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#!/bin/bash
# udt-keyboard: light the Ajazz AK820 Pro in the wallpaper accent.
# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
# Licensed under the GNU General Public License v2 only.
#
# Usage: udt-keyboard set the keyboard to the current accent
# udt-keyboard --watch do that again every time it is plugged in
#
# The colour is the one udt-accent wrote for rofi, so the keyboard follows the
# wallpaper like the window borders do. udt-accent starts this detached on
# every run; the watcher is started from hypr-theme's autostart, because the
# keyboard only takes commands over the USB cable and may be plugged in long
# after the last wallpaper change.
#
# Talks to the keyboard through ak820-ctl, which the udev rule shipped with it
# lets the logged-in user drive without root. Without ak820-ctl, or with the
# keyboard on the 2.4G dongle or Bluetooth, this does nothing.
command -v ak820-ctl >/dev/null || exit 0
# "launch": dark until a key is pressed, which lights outward along its row.
MODE=launch
apply() {
local accent
accent="$(grep -o 'accent: #[0-9a-fA-F]\{6\}' "$HOME/.cache/udt/udt-accent.rasi" 2>/dev/null)"
[ -n "$accent" ] || return 0
# A wallpaper change and a plug-in can land together, and two interleaved
# off/mode pairs leave the keyboard on whichever off came last.
exec 9>"${XDG_RUNTIME_DIR:-/tmp}/udt-keyboard.lock"
flock 9
# This firmware ignores a mode change unless the lights were turned off
# first and given time to settle; one second was not enough, three is.
ak820-ctl light off >/dev/null 2>&1 || return 0
sleep 3
ak820-ctl light "$MODE" -c "${accent#accent: #}" >/dev/null 2>&1
}
if [ "$1" != --watch ]; then
apply
exit
fi
# One usb_device event per plug-in; its interfaces and hidraw nodes would each
# fire again. udevadm prints an event once its rules have run, so the uaccess
# ACL is already in place, but the keyboard needs a moment to boot.
/sbin/udevadm monitor --udev --subsystem-match=usb/usb_device --property |
while read -r line; do
case "$line" in
ACTION=*) action="${line#ACTION=}" ;;
PRODUCT=c45/8009/*) [ "$action" = add ] && { sleep 2; apply; } & ;;
esac
done
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