Compose(5) File Formats Manual Compose(5)
Compose - X client mappings for multi-key input sequences
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:
There are several 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)
%L expands to the name of the locale specific Compose file (i.e., "/usr/share/X11/locale/<localename>/Compose")
%S expands to the name of the system directory for Compose files (i.e., "/usr/share/X11/locale")
For example, you can include in your compose file the default Compose file by using:
and then rewrite only the few rules that you need to change. New compose rules can be added, and previous ones replaced.
Compose files are plain text files, with a separate line for each compose sequence. Comments begin with # characters. Each compose
sequence specifies one or more events and a resulting input sequence, with an optional comment at the end of the line:
EVENT [EVENT...] : RESULT [# COMMENT]
Each event consists of a specified input keysym, and optional modifier states:
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 "