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/**
 * Implements hook_theme_registry_alter().
 */
function maintenance_theme_registry_alter(&$theme_registry) {
  // Abort if the maintenance_page hook is not defined in current theme.
  if (!isset($theme_registry['maintenance_page'])) {
    return;
  }

  // Prevent override during system update route (/update.php).

/**
 * Implements hook_theme_registry_alter().
 */
function messages_theme_registry_alter(&$theme_registry) {
  // Override the default status messages template.
  if (isset($theme_registry['status_messages'])) {
    $module_path = \Drupal::service('extension.list.module')->getPath('messages');
    $theme_registry['status_messages']['path'] = $module_path . '/templates/misc';
  }
}

/**
 * Implements hook_theme_registry_alter() for Views templates.
 */
function views_timeline_theme_registry_alter(array &$theme_registry) {
  $module_path = \Drupal::service('extension.list.module')->getPath('views_timeline');

  // Add a custom template for a specific view.
  $theme_registry['views_view__views_timeline'] = [
    'type' => 'module',
  // Custom template file.

/**
 * Implements hook_theme_registry_alter().
 */
function a11y_form_helpers_theme_registry_alter(&$theme_registry) {
  // Replace default theme form-element.html.twig template from core.
  if (strpos($theme_registry['form_element']['path'], 'core/') === 0) {
    $path = explode('/', $theme_registry['form_element']['path']);
    $module_path = \Drupal::service('extension.path.resolver')->getPath('module', 'a11y_form_helpers');

    if (file_exists($module_path . '/templates/' . $path[2])) {

/**
 * Implements hook_theme_registry_alter().
 */
function a12s_patterns_theme_registry_alter(&$theme_registry): void {
  $path = \Drupal::service('extension.list.module')->getPath('a12s_patterns');

  if ($element = &$theme_registry['patterns_overview_page']) {
    $element['theme path'] = $path;
    $element['path'] = $path . '/templates';
  }

 * Add extra variables to "menu" derived themes, to provide some suggestions.
 *
 * @see hook_theme_registry_alter()
 */
function a12s_theme_builder_theme_registry_alter(array &$themeRegistry): void {
  $path = \Drupal::service('extension.list.module')->getPath('a12s_theme_builder');

  if ($element = &$themeRegistry['menu']) {
    $element['theme path'] = $path;
    $element['path'] = $path . '/templates';
  }

/**
 * Implements hook_theme_registry_alter().
 *
 * Helps us alter some Search API status pages.
 */
function acquia_search_theme_registry_alter(&$theme_registry) {
  $module_handler = \Drupal::moduleHandler();
  $module_path = $module_handler->getModule('acquia_search')->getPath();

  $theme_registry['search_api_index']['variables']['acquia_search_info_box'] = NULL;
  $theme_registry['search_api_index']['path'] = $module_path . '/templates';

/**
 * Implements hook_theme_registry_alter().
 *
 * Helps us alter some Search API status pages.
 */
function acquia_search_solr_theme_registry_alter(&$theme_registry) {
  $module_handler = \Drupal::moduleHandler();
  $module_path = $module_handler->getModule('acquia_search_solr')->getPath();

  $theme_registry['search_api_index']['variables']['acquia_search_info_box'] = NULL;
  $theme_registry['search_api_index']['path'] = $module_path . '/templates';

/**
 * Preprocess variables for AT Layout Plugin templates.
 * This function is added in at_core_theme_registry_alter().
 *
 * @param $variables
 */
function at_core_preprocess_at_layout(&$variables) {
  $attributes = _at_core_layout_plugin_attributes($variables);
  if (isset($attributes['role'])) {

/**
 * Implements hook_theme_registry_alter().
 *
 * @param $theme_registry
 */
function at_core_theme_registry_alter(&$theme_registry) {
  $theme_hooks = LayoutDiscoveryPlugin::getThemeHooks();

  // Only add preprocess functions if entity exposes theme function, and this
  // layout is provided by at_core.
  if (!empty($theme_hooks)) {
    foreach ($theme_registry as $theme_hook => $info) {

