protected function getProgressBar(InputInterface $input)
    {
        $progress = parent::getProgressBar($input);
        if (!$progress) {
            return null;
        }

        $this->getService('event_dispatcher')->addListener(
            'parser.file.pre',
            function (PreFileEvent $event) use ($progress) {
                $progress->advance();
            }
        );

        return $progress;
    }