Modularize PhabricatorEditEngineConfigurationTransaction

Summary: Ref T13319. Ref PHI1302. Migrate `PhabricatorEditEngineConfigurationTransaction` to modular transactions and add some additional transaction rendering to make these edits less opaque.

Test Plan: Hit all the form edit controllers, viewed resulting transaction timeline.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T13319

Differential Revision: https://secure.phabricator.com/D20595

src/__phutil_library_map__.php

@@ -2172,9 +2172,11 @@ phutil_register_library_map(array(
     'PhabricatorApplicationTransactionCommentView' => 'applications/transactions/view/PhabricatorApplicationTransactionCommentView.php',
     'PhabricatorApplicationTransactionController' => 'applications/transactions/controller/PhabricatorApplicationTransactionController.php',
     'PhabricatorApplicationTransactionDetailController' => 'applications/transactions/controller/PhabricatorApplicationTransactionDetailController.php',
+    'PhabricatorApplicationTransactionDetailView' => 'applications/transactions/view/PhabricatorApplicationTransactionDetailView.php',
     'PhabricatorApplicationTransactionEditor' => 'applications/transactions/editor/PhabricatorApplicationTransactionEditor.php',
     'PhabricatorApplicationTransactionFeedStory' => 'applications/transactions/feed/PhabricatorApplicationTransactionFeedStory.php',
     'PhabricatorApplicationTransactionInterface' => 'applications/transactions/interface/PhabricatorApplicationTransactionInterface.php',
+    'PhabricatorApplicationTransactionJSONDiffDetailView' => 'applications/transactions/view/PhabricatorApplicationTransactionJSONDiffDetailView.php',
     'PhabricatorApplicationTransactionNoEffectException' => 'applications/transactions/exception/PhabricatorApplicationTransactionNoEffectException.php',
     'PhabricatorApplicationTransactionNoEffectResponse' => 'applications/transactions/response/PhabricatorApplicationTransactionNoEffectResponse.php',
     'PhabricatorApplicationTransactionPublishWorker' => 'applications/transactions/worker/PhabricatorApplicationTransactionPublishWorker.php',
@@ -3151,16 +3153,26 @@ phutil_register_library_map(array(
     'PhabricatorEditEngineConfigurationTransactionQuery' => 'applications/transactions/query/PhabricatorEditEngineConfigurationTransactionQuery.php',
     'PhabricatorEditEngineConfigurationViewController' => 'applications/transactions/controller/PhabricatorEditEngineConfigurationViewController.php',
     'PhabricatorEditEngineController' => 'applications/transactions/controller/PhabricatorEditEngineController.php',
+    'PhabricatorEditEngineCreateOrderTransaction' => 'applications/transactions/xaction/PhabricatorEditEngineCreateOrderTransaction.php',
     'PhabricatorEditEngineDatasource' => 'applications/transactions/typeahead/PhabricatorEditEngineDatasource.php',
+    'PhabricatorEditEngineDefaultCreateTransaction' => 'applications/transactions/xaction/PhabricatorEditEngineDefaultCreateTransaction.php',
     'PhabricatorEditEngineDefaultLock' => 'applications/transactions/editengine/PhabricatorEditEngineDefaultLock.php',
+    'PhabricatorEditEngineDefaultTransaction' => 'applications/transactions/xaction/PhabricatorEditEngineDefaultTransaction.php',
+    'PhabricatorEditEngineDisableTransaction' => 'applications/transactions/xaction/PhabricatorEditEngineDisableTransaction.php',
+    'PhabricatorEditEngineEditOrderTransaction' => 'applications/transactions/xaction/PhabricatorEditEngineEditOrderTransaction.php',
     'PhabricatorEditEngineExtension' => 'applications/transactions/engineextension/PhabricatorEditEngineExtension.php',
     'PhabricatorEditEngineExtensionModule' => 'applications/transactions/engineextension/PhabricatorEditEngineExtensionModule.php',
