public function renderOption(Option $opt)
    {
        $c1 = '';
        if ($opt->short && $opt->long) {
            $c1 = sprintf('-%s, --%s', $opt->short, $opt->long);
        } else if ($opt->short) {
            $c1 = sprintf('-%s', $opt->short);
        } else if ($opt->long) {
            $c1 = sprintf('--%s', $opt->long);
        }
        $c1 .= $opt->renderValueHint();

        return $c1;
    }