input: emit Lua signal for switch toggle events

[jx853]

Description

This adds support for libinput switch devices, including laptop lid switches, tablet mode switches, and keypad slide switches.

When wlroots reports a switch toggle event, somewm now emits the global Lua signal switch::toggle with a table payload:

• device_name: the switch device name
• type: "lid", "tablet_mode", or "unknown" (WLR_SWITCH_TYPE_KEYPAD_SLIDE can be added if wlr 0.19.x version is increased)
• state: "on" or "off"

Closes #519

Test Plan

I tested with the following code and my laptop lid switch. It would be difficult to write a unit test as I don't see an easy way to spoof switch inputs.

awesome.connect_signal("switch::toggle", function(ev)
    naughty.notification {
        urgency = "critical",
        title = "Switch Input",
        text = "device name: " .. ev.device_name
            .. " switch type: " .. ev.type
            .. " state: " .. ev.state,
    }
end)

Checklist

• Lua libraries (lua/awful/, lua/gears/, lua/wibox/, lua/naughty/) are not modified — if a bug surfaces in Lua, the fix belongs in C
• Tests pass (make test-unit && make test-integration)

[sicelo]

Oh this is great! Will test later today or tomorrow hopefully.

[sicelo]

Tested. Works for me as advertised. Thank you so much!

Code looks clean (within the limits of my ability to review it 😄 )

I'm a bit sad we can't support WLR_SWITCH_TYPE_KEYPAD_SLIDE yet due to wlroots 0.19. My device with that switch is the main reason I opened #519, having added support for it to libinput a while before that

[jx853]

It compiles locally for me supporting WLR_SWITCH_TYPE_KEYPAD_SLIDE on wlroots 0.19.3 its just that the CI uses an older version so I had to remove that branch for it to pass. If you use the code from before the force push with the latest version of wlroots it should support that device. See here.

[jx853]

If you compile the current PR with newer wlroots it should register that device as "unknown" so it could still work.

[sicelo]

Oh yeah! I wasn't aware they backported it to 0.19.x! I only followed it up to the time it was accepted in 0.20. I guess we shall bump the version in CI then @trip-zip to the latest 0.19.x release so we can have all libinput supported switches 😄

[jx853]

this commit should pass once they update the CI.

[sicelo]

#625