+    'PhabricatorEditEngineIsEditTransaction' => 'applications/transactions/xaction/PhabricatorEditEngineIsEditTransaction.php',
     'PhabricatorEditEngineListController' => 'applications/transactions/controller/PhabricatorEditEngineListController.php',
     'PhabricatorEditEngineLock' => 'applications/transactions/editengine/PhabricatorEditEngineLock.php',
     'PhabricatorEditEngineLockableInterface' => 'applications/transactions/editengine/PhabricatorEditEngineLockableInterface.php',
+    'PhabricatorEditEngineLocksTransaction' => 'applications/transactions/xaction/PhabricatorEditEngineLocksTransaction.php',
     'PhabricatorEditEngineMFAEngine' => 'applications/transactions/editengine/PhabricatorEditEngineMFAEngine.php',
     'PhabricatorEditEngineMFAInterface' => 'applications/transactions/editengine/PhabricatorEditEngineMFAInterface.php',
+    'PhabricatorEditEngineNameTransaction' => 'applications/transactions/xaction/PhabricatorEditEngineNameTransaction.php',
+    'PhabricatorEditEngineOrderTransaction' => 'applications/transactions/xaction/PhabricatorEditEngineOrderTransaction.php',
     'PhabricatorEditEnginePointsCommentAction' => 'applications/transactions/commentaction/PhabricatorEditEnginePointsCommentAction.php',
+    'PhabricatorEditEnginePreambleTransaction' => 'applications/transactions/xaction/PhabricatorEditEnginePreambleTransaction.php',
     'PhabricatorEditEngineProfileMenuItem' => 'applications/search/menuitem/PhabricatorEditEngineProfileMenuItem.php',
     'PhabricatorEditEngineQuery' => 'applications/transactions/query/PhabricatorEditEngineQuery.php',
     'PhabricatorEditEngineSearchEngine' => 'applications/transactions/query/PhabricatorEditEngineSearchEngine.php',
@@ -3171,7 +3183,9 @@ phutil_register_library_map(array(
     'PhabricatorEditEngineSubtypeInterface' => 'applications/transactions/editengine/PhabricatorEditEngineSubtypeInterface.php',
     'PhabricatorEditEngineSubtypeMap' => 'applications/transactions/editengine/PhabricatorEditEngineSubtypeMap.php',
     'PhabricatorEditEngineSubtypeTestCase' => 'applications/transactions/editengine/__tests__/PhabricatorEditEngineSubtypeTestCase.php',
+    'PhabricatorEditEngineSubtypeTransaction' => 'applications/transactions/xaction/PhabricatorEditEngineSubtypeTransaction.php',
     'PhabricatorEditEngineTokenizerCommentAction' => 'applications/transactions/commentaction/PhabricatorEditEngineTokenizerCommentAction.php',
+    'PhabricatorEditEngineTransactionType' => 'applications/transactions/xaction/PhabricatorEditEngineTransactionType.php',
     'PhabricatorEditField' => 'applications/transactions/editfield/PhabricatorEditField.php',
     'PhabricatorEditPage' => 'applications/transactions/editengine/PhabricatorEditPage.php',
     'PhabricatorEditType' => 'applications/transactions/edittype/PhabricatorEditType.php',
@@ -8091,8 +8105,10 @@ phutil_register_library_map(array(
     'PhabricatorApplicationTransactionCommentView' => 'AphrontView',
     'PhabricatorApplicationTransactionController' => 'PhabricatorController',
     'PhabricatorApplicationTransactionDetailController' => 'PhabricatorApplicationTransactionController',
+    'PhabricatorApplicationTransactionDetailView' => 'AphrontView',
     'PhabricatorApplicationTransactionEditor' => 'PhabricatorEditor',
     'PhabricatorApplicationTransactionFeedStory' => 'PhabricatorFeedStory',
+    'PhabricatorApplicationTransactionJSONDiffDetailView' => 'PhabricatorApplicationTransactionDetailView',
     'PhabricatorApplicationTransactionNoEffectException' => 'Exception',
     'PhabricatorApplicationTransactionNoEffectResponse' => 'AphrontProxyResponse',
     'PhabricatorApplicationTransactionPublishWorker' => 'PhabricatorWorker',
@@ -8103,7 +8119,7 @@ phutil_register_library_map(array(
