postoffice-1.0.x-dev/extensions/postoffice_skel/postoffice_skel.module

<?php

/**
 * @file
 * Primary module hooks for Postoffice skel module.
 */

use Drupal\Core\Template\Attribute;
use Drupal\postoffice\Email\LocalizedEmailInterface;

/**
 * Implements hook_theme().
 */
function postoffice_skel_theme() {
  return [
    'postoffice_skel' => [
      'variables' => [
        'email' => NULL,
      ],
    ],
  ];
}

/**
 * Prepares variables for postoffice skeleton templates.
 *
 * Default template: postoffice-skel.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - email: The symfony mime email object.
 */
function template_preprocess_postoffice_skel(array &$variables) {
  $languageManager = \Drupal::languageManager();

  $email = $variables['email'];
  if (
    $email instanceof LocalizedEmailInterface &&
    $languageManager->getLanguage($email->getLangcode())
  ) {
    $language = $languageManager->getLanguage($email->getLangcode());
  }
  else {
    $language = $languageManager->getCurrentLanguage();
  }

  // HTML element attributes.
  $attributes = [];
  $attributes['lang'] = $language->getId();
  $attributes['dir'] = $language->getDirection();
  $variables['html_attributes'] = new Attribute($attributes);

  // Langcode.
  $variables['langcode'] = $language->getId();
}