dyh_ChtGptDrplMrkDwnLnkFltr

By Misc_Admin, 22 December, 2025

Clarifications: This is about ChatGpt assisted creation of Drupal's 'Markdown Link Filter'
ChatGPT Direction
Folder/file structure

  • folder structure: DrupalSiteRoot/modules/modules/custom/PrjctNm/src/Plugin/Filter
  • files
    • DrupalSiteRoot/modules/modules/custom/PrjctNm/mrk_dwn_lnk_fltr.info.yml
      • module/project description file
      name: 'mrk_dwn_lnk_fltr'
type: module
description: 'Converts Markdown links to wiki creation links for missing pages.'
core_version_requirement: ^8 || ^9 || ^10
package: Custom
dependencies:
- filter
    • DrupalSiteRoot/modules/modules/custom/PrjctNm/src/Plugin/Filter/mrk_dwn_lnk_fltr.php
      • the code/implementation
      // simple worked version
<?php

namespace Drupal\mrk_dwn_lnk_fltr\Plugin\Filter;

use Drupal\filter\FilterProcessResult;
use Drupal\filter\Plugin\FilterBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\filter\Annotation\Filter;

/**
 * @Filter(
 *   id = "mrk_dwn_lnk_fltr",
 *   title = @Translation("MarkDown Link Filter"),
 *   description = @Translation("Convert Markdown links to wiki creation links if the node does not exist."),
 *   type = Drupal\filter\Plugin\FilterInterface::TYPE_MARKUP_LANGUAGE,
 * )
 */
class mrk_dwn_lnk_fltr extends FilterBase {

  /**
   * {@inheritdoc}
   */
  public function process($text, $langcode) {
    $result = $text;

    // Regex to match Markdown links: [Text](Title)
    $pattern = '/\[(.*?)\]\((.*?)\)/';

    \Drupal::logger('me')->debug('before user call');
    $user = \Drupal::currentUser();
    \Drupal::logger('me')->debug('after user call');
    \Drupal::logger('me')->notice('Current user: uid=@uid name=@name roles=@roles', [
      '@uid' => $user->id(),
      '@name' => $user->getDisplayName(),
      '@roles' => implode(', ', $user->getRoles()),
    ]);

    $content_type = 'wiki'; // adjust as needed

    $result = 'user|'.$content_type.'|'.$result;

    $result0 = preg_replace_callback($pattern, function($matches) use ($user, $content_type) {
      $link_text = $matches[1];
      $link_target = $matches[2];

      \Drupal::logger('me')->debug('CntntTyp='.$content_type);
      \Drupal::logger('me')->debug('LnkTxt='.$link_text);
      \Drupal::logger('me')->debug('LnkTrgtp='.$link_target);

      // Check if node with title exists
      $query = \Drupal::entityTypeManager()->getStorage('node')->getQuery()
        ->accessCheck(FALSE)  // do not check permission
        ->condition('title', $link_target)  // query condition
        ->condition('type', $content_type)  //   :
        ->range(0, 1);                      // first 0 or 1 record 
      $nids = $query->execute();  // obtain node id info
      \Drupal::logger('me')->debug('nids='.var_dump($nids));

      if (!empty($nids)) {
        // Node exists, return normal link
        return $matches[0];
      } else {
        // Node does not exist. Check if user can create
        $node_access = \Drupal::entityTypeManager()->getStorage('node')->create(['type' => $content_type]);
        if ($user->hasPermission('create ' . $content_type . ' content')) {
          // Return Markdown link to node/add page + emoji
          $create_url = '/node/add/' . $content_type . '?edit[title]=' . urlencode($link_target);
          return '[' . $link_text . '](' . $create_url . ') ✨';
        }
        else {
          // Node does not exist, user cannot create: just return normal text
          return $link_text;
        }
      }
    }, $text);
    \Drupal::logger('me')->debug($result0);
    return new FilterProcessResult($result0);
  }
}
      • see also C:\_DH\_Prsnl\_Cds\_ClPhp\_DrplRltd\WikiFltr\wikiFltr.php

Enable module

  • -Admin -Extend -List -custom -mrk_dwn_lnk_fltr = x
  • -Install

Configure

  • -Admin -Configuration -Content authoring -Text formats and editors -select format(e.g. Markdown)
  • -Enabled filter -MarkDown Link Filter = x
  • -set Filter processing order = move 'MarkDown Link Filter' to top
  • Save configuration