topic_relations.module

<?php


require_once "src/TopicRelations.php";
use Drupal\topic_relations\TopicRelations;

// Implements hook_taxonomy_term_insert.
function topic_relations_taxonomy_term_insert($term) {
  $tr = new TopicRelations();
  $tr->onInsert($term);
}

// Implements hook_taxonomy_term_update.
function topic_relations_taxonomy_term_update($term) {
  $tr = new TopicRelations();
  $tr->onUpdate($term);
}

// Attaches css to the relevant pages so that the built-in taxonomy
// hierarchy functionality is not visible
function topic_relations_page_attachments(array &$attachments) {
  $attachments['#attached']['library'][] = 'topic_relations/relations';
}

// Causes our help text to generated before the standard taxonomy help.
// This allows us to use the sibling selector in the css to remove the
// standard help text.
function topic_relations_module_implements_alter(&$implementations, $hook) {
 if ($hook == 'help') {
    $implementations = array('topic_relations' => $implementations['topic_relations']) + $implementations;
  }
}

// Alters the help text so that it does not say the stuff
// relating to the built-in hierarchy functionality
function topic_relations_help($route_name, \Drupal\Core\Routing\RouteMatchInterface $route_match) {
  if  ($route_name == "entity.taxonomy_vocabulary.overview_form") {
    return "<p id='replacement_taxonomy_help'>The default functionality for arranging terms into a hierarchy has been overridden by the custom module 'Topic Relations'. </p>";
  }
}