Use ApplicationSearch in Feed

Summary: Ref T2625. This doesn't do anything fancy, but gives feed a little more flexibility.

Test Plan: Viewed `/feed/`.

Reviewers: btrahan, chad

Reviewed By: chad

CC: aran

Maniphest Tasks: T2625

Differential Revision: https://secure.phabricator.com/D6681

src/applications/feed/controller/PhabricatorFeedListController.php

@@ -0,0 +1,39 @@
+<?php
+
+final class PhabricatorFeedListController extends PhabricatorFeedController
+  implements PhabricatorApplicationSearchResultsControllerInterface {
+
+  private $queryKey;
+
+  public function shouldAllowPublic() {
+    return true;
+  }
+
+  public function willProcessRequest(array $data) {
+    $this->queryKey = idx($data, 'queryKey');
+  }
+
+  public function processRequest() {
+    $request = $this->getRequest();
+    $controller = id(new PhabricatorApplicationSearchController($request))
+      ->setQueryKey($this->queryKey)
+      ->setSearchEngine(new PhabricatorFeedSearchEngine())
+      ->setNavigation($this->buildSideNavView());
+
+    return $this->delegateToController($controller);
+  }
+
+  public function renderResultsList(
+    array $feed,
+    PhabricatorSavedQuery $query) {
+
+    $builder = new PhabricatorFeedBuilder($feed);
+    $builder->setUser($this->getRequest()->getUser());
+    $view = $builder->buildView();
+
+    return hsprintf(
+      '<div class="phabricator-feed-frame">%s</div>',
+      $view);
+  }
+
+}