public function getParser()
    {
        if (true === empty($this->parser)) {
            $typeParserClassName = sprintf('\ReadmeGen\Vcs\Type\%s', ucfirst($this->config['vcs']));

            if (false === class_exists($typeParserClassName)) {
                throw new \InvalidArgumentException(sprintf('Class "%s" does not exist', $typeParserClassName));
            }

            $this->parser = new Parser(new $typeParserClassName());
        }

        return $this->parser;
    }