rotate touch screen with external monitors

gistfile1.txt

#!/bin/sh

function map_to_display(){
    xinput map-to-output "Wacom Pen and multitouch sensor Finger touch" $1
    xinput map-to-output "Wacom Pen and multitouch sensor Pen stylus" $1
    xinput map-to-output "Wacom Pen and multitouch sensor Pen eraser" $1
}

function rotate_touch(){
    xinput set-prop "Wacom Pen and multitouch sensor Finger touch" "Wacom Rotation" $1
    xinput set-prop "Wacom Pen and multitouch sensor Pen stylus" "Wacom Rotation" $1
    xinput set-prop "Wacom Pen and multitouch sensor Pen eraser" "Wacom Rotation" $1
}

for x in $@
do
  case $x in

    eDP1)     map_to_display eDP1 ;;

    DP1)      map_to_display DP1  ;;

    DP2)      map_to_display DP2  ;;

    normal)   rotate_touch 0      ;;

    left)     rotate_touch 1      ;;

    right)    rotate_touch 2      ;;

    invert)   rotate_touch 3      ;;

    *)        exit 0              ;;

  esac
done