#!/bin/bash
set -ex

EXTERNAL="$(xrandr | grep 'DisplayPort.* connected' | cut -d' ' -f1)"

map_wacom () {
	xsetwacom set 'Wacom Intuos S Pen stylus' MapToOutput $1 2>/dev/null || true
}

if [ -z "$EXTERNAL" ]; then
	# No external display; only use laptop screen
	xrandr --output eDP --primary --auto --output $EXTERNAL --off
	map_wacom eDP
else
	# External display; check if it is currently used
	set +e
	xrandr --listactivemonitors | grep $EXTERNAL >/dev/null
	RESULT=$?
	set -e
	if [ $RESULT -eq 0 ]; then
		# External display in use; disable
		xrandr --output eDP --primary --auto --output $EXTERNAL --off
		map_wacom eDP
	else
		# External display not in use; enable
		xrandr --output eDP --auto --below $EXTERNAL --primary --output $EXTERNAL --auto
		map_wacom $EXTERNAL
	fi
fi

# Reset background
setbg