libinput 1.30 Released With Support For Writing Plug-Ins In Lua

libinput-swap-left-right-button.lua

-- https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1192  

  libinput:register(1)

  function frame(device, frame)
      for _, v in ipairs(frame.events) do
          if v.type == evdev.EV_KEY then
              if v.code == evdev.BTN_RIGHT then
                  v.code = evdev.BTN_LEFT
              elseif v.code == evdev.BTN_LEFT then
                  v.code = evdev.BTN_RIGHT
              end
          end
      end
      return frame
  end

  function device_new(plugin, device)
      local codes = device:event_codes()
      if codes[evdev.EV_KEY] and codes[evdev.EV_KEY][evdev.BTN_LEFT] and codes[evdev.EV_KEY][evdev.BTN_RIGHT] then
          device:connect("evdev-frame", frame)
      end
  end

  libinput:connect("new-evdev-device", device_new)