Put Spaces on Hovercards and ObjectItemLists

Summary: Ref T8449.

Test Plan:
{F474186}

{F474187}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: chad, epriestley

Maniphest Tasks: T8449

Differential Revision: https://secure.phabricator.com/D13173

src/applications/spaces/query/PhabricatorSpacesNamespaceQuery.php

@@ -145,4 +145,33 @@ final class PhabricatorSpacesNamespaceQuery
     return $result;
   }
 
+  /**
+   * Get the Space PHID for an object, if one exists.
+   *
+   * This is intended to simplify performing a bunch of redundant checks; you
+   * can intentionally pass any value in (including `null`).
+   *
+   * @param wild
+   * @return phid|null
+   */
+  public static function getObjectSpacePHID($object) {
+    if (!$object) {
+      return null;
+    }
+
+    if (!($object instanceof PhabricatorSpacesInterface)) {
+      return null;
+    }
+
+    $space_phid = $object->getSpacePHID();
+    if ($space_phid === null) {
+      $default_space = self::getDefaultSpace();
+      if ($default_space) {
+        $space_phid = $default_space->getPHID();
+      }
+    }
+
+    return $space_phid;
+  }
+
 }

src/applications/spaces/view/PHUISpacesNamespaceContextView.php

@@ -0,0 +1,36 @@
+<?php
+
+final class PHUISpacesNamespaceContextView extends AphrontView {
+
+  private $object;
+
+  public function setObject($object) {
+    $this->object = $object;
+    return $this;
+  }
+
+  public function getObject() {
+    return $this->object;
+  }
+
+  public function render() {
+    $object = $this->getObject();
+
+    $space_phid = PhabricatorSpacesNamespaceQuery::getObjectSpacePHID($object);
+    if (!$space_phid) {
+      return null;
+    }
+
+    $viewer = $this->getUser();
+    return phutil_tag(
+      'span',
+      array(
+        'class' => 'spaces-name',
+      ),
+      array(
+        $viewer->renderHandle($space_phid),
+        ' | ',
+      ));
+  }
+
+}