WIP Inline Entity Form support.

bibcite_footnotes.libraries.yml

@@ -3,3 +3,6 @@ reference_footnote:
   css:
     theme:
       css/reference_footnote.css: {}
+  dependencies:
+    - core/jquery
+    - core/drupalSettings

bibcite_footnotes.module

@@ -11,6 +11,9 @@ use Drupal\Core\Url;
 use Drupal\Core\Link;
 use Drupal\bibcite_footnotes\CitationTools;
 use Drupal\bibcite_footnotes\Plugin\Filter\ReferenceFootnotesFilter;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\core\Ajax\SettingsCommand;
+
 
 /**
  * Implements hook_theme().
@@ -207,3 +210,57 @@ function bibcite_footnotes_preprocess_bibcite_footnote_link(&$variables) {
   $variables['fn']['fn'] = $link;
 //  $variables['fn']['fn'][] = $link;
 }
+
+
+function bibcite_footnotes_form_node_form_alter(&$form, FormStateInterface &$form_state) {
+  $ief = $form_state->get('inline_entity_form');
+  if ($ief) {
+    $serializer = \Drupal::service('serializer');
+    // Inline entity storage uses hashes to separate out the field instances.
+    $bibcite_references = [];
+    foreach ($ief as $ief_instance) {
+      /**
+       * @var FieldConfig $field_config
+       */
+      $field_config = $ief_instance['instance'];
+
+      // Check if this is a bibcite_reference field type.
+      if ($field_config->getSetting('handler') == 'default:bibcite_reference') {
+        $field_name = $field_config->get('field_name');
+        if (!empty($ief_instance['entities'])) {
+
+          foreach ($ief_instance['entities'] as $entity_wrapper) {
+            /**
+             * @var \Drupal\core\Entity\EntityInterface $entity
+             */
+            $entity = $entity_wrapper['entity'];
+            if ($entity->getEntityTypeId() == 'bibcite_reference') {
+              $data = $serializer->normalize($entity, 'csl');
+              $build = ['#theme' => 'bibcite_citation', '#data' => $data];
+              $citation_text = trim(strip_tags(render($build)));
+              $citation_hash = md5(implode($data));
+              // Attempt to match up pre-saved entities with the eventual saved ones.
+              $bibcite_references[$field_name][] = ['hash' => $citation_hash, 'citation' => $citation_text];
+            }
+          }
+        }
+      }
+    }
+
+    $triggering_element = $form_state->getTriggeringElement();
+    if (!$triggering_element) {
+      $form[]['#attached']['library'][] = 'bibcite_footnotes/reference_footnote';
+      $form['#attached']['drupalSettings']['bibcite_footnotes']['references'] = $bibcite_references;
+    }
+    else {
+      $data = $bibcite_references;
+      $form[$triggering_element['#parents'][0]]['widget']['#attached']['drupalSettings']['bibcite_footnotes']['references'] = $data;
+      //$response = $form_state->getResponse();
+      //if (!empty($response)) {
+      //  $response->addCommand(new SettingsCommand ($data, TRUE));
+      //}
+
+    }
+  }
+}
+