#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2018 IPFire Network Development Team                          #
#                                                                             #
# This program is free software: you can redistribute it and/or modify        #
# it under the terms of the GNU General Public License as published by        #
# the Free Software Foundation, either version 3 of the License, or           #
# (at your option) any later version.                                         #
#                                                                             #
# This program is distributed in the hope that it will be useful,             #
# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
# GNU General Public License for more details.                                #
#                                                                             #
# You should have received a copy of the GNU General Public License           #
# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
#                                                                             #
###############################################################################

led_exists() {
	local led="${1}"
	assert isset led

	file_exists "/sys/class/leds/${led}"
}

led_get_supported_triggers() {
	local led="${1}"

	if ! led_exists "${led}"; then
		error "LED ${led} does not exist"
		return ${EXIT_ERROR}
	fi

	local triggers="$(fread "/sys/class/leds/${led}/trigger")"

	# Filter markers for active trigger
	print "${triggers//[\[\]]/}"
}

led_set_trigger() {
	local led="${1}"
	local trigger="${2}"

	assert isset led
	assert isset trigger

	local supported_triggers="$(led_get_supported_triggers "${led}")"
	if ! list_match "${trigger}" ${supported_triggers}; then
		log DEBUG "Trigger ${trigger} is not supported by LED ${led}"
		return ${EXIT_ERROR}
	fi

	log DEBUG "Setting LED trigger ${trigger} for ${led}"
	fwrite "/sys/class/leds/${led}/trigger" "${trigger}"
}