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Add Compose support #36

Merged
merged 3 commits into from
Feb 14, 2022
Merged

Add Compose support #36

merged 3 commits into from
Feb 14, 2022

Commits on Feb 14, 2022

  1. uxkb: add Compose (dead-key) support 

    The code is partially based on and partially inspired by Ran Benita's
code at bluetech@89aeb0f.

The main difference is that Compose support is enabled by default,
instead of requiring an extra command-line option.

Dead keys are special keys which have no immediate effect when pressed,
but instead they modify the result of subsequent keys. For example,
pressing the <`> key (the dead key) and then <u> may produce the symbol
ú. Such sequences can be more elaborate and consist of several keysyms.

The compose mechanism has two main pieces of configuration:

1. The Compose file, which defines the compose sequences. It is picked
   by the user's locale. See the Compose(5) man page; most of it is
   supported. These files are currently a part of libX11, but some users
   write their own. For example:
   /usr/share/X11/locale/en_US.UTF-8/Compose

2. The user's XKB keymap, which defines which keys are dead keys (that
   is, produce keysyms of the form dead_*, which are normally used in
   Compose sequences) and which key is the Compose key (which starts
   many Compose sequences). For example, the us 'intl' variant.

This feature (and more) is usually provided by an input method. But we
use the lightweight support provided by xkbcommon.
    @viccie30
    viccie30 committed Feb 14, 2022
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  2. Add --xkb-compose-file option 

    Analogously to --xkb-keymap this allows a user to directly specify an
Xkb compose file. This overrides the automatic creation of a compose
table from the current locale.
    @viccie30
    viccie30 committed Feb 14, 2022
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  3. Wire up Compose support in libuterm 

    Feed all key events into the Compose state and use the resulting
keysyms.
    @viccie30
    viccie30 committed Feb 14, 2022
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