Compose(5) manual page

Name

Compose - X client mappings for multi-key input sequences

Description

The X library, libX11, provides a simple input method for characters beyond those represented on typical keyboards using sequences of key strokes that are combined to enter a single character.

The compose file is searched for in the following order:

-: If the environment variable $XCOMPOSEFILE is set, its value is used as the name of the Compose file.
-: If the user's home directory has a file named .XCompose, it is used as the Compose file.
-: The system provided compose file is used by mapping the locale to a compose file from the list in /usr/share/X11/locale/compose.dir.

Compose files can use an "include" instruction. This allows local modifications to be made to existing compose files without including all of the content directly. For example, the system's iso8859-1 compose file can be included with a line like this:

include "/usr/share/X11/locale/iso8859-1/Compose"

There are two substitutions that can be made in the file name of the include instruction. %H expands to the user's home directory (the $HOME environment variable), and %L expands to the name of the locale specific Compose file (i.e., "/usr/share/X11/locale/<localename>/Compose").

For example, you can include in your compose file the default Compose file by using:

include "%L"

and then rewrite only the few rules that you need to change. New compose rules can be added, and previous ones replaced.

File Format

EVENT [EVENT...] : RESULT [# COMMENT]

Each event consists of a specified input keysym, and optional modifier states:

[MODIFIER_LIST] <keysym>

Each modifier consists of a specified modifier and a state:

(! MODIFIER ) | None

Modifiers may be preceded by a "~" character to indicate that the modifier must not be present.

The result specifies a string, keysym, or both, that the X client receives as input when the sequence of events is input:

"STRING" | keysym | "STRING" keysym

Keysyms are specified without the XK_ prefix.

Strings may be direct text encoded in the locale for which the compose file is to be used, or an escaped octal or hexadecimal character code. Octal codes are specified as "\123" and hexadecimal codes as "\0x123a". It is not necessary to specify in the right part of a rule a locale encoded string in addition to the keysym name. If the string is omitted, Xlib figures it out from the keysym according to the current locale. I.e., if a rule looks like:

<dead_grave> <A> : "\300" Agrave

the result of the composition is always the letter with the "\300" code. But if the rule is:

<dead_grave> <A> : Agrave

the result depends on how Agrave is mapped in the current locale.

Environment

XCOMPOSEFILE: File to use for compose sequences.
XCOMPOSECACHE: Directory to use for caching compiled compose files.

Files

$HOME/.Xcompose: User default compose file if XCOMPOSEFILE is not set.
/usr/share/X11/locale/compose.dir: File listing the compose file path to use for each locale.
/usr/share/X11/locale/<localemapping>/Compose: System default compose file for the locale, mapped via compose.dir.
/var/cache/libx11/compose/: System-wide cache directory for compiled compose files.
$HOME/.compose-cache/: Per-user cache directory for compiled compose files.

Name

Description

File Format

Environment

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See Also