kakoune/README.asciidoc

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Kakoune
=======
Introduction:
-------------
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Kakoune is a code editor heavily inspired by vim, as such most of it's
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commands are similar to vi's ones.
Kakoune can operate in two modes, normal and insertion. In insertion mode,
keys are directly inserted into the current buffer. In normal mode, keys
are used to manipulate the current selection and to enter insertion mode.
There is no concept of cursor in kakoune, only selections, a single character
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selection can be seen as a cursor but there is no difference internally.
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Building
--------
Kakoune dependencies are:
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* GCC >= 4.7
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* boost
* ncurses
To build, just type *make* in the src directory
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To setup a basic configuration on your account, type *make userconfig* in the
src directory, this will setup an initial $XDG_CONFIG_HOME/kak directory. See
the _Kakrc_ section for more information.
Running
-------
Just running *kak* launch a new kak session with a client on local terminal.
*kak* accepts some switches:
* +-c <session>+: connect to given session (which is the pid of the
initial kak process), sessions are unix sockets +/tmp/kak-<session>+
* +-e <commands>+: execute commands on startup
* +-n+: ignore kakrc file
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Basic Movement
--------------
* _space_: select the character under selection end
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* _alt-space_: flip the selections
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* _h_: select the character on the right of selection end
* _j_: select the character below the selection end
* _k_: select the character above the selection end
* _l_: select the character on the left of selection end
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* _w_: select the word and following whitespaces on the right of selection end
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* _b_: select preceding whitespaces and the word on the left of selection end
* _e_: select preceding whitespaces and the word on the right of selection end
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* _alt-[wbe]_: same as [wbe] but select WORD instead of word
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* _x_: select line on which selection end lies (or next line when end lies on
an end-of-line)
* _alt-x_: expand selections to contain full lines (including end-of-lines)
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* _alt-X_: trim selections to only contain full lines (not including last
end-of-line)
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* _%_: select whole buffer
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* _alt-H_: select to line begin
* _alt-L_: select to line end
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* _/_: search (select next match)
* _?_: search (extend to next match)
* _n_: select next match
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* _N_: add a new selection with next match
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* _alt-n_: replace main selection with next match (preserving the others)
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* _alt-c_: center main selection in current window
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* _pageup_: scroll up
* _pagedown_: scroll down
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Appending
---------
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for most selection commands, using shift permits to extend current selection
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instead of replacing it. for example, _wWW_ selects 3 consecutive words
Using Counts
------------
Most selection commands also support counts, which are entered before the
command itself.
for example, _3W_ selects 3 consecutive words and _3w_ select the third word on
the right of selection end.
* _space_: when used with count, keep only the counth selection
* _alt-space_: when used with count, remove the counth selection
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Changes
-------
* _i_: insert before current selection
* _a_: insert after current selection
* _d_: yank and delete current selection
* _c_: yank and delete current selection and insert
* _I_: insert at current selection begin line start
* _A_: insert at current selection end line end
* _o_: insert in a new line below current selection end
* _O_: insert in a new line above current selection begin
* _p_: paste after current selection end
* _P_: paste before current selection begin
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* _alt-p_: replace current selection with yanked text
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* _alt-j_: join selected lines
* _alt-J_: join selected lines and select spaces inserted
in place of line breaks
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* _>_: indent selected lines
* _<_: deindent selected lines
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* _|_: pipe each selections through the given external filter program
and replace with it's output.
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* _u_: undo last change
* _U_: redo last change
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* _r_: replace each character with the next entered one
* _&_: align selection, align the last character of selections by
inserting spaces before
* _`_: to lower case
* _~_: to upper case
* _alt-`_: swap case
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Goto Commands
-------------
Commands begining with g are used to goto certain position and or buffer:
* _gh_: select to line begin
* _gl_: select to line end
* _gg_, _gk_: go to the first line
* _gj_: go to the last line
* _gt_, _gk_: go to the first displayed line
* _gc_, _gk_: go to the middle displayed line
* _gb_: go to the last displayed line
* _ga_: go to the previous (alternate) buffer
* _gf_: open the file whose name is selected
View commands
-------------
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Some commands, all begining with v permit to manipulate the current
view.
