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dotfiles/.local/bin/sbacklight

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#!/usr/bin/env sh
######################################################################
# @author : swytch
# @file : sbacklight
# @license : GPLv3
# @created : Wednesday May 20, 2020 18:22:36 CEST
#
# @description : control screen brightness
######################################################################
## You need write privileges on /sys/.../brightness
## This can be achieved via a `udev` rule (see ~/.config/root)
current=$(cat /sys/class/backlight/intel_backlight/brightness)
max=$(cat /sys/class/backlight/intel_backlight/max_brightness)
step=$(expr $max / 20)
[ "$1" = "dec" ] && new=$(expr $current - $step)
[ "$1" = "inc" ] && new=$(expr $current + $step)
[ "$1" = "set" ] && new=$(expr $2 \* $step)
[ $new -gt 850 ] && new=850
[ $new -lt 0 ] && new=0
echo $new > /sys/class/backlight/intel_backlight/brightness