diff --git a/src/applications/diffusion/typeahead/DiffusionRepositoryDatasource.php b/src/applications/diffusion/typeahead/DiffusionRepositoryDatasource.php
--- a/src/applications/diffusion/typeahead/DiffusionRepositoryDatasource.php
+++ b/src/applications/diffusion/typeahead/DiffusionRepositoryDatasource.php
@@ -15,11 +15,12 @@
     $viewer = $this->getViewer();
     $raw_query = $this->getRawQuery();
 
-    $results = array();
+    $query = id(new PhabricatorRepositoryQuery())
+      ->setOrder('name')
+      ->withDatasourceQuery($raw_query);
+    $repos = $this->executeQuery($query);
 
-    $repos = id(new PhabricatorRepositoryQuery())
-      ->setViewer($viewer)
-      ->execute();
+    $results = array();
     foreach ($repos as $repo) {
       $results[] = id(new PhabricatorTypeaheadResult())
         ->setName($repo->getMonogram().' '.$repo->getName())
diff --git a/src/applications/repository/query/PhabricatorRepositoryQuery.php b/src/applications/repository/query/PhabricatorRepositoryQuery.php
--- a/src/applications/repository/query/PhabricatorRepositoryQuery.php
+++ b/src/applications/repository/query/PhabricatorRepositoryQuery.php
@@ -11,6 +11,7 @@
   private $nameContains;
   private $remoteURIs;
   private $anyProjectPHIDs;
+  private $datasourceQuery;
 
   private $numericIdentifiers;
   private $callsignIdentifiers;
@@ -103,6 +104,11 @@
     return $this;
   }
 
+  public function withDatasourceQuery($query) {
+    $this->datasourceQuery = $query;
+    return $this;
+  }
+
   public function needCommitCounts($need_counts) {
     $this->needCommitCounts = $need_counts;
     return $this;
@@ -493,6 +499,21 @@
         $this->anyProjectPHIDs);
     }
 
+    if (strlen($this->datasourceQuery)) {
+      // This handles having "rP" match callsigns starting with "P...".
+      $query = trim($this->datasourceQuery);
+      if (preg_match('/^r/', $query)) {
+        $callsign = substr($query, 1);
+      } else {
+        $callsign = $query;
+      }
+      $where[] = qsprintf(
+        $conn_r,
+        'r.name LIKE %> OR r.callsign LIKE %>',
+        $query,
+        $callsign);
+    }
+
     $where[] = $this->buildPagingClause($conn_r);
 
     return $this->formatWhereClause($where);