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* _vv_ or _vc_: center the main selection in the window
* _vt_: scroll to put the main selection on the top line of the window
* _vb_: scroll to put the main selection on the bottom line of the window
* _vj_: scroll the window count line downward
* _vk_: scroll the window count line upward
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Multi Selection
---------------
Kak was designed from the start to handle multiple selections.
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One way to get a multiselection is via the _s_ key.
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For example, to change all occurences of word 'roger' to word 'marcel'
in a paragraph, here is what can be done:
select the paragraph with enough _x_. press _s_ and enter roger then enter.
now paragraph selection was replaced with multiselection of each roger in
the paragraph. press _c_ and marcel<esc> to replace rogers with marcels.
A multiselection can also be obtained with _S_, which splits the current
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selection according to the regex entered. To split a comma separated list,
use _S_ then ', *'
_s_ and _S_ share the search pattern with _/_, and hence entering an empty
pattern uses the last one.
As a convenience, _alt-s_ allows you to split the current selections on
line boundaries.
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To clear multiple selections, use _space_. To keep only the nth selection
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use _n_ followed by _space_, to remove only the nth selection, use _n_
followed by _alt-space_.
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_alt-k_ allows you to enter a regex and keep only the selections that
contains a match for this regex. using _alt-K_ you can keep the selections
not containing a match.
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Object Selection
----------------
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Some keys allow you to select a text object:
* _alt-a_: selects the whole object
* _alt-i_: selects the inner object, that is the object excluding it's surrounder.
for example, for a quoted string, this will not select the quote, and
for a word this will not select trailing spaces.
* _[_: selects to object start
* _]_: selects to object end
After this key, you need to enter a second key in order to specify which
object you want.
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* _b_, _(_ or _)_: select the enclosing parenthesis
* _B_, _{_ or _}_: select the enclosing {} block
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* _r_, _[_ or _]_: select the enclosing [] block
* _<_ or _>_: select the enclosing <> block
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* _"_: select the enclosing double quoted string
* _'_: select the enclosing single quoted string
* _w_: select the whole word
* _W_: select the whole WORD
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* _s_: select the sentence
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* _p_: select the paragraph
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* _i_: select the current indentation block
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Registers
---------
registers are named list of text. They are used for various purpose, like
storing the last yanked test, or the captures groups associated with the
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selections.
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While in insert mode, ctrl-r followed by a register name (one character)
inserts it.
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For example, ctrl-r followed by " will insert the currently yanked text.
ctrl-r followed by 2 will insert the second capture group from the last regex
selection.
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Registers are lists, instead of simply text in order to interact well with
multiselection. Each selection have it's own captures, or yank buffer.
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Search selection
----------------
Using the _*_ key, you can set the search pattern to the current selection.
This tries to be intelligent. It will for example detect if current selection
begins and/or end at word boundaries, and set the search pattern accordingly.
with _alt-*_ you can set the search pattern to the current seletion without
kakoune trying to be smart.
Basic Commands
--------------
Commands are entered using +:+.
* +e[dit] <filename> [<line> [<column>]]+: 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.
* +w[rite] [<filename>]+: write buffer to <filename> or use it's name if
filename is not given.
* +q[uit]+: exit Kakoune, use quit! to force quitting even if there is some
unsaved buffers remaining.
* +wq+: write current buffer and quit
* +b[uffer] <name>+: switch to buffer <name>
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* +d[el]b[uf] [<name>]+: delete the buffer <name>, use d[el]b[uf]! to force
deleting a modified buffer.
* +source <filename>+: execute commands in <filename>
* +runtime <filename>+: execute commands in <filename>, <filename>
is relative to kak executable path.
* +nameclient <name>+: set current client name
* +namebuf <name>+: set current buffer name
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* +exec [-client <name>] <keys>+: execute <keys> as if pressed in normal mode.
if client if specified, exec keys in the named client context.
* +eval [-client <name>] <command>+: execute <command> as if entered in command line
if client if specified, exec command in the named client context.
