syntax.php

<?php
/**
 * DokuWiki Plugin filelisting (Syntax Component)
 *
 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
 * @author  Szymon Olewniczak <dokuwiki@cosmocode.de>
 */

// must be run within Dokuwiki
if (!defined('DOKU_INC')) die();

class syntax_plugin_filelisting extends DokuWiki_Syntax_Plugin {
    /**
     * @return string Syntax mode type
     */
    public function getType() {
        return 'substition';
    }
    /**
     * @return string Paragraph type
     */
    public function getPType() {
        return 'block';
    }
    /**
     * @return int Sort order - Low numbers go before high numbers
     */
    public function getSort() {
        return 13;
    }

    /**
     * Connect lookup pattern to lexer.
     *
     * @param string $mode Parser mode
     */
    public function connectTo($mode) {
        $this->Lexer->addSpecialPattern('{{filelisting>?.*?}}',$mode,'plugin_filelisting');
    }

    /**
     * Handle matches of the filelisting syntax
     *
     * @param string          $match   The match of the syntax
     * @param int             $state   The state of the handler
     * @param int             $pos     The position in the document
     * @param Doku_Handler    $handler The handler
     * @return array Data for the renderer
     */
    public function handle($match, $state, $pos, Doku_Handler $handler){
        $param = substr($match, strlen('{{filelisting'), -strlen('}}'));
        //remove '>' from the path
        if(strlen($param) !== 0) $ns = substr($param, 1);

        return array($ns);
    }

    /**
     * Render xhtml output or metadata
     *
     * @param string         $mode      Renderer mode (supported modes: xhtml)
     * @param Doku_Renderer  $renderer  The renderer
     * @param array          $data      The data from the handler() function
     * @return bool If rendering was successful.
     */
    public function render($mode, Doku_Renderer $renderer, $data) {
        global $conf;
        global $INFO;

        $cur_ns = getNS($INFO['id']);

        list($ns) = $data;
        if(empty($ns)) {
            $ns = $cur_ns;
        } else {
            $ns = resolve_id($cur_ns, $ns);
        }


        if ($mode == 'metadata') {
            $dir = str_replace(':','/',$ns);
            $root = $conf['mediadir'].'/'.utf8_encodeFN($dir);

            $paths = array($root);

            if (file_exists($root)) {
                //get the ns and all its subfolders
                //https://stackoverflow.com/questions/14304935/php-listing-all-directories-and-sub-directories-recursively-in-drop-down-menu
                $iter = new RecursiveIteratorIterator(
                    new RecursiveDirectoryIterator($root, RecursiveDirectoryIterator::SKIP_DOTS),
                    RecursiveIteratorIterator::SELF_FIRST,
                    RecursiveIteratorIterator::CATCH_GET_CHILD // Ignore "Permission denied"
                );

                foreach ($iter as $path => $dir) {
                    if ($dir->isDir()) {
                        $paths[] = $path;
                    }
                }
            }

            $renderer->meta['filelisting'] = $paths;

            return true;
        } elseif ($mode == 'xhtml') {


            /** @var helper_plugin_filelisting $hlp */
            $hlp = plugin_load('helper', 'filelisting');

            $renderer->doc .= $hlp->tpl_filelisting(false, $ns);

            return true;
        }
        return false;
    }
}

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