
*flags(value1|value2|...)*::
	a set of flags, taking a combination of the given values joined by a
	'|' character

== Builtin options

*tabstop* 'int'::
	*default* 8 +
	width of a tab character

*indentwidth* 'int'::
	*default* 4 +
	width (in spaces) used for indentation, 0 means a tab character

*scrolloff* 'coord'::
	*default* 0,0 +
	number of lines, columns to keep visible around the cursor when
	scrolling

*eolformat* 'enum(lf|crlf)'::
	*default* lf +
	the format of end of lines when writing a buffer, this is autodetected
	on load; values of this option assigned to the `window` scope are
	ignored

*BOM* 'enum(none|utf8)'::
	*default* none +
	define if the file should be written with a unicode byte order mark;
	values of this option assigned to the `window` scope are ignored

*readonly* 'bool'::
	*default* false +
	prevent modifications from being saved to disk, all buffers if set
	to `true` in the `global` scope, or current buffer if set in the
	`buffer` scope; values of this option assigned to the `window`
	scope are ignored

*incsearch* 'bool'::
	*default* true +
	execute search as it is typed

*aligntab* 'bool'::
	*default* false +
	use tabs for alignment command

*autoinfo* 'flags(command|onkey|normal)'::
	*default* command|onkey +
	display automatic information box in the enabled contexts

*autoshowcompl* 'bool'::
	*default* true +
	automatically display possible completions when editing a prompt

*ignored_files* 'regex'::
	filenames matching this regex won't be considered as candidates on
	filename completion (except if the text being completed already
	matches it)

*disabled_hooks* 'regex'::
	hooks whose group matches this regex won't be executed. For example
	indentation hooks can be disabled with '.*-indent'

*filetype* 'str'::
	arbitrary string defining the type of the file filetype dependant
	actions should hook on this option changing for activation/deactivation

*path* 'str-list'::
	*default* ./:/usr/include +
	directories to search for gf command

*completers* 'completer-list'::
	*default* filename:word=all +
	completion engines to use for insert mode completion (they are tried
	in order until one generates candidates). Existing completers are:

	*word=all*, *word=buffer*:::
		which complete using words in all buffers (*word=all*)
		or only the current one (*word=buffer*)

	*filename*:::
		which tries to detect when a filename is being entered and
		provides completion based on local filesystem

	*line*:::
		which complete using lines in current buffer

	*option=<opt-name>*:::
		where *opt-name* is an option of type 'completions' whose
		contents will be used

*static_words* 'str-list'::
	list of words that are always added to completion candidates
	when completing words in insert mode

*extra_word_chars* 'codepoint-list'::
	a list of all additional codepoints that should be considered
	as word character for the purpose of insert mode completion.

*autoreload* 'enum(yes|no|ask)'::
	*default* ask +
	auto reload the buffers when an external modification is detected

*debug* 'flags(hooks|shell|profile|keys|commands)'::
	dump various debug information in the '\*debug*' buffer

*idle_timeout* 'int'::
	*default* 50 +
	timeout, in milliseconds, with no user input that will trigger the
	*PromptIdle*, *InsertIdle* and *NormalIdle* hooks, and autocompletion.

*fs_checkout_timeout* 'int'::
	*default* 500 +
	timeout, in milliseconds, between checks in normal mode of modifications
	of the file associated with the current buffer on the filesystem.

*modelinefmt* 'string'::
	A format string used to generate the mode line, that string is first
	expanded as a command line would be (expanding '%...{...}' strings),
	then markup tags are applied (c.f. the 'Expansions' documentation page.)
	Two special atoms are available as markup:

		*`{{mode_info}}`*:::
			Information about the current mode, such as `insert 3 sel` or
			`prompt`. The faces used are StatusLineMode, StatusLineInfo,
			and StatusLineValue.

		*`{{context_info}}`*:::
			Information such as `[+][recording (@)][no-hooks][new file][fifo]`,
			in face Information.

	The default value is '%val{bufname} %val{cursor_line}:%val{cursor_char_column} {{context_info}} {{mode_info}} - %val{client}@[%val{session}]'

*ui_options* 'str-to-str-map'::
	colon separated list of key=value pairs that are forwarded to the user
	interface implementation. The NCurses UI support the following options:

		*ncurses_set_title*:::
			if *yes* or *true*, the terminal emulator title will
			be changed

		*ncurses_status_on_top*:::
			if *yes*, or *true* the status line will be placed
			at the top of the terminal rather than at the bottom

		*ncurses_assistant*:::
			specify the nice assistant you get in info boxes,
			can be *clippy* (the default), *cat*, *dilbert* or *none*

		*ncurses_enable_mouse*:::
			boolean option that enables mouse support

		*ncurses_change_colors*:::
			boolean option that can disable color palette changing if the
			terminfo enables it but the terminal does not support it.

		*ncurses_wheel_down_button*, *ncurses_wheel_up_button*:::
			specify which button send for wheel down/up events
