private function getOptionString(OptionDefinition $option)
    {
        $short = $option->getShort();
        $long = $option->getLong();
        $result = ' ';
        if ($short !== null && $long !== null) {
            $result .= '-' . $short . ', --' . $long;
        } else {
            $result .= $short !== null ? '-' . $short : '--' . $long;
        }
        return $result;
    }