Add a "Rule Detail" link to Herald email

Summary:
See PHI285. Ref T13130. After recent changes Herald sends email about rules, but the mail doesn't currently actually include a link to the rule.

Include a link for consistency and ease-of-use.

Test Plan: Edited a rule, looked at the resulting mail, saw a link to the rule.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13130

Differential Revision: https://secure.phabricator.com/D19413

src/applications/herald/editor/HeraldRuleEditor.php

@@ -137,4 +137,18 @@ final class HeraldRuleEditor
     return pht('[Herald]');
   }
 
+
+  protected function buildMailBody(
+    PhabricatorLiskDAO $object,
+    array $xactions) {
+
+    $body = parent::buildMailBody($object, $xactions);
+
+    $body->addLinkSection(
+      pht('RULE DETAIL'),
+      PhabricatorEnv::getProductionURI($object->getURI()));
+
+    return $body;
+  }
+
 }

src/applications/herald/storage/HeraldRule.php

@@ -254,6 +254,10 @@ final class HeraldRule extends HeraldDAO
     return 'H'.$this->getID();
   }
 
+  public function getURI() {
+    return '/'.$this->getMonogram();
+  }
+
 
 /* -(  Repetition Policies  )------------------------------------------------ */