* +echo <text>+: show <text> in status line
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* +decl <type> <name> [<value>]+: declare an option, type can be int, str, int-list
and str-list.
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* +set{b,w,g} <option> <value>+: set <option> to <value> in *b*uffer, *w*indow
or *g*lobal scope.
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* +name <name>+: sets current client name to name
* +nop+: does nothing, but as with every other commands, arguments may be
evaluated. So nop can be used for example to execute a shell command
while being sure that it's output will not be interpreted by kak.
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+:%sh{ echo echo tchou }+ will echo tchou in kakoune, whereas
+:nop %sh{ echo echo tchou }+ will not, but both will execute the
shell command.
String syntax
-------------
When entering a command, parameters are separated by whitespace (shell like),
if you want to give parameters with spaces, you should quote them.
Kakoune support three string syntax:
* +"strings" and \'strings\'+: classic strings, use \' or \" to escape the
separator.
* +%\{strings\}+: these strings are very useful when entering commands
- the '{' and '}' delimiter are configurable: you can use any non
alphanumeric character. like %[string], %<string>, %(string), %~string~
or %!string!...
- if the character following the % is one of {[(<, then the closing one is
the matching }])> and the delimiters are not escapable but are nestable.
for example +%{ roger {}; }+ is a valid string, +%{ marcel \}+ as well.
Highlighters
------------
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Manipulation of the displayed text is done through highlighters, which can be added
or removed with the command
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-----------------------------------------------------
:addhl <highlighter_name> <highlighter_parameters...>
-----------------------------------------------------
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and
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----------------------
:rmhl <highlighter_id>
----------------------
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existing highlighters are:
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* +number_lines+: show line numbers
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* +group <group_name>+: highlighter group, containing other highlighters.
useful when multiple highlighters work together and need to be
removed as one. Adding and removing from a group can be done using
`:addhl -group <group> <highlighter_name> <highlighter_parameters...>`
`:rmhl -group <group> <highlighter_name>`
* +regex <ex> <color>...+: highlight a regex, takes the regex as first parameter,
followed by any number of color parameters. color format is:
<capture_id>:<fg_color>[,<bg_color>]
For example: `:addhl regex //(\h+TODO:)?[^\n]+ 0:cyan 1:yellow,red`
will highlight C++ style comments in cyan, with an eventual 'TODO:' in
yellow on red background.
* +search <color>+: highlight every matches to the current search pattern. takes
one parameter for the color to apply to highlighted elements.
* +flag_lines <flag> <option_name>+: add a column in front of text, and display the
given flag in it for everly lines contained in the int-list option named
<option_name>.
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Filters
-------
Filters can be installed to interact with buffer modifications. They can be
added or removed with
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-----------------------------------------------
:addfilter <filter_name> <filter_parameters...>
-----------------------------------------------
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and
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---------------------
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:rmfilter <filter_id>
---------------------
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exisiting filters are:
* +preserve_indent+: insert previous line indent when inserting a newline
* +cleanup_whitespaces+: remove trailing whitespaces on the previous line
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when inserting an end-of-line.
* +expand_tabulations+: insert spaces instead of tab characters
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* +regex <line_regex> <insert_regex> <replacement>+: when the current line regex
and inserted text regex matches, replace insereted text with the
replacement text. Capture groups are available through $[0-9] escape
sequence, and cursor position can be specified with $c.
* +group+: same as highlighters group
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Hooks
-----
commands can be registred to be executed when certain events arise.
to register a hook, use the hook command.
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------------------------------------------------------
:hook <scope> <hook_name> <filtering_regex> <commands>
------------------------------------------------------
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<scope> can be either global, buffer or window, the scope are hierarchical,
meaning that a Window calling a hook will execute it's own, the buffer ones
and the global ones.
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<command> is a string containing the commands to execute when the hook is
called.
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for example, to automatically use line numbering with .cc files,
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use the following command:
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-----------------------------------------------------
:hook global WinCreate .*\.cc %{ addhl number_lines }
-----------------------------------------------------
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existing hooks are:
* +NormalIdle+: A certain duration has passed since last key was pressed in
normal mode.
