field_group_label_classes-8.x-1.2/field_group_label_classes.module

<?php

/**
 * @file
 * Extend HTML fieldgroup render with title class.
 */

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function field_group_label_classes_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.field_group_label_classes':
      $text = file_get_contents(dirname(__FILE__) . '/README.md');
      if (!\Drupal::moduleHandler()->moduleExists('markdown')) {
        return '<pre>' . $text . '</pre>';
      }
      else {
        // Use the Markdown filter to render the README.
        $filter_manager = \Drupal::service('plugin.manager.filter');
        $settings = \Drupal::configFactory()->get('markdown.settings')->getRawData();
        $config = ['settings' => $settings];
        $filter = $filter_manager->createInstance('markdown', $config);
        return $filter->process($text, 'en');
      }
  }
  return NULL;
}

/**
 * Implements hook_theme_registry_alter().
 */
function field_group_label_classes_theme_registry_alter(&$theme_registry) {
  $theme_registry['field_group_html_element']['path'] = drupal_get_path('module', 'field_group_label_classes') . '/templates';
}

/**
 * Implements hook_preprocess_HOOK().
 */
function field_group_label_classes_preprocess_field_group_html_element(&$variables) {
  $element = $variables['element'];
  $variables['title_classes'] = [];

  if (!empty($element['#title_classes'])) {
    $variables['title_classes'] = explode(' ', $element['#title_classes']);
  }

  if (!empty($element['#effect']) && $element['#effect'] !== 'none') {
    $variables['title_classes'][] = 'field-group-toggler';
  }
  $variables['title_classes'] = implode(' ', $variables['title_classes']);
}