ISTWCMS-4506: trying to get libraries api module working with mathjax

src/Plugin/CKEditorPlugin/MathJaxPlugin.php

@@ -4,6 +4,7 @@ namespace Drupal\uw_cfg_common\Plugin\CKEditorPlugin;
 
 use Drupal\ckeditor\CKEditorPluginBase;
 use Drupal\editor\Entity\Editor;
+use Drupal\Core\Asset\LibrariesDirectoryFileFinder;
 
 /**
  * Defines the "mathjax" plugin.
@@ -15,6 +16,38 @@ use Drupal\editor\Entity\Editor;
  */
 class MathJaxPlugin extends CKEditorPluginBase {
 
+  /**
+   * Library file finder.
+   *
+   * @var \Drupal\Core\Asset\LibrariesDirectoryFileFinder
+   */
+  protected $libFileFinder;
+
+  /**
+   * Constructs a BlockComponentRenderArray object.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin ID for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\Core\Asset\LibrariesDirectoryFileFinder $libFileFinder
+   *   The library file finder.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, LibrariesDirectoryFileFinder $libFileFinder) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->libFileFinder = $libFileFinder;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static($configuration, $plugin_id, $plugin_definition, $container->get('library.libraries_directory_file_finder'));
+  }
+
+
   /**
    * {@inheritdoc}
    */
@@ -47,10 +80,12 @@ class MathJaxPlugin extends CKEditorPluginBase {
    * {@inheritdoc}
    */
   public function getButtons() {
+    $lib = $this->libFileFinder->find('ckeditor-mathjax');
+    $path = \Drupal::service('file_system')->realpath($lib);
     return [
       'Mathjax' => [
         'label' => $this->t('Math'),
-        'image' => drupal_get_path('profile', 'uw_base_profile') . '/libraries/ckeditor-mathjax/icons/mathjax.png',
+        'image' => $path . '/icons/mathjax.png',
       ],
     ];
   }