* +NormalBegin+: Entering normal mode
* +NormalEnd+: Leaving normal mode
* +NormalKey+: A key is received in normal mode, the key is used for filtering
* +InsertIdle+: A certain duration has passed since last key was pressed in
insert mode.
* +InsertBegin+: Entering insert mode
* +InsertEnd+: Leaving insert mode
* +InsertKey+: A key is received in insert mode, the key is used for filtering
* +InsertMove+: The cursor moved (without inserting) in insert mode, the key
that triggered the move is used for filtering
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* +WinCreate+: A window was created, the filtering text is the buffer name
* +WinDisplay+: A window was bound a client, the filtering text is the buffer
name
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* +WinSetOption+: An option was set in a window context, the filtering text
is '<option_name>=<new_value>'
* +BufNew+: A buffer for a new file has been created, filename is used for
filtering
* +BufOpen+: A buffer for an existing file has been created, filename is
used for filtering
* +BufCreate+: A buffer has been created, filename is used for filtering
* +RuntimeError+: an error was encountered while executing an user command
the error message is used for filtering
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* +KakBegin+: Kakoune started, this is called just after reading the user
configuration files
* +KakEnd+: Kakoune is quitting.
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when not specified, the filtering text is an empty string.
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Color Aliases
-------------
Colorspec takes the form <fg_color>[,<bg_color>], they can be named using the
following command.
--------------------------
:colalias <name> <colspec>
--------------------------
note that colspec can itself be a color alias.
Using color alias instead of colorspec permits to change the effective colors
afterward.
there are some builtins color aliases:
* +PrimarySelection+: main selection color for every selected character except
the last one
* +SecondarySelection+: secondary selection color for every selected character
except the last one
* +PrimaryCursor+: last character of the primary selection
* +SecondaryCursor+: last character of the secondary selection
* +LineNumbers+: colors used by the number_lines highlighter
* +MenuForeground+: colors for the selected element in menus
* +MenuBackground+: colors for the not selected elements in menus
* +Information+: colors the informations windows and information messages
* +Error+: colors of error messages
* +StatusLine+: colors used for the status line
* +StatusCursor+: colors used for the status line cursor
* +Prompt+: colors used prompt displayed on the status line
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Shell expansion
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---------------
A special string syntax is supported which replace it's content with the
output of the shell commands in it, it is similar to the shell $(...)
syntax and is evaluated only when needed.
for example: %sh{ ls } is replaced with the output of the ls command.
Some of kakoune state is available through environment variables:
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* +kak_selection+: content of the main selection
* +kak_selections+: content of the selection separated by commas
* +kak_bufname+: name of the current buffer
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* +kak_timestamp+: timestamp of the current buffer, the timestamp is an
integer value which is incremented each time the buffer is modified.
* +kak_runtime+: directory containing the kak binary
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* +kak_opt_<name>+: value of option <name>
* +kak_reg_<r>+: value of register <r>
* +kak_socket+: filename of session socket (/tmp/kak-<session>)
* +kak_client+: name of current client
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* +kak_cursor_line+: line of the end of the main selection
* +kak_cursor_cursor+: column of the end of the main selection
* +kak_hook_param+: filtering text passed to the currently executing hook
for example you can print informations on the current file in the status
line using:
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-------------------------------
:echo %sh{ ls -l $kak_bufname }
-------------------------------
Register and Option expansion
-----------------------------
Similar to shell expansion, register contents and options values can be
accessed through %reg{<register>} and %opt{<option>} syntax.
for example you can display last search pattern with
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-------------
:echo %reg{/}
-------------
Defining Commands
-----------------
new commands can be defined using the +def+ command.
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------------------------------
:def <command_name> <commands>
------------------------------
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<commands> is a string containing the commands to execute
def can also takes some flags:
* +-env-params+: pass parameters given to commands in the environement as
kak_paramN with N the parameter number
* +-shell-params+: pass parameters given to commands as positional parameters
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to any shell expansions used in the command.
