protected function listRunnables()
	{
		$commands = array_values(Command::getRegisteredCommands());
		$format = "| %8.60s | %-50.30s\n";
		
		printf($format, "id", "class");
		$this->env->sendOutput('-----------------------------------');
		foreach($commands as $runnable) {
			printf($format, $runnable->getId(), get_class($runnable));
			$this->env->sendOutput('-----------------------------------');
		}
	}