Include widgets.js on blog posts that need it

Fixes #78

web/themes/custom/opdavies/opdavies.libraries.yml

@@ -2,6 +2,16 @@ global-styling:
   css:
     base:
       dist/tailwind.css: {}
+
 global-scripts:
   js:
     dist/js/app.js: {}
+
+twitter:
+  js:
+    https://platform.twitter.com/widgets.js:
+      type: external
+      minified: true
+      attributes:
+        async: true
+        charset: 'utf-8'

web/themes/custom/opdavies/opdavies.theme

@@ -5,6 +5,24 @@
  * Functions to support theming in the Tailwind CSS theme.
  */
 
+/**
+ * Implements hook_preprocess_HOOK().
+ */
+function opdavies_preprocess_page(array &$variables): void {
+  /** @var \Drupal\Core\Entity\EntityInterface $node */
+  if (!$node = \Drupal::routeMatch()->getParameter('node')) {
+    return;
+  }
+
+  if ($node->getType() != 'post') {
+    return;
+  }
+
+  if ($node->get('field_has_tweet')->getString()) {
+    $variables['#attached']['library'][] = 'opdavies/twitter';
+  }
+}
+
 /**
  * Implements hook_preprocess_HOOK().
  */