#!/bin/bash
#----------------------------------------------------------------
# backlight — Screen brightness control using brightnessctl
#
# Replaces the old ratflow backlight script (xbacklight-based).
# brightnessctl works on Wayland without X11 dependencies.
#
# Usage:
#   backlight up     — increase brightness by 5%
#   backlight down   — decrease brightness by 5%
#   backlight set N  — set brightness to N percent
#   backlight get    — print current brightness percentage
#
# Dependencies: brightnessctl
#----------------------------------------------------------------

STEP=5

case "$1" in
    up)
        brightnessctl set "${STEP}%+" -q
        ;;
    down)
        brightnessctl set "${STEP}%-" -q
        ;;
    set)
        brightnessctl set "${2}%" -q
        ;;
    get)
        brightnessctl info | grep -oP '\d+%' | head -1 | tr -d '%'
        ;;
    *)
        echo "Usage: backlight {up|down|set N|get}"
        exit 1
        ;;
esac