function getHelpArgs($command)
    {
        if (isset($this->commands[$command]['options']) &&
            count($this->commands[$command]['options']))
        {
            $help = "Options:\n";
            foreach ($this->commands[$command]['options'] as $k => $v) {
                if (isset($v['arg'])) {
                    if ($v['arg'][0] == '(') {
                        $arg = substr($v['arg'], 1, -1);
                        $sapp = " [$arg]";
                        $lapp = "[=$arg]";
                    } else {
                        $sapp = " $v[arg]";
                        $lapp = "=$v[arg]";
                    }
                } else {
                    $sapp = $lapp = "";
                }

                if (isset($v['shortopt'])) {
                    $s = $v['shortopt'];
                    $help .= "  -$s$sapp, --$k$lapp\n";
                } else {
                    $help .= "  --$k$lapp\n";
                }

                $p = "        ";
                $doc = rtrim(str_replace("\n", "\n$p", $v['doc']));
                $help .= "        $doc\n";
            }

            return $help;
        }

        return null;
    }