Add a "tags" field to Diffusion commit

Summary:
  - Fixes T4588.
  - See D8501.
  - Adds a "Tags" field for Herald commit emails.
  - Fixes a bug in `tagsquery` when filtering by commit name.
  - Make `tagsquery` just return nothing instead of fataling against Mercurial/Subversion.

Test Plan: Used `bin/repository/reparse.php --herald` to exercise this code.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: aran, epriestley

Maniphest Tasks: T4588

Differential Revision: https://secure.phabricator.com/D8502

src/__phutil_library_map__.php

@@ -1283,6 +1283,7 @@ phutil_register_library_map(array(
     'PhabricatorChatLogQuery' => 'applications/chatlog/PhabricatorChatLogQuery.php',
     'PhabricatorCommitBranchesField' => 'applications/repository/customfield/PhabricatorCommitBranchesField.php',
     'PhabricatorCommitCustomField' => 'applications/repository/customfield/PhabricatorCommitCustomField.php',
+    'PhabricatorCommitTagsField' => 'applications/repository/customfield/PhabricatorCommitTagsField.php',
     'PhabricatorCommonPasswords' => 'applications/auth/constants/PhabricatorCommonPasswords.php',
     'PhabricatorConduitAPIController' => 'applications/conduit/controller/PhabricatorConduitAPIController.php',
     'PhabricatorConduitCertificateToken' => 'applications/conduit/storage/PhabricatorConduitCertificateToken.php',
@@ -3962,6 +3963,7 @@ phutil_register_library_map(array(
     'PhabricatorChatLogQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
     'PhabricatorCommitBranchesField' => 'PhabricatorCommitCustomField',
     'PhabricatorCommitCustomField' => 'PhabricatorCustomField',
+    'PhabricatorCommitTagsField' => 'PhabricatorCommitCustomField',
     'PhabricatorCommonPasswords' => 'Phobject',
     'PhabricatorConduitAPIController' => 'PhabricatorConduitController',
     'PhabricatorConduitCertificateToken' => 'PhabricatorConduitDAO',

src/applications/diffusion/conduit/ConduitAPI_diffusion_tagsquery_Method.php

@@ -1,8 +1,5 @@
 <?php
 
-/**
- * @group conduit
- */
 final class ConduitAPI_diffusion_tagsquery_Method
   extends ConduitAPI_diffusion_abstractquery_Method {
 
@@ -38,12 +35,14 @@ final class ConduitAPI_diffusion_tagsquery_Method
 
     $all_tags = $this->loadGitTagList();
     $all_tags = mpull($all_tags, null, 'getName');
+
     if ($name_filter !== null) {
       $all_tags = array_intersect_key($all_tags, array_fuse($name_filter));
     }
     if ($commit_filter !== null) {
-      $all_tags = array_intersect_key($all_tags, array_fuse($commit_filter));
+      $all_tags = array_intersect_key($all_tags, $commit_filter);
     }
+
     $tags = array_values($all_tags);
 
     $offset = $request->getValue('offset');
@@ -151,4 +150,14 @@ final class ConduitAPI_diffusion_tagsquery_Method
     return $tags;
   }
 
+  protected function getMercurialResult(ConduitAPIRequest $request) {
+    // For now, we don't support Mercurial tags via API.
+    return array();
+  }
+
+  protected function getSVNResult(ConduitAPIRequest $request) {
+    // Subversion has no meaningful concept of tags.
+    return array();
+  }
+
 }

src/applications/repository/customfield/PhabricatorCommitTagsField.php

@@ -0,0 +1,37 @@
+<?php
+
+final class PhabricatorCommitTagsField
+  extends PhabricatorCommitCustomField {
+
+  public function getFieldKey() {
+    return 'diffusion:tags';
+  }
+
+  public function shouldAppearInApplicationTransactions() {
+    return true;
+  }
+
+  public function buildApplicationTransactionMailBody(
+    PhabricatorApplicationTransaction $xaction,
+    PhabricatorMetaMTAMailBody $body) {
+
+    $params = array(
+      'commit' => $this->getObject()->getCommitIdentifier(),
+      'callsign' => $this->getObject()->getRepository()->getCallsign(),
+    );
+
+    $tags_raw = id(new ConduitCall('diffusion.tagsquery', $params))
+      ->setUser($this->getViewer())
+      ->execute();
+
+    $tags = DiffusionRepositoryTag::newFromConduit($tags_raw);
+    if (!$tags) {
+      return;
+    }
+    $tag_names = mpull($tags, 'getName');
+    sort($tag_names);
+
+    $body->addTextSection(pht('TAGS'), implode(', ', $tag_names));
+  }
+
+}

src/applications/repository/worker/PhabricatorRepositoryCommitHeraldWorker.php

@@ -167,9 +167,14 @@ final class PhabricatorRepositoryCommitHeraldWorker
       ->setViewer(PhabricatorUser::getOmnipotentUser())
       ->readFieldsFromStorage($commit);
     foreach ($field_list->getFields() as $field) {
-      $field->buildApplicationTransactionMailBody(
-        new DifferentialTransaction(), // Bogus object to satisfy typehint.
-        $body);
+      try {
+        $field->buildApplicationTransactionMailBody(
+          new DifferentialTransaction(), // Bogus object to satisfy typehint.
+          $body);
+      } catch (Exception $ex) {
+        // Log the exception and continue.
+        phlog($ex);
+      }
     }
 
     $body->addTextSection(pht('DIFFERENTIAL REVISION'), $differential);