#!/bin/bash

dftScreen="LVDS1"

screens=$(xrandr | grep " connected" | cut -f 1 -d ' ' | grep -v "LVDS")
screen=$(echo $screens | head -n 1)

case "$1" in
"reset")
	xrandr --auto
	;;
"left")
	[ -z "$screen" ] && >&2 echo "No screen connected." && exit 1
	xrandr --output "$screen" --left-of "$dftScreen" --auto
	;;
"right")
	[ -z "$screen" ] && >&2 echo "No screen connected." && exit 1
	xrandr --output "$screen" --right-of "$dftScreen" --auto
	;;
*)
	>&2 echo -e "Missing argument. Usage:\n$0 [reset|left|right]"
	;;
esac