#!/bin/sh

[ -z $IS_LAPTOP ] && exit 

blpath=/sys/class/backlight/intel_backlight

max=$(cat $blpath/max_brightness)
current=$(cat $blpath/brightness)
if [ -z $1 ]
then 
	printf %.0f\\n $(echo "$current/$max * 100" | bc -l) 
	exit
elif (( $1 < 10 ))
then
	perc=10
elif (( $1 > 100 ))
then
	perc=100
else
	perc=$1
fi

brightness="$(($max * $perc / 100))"
echo $brightness > $blpath/brightness