Adding environment variables to RUN_COMMAND to distinguish between input device types #597

Is your feature request related to a problem? Please describe

Many programs are optimized for touchscreen and I want to specify different behavior for touchscreen and touchpad, but currently it is difficult to distinguish between input sources.

When the touchscreen gesture is turned off

xsetwacom set "Wacom HID 524D Finger touch" Gesture off

1. Some programs such as firefox, krita, support two-finger pinch zoom, the effect of SendKeys way is not as smooth as the native operation, and enable SendKeys will destroy the native operation experience.

2. GNOME Shell 41.2 with 3 and 4 fingers swipe left and right is fixed to switch workspaces, X11Gestures(Version 14) extension also can not set it, if touchegg enabled 3 fingers tile a window, the two operations will happen together.

touchegg.conf

    <gesture type="PINCH" fingers="2" direction="IN">
      <action type="SEND_KEYS">
        <modifiers>Control_L</modifiers>
        <keys>KP_Subtract</keys>
        <repeat>true</repeat>
        <decreaseKeys>KP_Add</decreaseKeys>
      </action>
    </gesture>
    <gesture type="PINCH" fingers="2" direction="OUT">
      <action type="SEND_KEYS">
        <modifiers>Control_L</modifiers>
        <keys>KP_Add</keys>
        <repeat>true</repeat>
        <decreaseKeys>KP_Subtract</decreaseKeys>
      </action>
    </gesture>
    <gesture type="SWIPE" fingers="3" direction="RIGHT">
      <action type="TILE_WINDOW">
        <direction>right</direction>
      </action>
    </gesture>
    <gesture type="SWIPE" fingers="3" direction="LEFT">
      <action type="TILE_WINDOW">
        <direction>left</direction>
      </action>
    </gesture>

Describe the solution you'd like

Provide DeviceType to external commands via environment variables, and the external command determines the actual operation.
For example: DEVICE_TYPE=TOUCHSCREEN

Describe alternatives you've considered

It would also be nice to be able to set the <deviceType> in a configuration file, but this can be more complicated and less flexible.