#!/usr/bin/env bash
set -euf -o pipefail

function send_notification {
  icon="/home/deadguy/.local/share/icons/ArchLabs-Light/24x24/actions/contrast.svg"
  dunstify -i "$icon" -r 5555 -u low " $(printf %.0f%% "$(xbacklight -get)")"
}

case $1 in
  up)
    # increase the backlight by 5%
    xbacklight -inc 5
    send_notification
    ;;
  down)
    # decrease the backlight by 5%
    xbacklight -dec 5
    send_notification
    ;;
esac