public function handleHelpCommand(CommandEvent $event, EventQueueInterface $queue)
    {
        $params = $event->getCustomParams();
        if ($params) {
            $command = strtolower(reset($params));
            $eventName = 'command.' . $command . '.help';
            $this->getEventEmitter()->emit($eventName, array($event, $queue));
        } else {
            $this->listCommands($event, $queue);
        }
    }