Provide an alter hook for the area links generated by the Farm UI module.

modules/farm/farm_ui/farm_ui.api.php

@@ -242,6 +242,28 @@ function hook_farm_ui_actions() {
   return $actions;
 }
 
+/**
+ * Alter area link in area details created by Farm UI.
+ *
+ * @param $link
+ *   An array with keys for the link 'href' and 'title', which will be used
+ *   directly in the l() function.
+ * @param $entity_info
+ *   Information about the entity type that the link is being built for. This
+ *   will contain keys:
+ *     - entity_type: The entity type.
+ *     - bundle: The entity bundle.
+ *     - entity_ids: An array of entity IDs that are extracted from the entity
+ *       View results (which may be paged, in which case you only get the
+ *       first page).
+ */
+function hook_farm_area_link_alter(&$link, $entity_info) {
+  $link = array(
+    'title' => 'New title',
+    'href' => 'new-path',
+  );
+}
+
 /**
  * @}
  */

modules/farm/farm_ui/farm_ui.farm_area.inc

@@ -115,6 +115,21 @@ function farm_ui_area_links($id, $entity_type) {
         'href' => $path,
       );
 
+      // Build an array of entity IDs included in the View.
+      $entity_ids = array();
+      foreach ($view->result as $delta => $record) {
+        $entity_ids[] = $record->id;
+      }
+
+      // Allow other modules to modify the link. Pass in some additional info
+      // about the entities it represents.
+      $entity_info = array(
+        'entity_type' => $entity_type,
+        'bundle' => $bundle,
+        'entity_ids' => $entity_ids,
+      );
+      drupal_alter('farm_area_link', $link, $entity_info);
+
       // Add the link.
       $links[] = l($link['title'], $link['href']);
     }

modules/farm/farm_ui/farm_ui.module

@@ -21,6 +21,9 @@ function farm_ui_hook_info() {
   $hooks['farm_ui_actions'] = array(
     'group' => 'farm_ui',
   );
+  $hooks['farm_area_link_alter'] = array(
+    'group' => 'farm_area',
+  );
   return $hooks;
 }