#!/bin/sh

# TODO:
#
# - parse maximum resolution from xrandr output

options="$(xrandr | sed -nE 's/^(\w+) connected.*$/\1/p')"
options="$options
auto"

display="$1"
if [ -z "$display" ]; then
	display="$(echo "$options" | zenity --list --text "Select a display to project to:" --column Display)"
fi

case "$display" in
	"")
		# don't change anything
		;;
	external)
		# select external display if one is available
		external="$(echo "$options" | grep -v 'LVDS1\|auto')"
		if [ -n "$external" ]; then
			select-display "$external"
		fi
		;;
	"auto")
		xrandr --auto
		;;
	LVDS1)
		xrandr --output LVDS1 --mode 1366x768 --primary --output DP1 --off
		;;
	DP1)
		xrandr --output LVDS1 --off           --output DP1 --primary --mode 2560x1440
		;;
	*)
		xrandr --output LVDS1 --off           --output "$display" --primary --auto
		;;
esac