mojs-1.0.0-beta2/mojs.module

<?php

/**
 * @file
 * Drupal`s integration with mo.js library.
 *
 * "mo.js" - Is a javascript motion graphics library that is a fast,
 * retina ready, modular and open source.
 *
 * GitHub:  https://github.com/mojs/mojs
 * Website: https://mojs.github.io/
 * license: MIT licensed
 *
 * Copyright (C) 2016-2023 @legomushroom
 */

use Drupal\Core\Installer\InstallerKernel;

/**
 * Check to make sure that mo.js library is installed.
 *
 * @return bool
 *   Flag indicating if the library is properly installed.
 */
function mojs_check_installed() {
  // Throw error if mo.js library file not found.
  /** @var Drupal\Core\Asset\LibraryDiscovery $library_discovery */
  $library_discovery = \Drupal::service('library.discovery');
  $library_exists = FALSE;
  $definition = $library_discovery->getLibraryByName('mojs', 'mo.js');

  // Check if $definition is an array before accessing its elements.
  if (is_array($definition) && isset($definition['js'][0]['data'])) {
    $library_exists = file_exists(DRUPAL_ROOT . '/' . $definition['js'][0]['data']);
  }

  return $library_exists;
}

/**
 * Implements hook_page_attachments().
 */
function mojs_page_attachments(array &$attachments) {
  // Don't add the Library during installation.
  if (InstallerKernel::installationAttempted()) {
    return;
  }

  // Check first MO.JS UI module is not installed and library not exists.
  $moduleHandler = \Drupal::service('module_handler');
  if (!$moduleHandler->moduleExists('mojs_ui')) {
    // Check if the mo.js library is installed, then load
    // from local otherwise it will be used from CDN.
    if (mojs_check_installed()) {
      $attachments['#attached']['library'][] = 'mojs/mo.js';
    }
    else {
      $attachments['#attached']['library'][] = 'mojs/mo.cdn';
    }
  }
}