public function executeCommand($command)
    {
        $cmd = sprintf('%s %s', $this->binaryPath, $command);
        $p = new Process($cmd);
        $p->run();
        if ($p->isSuccessful()) {
            return $p->getOutput();
        } else {
            throw new \RuntimeException(sprintf('pygmentize failed with the error: %s', $p->getErrorOutput()));
        }
    }