Add a breadcrumbs element

Summary:
Add a basic breadcrumbs element, and implement it in Paste.

This needs some polish but is most of the way there.

Test Plan:
{F26443}
{F26444}
{F26445}

(This element is not visible on devices.)

Reviewers: chad

Reviewed By: chad

CC: aran, btrahan

Maniphest Tasks: T1960

Differential Revision: https://secure.phabricator.com/D4087

src/applications/paste/controller/PhabricatorPasteController.php

@@ -2,37 +2,41 @@
 
 abstract class PhabricatorPasteController extends PhabricatorController {
 
-  public function buildSideNavView(PhabricatorPaste $paste = null) {
+  public function buildSideNavView($filter = null, $for_app = false) {
     $user = $this->getRequest()->getUser();
 
     $nav = new AphrontSideNavFilterView();
     $nav->setBaseURI(new PhutilURI($this->getApplicationURI('filter/')));
 
-    if ($paste) {
-      $nav->addFilter('paste', 'P'.$paste->getID(), '/P'.$paste->getID());
-      $nav->addSpacer();
+    if ($for_app) {
+      $nav->addFilter('', 'Create Paste', $this->getApplicationURI('/create/'));
     }
 
-    $nav->addLabel('Create');
-    $nav->addFilter(
-      'edit',
-      'New Paste',
-      $this->getApplicationURI(),
-      $relative = false,
-      $class = ($user->isLoggedIn() ? null : 'disabled'));
-
-    $nav->addSpacer();
-    $nav->addLabel('Pastes');
+    $nav->addLabel('Filters');
+    $nav->addFilter('all', 'All Pastes');
     if ($user->isLoggedIn()) {
       $nav->addFilter('my', 'My Pastes');
     }
-    $nav->addFilter('all', 'All Pastes');
+
+    $nav->selectFilter($filter, 'all');
 
     return $nav;
   }
 
   public function buildApplicationMenu() {
-    return $this->buildSideNavView(null)->getMenu();
+    return $this->buildSideNavView(null, true)->getMenu();
+  }
+
+  public function buildApplicationCrumbs() {
+    $crumbs = parent::buildApplicationCrumbs();
+
+    $crumbs->addAction(
+      id(new PhabricatorMenuItemView())
+        ->setName(pht('Create Paste'))
+        ->setHref($this->getApplicationURI('create/'))
+        ->setIcon('create'));
+
+    return $crumbs;
   }
 
 }