From abd6ee96467c37381bb22f87bd1ab2c6ebe78536 Mon Sep 17 00:00:00 2001
From: Paul Weidner <paul.weidner@gmail.com>
Date: Thu, 7 Sep 2023 16:16:15 -0700
Subject: [PATCH] Add hook_farm_ui_theme_field_group_items to collect field
 group mappings

---
 modules/core/ui/theme/farm_ui_theme.api.php | 21 +++++++++++++++++
 modules/core/ui/theme/farm_ui_theme.module  | 26 +++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/modules/core/ui/theme/farm_ui_theme.api.php b/modules/core/ui/theme/farm_ui_theme.api.php
index f94eddd13..c47ee4f9b 100644
--- a/modules/core/ui/theme/farm_ui_theme.api.php
+++ b/modules/core/ui/theme/farm_ui_theme.api.php
@@ -14,6 +14,27 @@
  * @{
  */
 
+/**
+ * Specify the field groups to place entity fields in.
+ *
+ * @param string $entity_type
+ *   The entity type.
+ * @param string $bundle
+ *   The bundle.
+ *
+ * @return string[]
+ *   An array keyed by field ID mapping to field group.
+ */
+function hook_farm_ui_theme_field_group_items(string $entity_type, string $bundle) {
+  if ($entity_type == 'asset' && $bundle == 'animal') {
+    return [
+      'nickname' => 'bundle',
+      'sex' => 'bundle',
+    ];
+  }
+  return [];
+}
+
 /**
  * Specify the regions that asset, log, and plan content items should be in.
  *
diff --git a/modules/core/ui/theme/farm_ui_theme.module b/modules/core/ui/theme/farm_ui_theme.module
index bd47c6b1b..2545ff450 100644
--- a/modules/core/ui/theme/farm_ui_theme.module
+++ b/modules/core/ui/theme/farm_ui_theme.module
@@ -6,6 +6,7 @@
  */
 
 use Drupal\Core\Block\BlockPluginInterface;
+use Drupal\Core\Entity\Display\EntityFormDisplayInterface;
 use Drupal\Core\Form\FormStateInterface;
 
 /**
@@ -52,6 +53,31 @@ function farm_ui_theme_theme_suggestions_menu_local_tasks(array $variables) {
   return ['menu_local_tasks__farm'];
 }
 
+/**
+ * Implements hook_entity_form_display_alter().
+ */
+function farm_ui_theme_entity_form_display_alter(EntityFormDisplayInterface $form_display, array $context) {
+
+  // Only alter farm entity types.
+  $entity_types = ['asset', 'log', 'plan'];
+  if (!in_array($context['entity_type'], $entity_types)) {
+    return;
+  }
+
+  // Ask modules for a list of field group items.
+  $field_map = \Drupal::moduleHandler()->invokeAll(
+    'farm_ui_theme_field_group_items',
+    [$context['entity_type'], $context['bundle']],
+  );
+
+  // Apply the field group mapping if not already specified on the form display.
+  foreach ($field_map as $field_id => $field_group) {
+    if (($renderer = $form_display->getRenderer($field_id)) && !$renderer->getThirdPartySetting('farm_ui_theme', 'field_group', FALSE)) {
+      $renderer->setThirdPartySetting('farm_ui_theme', 'field_group', $field_group);
+    }
+  }
+}
+
 /**
  * Implements hook_gin_content_form_routes().
  */