Add a "Published document changed" rule to Herald for Phriction documents

Summary: Depends on D20519. Ref T13283. See PHI1202. Add a new rule which triggers when the current/most-recent transaction group includes a "content" or "publish" transaction, which means the published document content has changed.

Test Plan:
- Wrote a Herald rule using this field.
- Created a document (rule matched).
- Edited a document (rule matched).
- Edited a document, saving as a draft (no match).
- Edited a draft, updating it (no match).
- Published a draft docuemnt (rule matched).

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13283

Differential Revision: https://secure.phabricator.com/D20520

src/__phutil_library_map__.php

···
     'HeraldTextFieldValue' => 'applications/herald/value/HeraldTextFieldValue.php',
     'HeraldTokenizerFieldValue' => 'applications/herald/value/HeraldTokenizerFieldValue.php',
     'HeraldTransactionQuery' => 'applications/herald/query/HeraldTransactionQuery.php',
+    'HeraldTransactionsFieldGroup' => 'applications/herald/field/HeraldTransactionsFieldGroup.php',
     'HeraldTranscript' => 'applications/herald/storage/transcript/HeraldTranscript.php',
     'HeraldTranscriptController' => 'applications/herald/controller/HeraldTranscriptController.php',
     'HeraldTranscriptDestructionEngineExtension' => 'applications/herald/engineextension/HeraldTranscriptDestructionEngineExtension.php',
···
     'PhrictionDocumentPathHeraldField' => 'applications/phriction/herald/PhrictionDocumentPathHeraldField.php',
     'PhrictionDocumentPolicyCodex' => 'applications/phriction/codex/PhrictionDocumentPolicyCodex.php',
     'PhrictionDocumentPublishTransaction' => 'applications/phriction/xaction/PhrictionDocumentPublishTransaction.php',
+    'PhrictionDocumentPublishedHeraldField' => 'applications/phriction/herald/PhrictionDocumentPublishedHeraldField.php',
     'PhrictionDocumentQuery' => 'applications/phriction/query/PhrictionDocumentQuery.php',
     'PhrictionDocumentSearchConduitAPIMethod' => 'applications/phriction/conduit/PhrictionDocumentSearchConduitAPIMethod.php',
     'PhrictionDocumentSearchEngine' => 'applications/phriction/query/PhrictionDocumentSearchEngine.php',
···
     'HeraldTextFieldValue' => 'HeraldFieldValue',
     'HeraldTokenizerFieldValue' => 'HeraldFieldValue',
     'HeraldTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
+    'HeraldTransactionsFieldGroup' => 'HeraldFieldGroup',
     'HeraldTranscript' => array(
       'HeraldDAO',
       'PhabricatorPolicyInterface',
···
     'PhrictionDocumentPathHeraldField' => 'PhrictionDocumentHeraldField',
     'PhrictionDocumentPolicyCodex' => 'PhabricatorPolicyCodex',
     'PhrictionDocumentPublishTransaction' => 'PhrictionDocumentTransactionType',
+    'PhrictionDocumentPublishedHeraldField' => 'PhrictionDocumentHeraldField',
     'PhrictionDocumentQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
     'PhrictionDocumentSearchConduitAPIMethod' => 'PhabricatorSearchEngineAPIMethod',
     'PhrictionDocumentSearchEngine' => 'PhabricatorApplicationSearchEngine',

src/applications/herald/field/HeraldField.php

···
       ->execute();
   }
 
+  final protected function hasAppliedTransactionOfType($type) {
+    $xactions = $this->getAdapter()->getAppliedTransactions();
+
+    if (!$xactions) {
+      return false;
+    }
+
+    foreach ($xactions as $xaction) {
+      if ($xaction->getTransactionType() === $type) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+
 }

src/applications/herald/field/HeraldTransactionsFieldGroup.php

···
+<?php
+
+final class HeraldTransactionsFieldGroup extends HeraldFieldGroup {
+
+  const FIELDGROUPKEY = 'transactions';
+
+  public function getGroupLabel() {
+    return pht('Transactions');
+  }
+
+  protected function getGroupOrder() {
+    return 2000;
+  }
+
+}

src/applications/phriction/herald/PhrictionDocumentPublishedHeraldField.php

···
+<?php
+
+final class PhrictionDocumentPublishedHeraldField
+  extends PhrictionDocumentHeraldField {
+
+  const FIELDCONST = 'phriction.document.published';
+
+  public function getHeraldFieldName() {
+    return pht('Published document changed');
+  }
+
+  public function getFieldGroupKey() {
+    return HeraldTransactionsFieldGroup::FIELDGROUPKEY;
+  }
+
+  public function getHeraldFieldValue($object) {
+    // The published document changes if we apply a "publish" transaction
+    // (which points the published document pointer at new content) or if we
+    // apply a "content" transaction.
+
+    // When a change affects only the draft document, it applies as a "draft"
+    // transaction.
+
+    $type_content = PhrictionDocumentContentTransaction::TRANSACTIONTYPE;
+    $type_publish = PhrictionDocumentPublishTransaction::TRANSACTIONTYPE;
+
+    if ($this->hasAppliedTransactionOfType($type_content)) {
+      return true;
+    }
+
+    if ($this->hasAppliedTransactionOfType($type_publish)) {
+      return true;
+    }
+
+    return false;
+  }
+
+  protected function getHeraldFieldStandardType() {
+    return self::STANDARD_BOOL;
+  }
+
+}