/**
 * 主题插件
 *
 * @package theme_plugin
 */
class theme_plugin{
    public static function markdown($text){
        require_once 'Parse.php'; //解析文件路径
        return Parsedown::instance()->setBreaksEnabled(true)->text($text);
    }
}

Typecho_Plugin::factory('Widget_Abstract_Contents')->markdown = ['theme_plugin', 'markdown'];
Typecho_Plugin::factory('Widget_Abstract_Comments')->markdown = ['theme_plugin', 'markdown'];