Headers

islandora_fits.module

@@ -52,7 +52,7 @@ function islandora_fits_theme($existing, $type, $theme, $path) {
             'variables' => [
                 'title' => 'FITS data',
                 'link' => NULL,
-                'data' => [],
+                'output' => [],
             ],
         ],
     ];

src/Plugin/Field/FieldFormatter/FitsFormatter.php

@@ -136,12 +136,21 @@ class FitsFormatter extends FormatterBase {
                 }
             }
         }
+        $fieldsets = $variables['islandora_fits_fieldsets'];
+        $output = [];
+        foreach ($fieldsets as $title => $fieldset) {
+            $output[] = [
+                'title' => $title,
+                'data' => $fieldset,
+            ];
 
-        $renderable =  [
+        }
+
+        $renderable = [
             '#theme' => 'fits',
-            '#title'  => $this->t("FITS metadata"),
+            '#title' => $this->t("FITS metadata"),
             '#link' => $link,
-            '#data' => $variables['islandora_fits_fieldsets'],
+            '#output' => $output,
 
         ];
         return \Drupal::service('renderer')->render($renderable);

templates/fits.html.twig

@@ -1,5 +1,10 @@
 <h1>{{ title }}</h1>
 <p>{{ link }}</p>
-<div>{{ data }}</div>
 
+<div>
+    {% for entry in output %}
+        <h2> {{ entry.title }} </h2>
+        <div>{{ entry.data }}</div>
+    {% endfor %}
 
+</div>