= Commands

Some commands take an exclamation mark (*!*), which can be used to force
the execution of the command (i.e. to quit a modified buffer, the
command *q!* has to be used). Aliases are mentionned below each commands.

*doc* <topic>::
    *alias* help +
    display documentation about a topic. The completion list displays the
    available topics

== Files and Buffers

For the following *write* commands, the *-sync* switch forces the synchronization
of the file onto the filesystem

*change-directory* [<directory>]::
    *alias* cd +
    change the current directory to *directory*, or the home directory if
    unspecified

*edit[!]* [<switches>] <filename> [<line> [<column>]]::
    *alias* e +
    open buffer on file, go to given line and column. If file is already
    opened, just switch to this file. Use edit! to force reloading

    *-debug*:::
        The new buffer (if any) will be created as a debug buffer.
        (See <<buffers#debug-buffers,`:doc buffers debug-buffers`>>)

    *-existing*:::
        If the named file does not exist, fail instead of creating a new buffer.

    *-readonly*:::
        The new buffer (if any) will be set read-only.

    *-fifo* <fifoname>:::
        Creates a new scratch buffer named <filename>, and continually appends
        data from the fifo (named pipe) <fifoname> as it arrives.
        (See <<buffers#fifo-buffers,`:doc buffers fifo-buffers`>>)

    *-scratch*:::
        Creates a new buffer named <filename>, which doesn't correspond to any
        file on disk. If no filename is given, the buffer name will be
        generated based on format `\*scratch-$ID\*`, where `$ID` is an
        integer automatically incremented for new buffers.
        (See <<buffers#scratch-buffers,`:doc buffers scratch-buffers`>>)

    *-scroll*:::
        If used with `-fifo`, when new data arrives Kakoune will scroll the
        buffer down to make the new data visible.
        Otherwise, does nothing.


*write[!]* [-sync] [-atomic] [<filename>]::
    *alias* w +
    write buffer to <filename> or use its name if filename is not
    given. If the file is write-protected, its permissions are temporarily
    changed to allow saving the buffer and restored afterwards when
    the write! command is used.

    *-sync*:::
        Synchronise the filesystem after the write

    *-atomic*:::
        Force writing to a temporary file then renaming to the target file
        so that the modification appears automatically.

*write-all* [-sync]::
    *alias* wa +
    write all changed buffers that are associated to a file

*quit[!]* [<exit status>]::
    *alias* q +
    exit Kakoune, use quit! to force quitting even if there is some
    unsaved buffers remaining. If specified, the client exit status
    will be set to <exit status>

*write-quit[!]* [-sync] [<exit status>]::
    *alias* wq +
    write current buffer and quit current client. If specified, the client
    exit status will be set to <exit status>

*write-all-quit* [-sync] [<exit status>]::
    *alias* waq +
    write all buffers and quit. If specified, the client exit status
    will be set to <exit status>

*buffer* <name>::
    *alias* b +
    switch to buffer <name>

*buffer-next*::
    *alias* bn +
    switch to the next buffer.
    Debug buffers are skipped.
    (See <<buffers#debug-buffers,`:doc buffers debug-buffers`>>)

*buffer-prev*::
    *alias* bp +
    switch to the previous buffer.
    Debug buffers are skipped.
    (See <<buffers#debug-buffers,`:doc buffers debug-buffers`>>)

*delete-buffer[!]* [<name>]::
    *alias* db +
    delete current buffer or the buffer <name> if specified

*rename-buffer* [-file|-scratch] <name>::
    set current buffer name, if *-scratch* or *-file* is given, ensure
    the buffer is set to the corresponding type.

