#!/bin/sh
# Change the LEDs of a DualShock4 Controller

usage() {
	printf '%s\n' "usage: ${0##*/} hex|rgb color" \
	              "${0##*/} accepts hex values (ffffff) or rgb values (255,255,255)"
}

[ "$2" ] || { usage; exit 1; }

hex2rgb() {
	hex=$1
	hex_r=${hex%????}
	hex_g=${hex#??}; hex_g=${hex_g%??}
	hex_b=${hex#????}
	printf '%d,%d,%d' "0x$hex_r" "0x$hex_g" "0x$hex_b"
}

ds4leds() {
	vendorid="054C"
	productid="05C4"
	led_path="/sys/class/leds"

	IFS=, read -r rgb_r rgb_g rgb_b <<-EOF
	$1
	EOF

	printf '%s' "$rgb_r" | tee "$led_path/"*"$vendorid:$productid"*":red/brightness" > /dev/null
	printf '%s' "$rgb_g" | tee "$led_path/"*"$vendorid:$productid"*":green/brightness" > /dev/null
	printf '%s' "$rgb_b" | tee "$led_path/"*"$vendorid:$productid"*":blue/brightness" > /dev/null
}

case $1 in
	hex      ) ds4leds "$(hex2rgb "$2")" ;;
	rgb      ) ds4leds "$2" ;;
	*h|*help ) usage; exit 0 ;;
esac