/**
 * Implements hook_theme_registry_alter().
 *
 * Template overrides for local tasks.
 */
function admin_local_tasks_theme_registry_alter(&$theme_registry) {
  /** @var \Drupal\Core\Extension\ModuleExtensionList $extension */
  $extension = \Drupal::service('extension.list.module');
  $path = $extension->getPath('admin_local_tasks');

  if (isset($theme_registry['menu_local_tasks'])) {
    $theme_registry['menu_local_tasks']['path'] = $path . '/templates/navigation';

  /**
   * Implements hook_theme_registry_alter().
   *
   * This hook ensures that this module's preprocess function runs after that of
   * a theme. Doing this allows this module to override the CSS variables that
   * can possibly come from a theme.
   */
  #[Hook('theme_registry_alter')]

/**
 * Implements hook_theme_registry_alter().
 */
#[LegacyHook]
function altcolor_theme_registry_alter(&$theme_registry) {
  \Drupal::service(AltColorHooks::class)->themeRegistryAlter($theme_registry);
}

/**
 * Implements hook_preprocess().
 */

/**
 * Implements hook_theme_registry_alter().
 */
function alter_blocks_element_markup_theme_registry_alter(array &$theme_registry) {
  $path = \Drupal::service('extension.list.module')->getPath('alter_blocks_element_markup');
  $theme_registry['block']['path'] = $path . '/templates';
  \Drupal::logger('AlterBlocksElementMarkup')->notice(print_r($theme_registry['block'], true));
}

/**

/**
 * Implements hook_theme_registry_alter().
 *
 * We still want the image_theme to process the image, just output it
 * in a different template, and only when it used in an AMP component.
 * A theme could do this with just theme_suggestions_alter(), but if a module
 * provides an alternate template it won't be discovered automatically by the
 * theme system. Using theme_register_alter() we can force the theme system to

 * actually use directly, then it will be available for the suggestion.
 */
function amp_theme_registry_alter(&$theme_registry) {
  $theme_registry['amp_image_wrapper'] = $theme_registry['image'];
  $theme_registry['amp_image_wrapper']['template'] = 'amp-image-wrapper';
  $theme_registry['amp_image_wrapper']['path'] = \Drupal::service('extension.list.module')->getPath('amp') . '/templates';
}

/**

/**
 * Implements hook_theme_registry_alter().
 */
function append_file_info_theme_registry_alter(&$theme_registry) {
  foreach ($theme_registry['file_link']['preprocess functions'] as $key => $value) {
    if ($value == 'template_preprocess_file_link') {
      $theme_registry['file_link']['preprocess functions'][$key] = '_append_file_info_preprocess_file_link';
    }
  }
}

/**
 * Preprocess variables for AT Layout Plugin templates.
 * This function is added in at_core_theme_registry_alter().
 *
 * @param $variables
 */
function at_core_preprocess_at_layout(&$variables) {
  $attributes = _at_core_layout_plugin_attributes($variables);
  if (isset($attributes['role'])) {

/**
 * Implements hook_theme_registry_alter().
 *
 * @param $theme_registry
 */
function at_core_theme_registry_alter(&$theme_registry) {
  $theme_hooks = LayoutDiscoveryPlugin::getThemeHooks();

  // Only add preprocess functions if entity exposes theme function, and this
  // layout is provided by at_core.
  if (!empty($theme_hooks)) {
    foreach ($theme_registry as $theme_hook => $info) {

/**
 * Implements hook_theme_registry_alter().
 */
function audiofield_theme_registry_alter(&$theme_registry) {
  /*
   * By default, Drupal 8 does not include theme suggestions from inside the
   * module in which they were created, so we must add them manually here.
   */
  $path = \Drupal::service('extension.list.module')->getPath('audiofield');
  $audioplayer_templates = drupal_find_theme_templates($theme_registry, '.html.twig', $path);

/**
 * Implements hook_theme_registry_alter().
 */
function bee_theme_registry_alter(&$theme_registry) {
  $theme_registry['field__node__field_availability_hourly'] = [
    'template' => 'field-availability-hourly',
    'path' => \Drupal::service('extension.list.module')->getPath('bee') . '/templates',
    'render element' => 'element',
    'base hook' => 'field',
    'type' => 'module',