#!/bin/sh

main=LVDS1
a=VGA1
b=HDMI1
dir=left

function on {
	echo Switching $1 on
	xrandr --output $1 --auto --$dir-of $main
}

function off {
	echo Switching $1 off
	xrandr --output $1 --off
}

function check {
	xrandr | egrep "$1 connected" >/dev/null
	echo $?
}

outa=$(check $a)
outb=$(check $b)

[[ $outa -ne 0 ]] && off $a
[[ $outb -ne 0 ]] && off $b

[[ $outa -ne 0 && $outb -ne 0 ]] && exit
[[ $outa -eq 0 && $outb -ne 0 ]] && on $a && exit
[[ $outa -ne 0 && $outb -eq 0 ]] && on $b && exit

xrandr | egrep "$a connected [0-9]+" >/dev/null
outa=$?
xrandr | egrep "$b connected [0-9]+" >/dev/null
outb=$?

if [[ $outa -eq 0 ]]; then
	off $a
	on $b
else
	off $b
	on $a
fi