*source* <filename> <param>...::
    execute commands in <filename>
    parameters are available in the sourced script as `%arg{0}`, `%arg{1}`, …

== Clients and Sessions

*rename-client* <name>::
    *alias* nc +
    set current client name

*rename-session* <name>::
    set current session name

*kill[!]* [<exit status>]::
    terminate the current session, all the clients as well as the server.
    If specified, the server and clients exit status will be set to <exit status>

== Options

*declare-option* [<switches>] <type> <name> [<value>]::
    *alias* decl +
    declare a new option, the -hidden switch hides the option in completion
    suggestions (See <<options#declare-option,`:doc options declare-option`>>)

*set-option* [<switches>] <scope> <name> <value>::
    *alias* set +
    change the value of an option in *scope*
    (See <<options#set-option,`:doc options set-option`>>
    and <<scopes#,`:doc scopes`>>)

*unset-option* <scope> <name>::
    *alias* unset +
    unset the value of an option in *scope*, so the value from an outer scope
    is used
    (See <<options#unset-option,`:doc options unset-option`>>
    and <<scopes#,`:doc scopes`>>)

*update-option* <scope> <name>::
    update the value of an option if its type supports that operation
    (See <<options#update-option,`:doc options update-option`>>
    and <<scopes#,`:doc scopes`>>)

== Commands and Keys

*define-command* [<switches>] <name> <command>::
    *alias* def +
    define a new command (See <<declaring-new-commands,Declaring new commands>>)

*alias* <scope> <name> <command>::
    define a new alias named *name* in *scope*
    (See <<aliases,Using aliases>> and <<scopes#,`:doc scopes`>>)

*unalias* <scope> <name> [<command>]::
    remove an alias if its current value is the same as the one passed
    as an optional parameter, remove it unconditionally otherwise
    (See <<aliases,Using aliases>> and <<scopes#,`:doc scopes`>>)

*evaluate-commands* [<switches>] <command> ...::
    *alias* eval +
    evaluate commands, as if they were entered in the command prompt
    (See <<execeval#,`:doc execeval`>>)

*execute-keys* [<switches>] <key> ...::
    *alias* exec +
    execute a series of keys, as if they were hit (See <<execeval#,`:doc execeval`>>)

*map* [<switches>] <scope> <mode> <key> <keys>::
    bind a list of keys to a combination (See <<mapping#,`:doc mapping`>>
    and <<scopes#,`:doc scopes`>>)

*unmap* <scope> <mode> <key> [<expected>]::
    unbind a key combination (See <<mapping#,`:doc mapping`>>
    and <<scopes#,`:doc scopes`>>)

*declare-user-mode* <name>::
    declare a new user keymap mode

*enter-user-mode* [<switches>] <name>::
    enable <name> keymap mode for next key

    *-lock*:::
        stay in mode until `<esc>` is pressed

== Hooks

*hook* [-group <group>] <scope> <hook_name> <filtering_regex> <command>::
    execute *command* whenever an *hook_name* is triggered in *scope*
    (See <<hooks#,`:doc hooks`>> and <<scopes#,`:doc scopes`>>)

*remove-hooks* <scope> <group>::
    *alias* rmhooks +
    remove every hooks in *scope* that are part of the given *group*
    (See <<hooks#,`:doc hooks`>> and <<scopes#,`:doc scopes`>>)

== Display

*echo* [<switches>] <text>::
    show *text* in status line, with the following *switches*:

    *-markup*:::
        expand the markup strings in *text* (See
        <<faces#markup-strings,`:doc faces markup-strings`>>)

    *-debug*:::
        print the given text to the *\*debug** buffer

    *-to-file* <filename>:::
        write the given text to the given file on the host
        filesystem.

    *-quoting* <quoting>:::
        define how each arguments are quoted in echo output:

        - *raw* (default)::::
            just join each argument with a space

        - *kakoune*::::
            also wrap each argument in single quotes, doubling-up
            embedded quotes.

        - *shell*::::
            also wrap each arguments in single quotes and escape
            embedded quotes in a shell compatible way.

*set-face* <scope> <name> <facespec>::
    *alias* face +
    define a face in *scope*
    (See <<faces#,`:doc faces`>> and <<scopes#,`:doc scopes`>>)

*unset-face* <scope> <name>::
    Remove a face definition from *scope*
    (See <<faces#,`:doc faces`>> and <<scopes#,`:doc scopes`>>)

*colorscheme* <name>::
    load named colorscheme

*add-highlighter* <highlighter_name> <highlighter_parameters> ...::
    *alias* addhl +
    add a highlighter to the current window
    (See <<highlighters#,`:doc highlighters`>>)

*remove-highlighter* <highlighter_id>::
    *alias* rmhl +
    remove the highlighter whose id is *highlighter_id*
    (See <<highlighters#,`:doc highlighters`>>)

== Helpers

Kakoune provides some helper commands that can be used to define composite
commands in scripts. They are also available in the interactive mode,
but not really useful in that context.

