#!/bin/sh

type xbacklight >/dev/null 2>&1 || {
	echo >&2 "I require xbacklight but it's not installed.  Aborting."
	exit 1
}
type dunstify >/dev/null 2>&1 || {
	echo >&2 "I require dunstify but it's not installed.  Aborting."
	exit 1
}

case $1 in
"up"*)
	xbacklight -inc 10 &
	currentBrightness=$(xbacklight -get)
	dunstify -r 1 'brightness up'\ \($currentBrightness%\)
	;;
"down"*)
	xbacklight -dec 10 &
	currentBrightness=$(xbacklight -get)
	dunstify -r 1 'brightness down'\ \($currentBrightness%\)
	;;
esac