#!/bin/sh
case "$*" in
	+*) action="+" ;;
	-*) action="-" ;;
	*) action="=" ;;
esac
value="$(echo "$*" | tr -dc '[[:digit:]]')"

if [ -n "$(command -v xbacklight)" ] ; then
	[ "$action" = "+" ] && action="-inc"
	[ "$action" = "-" ] && action="-dec"
	[ "$action" = "=" ] && action="-set"

	fork xbacklight -time 100 -fps 60 $action $value

	exit 0

elif [ -n "$(command -v ddcutil)" ] ; then
	[ "$action" = "=" ] && action=""

	for bus in 2 3 ; do
		fork ddcutil --bus="$bus" --skip-ddc-checks --noverify setvcp 10 $action $value
	done

	exit 0

fi
exit 1