*prompt* [<switches>] <prompt> <command>::
    prompt the user for a string, when the user validates, executes the
    command. The entered text is available in the `text` value accessible
    through `$kak_text` in shells or `%val{text}` in commands.

    The *-init <str>* switch allows setting initial content, the
    *-password* switch hides the entered text and clears the register
    after command execution.

    The *-on-change* and *-on-abort* switches, followed by a command
    will have this command executed whenever the prompt content changes
    or the prompt is aborted, respectively.

    Completion support can be controlled with the same switches provided
    by the *define-command* command, see
    <<declaring-new-commands,Declaring new commands>>.

    For *-shell-script-completions* and *-shell-script-candidates*
    completions, token_to_complete will always be 1, and the full
    prompt content will be passed as a single token. In other words,
    word splitting does not take place.

    NOTE: The prompt is displayed in and receives input from the
    current client context, so inside a draft context like
    `evaluate-commands -draft`, it is invisible and only responds to
    an `execute-keys` command in the same context.

*on-key* <command>::
    wait for next key from user, then execute <command>, the key is
    available through the `key` value, accessible through `$kak_key`
    in shells, or `%val{key}` in commands.

    NOTE: The key press must come from the current client context,
    so inside a draft context like `evaluate-commands -draft`, it only
    responds to an `execute-keys` command in the same context.

*menu* [<switches>] <label1> <commands1> <label2> <commands2> ...::
    display a menu using labels, the selected label’s commands are
    executed. The *menu* command can take an *-auto-single* argument, to automatically
    run commands when only one choice is provided, and a *-select-cmds*
    argument, in which case menu takes three argument per item, the
    last one being a command to execute when the item is selected (but
    not validated)

    NOTE: The menu is displayed in and receives input from the
    current client context, so inside a draft context like
    `evaluate-commands -draft`, it is invisible and only responds to
    an `execute-keys` command in the same context.

*info* [<switches>] <text>::
    display text in an information box with the following *switches*:

    *-anchor* <line>.<column>:::
        print the text at the given coordinates

    *-style* <style>:::
        set the style and placement of the message box.

        *menu*::::
            display the info next to the displayed menu, as documentation
            for the currently selected entry.

        *above*::::
            display the info above the given anchor

        *below*::::
            display the info below the given anchor

         *modal*::::
             display the info modally, and do not auto-close the
             info or replace it with non modal info boxes. To hide
             a modal info box, use `info -style modal` with no
             arguments.

    *-title* <text>:::
        set the title of the message box
        
    *-markup*:::
        parse markup in both title (if provided) and text. (See
        <<faces#markup-strings,`:doc faces markup-strings`>>)

    NOTE: The info box is displayed in the current client context,
    so inside a draft context like `eval -draft`, it is invisible.

*try* <commands> [catch <on_error_commands>]...::
    prevent an error in *commands* from aborting the whole command
    execution, execute *on_error_commands* instead. If nothing is to be
    done on error, the catch part can be omitted. If an error is raised
    in the *on_error_commands*, that error is propagated, except if
    another *catch* and *on_error_commands* parameter follows, in which
    case those commands get executed, and so-on. During error commands,
    the description of the last raised error is available as `$kak_error`
    in the shell, or `%val{error}` in commands.

*nop*::
    does nothing, but arguments will be evaluated (e.g. shell expansion)

*fail* <text>::
    raise an error, uses <text> as its description

*set-register* <name> <contents>...::
    *alias* reg +
    set register *name* to *content*, each content parameter is assigned to
    a different string in the register. (See <<registers#,`:doc registers`>>)

*select* [<switches>] <anchor_line>.<anchor_column>,<cursor_line>.<cursor_column>...::
    replace the current selections with the ones described in the arguments
    
    *-timestamp* <timestamp>:::
        specify which buffer timestamp those coordinates apply to. Uses current
        buffer timestamp if not specified.

