kmx git

rules: Add support for index ranges

There is a lot of repetition in the current rules files provided by
xkeyboard-config, because the MLVO mappings need to match on the exact
layout/variant index. This also prevents to increase the number of
maximum groups, because it does not scale.

We introduces the following new special layout/variant indexes:
- “single”: matches a single layout; same as with no index.
- “first”: matches the first layout/variant, no matter how many layouts
  are in the RMLVO configuration. It allows to merge `layout` and
  `layout[1]` patterns.
- “later”: matches all but the first layout. This is an index range.
- “any”: matches layout at any position. This is an index range.

We also introduces the new `%i` expansion, which correspond to the index
of the matched layout in a mapping with an index range. Example:

    layout[later] = symbols
    my_layout     = +my_symbols:%i
    *             = +%l[%i]:%i

Let’s have a look at concrete examples from xkeyboard-config:

    ! model     layout     = symbols
      *         *          = pc+%l%(v)
    ! model     layout[1]  = symbols
      *         *          = pc+%l[1]%(v[1])
    ! model     layout[2]  = symbols
      *         *          = +%l[2]%(v[2])
    ! model     layout[3]  = symbols
      *         *          = +%l[3]%(v[3])
    ! model     layout[4]  = symbols
      *         *          = +%l[4]%(v[4])

    ! layout    option     = symbols
      *         grp:toggle = +group(toggle)
    ! layout[1] option     = symbols
      *         grp:toggle = +group(toggle):1
    ! layout[2] option     = symbols
      *         grp:toggle = +group(toggle):2
    ! layout[3] option     = symbols
      *         grp:toggle = +group(toggle):3
    ! layout[4] option     = symbols
      *         grp:toggle = +group(toggle):4

With this commit we can now simplify it into:

    ! model    layout[first] = symbols
      *        *             = pc+%l[%i]%(v[%i])
    ! model    layout[later] = symbols
      *        *             = +%l[%i]%(v[%i]):%i

    ! layout[any] option     = symbols
      *           grp:toggle = +group(toggle):%i

The latter rule will work even if we increase XKB_MAX_GROUPS, whereas
the former would require to add the missing entries for the new groups.

In order to maintain consistent rules, we now disallow layout and
variant to have different indexes. For example, the following mapping
are now invalid:
- layout variant[1]
- layout[1] variant[2]
- layout[1] variant
- layout[first] variant[1]
- layout[first] variant
- layout variant[any]
- etc.
kc3-lang/libxkbcommon/test/data/.editorconfig

Commit

test/data/.editorconfig
