kakoune/doc/pages/hooks.asciidoc

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= Hooks
== Description
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Commands can be registered to be executed when certain events arise. To
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register a hook use the following command:
------------------------------------------------------------------------------
hook [-group <group> | -once] <scope> <hook_name> <filtering_regex> <commands>
------------------------------------------------------------------------------
*scope* can be one of *global*, *buffer* or *window* (See
<<scopes#,`:doc scopes`>>).
*hook_name* must be one of the hook names in the list below, like `InsertKey`
or `BufSetOption`.
*filtering_regex* must match the entire parameter string in order for the
commands to be executed.
*command* is a string containing the commands to execute when the hook
is called.
If *group* is given, make this hook part of the named group. Groups are used
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for removing hooks with the following command:
----------------------------
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remove-hooks <scope> <group>
----------------------------
A call to the command above will remove every hook in *scope* whose group
matches the given *group* regex.
If `-once` is given, the hook is automatically removed after running.
For example to automatically use line numbering with .cc files, use the
following command:
--------------------------------------------------------------
hook global WinCreate .*\.cc %{ add-highlighter number-lines }
--------------------------------------------------------------
== Default hooks
The parameter string associated with each hook is described after the hook
name. Hooks with no description will always use an empty string.
*NormalIdle*::
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a certain duration has passed since last key was pressed in normal mode
*NormalBegin*::
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entering normal mode
*NormalEnd*::
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leaving normal mode
*NormalKey* `key`::
a key is received in normal mode
*InsertIdle*::
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a certain duration has passed since last key was pressed in insert mode
*InsertBegin*::
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entering insert mode
*InsertEnd*::
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leaving insert mode
*InsertKey* `key`::
a key is received in insert mode
*InsertChar* `char`::
a character is received in insert mode
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*InsertDelete* `deleted char`::
a character is deleted in insert mode
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*InsertMove* `move key`::
the cursor moved (without inserting) in insert mode
*PromptIdle*::
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a certain duration has passed since last key was pressed in prompt mode
*WinCreate* `buffer name`::
a window was created. This hook is executed in draft context, so any a
changes to selections or input state will be discarded.
*WinClose* `buffer name`::
a window was destroyed. This hook is executed in a draft context, so any
changes to selections or input state will be discarded.
*WinResize* `<line>.<column>`::
a window was resized. This hook is executed in a draft context, so any
changes to selections or input state will be discarded.
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*WinDisplay* `buffer name`::
a client switched to displaying the given buffer.
*WinSetOption* `<option_name>=<new_value>`::
an option was set in a window context. This hook is executed in a draft
acontext, so any changes to selections or input state will be discarded.
*GlobalSetOption* `<option_name>=<new_value>`::
an option was set at the global scope
*BufSetOption* `<option_name>=<new_value>`::
an option was set in a buffer context
*BufNewFile* `filename`::
a buffer for a new file has been created
*BufOpenFile* `filename`::
a buffer for an existing file has been created
*BufCreate* `filename`::
a buffer has been created
*BufWritePre* `filename`::
executed just before a buffer is written
*BufWritePost* `filename`::
executed just after a buffer is written
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*BufReload* `filename`::
executed after a buffer reload has been triggered by an external
modification to its file
*BufClose* `buffer name`::
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executed when a buffer is deleted, while it is still valid
*BufOpenFifo* `buffer name`::
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executed when a buffer opens a fifo
*BufReadFifo* `<start line>.<start column>,<end line>.<end column>`::
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executed after some data has been read from a fifo and inserted in
the buffer. The hook param contains the range of text that was just
inserted, in a format compatible with the `select` command.
*BufCloseFifo*::
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executed when a fifo buffer closes its fifo file descriptor either
because the buffer is being deleted or the writing end has been closed
*ClientCreate* `client name`::
executed when a new client is created.
*ClientClose* `client name`::
executed when a client is closed, after it was removed from the client
list.
*RuntimeError* `error message`::
an error was encountered while executing a user command
*ModeChange* `<old mode>:<new mode>`::
Triggered whenever the current input mode changes
*KakBegin* `session name`::
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kakoune has started, this hook is called just after reading the user
configuration files
*KakEnd*::
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kakoune is quitting
*FocusIn* `client name`::
on supported clients, triggered when the client gets focused
*FocusOut* `client name`::
on supported clients, triggered when the client gets unfocused
*InsertCompletionShow*::
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Triggered when the insert completion menu gets displayed
*InsertCompletionHide* `completion`::
Triggered when the insert completion menu gets hidden, the inserted
completion text is passed as filtering text.
*RawKey* `key`::
Triggered whenever a key is pressed by the user
Note that some hooks will not consider underlying scopes depending on what
context they are bound to be run into, e.g. the `BufWritePost` hook is a buffer
hook, and will not consider the `window` scope.
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While defining hook commands with a `%sh{}` block, some additional env
vars are available:
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* `kak_hook_param`: filtering text passed to the currently executing hook
* `kak_hook_param_capture_N`: text captured by the hook filter regex capturing
group N, N can either be the capturing group number, or its name
(See <<regex#groups,`:doc regex groups`>>).
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== Disabling Hooks
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Any normal mode command can be prefixed with `\ ` which will disable hook
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execution for the duration for the command (including the duration of modes
the command could move to, so `\i` will disable hooks for the whole insert
session).
As autoindentation is implemented in terms of hooks, this can be used to
disable it when pasting text.
A less temporary alternative is to set the `disabled_hooks` option which
accepts a regex describing which hooks won't be executed.
For example indentation hooks can be disabled with '.*-indent'.
Finally, hook execution can be disabled while using the `execute-keys` or
`evaluate-commands` commands by using the `-no-hooks` switch.
(See <<execeval#,`:doc execeval`>>)
As an exception to these rules, hooks declared with the `-always` switch
are triggered no matter what. A good use case is doing some cleanup on `BufCloseFifo`.