template suggestions for container templates in Drupal 8

Tue, Nov 20, 2018

The below, and possibly improved, is incorporated into the Template Suggest module now includes container template suggestions. An example of what it will provide for a view:

 FILE NAME SUGGESTIONS:
   * container--view--case-study--page-listing.html.twig
   * container--view--case-study.html.twig
   x container--view.html.twig
   * container--no-parent.html.twig
   * container.html.twig

/**
 * Implements hook_theme_suggestions_HOOK_alter() for container templates.
 *
 * Add suggestions, as by default none are provided.
 */
function twigsuggest_theme_suggestions_container_alter(array &$suggestions, array $variables)
{
  if ($variables['has_parent']) {
    $suggestions[] = 'container__has_parent';
  }
  else {
    $suggestions[] = 'container__no_parent';
  }

  $element = $variables['element'];

  if (isset($element['#type']) && $element['#type'] != 'container') {
    $suggestions[] = 'container__' . $element['#type'];
  }

  if (isset($element['#type']) && $element['#type'] == 'container' && isset($element['children
']['#type'])) {
    $suggestions[] = 'container__' . $element['children']['#type'];
  }

  if (isset($element['#type']) && $element['#type'] == 'view') {
    $suggestions[] = 'container__view__' . $element['#name'];
    $suggestions[] = 'container__view__' . $element['#name'] . '__' . $element['#display_id'];
  }

  return $suggestions;
}