Provide an "event" page for push logs, which shows details on all events in a given push

Summary:
Ref T4677. This shows a more detailed view of an entire "git push", "hg push", or "svn commit".

This is mostly to give push summary emails a reasonable, stable URI to link to for T4677.

Test Plan:
  - Pushed into SVN, Git and Mercurial.
  - Viewed partial and imported event records.

{F134864}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T4677

Differential Revision: https://secure.phabricator.com/D8616

src/applications/repository/query/PhabricatorRepositoryPushEventQuery.php

@@ -7,6 +7,7 @@ final class PhabricatorRepositoryPushEventQuery
   private $phids;
   private $repositoryPHIDs;
   private $pusherPHIDs;
+  private $needLogs;
 
   public function withIDs(array $ids) {
     $this->ids = $ids;
@@ -28,6 +29,11 @@ final class PhabricatorRepositoryPushEventQuery
     return $this;
   }
 
+  public function needLogs($need_logs) {
+    $this->needLogs = $need_logs;
+    return $this;
+  }
+
   protected function loadPage() {
     $table = new PhabricatorRepositoryPushEvent();
     $conn_r = $table->establishConnection('r');
@@ -63,6 +69,24 @@ final class PhabricatorRepositoryPushEventQuery
     return $events;
   }
 
+  public function didFilterPage(array $events) {
+    $phids = mpull($events, 'getPHID');
+
+    if ($this->needLogs) {
+      $logs = id(new PhabricatorRepositoryPushLogQuery())
+        ->setParentQuery($this)
+        ->setViewer($this->getViewer())
+        ->withPushEventPHIDs($phids)
+        ->execute();
+      $logs = mgroup($logs, 'getPushEventPHID');
+      foreach ($events as $key => $event) {
+        $event_logs = idx($logs, $event->getPHID(), array());
+        $event->attachLogs($event_logs);
+      }
+    }
+
+    return $events;
+  }
 
   private function buildWhereClause(AphrontDatabaseConnection $conn_r) {
     $where = array();