#!/bin/sh
# ==================================
# License : The Unlicense
# Author  : sabr@ariamath.xyz
# Version : 0.0.1
# ==================================
# Honestly, brightnessctl is bloat.
# ==================================
device="$(find /sys/class/backlight/*)"
fmax="$device/max_brightness"
fnow="$device/brightness"
m="$(cat "$fmax")"
c="$(cat "$fnow")"
if [ $# -gt 1 ];
then
	case "$1" in
		"-s") printf "%d" $(($2 * m / 100)) > "$fnow";;
		"-i") printf "%d" $((c + $2 * m / 100)) > "$fnow";;
		"-d") printf "%d" $((c - $2 * m / 100)) > "$fnow";;
	esac
else
	case "$1" in
		"-v")
			printf "brl v0.0.1\n"
			printf "A simple brightness control program\n"
		;;
		"-h")
			printf "brl [options] [value]\n"
			printf " -s   set brightness %%\n"
			printf " -i   increase brightness %%\n"
			printf " -d   decrease brightness %%\n"
		;;
		*)
			printf "Current brightness: %d%% (%d)\n"\
				$((c * 100 / m)) "$c"
		;;
	esac
fi