Move into nested docroot

web/core/themes/bartik/bartik.theme

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+<?php
+
+/**
+ * @file
+ * Functions to support theming in the Bartik theme.
+ */
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Template\Attribute;
+
+/**
+ * Implements hook_preprocess_HOOK() for HTML document templates.
+ *
+ * Adds body classes if certain regions have content.
+ */
+function bartik_preprocess_html(&$variables) {
+  // Add information about the number of sidebars.
+  if (!empty($variables['page']['sidebar_first']) && !empty($variables['page']['sidebar_second'])) {
+    $variables['attributes']['class'][] = 'layout-two-sidebars';
+  }
+  elseif (!empty($variables['page']['sidebar_first'])) {
+    $variables['attributes']['class'][] = 'layout-one-sidebar';
+    $variables['attributes']['class'][] = 'layout-sidebar-first';
+  }
+  elseif (!empty($variables['page']['sidebar_second'])) {
+    $variables['attributes']['class'][] = 'layout-one-sidebar';
+    $variables['attributes']['class'][] = 'layout-sidebar-second';
+  }
+  else {
+    $variables['attributes']['class'][] = 'layout-no-sidebars';
+  }
+
+  if (!empty($variables['page']['featured_top'])) {
+    $variables['attributes']['class'][] = 'has-featured-top';
+  }
+
+}
+
+/**
+ * Implements hook_preprocess_HOOK() for page templates.
+ */
+function bartik_preprocess_page_title(&$variables) {
+  // Since the title and the shortcut link are both block level elements,
+  // positioning them next to each other is much simpler with a wrapper div.
+  if (!empty($variables['title_suffix']['add_or_remove_shortcut']) && $variables['title']) {
+    // Add a wrapper div using the title_prefix and title_suffix render
+    // elements.
+    $variables['title_prefix']['shortcut_wrapper'] = array(
+      '#markup' => '<div class="shortcut-wrapper clearfix">',
+      '#weight' => 100,
+    );
+    $variables['title_suffix']['shortcut_wrapper'] = array(
+      '#markup' => '</div>',
+      '#weight' => -99,
+    );
+    // Make sure the shortcut link is the first item in title_suffix.
+    $variables['title_suffix']['add_or_remove_shortcut']['#weight'] = -100;
+  }
+}
+
+/**
+ * Implements hook_preprocess_HOOK() for maintenance-page.html.twig.
+ */
+function bartik_preprocess_maintenance_page(&$variables) {
+  // By default, site_name is set to Drupal if no db connection is available
+  // or during site installation. Setting site_name to an empty string makes
+  // the site and update pages look cleaner.
+  // @see template_preprocess_maintenance_page
+  if (!$variables['db_is_active']) {
+    $variables['site_name'] = '';
+  }
+
+  // Bartik has custom styling for the maintenance page.
+  $variables['#attached']['library'][] = 'bartik/maintenance_page';
+}
+
+/**
+ * Implements hook_preprocess_HOOK() for node.html.twig.
+ */
+function bartik_preprocess_node(&$variables) {
+  // Remove the "Add new comment" link on teasers or when the comment form is
+  // displayed on the page.
+  if ($variables['teaser'] || !empty($variables['content']['comments']['comment_form'])) {
+    unset($variables['content']['links']['comment']['#links']['comment-add']);
+  }
+}
+
+/**
+ * Implements hook_preprocess_HOOK() for block.html.twig.
+ */
+function bartik_preprocess_block(&$variables) {
+  // Add a clearfix class to system branding blocks.
+  if ($variables['plugin_id'] == 'system_branding_block') {
+    $variables['attributes']['class'][] = 'clearfix';
+  }
+}
+
+/**
+ * Implements hook_preprocess_HOOK() for menu.html.twig.
+ */
+function bartik_preprocess_menu(&$variables) {
+  $variables['attributes']['class'][] = 'clearfix';
+}
+
+/**
+ * Implements hook_theme_suggestions_HOOK_alter() for form templates.
+ */
+function bartik_theme_suggestions_form_alter(array &$suggestions, array $variables) {
+  if ($variables['element']['#form_id'] == 'search_block_form') {
+    $suggestions[] = 'form__search_block_form';
+  }
+}
+
+/**
+ * Implements hook_form_alter() to add classes to the search form.
+ */
+function bartik_form_alter(&$form, FormStateInterface $form_state, $form_id) {
+  if (in_array($form_id, ['search_block_form', 'search_form'])) {
+    $key = ($form_id == 'search_block_form') ? 'actions' : 'basic';
+    if (!isset($form[$key]['submit']['#attributes'])) {
+      $form[$key]['submit']['#attributes'] = new Attribute();
+    }
+    $form[$key]['submit']['#attributes']->addClass('search-form__submit');
+  }
+}