Email paste link

Summary: Fixes T4878

Test Plan:
1. Go to paste
2. Add comment
3. Check that paste subsribers got paste link by email

See T4878 for more details.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T4878

Differential Revision: https://secure.phabricator.com/D8861

src/applications/paste/editor/PhabricatorPasteEditor.php

@@ -157,6 +157,19 @@ final class PhabricatorPasteEditor
       ->addHeader('Thread-Topic', "P{$id}");
   }
 
+  protected function buildMailBody(
+    PhabricatorLiskDAO $object,
+    array $xactions) {
+
+    $body = parent::buildMailBody($object, $xactions);
+
+    $body->addTextSection(
+      pht('PASTE DETAIL'),
+      PhabricatorEnv::getProductionURI('/P'.$object->getID()));
+
+    return $body;
+  }
+
   protected function shouldPublishFeedStory(
     PhabricatorLiskDAO $object,
     array $xactions) {