#!/bin/bash
FILE=/sys/class/backlight/amdgpu_bl1/brightness
if ! ( test -w "$FILE" ); then
	xterm +cm -cr RED -bg BLACK -selbg WHITE -selfg BLACK -fg WHITE -fa Monospace -fs 14 -e "sudo chmod 777 $FILE"
fi
new=$(cat $FILE)


if [ "$1" = "up" ]; then
	new=$((new + 13))
elif [ "$1" = "down" ];then
	new=$((new - 13))
fi

if [ $new -gt 255 ]; then
	new=255
elif [ $new -lt 0 ]; then
	new=0
fi

echo $new > $FILE