xm_drupal_manual.module

<?php

/**
 * Implements hook_theme().
 */
function xm_drupal_manual_theme($existing, $type, $theme, $path)
{
    $book_export_html = $existing['book_export_html'];
    $book_node_export_html = $existing['book_node_export_html'];
    $paragraph = $existing['paragraph'];
    $field__node__title__book = $existing['field__node__title'];

    $book_export_html['template'] = 'book-export-html--manual';
    unset($book_export_html['path']);

    $book_node_export_html['template'] = 'book-node-export-html--manual';
    unset($book_node_export_html['path']);

    $paragraph['template'] = 'paragraph--manual';
    unset($paragraph['path']);

    $field__node__title__book['template'] = 'field--node--title--book';
    unset($field__node__title__book['path']);

    return [
        'book_export_html__manual' => $book_export_html,
        'book_node_export_html__manual' => $book_node_export_html,
        'paragraph__manual' => $paragraph,
        'field__node__title__book' => $field__node__title__book,
    ];
}

/**
 * Implements hook_theme_suggestions_alter().
 */
function xm_drupal_manual_theme_suggestions_book_node_export_html_alter(array &$suggestions, array &$variables, $hook)
{
  $suggestions[] = 'book_node_export_html__manual';
}

/**
 * Implements hook_theme_suggestions_alter().
 */
function xm_drupal_manual_theme_suggestions_book_export_html_alter(array &$suggestions, array &$variables, $hook)
{
  $suggestions[] = 'book_export_html__manual';
}

/**
 * Implements hook_theme_suggestions_alter().
 */
function xm_drupal_manual_theme_suggestions_paragraph_alter(array &$suggestions, array &$variables, $hook)
{
    if(str_contains(\Drupal::service('path.current')->getPath(), 'book')) {
        $suggestions[] = 'paragraph__manual';
    }
}
/**
 * Implements hook_local_tasks_alter().
 */
function xm_drupal_manual_local_tasks_alter(&$local_tasks)
{
    // remove outline tab (Gliederung) for all nodes
    unset($local_tasks['entity.node.book_outline_form']);
}

/**
 * Implements hook_form_alter().
 */
function xm_drupal_manual_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id)
{
  // show book outline menu only in right tab
  if (!in_array($form_id, ['node_book_edit_form','node_book_form'], true)) {
    unset($form['book']);
  }
}

/**
 * Implements hook_preprocess_HOOK().
 */
function xm_drupal_manual_preprocess_book_export_html(&$variables)
{
    // path to module
    $variables['path'] = \Drupal::service('extension.list.module')->getPath('xm_drupal_manual');
}