public static function defineDirectoryStructure(Event $event)
    {
        $options = static::getOptions($event);

        if (!getenv('SENSIOLABS_ENABLE_NEW_DIRECTORY_STRUCTURE') || !$event->getIO()->askConfirmation('Would you like to use Symfony 3 directory structure? [y/N] ', false)) {
            return;
        }

        $rootDir = getcwd();
        $appDir = $options['symfony-app-dir'];
        $webDir = $options['symfony-web-dir'];
        $binDir = static::$options['symfony-bin-dir'] = 'bin';
        $varDir = static::$options['symfony-var-dir'] = 'var';

        static::updateDirectoryStructure($event, $rootDir, $appDir, $binDir, $varDir, $webDir);
    }