#!/usr/bin/env bash

output=eDP-1
brightness=?

get_brighntess() {
    brightness=$(xrandr --verbose | grep -m 1 Brightness | awk '{printf "%d", $2*100}')
}

set_brightness() {
    brightness=$1
    if [ "$brightness" -gt 100 ]; then
        brightness=100
    fi
    if [ "$brightness" -lt 0 ]; then
        brightness=0
    fi
    xrandr --output $output --brightness $(echo $brightness | awk '{printf "%0.2f", $1/100}' )
}

get_brighntess

case $BLOCK_BUTTON in
    4) set_brightness $((brightness + 10 ))
        ;; # scroll up

    5) set_brightness $((brightness - 10 ))
        ;; # scroll down
esac

echo $brightness