     'PhabricatorApplicationTransactionShowOlderController' => 'PhabricatorApplicationTransactionController',
     'PhabricatorApplicationTransactionStructureException' => 'Exception',
     'PhabricatorApplicationTransactionTemplatedCommentQuery' => 'PhabricatorApplicationTransactionCommentQuery',
-    'PhabricatorApplicationTransactionTextDiffDetailView' => 'AphrontView',
+    'PhabricatorApplicationTransactionTextDiffDetailView' => 'PhabricatorApplicationTransactionDetailView',
     'PhabricatorApplicationTransactionTransactionPHIDType' => 'PhabricatorPHIDType',
     'PhabricatorApplicationTransactionType' => 'PhabricatorModularTransactionType',
     'PhabricatorApplicationTransactionValidationError' => 'Phobject',
@@ -9228,18 +9244,28 @@ phutil_register_library_map(array(
     'PhabricatorEditEngineConfigurationSearchEngine' => 'PhabricatorApplicationSearchEngine',
     'PhabricatorEditEngineConfigurationSortController' => 'PhabricatorEditEngineController',
     'PhabricatorEditEngineConfigurationSubtypeController' => 'PhabricatorEditEngineController',
-    'PhabricatorEditEngineConfigurationTransaction' => 'PhabricatorApplicationTransaction',
+    'PhabricatorEditEngineConfigurationTransaction' => 'PhabricatorModularTransaction',
     'PhabricatorEditEngineConfigurationTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
     'PhabricatorEditEngineConfigurationViewController' => 'PhabricatorEditEngineController',
     'PhabricatorEditEngineController' => 'PhabricatorApplicationTransactionController',
+    'PhabricatorEditEngineCreateOrderTransaction' => 'PhabricatorEditEngineTransactionType',
     'PhabricatorEditEngineDatasource' => 'PhabricatorTypeaheadDatasource',
+    'PhabricatorEditEngineDefaultCreateTransaction' => 'PhabricatorEditEngineTransactionType',
     'PhabricatorEditEngineDefaultLock' => 'PhabricatorEditEngineLock',
+    'PhabricatorEditEngineDefaultTransaction' => 'PhabricatorEditEngineTransactionType',
+    'PhabricatorEditEngineDisableTransaction' => 'PhabricatorEditEngineTransactionType',
+    'PhabricatorEditEngineEditOrderTransaction' => 'PhabricatorEditEngineTransactionType',
     'PhabricatorEditEngineExtension' => 'Phobject',
     'PhabricatorEditEngineExtensionModule' => 'PhabricatorConfigModule',
+    'PhabricatorEditEngineIsEditTransaction' => 'PhabricatorEditEngineTransactionType',
     'PhabricatorEditEngineListController' => 'PhabricatorEditEngineController',
     'PhabricatorEditEngineLock' => 'Phobject',
+    'PhabricatorEditEngineLocksTransaction' => 'PhabricatorEditEngineTransactionType',
     'PhabricatorEditEngineMFAEngine' => 'Phobject',
+    'PhabricatorEditEngineNameTransaction' => 'PhabricatorEditEngineTransactionType',
+    'PhabricatorEditEngineOrderTransaction' => 'PhabricatorEditEngineTransactionType',
     'PhabricatorEditEnginePointsCommentAction' => 'PhabricatorEditEngineCommentAction',
+    'PhabricatorEditEnginePreambleTransaction' => 'PhabricatorEditEngineTransactionType',
     'PhabricatorEditEngineProfileMenuItem' => 'PhabricatorProfileMenuItem',
     'PhabricatorEditEngineQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
     'PhabricatorEditEngineSearchEngine' => 'PhabricatorApplicationSearchEngine',
@@ -9249,7 +9275,9 @@ phutil_register_library_map(array(
     'PhabricatorEditEngineSubtype' => 'Phobject',
     'PhabricatorEditEngineSubtypeMap' => 'Phobject',
     'PhabricatorEditEngineSubtypeTestCase' => 'PhabricatorTestCase',
+    'PhabricatorEditEngineSubtypeTransaction' => 'PhabricatorEditEngineTransactionType',
     'PhabricatorEditEngineTokenizerCommentAction' => 'PhabricatorEditEngineCommentAction',
+    'PhabricatorEditEngineTransactionType' => 'PhabricatorModularTransactionType',
     'PhabricatorEditField' => 'Phobject',
     'PhabricatorEditPage' => 'Phobject',
     'PhabricatorEditType' => 'Phobject',

