book_bundle.module

<?php

/**
 * @file
 * Primary module hooks for Book Bundle module
 */

use Drupal\book_bundle\content\ContentManager;
use Drupal\Core\Render\Element;
use Drupal\user\UserInterface;

/**
 * Implements hook_theme().
 */
function book_bundle_theme()
{
  return [
    'book' => [
      'render element' => 'elements',
    ],
    'chapter' => [
      'render element' => 'elements',
    ],
    'chapters' => [
      'variables' => [
        'chapters' => []
      ],
    ],
  ];
}

/**
 * Prepares variables for book templates
 *
 * Default template: book.html.twig
 *
 * @param array $variables
 *   An associative array containing:
 *   - elements: An associative array containing the book information and any
 *     fields attached to the entity
 *   - attributes: HTML attributes for the containing element
 */
function template_preprocess_book(array &$variables)
{
  $variables['view_mode'] = $variables['elements']['#view_mode'];

  foreach (Element::children($variables['elements']) as $key) {
    $variables['content'][$key] = $variables['elements'][$key];
  }
}

/**
 * Prepares variables for chapter templates
 *
 * Default template: chapter.html.twig
 *
 * @param array $variables
 *   An associative array containing:
 *   - elements: An associative array containing the chapter information and any
 *     fields attached to the entity
 *   - attributes: HTML attributes for the containing element
 */
function template_preprocess_chapter(array &$variables)
{
  $variables['view_mode'] = $variables['elements']['#view_mode'];

  foreach (Element::children($variables['elements']) as $key) {
    $variables['content'][$key] = $variables['elements'][$key];
  }
}

/**
 * Implements hook_user_cancel()
 */
function book_bundle_user_cancel($edit, UserInterface $account, $method)
{
  $contentManager = \Drupal::classResolver(ContentManager::class);

  switch ($method) {
    case 'user_cancel_block_unpublish':
      $contentManager->deleteAllUserContent($account->id());
      break;

    case 'user_cancel_reassign':
      $contentManager->anonymizeAllUserContent($account->id());
      break;
  }
}

/**
 * Implements hook_ENTITY_TYPE_predelete() for user entities
 */
function book_bundle_user_predelete(UserInterface $account)
{
  $contentManager = \Drupal::classResolver(ContentManager::class);
  $contentManager->deleteAllUserContent($account->id());
}