token support -The token module is not aware of livre/ book 3.0.x or book 2.0.x

Problem/Motivation

Livre is based off of book 3.0.x and the token module which provides the book tokens is not aware of book 3.0.x. The token module assumes you're using book 1.0.x.

How to fix this? Well, here it goes:

Steps to reproduce

Proposed resolution

Add mymodule.token.inc to mymodule

use Drupal\Core\Render\BubbleableMetadata;
use Drupal\node\NodeInterface;

/**
 * Implements hook_token_info().
 */
function mymodule_token_info() {

  return [
    'types' => [
      'node' => [
        'name' => t('Node'),
        'description' => t('Node tokens extended for Livre/Book 3.x.'),
      ],
    ],
    'tokens' => [
      'node' => [
        'book:parents:join-path' => [
          'name' => t('Book parents joined as path'),
          'description' => t('Titles of ancestor book pages, joined as a path.'),
        ],
      ],
    ],
  ];
}

/**
 * Implements hook_tokens().
 */
function mymodule_tokens($type, $tokens, array $data, array $options, BubbleableMetadata $bubbleable_metadata) {

  $replacements = [];

  if ($type !== 'node' || empty($data['node']) || !$data['node'] instanceof NodeInterface) {
    return $replacements;
  }

  /** @var \Drupal\node\NodeInterface $node */
  $node = $data['node'];

  /** @var \Drupal\book\BookManagerInterface $book_manager */
  $book_manager = \Drupal::service('book.manager');

  // --- 1. Load book link for THIS node ---
  $book_link = $book_manager->loadBookLink($node->id());

  if (!$book_link) {
    return $replacements; // Not part of a book.
  }

  // --- 2. Load the parent link if pid > 0 ---
  $parent_link = [];
  if (!empty($book_link['pid'])) {
    $parent_link = $book_manager->loadBookLink($book_link['pid']) ?: [];
  }

  // --- 3. Get parent chain array ---
  // Returns array: ['depth'=>X, 'p1'=>nid, 'p2'=>nid, ...]
  $parents = $book_manager->getBookParents($book_link, $parent_link);

  $depth = $parents['depth'] ?? 0;

  // --- 4. Build clean path segments from ancestor titles ---
  $titles = [];
  if ($depth > 0) {
    $node_storage = \Drupal::entityTypeManager()->getStorage('node');
    $cleaner = \Drupal::service('pathauto.alias_cleaner');

    $current_nid = $node->id();

    for ($i = 1; $i <= $depth; $i++) {
      $key = 'p' . $i;

      if (!empty($parents[$key]) && $parents[$key] != $current_nid) {
        if ($parent = $node_storage->load($parents[$key])) {
          $titles[] = $cleaner->cleanString($parent->label());
        }
      }
    }
  }


  // The final joined path.
  $joined_path = implode('/', $titles);

  foreach ($tokens as $name => $original) {
    if ($name === 'book:parents:join-path') {
      $replacements[$original] = $joined_path;
    }
  }

  return $replacements;
}

Now with this implemented correctly, the following pathauto pattern is functional:
[node:book:parents:join-path]/[node:title]

Remaining tasks

Turn this into a patch/Merge request for book and test it.

User interface changes

The token should work as expected.

API changes

None