Support limiting maniphest queries to specific ids

Summary:
This limits a maniphest task query to only contain certain ids set
by the tasks query parameter.

Test Plan:
none yet, i wrote this at a computer with no phabricator
install while bored and eating dinner.

Reviewers: skrul, epriestley

Reviewed By: epriestley

CC: aran, davidreuss, epriestley, skrul

Differential Revision: 1137

src/applications/maniphest/query/ManiphestTaskQuery.php

@@ -24,6 +24,7 @@
  */
 final class ManiphestTaskQuery {
 
+  private $taskIDs          = array();
   private $authorPHIDs      = array();
   private $ownerPHIDs       = array();
   private $includeUnowned   = null;
@@ -63,6 +64,11 @@ final class ManiphestTaskQuery {
     return $this;
   }
 
+  public function withTaskIDs(array $ids) {
+    $this->taskIDs = $ids;
+    return $this;
+  }
+
   public function withOwners(array $owners) {
     $this->includeUnowned = false;
     foreach ($owners as $k => $phid) {
@@ -147,6 +153,7 @@ final class ManiphestTaskQuery {
     }
 
     $where = array();
+    $where[] = $this->buildTaskIDsWhereClause($conn);
     $where[] = $this->buildStatusWhereClause($conn);
     $where[] = $this->buildPriorityWhereClause($conn);
     $where[] = $this->buildAuthorWhereClause($conn);
@@ -227,6 +234,17 @@ final class ManiphestTaskQuery {
     return $task_dao->loadAllFromArray($data);
   }
 
+  private function buildTaskIDsWhereClause($conn) {
+    if (!$this->taskIDs) {
+      return null;
+    }
+
+    return qsprintf(
+      $conn,
+      'id in (%Ld)',
+      $this->taskIDs);
+  }
+
   private function buildStatusWhereClause($conn) {
     switch ($this->status) {
       case self::STATUS_ANY: