Support repository query by short name in Diffusion

Summary: See PHI432. Ref T13099. Short names never made it to the UI/API but seem stable now, so support them.

Test Plan: {F5465173}

Maniphest Tasks: T13099

Differential Revision: https://secure.phabricator.com/D19202

src/applications/repository/query/PhabricatorRepositorySearchEngine.php

@@ -24,6 +24,9 @@ final class PhabricatorRepositorySearchEngine
       id(new PhabricatorSearchStringListField())
         ->setLabel(pht('Callsigns'))
         ->setKey('callsigns'),
+      id(new PhabricatorSearchStringListField())
+        ->setLabel(pht('Short Names'))
+        ->setKey('shortNames'),
       id(new PhabricatorSearchSelectField())
         ->setLabel(pht('Status'))
         ->setKey('status')
@@ -51,6 +54,10 @@ final class PhabricatorRepositorySearchEngine
       $query->withCallsigns($map['callsigns']);
     }
 
+    if ($map['shortNames']) {
+      $query->withSlugs($map['shortNames']);
+    }
+
     if ($map['status']) {
       $status = idx($this->getStatusValues(), $map['status']);
       if ($status) {