Add support for :all in rules

[wismill]

This PR adds support for the :all modifier in rules & include statements.

For example, the xkeyboard-config issue “rules: add custom per-group mapping for level3(ralt_alt)” could be solved easier with this feature:

! layout        option	        = symbols
*               lv3:ralt_alt    = +level3(ralt_alt):all

xkbcomp would require a patch too, though (see the corresponding xkbcomp issue).

This feature works by detecting the number of layouts in the RMLVO configuration. Example: it will replace the include statement xx:all by xx:1+xx:2+xx:3 if there are 3 layouts and the merge mode is “override”.

Caveat: it only works when a keymap is created from RMLVO configuration; i.e. it will not work when creating a keymap e.g. from a string. But I guess this case is not so important, because as I understand querying the keymap to the windows system will return a complete & resolved keymap without include statements.

Note: this could the first step to remove the limit of layout number (see #37 and #311, @bam80).

[bam80]

Thanks for notifying me Wismill!
Looking forward to get this merged.

[bam80]

For example, the xkeyboard-config issue “rules: add custom per-group mapping for level3(ralt_alt)” could be solved easier with this feature:

! layout        option	        = symbols
*               lv3:ralt_alt    = +level3(ralt_alt):all

Could we actually make it easier as part of this PR?

[wismill]

You mean patching the rule file in xkeyboard-config ? Different project; it will require X11 xkbcomp to be patched before.

[bam80]

OK, do you consider to make a patch for X11 xkbcomp also?

[wismill]

OK, do you consider to make a patch for X11 xkbcomp also?

@bam80 Let’s focus on this PR. Having a first draft enables us to discuss its design with the experts @whot and @bluetech. I also have to fix the tests first!

[bluetech]

@wismill I'd like to review this PR (it'd be really great to fix this!), it might take me a bit of time to get to it though, wanted to give you a heads up.

[wismill]

No rush, currently the tests are failing. I am content waiting for your review: I would like to get the design right, as it would be wonderful to port it to X11’s xkbcomp then start moving things in xkeyboard-config. Though it would probably take years to transition the rules, if distros need to first pickup compatible xkbcomp.

[wismill]

Closing. I am working on another approach, where the processing happens only in the rules. This should facilitate a possible adaptation to libxkbfile.