Working Hook .theme

 

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<?php

use Drupal\block\Entity\Block;

/**

 * @file

 * Functions to support theming in the hook theme.

 */

/**

 * Implements hook_preprocess_HOOK() for html.html.twig.

 */

function hook_preprocess_html(&$variables) {

  $variables['base_path'] = base_path();

  $current_path = \Drupal::service('path.current')->getPath();

  $internal_path = \Drupal::service('path_alias.manager')->getAliasByPath($current_path);

  // Assign it to body class 

  $variables['attributes']['class'][] = str_replace("/", "", $internal_path);

}

/**

 * Implements hook_theme_suggestions_HOOK_alter().

 */

function hook_theme_suggestions_alter(array &$suggestions, array $variables, $hook) {

  if ($hook == 'node_edit_form') {

    if ($node = \Drupal::routeMatch()->getParameter('node')) {

      $content_type = $node->bundle();

    } else {

      $current_path = \Drupal::service('path.current')->getPath();

      $path_args = explode('/', $current_path);

      $content_type = $path_args[3];

    }

    $suggestions[] = 'node_edit_form__' . $content_type;

  }

}

/**

 * Implements hook_preprocess_HOOK() for page.html.twig.

 */

function hook_preprocess_page(&$variables) {

   // If page is front, add to the $variables values for twig template

  if ($variables['is_front']) {

    $language = \Drupal::languageManager()->getCurrentLanguage()->getId();

    $query = \Drupal::entityQuery('node');

    $query->condition('status', 1);

    $query->condition('langcode', $language);

    $query->condition('type', ['home_page_slider','advertisement'], 'IN');

    $nids = $query->execute();

    $variables['home_page']['slides'] = array();

    $variables['home_page']['scroller'] = array();

    // get and set values from content type to variable

    foreach ($nids as $nid) {

      $node = \Drupal\node\Entity\Node::load($nid);

      $translation = $node->getTranslation($language);

      $type = $node->bundle();

      if($type == 'home_page_slider') {

        $text = $translation->body->value;

        $img = $node->get('field_image')->getValue();

        

        $file = Drupal\file\Entity\File::load($img[0]['target_id']);

        $img_src = $file->createFileUrl();

        $variables['home_page']['slides'][] = array(

          'text' => $text,

          'img_src' => $file->createFileUrl(),

        );

      }

      else

      {

        $text = $translation->body->value;

        $variables['home_page']['scroller'][] = array(

          'text' => $text,

        );

      }

     

    }

  }

  $current_path = \Drupal::service('path.current')->getPath();

  $internal_path = \Drupal::service('path_alias.manager')->getAliasByPath($current_path);

  if ($variables['is_front'] !== TRUE && $internal_path != "/awards" && $internal_path != '/organization-chart') {

    $variables['#attached']['library'][] = 'hook/page-library';

  }

}

/**

 * Implements hook_preprocess_HOOK() for node.html.twig.

 */

function hook_preprocess_node(&$variables) {

}

/**

 * Implements hook_preprocess_HOOK().

 *

 * Pass block region value to content so this can be used in

 * MYTHEME_theme_suggestions_menu_alter.

 */

function hook_preprocess_block(&$variables) {

  if (isset($variables['elements']['#id'])) {

    $region = Block::load($variables['elements']['#id'])->getRegion();

    $variables['content']['#attributes']['region'] = $region;

  }

}

/**

 * Implements hook_theme_suggestions_HOOK_alter().

 *

 * Provide region based menu suggestions.

 */

function hook_theme_suggestions_menu_alter(&$suggestions, array $variables) {

  if (isset($variables['attributes']['region'])) {

    $suggestion = 'menu__' . $variables['menu_name'] . '__' . $variables['attributes']['region'];

    $suggestion = str_replace('-', '_', $suggestion);

    $suggestions[] = $suggestion;

  }

}