#!/bin/bash
# zephyrus-kbd-notify — shows the keyboard backlight's level when it changes. The level itself is set
# by the firmware and asusd (Fn+F2/F3), which tell UPower; this only listens and notifies. Started once
# per session from the module's i3 fragment. Shipped by the mesh's asus-zephyrus-g14 module.
#
# One instance per session: i3 runs its `exec` lines again on an in-place restart, and the
# predecessor's listener ran twice after one, showing every change twice.
set -u
here=$(dirname "$0")
lock="${XDG_RUNTIME_DIR:-/run/user/$(id -u)}/zephyrus-kbd-notify.lock"
exec 9>"$lock"
flock -n 9 || exit 0
levels=(Off Low Med High)
dbus-monitor --system "type='signal',interface='org.freedesktop.UPower.KbdBacklight',member='BrightnessChanged'" 2>/dev/null |
	while read -r line; do
		if [[ $line =~ int32\ ([0-9]+) ]]; then
			v=${BASH_REMATCH[1]}
			"$here/zephyrus-notify" 5556 "Keyboard: ${levels[$v]:-$v}"
		fi
	done