    *-codepoint*::
        provided columns are to be interpreted as codepoint counts, not byte counts.

    *-display-column*::
        provided columns are to be interpreted as display column counts, not byte counts.

    both *-codepoint* and *-display-column* are only valid if *-timestamp*
    matches the current buffer timestamp (or is not specified).

*debug* {info,buffers,options,memory,shared-strings,profile-hash-maps,faces,mappings}::
    print some debug information in the *\*debug** buffer

== Module commands

*provide-module* [<switches>] <name> <commands>::
    declares a module *name* that is defined by *commands*. *commands* will be
    evaluated as if by source the first time *require-module <name>* is run.

*-override*:::
    allow the module to replace an existing one with the same name. Fails if
    the module has already been evaluated.

*require-module* <name>::
    guarantees the commands associated with *name* have been evaluated before
    continuing command execution. Fails if *name* has not been defined by a
    *provide-module* command. Does nothing if the associated commands have
    already been evaluated.

== Multiple commands

Commands (c.f. previous sections) can be chained, by being separated either
by new lines or by semicolons, as such a semicolon must be escaped with a
backslash (\;) to be considered as a literal semicolon argument.

To avoid trouble while writing `map` or `execute-keys` commands in scripts,
the alternative key namings `<semicolon>` and `<a-semicolon>` can be used.

== Declaring new commands

New commands can be defined using the *define-command* command:

*define-command* [<switches>] <command_name> <commands>::
    *commands* is a string containing the commands to execute, and *switches*
    can be any combination of the following parameters:

*-params* <num>:::
    the command accepts a *num* parameter, which can be either a number,
    or of the form <min>..<max>, with both <min> and <max> omittable

*-file-completion*:::
    try file completion on any parameter passed to this command

*-client-completion*:::
    try client name completion on any parameter passed to this command

*-buffer-completion*:::
    try buffer name completion on any parameter passed to this command

*-command-completion*:::
    try command completion on any parameter passed to this command

*-shell-completion*:::
    try shell command completion on any parameter passed to this command

*-shell-script-completion*:::
    following string is a shell command which takes parameters as
    positional params and output one completion candidate per line.
    The provided shell command will run after each keypress

    during the executing of the shell command, the following env vars are
    available:

    - *kak_token_to_complete*::::
        Index of the token being completed in the command line.

    - *kak_pos_in_token*::::
        Position of the cursor inside the token being completed, in bytes
        from token start.

*-shell-script-candidates*:::
    following string is a shell command which takes parameters as
    positional params and output one completion candidate per line.
    The provided shell command will run once at the beginning of each
    completion session, candidates are cached and then used by kakoune
    internal fuzzy engine

    during the executing of the shell command, the following env vars are
    available:

    - *kak_token_to_complete*::::
        Index of the token being completed in the command line.

*-override*:::
    allow the new command to replace an existing one with the same name

*-hidden*:::
    do not show the command in command name completions

*-docstring*:::
    define the documentation string for the command

Using shell expansion allows defining complex commands or accessing
Kakoune's state:

--------------------------------------------------------
def " print_selection %{ echo %sh{ ${kak_selection} } }"
--------------------------------------------------------

== Aliases

With `:alias`, commands can be given additional names.
As aliases are intended to be used interactively most of the time,
they are often short. For example `:reg` is an alias for `:set-register`.

They are scoped, so that an alias can refer to one command for a buffer,
and to another for another buffer. For instance `:next` could be an alias
for `grep-next-match` in a `*grep*` buffer while pointing to
`:make-next-error` in a `*make*` buffer.

The following command defines `<alias>` as an alias for `<command>`:

--------------------------------
:alias <scope> <alias> <command>
--------------------------------

`<scope>` can be one of `global`, `buffer` or `window`.

-------------------------------------
:unalias <scope> <alias> [<expected>]
-------------------------------------

Will remove the given alias in the given scope. If `<expected>` is specified
the alias will only be removed if its current value is `<expected>`.

