#!/usr/bin/env bash

# You can call this script like this:
# $ ./brightnessControl.sh up
# $ ./brightnessControl.sh down

# Script inspired by these wonderful people:
# https://github.com/dastorm/volume-notification-dunst/blob/master/volume.sh
# https://gist.github.com/sebastiencs/5d7227f388d93374cebdf72e783fbd6a

function get_brightness {
  brightnessctl -m | grep -o '[0-9]\+%' | head -c-2
}

function send_notification {
  icon="notification-display-brightness"
  echo $(get_brightness) >"$XDG_RUNTIME_DIR/wobpipe"
}

case $1 in
  up)
    # increase the backlight by 5%
    brightnessctl set +5%
    send_notification
    ;;
  down)
    if [[ $(get_brightness) -lt 5 ]]; then
        # avoid 0% brightness
        brightnessctl set 1%
    else
        # decrease the backlight by 5%
        brightnessctl set 5%-
    fi
    send_notification
    ;;
esac