From 67e4be9881bb974bcf41b21cb8ba804442ad5573 Mon Sep 17 00:00:00 2001
From: Jonathan Hunt <git@huntdesign.co.nz>
Date: Thu, 29 Apr 2021 12:04:37 +1200
Subject: [PATCH] Add formatter setting to suppress MARC Relator code in ()

---
 .../FieldFormatter/TypedRelationFormatter.php | 41 ++++++++++++++++++-
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/src/Plugin/Field/FieldFormatter/TypedRelationFormatter.php b/src/Plugin/Field/FieldFormatter/TypedRelationFormatter.php
index 2ebce91..c2e597e 100644
--- a/src/Plugin/Field/FieldFormatter/TypedRelationFormatter.php
+++ b/src/Plugin/Field/FieldFormatter/TypedRelationFormatter.php
@@ -4,6 +4,7 @@
 
 use Drupal\Core\Field\Plugin\Field\FieldFormatter\EntityReferenceLabelFormatter;
 use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Form\FormStateInterface;
 
 /**
  * Plugin implementation of the 'TypedRelationFormatter'.
@@ -18,6 +19,38 @@
  */
 class TypedRelationFormatter extends EntityReferenceLabelFormatter {
 
+  /**
+   * {@inheritdoc}
+   */
+  public static function defaultSettings() {
+    return [
+        'suppress_code' => FALSE,
+      ] + parent::defaultSettings();
+  }
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsForm(array $form, FormStateInterface $form_state) {
+
+    $elements = parent::settingsForm($form, $form_state);
+    $elements['suppress_code'] = [
+      '#title' => t('Hide code in () after label, if present'),
+      '#type' => 'checkbox',
+      '#default_value' => $this->getSetting('suppress_code'),
+    ];
+
+    return $elements;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsSummary() {
+    $summary = parent::settingsSummary();
+    $summary[] = $this->getSetting('suppress_code') ? t('Suppress code in (), if present') : t('Show code in (), if present');
+    return $summary;
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -28,9 +61,13 @@ public function viewElements(FieldItemListInterface $items, $langcode) {
 
       $rel_types = $item->getRelTypes();
       $rel_type = isset($rel_types[$item->rel_type]) ? $rel_types[$item->rel_type] : $item->rel_type;
-      if (!empty($rel_type)) {
-        $elements[$delta]['#prefix'] = $rel_type . ': ';
+
+      // Suppress code, e.g. change Author (aut) to Author.
+      if ($this->getSetting('suppress_code') == TRUE) {
+        $rel_type = preg_replace('/ \([^()]*\)/', '', $rel_type);
       }
+
+      $elements[$delta]['#prefix'] = $rel_type . ': ';
     }
 
     return $elements;