* +-file-completion+: try file completion on any parameter passed
to this command
* +-shell-completion+: following string is a shell command which takes
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parameters as positional params and output one
completion candidate per line.
* +-allow-override+: allow the new command to replace an exisiting one
with the same name.
Using shell expansion permits to define complex commands or to access
kakoune state:
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------------------------------------------------------
:def print_selection %{ echo %sh{ ${kak_selection} } }
------------------------------------------------------
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Some helper commands can be used to define composite commands:
* +menu <label1> <commands1> <label2> <commands2>...+: display a menu using
labels, the selected label's commands are executed.
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+menu+ can take a -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).
* +info <text>+: display text in an information box, at can take a -anchor
option, which accepts +left+, +right+ and +cursor+ as value, in order to
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specify where the info box should be anchored relative to the main selection.
* +try <commands> catch <on_error_commands>+: prevent an error in <commands>
from aborting the whole commands execution, execute <on_error_commands>
instead.
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* +reg <name> <content>+: set register <name> to <content>
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Note that these commands are available in interactive command mode, but are
not that useful in this context.
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FIFO Buffer
-----------
the +edit+ command can take a -fifo parameter:
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-----------------------------------
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:edit -fifo <filename> <buffername>
-----------------------------------
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in this case, a buffer named +<buffername>+ is created which reads its content
from fifo +<filename>+. When the fifo is written to, the buffer is automatically
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updated.
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This is very useful for running some commands asynchronously while displaying
their result in a buffer. See rc/make.kak and rc/grep.kak for examples.
When the buffer is deleted, the fifo will be closed, so any program writing
to it will receive SIGPIPE. This is usefull as it permits to stop the writing
program when the buffer is deleted.
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Menus
-----
When a menu is displayed, you can use *j*, *control-n* or *tab* to select the next
entry, and *k*, *control-p* or *shift-tab* to select the previous one.
Using the */* key, you can enter some regex in order to restrict available choices
to the matching ones.
Kakrc
-----
The kakrc file next to the kak binary (in the src directory for the moment)
is a list of kak commands to be executed at startup.
The current behaviour is to execute local user commands in the file
$HOME/.config/kak/kakrc and in all files in $HOME/.config/kak/autoload
directory
Place links to the files in src/rc/ in your autoload directory in order to
execute them on startup, or use the runtime command (which sources relative
to the kak binary) to load them on demand.
Existing commands files are:
* *rc/kakrc.kak*: provides kak commands files autodetection and highlighting
* *rc/cpp.kak*: provides c/c++ files autodetection and highlighting and the +alt+
command for switching from c/cpp file to h/hpp one.
* *rc/asciidoc.kak*: provides asciidoc files autodetection and highlighting
* *rc/diff.kak*: provides patches/diff files autodetection and highlighting
* *rc/git.kak*: provides various git format highlighting (commit message editing,
interactive rebase)
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* *rc/git-tools.kak*: provides some git integration, like +git-blame+, +git-show+
or +git-diff-show+
* *rc/make.kak*: provides the +make+ and +errjump+ commands along with highlighting
for compiler output.
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* *rc/man.kak*: provides the +man+ command
* *rc/grep.kak*: provides the +grep+ and +gjump+ commands along with highlighting
for grep output.
* *rc/global.kak*: provides the +tag+ command to jump on a tag definition using
gnu global tagging system.
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* *rc/ctags.kak*: provides the +tag+ command to jump on a tag definition using
exuberant ctags files, this script requires the *readtags* binary, available
in the exuberant ctags package but not installed by default.
* *rc/client.kak*: provides the +new+ command to launch a new client on the current
session, if tmux is detected, launch the client in a new tmux split, else
launch in a new terminal emulator.
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* *rc/clang.kak*: provides the +clang-enable-autocomplete+ command for C/C++
insert mode completion support. This needs uses clang++ compiler.
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Certain command files defines options, such as +grepcmd+ (for :grep) +makecmd+
(for :make) or +termcmd+ (for :new).
Some options are shared with commands. grep and make honor the +toolsclient+ option,
if specified, to open their buffer in it rather than the current client. man honor
the +docsclient+ option for the same purpose.