#!/usr/bin/env sh

applyptrmatrix() {
  PTRID="$(  
    xinput | grep -iE 'touchscreen.+pointer' | grep -oE 'id=[0-9]+' | cut -d= -f2
  )"
  xinput set-prop "$PTRID" --type=float --type=float "Coordinate Transformation Matrix" "$@"
}

isrotated() {
  xrandr | grep primary | cut -d' ' -f 5 | grep right && return 0
  return 1
}

rotnormal() {
  xrandr -o normal
  applyptrmatrix 0 0 0 0 0 0 0 0 0
  exit 0
}

rotright() {
  xrandr -o right
  applyptrmatrix 0 1 0 -1 0 1 0 0 1
  exit 0
}

rotate() {
  isrotated && rotnormal || rotright
}

rotate