src/applications/herald/xaction/HeraldRuleEditTransaction.php

@@ -40,17 +40,10 @@ final class HeraldRuleEditTransaction
   public function newChangeDetailView() {
     $viewer = $this->getViewer();
 
-    $old = $this->getOldValue();
+    return id(new PhabricatorApplicationTransactionJSONDiffDetailView())
-    $new = $this->getNewValue();
-
-    $json = new PhutilJSON();
-    $old_json = $json->encodeFormatted($old);
-    $new_json = $json->encodeFormatted($new);
-
-    return id(new PhabricatorApplicationTransactionTextDiffDetailView())
       ->setViewer($viewer)
-      ->setOldText($old_json)
+      ->setOld($this->getOldValue())
-      ->setNewText($new_json);
+      ->setNew($this->getNewValue());
   }
 
 }

src/applications/transactions/controller/PhabricatorEditEngineConfigurationDefaultCreateController.php

@@ -15,7 +15,7 @@ final class PhabricatorEditEngineConfigurationDefaultCreateController
     $key = $config->getIdentifier();
     $cancel_uri = "/transactions/editengine/{$engine_key}/view/{$key}/";
 
-    $type = PhabricatorEditEngineConfigurationTransaction::TYPE_DEFAULTCREATE;
+    $type = PhabricatorEditEngineDefaultCreateTransaction::TRANSACTIONTYPE;
 
     if ($request->isFormPost()) {
       $xactions = array();

src/applications/transactions/controller/PhabricatorEditEngineConfigurationDefaultsController.php

@@ -52,7 +52,7 @@ final class PhabricatorEditEngineConfigurationDefaultsController
         $field->readValueFromSubmit($request);
       }
 
-      $type = PhabricatorEditEngineConfigurationTransaction::TYPE_DEFAULT;
+      $type = PhabricatorEditEngineDefaultTransaction::TRANSACTIONTYPE;
 
       $xactions = array();
       foreach ($fields as $field) {

src/applications/transactions/controller/PhabricatorEditEngineConfigurationDisableController.php

@@ -15,7 +15,7 @@ final class PhabricatorEditEngineConfigurationDisableController
     $key = $config->getIdentifier();
     $cancel_uri = "/transactions/editengine/{$engine_key}/view/{$key}/";
 
-    $type = PhabricatorEditEngineConfigurationTransaction::TYPE_DISABLE;
+    $type = PhabricatorEditEngineDisableTransaction::TRANSACTIONTYPE;
 
     if ($request->isFormPost()) {
       $xactions = array();

src/applications/transactions/controller/PhabricatorEditEngineConfigurationIsEditController.php

@@ -15,8 +15,7 @@ final class PhabricatorEditEngineConfigurationIsEditController
     $key = $config->getIdentifier();
     $cancel_uri = "/transactions/editengine/{$engine_key}/view/{$key}/";
 
-    $type = PhabricatorEditEngineConfigurationTransaction::TYPE_ISEDIT;
+    $type = PhabricatorEditEngineIsEditTransaction::TRANSACTIONTYPE;
-
     if ($request->isFormPost()) {
       $xactions = array();
 

src/applications/transactions/controller/PhabricatorEditEngineConfigurationLockController.php

@@ -30,8 +30,7 @@ final class PhabricatorEditEngineConfigurationLockController
       $xactions = array();
 
       $locks = $request->getArr('locks');
-      $type_locks = PhabricatorEditEngineConfigurationTransaction::TYPE_LOCKS;
+      $type_locks = PhabricatorEditEngineLocksTransaction::TRANSACTIONTYPE;
-
       $xactions[] = id(new PhabricatorEditEngineConfigurationTransaction())
         ->setTransactionType($type_locks)
         ->setNewValue($locks);

src/applications/transactions/controller/PhabricatorEditEngineConfigurationReorderController.php

@@ -31,8 +31,7 @@ final class PhabricatorEditEngineConfigurationReorderController
       $xactions = array();
       $key_order = $request->getStrList('keyOrder');
 
-      $type_order = PhabricatorEditEngineConfigurationTransaction::TYPE_ORDER;
+      $type_order = PhabricatorEditEngineOrderTransaction::TRANSACTIONTYPE;
-
       $xactions[] = id(new PhabricatorEditEngineConfigurationTransaction())
         ->setTransactionType($type_order)
         ->setNewValue($key_order);

src/applications/transactions/controller/PhabricatorEditEngineConfigurationSortController.php

@@ -70,10 +70,10 @@ final class PhabricatorEditEngineConfigurationSortController
 
         if ($is_create) {
           $xaction_type =
-            PhabricatorEditEngineConfigurationTransaction::TYPE_CREATEORDER;
+            PhabricatorEditEngineCreateOrderTransaction::TRANSACTIONTYPE;
         } else {
           $xaction_type =
-            PhabricatorEditEngineConfigurationTransaction::TYPE_EDITORDER;
+            PhabricatorEditEngineEditOrderTransaction::TRANSACTIONTYPE;
         }
 
         $xactions[] = id(new PhabricatorEditEngineConfigurationTransaction())

src/applications/transactions/controller/PhabricatorEditEngineConfigurationSubtypeController.php

@@ -35,9 +35,7 @@ final class PhabricatorEditEngineConfigurationSubtypeController
       $xactions = array();
 
       $subtype = $request->getStr('subtype');
-      $type_subtype =
+      $type_subtype = PhabricatorEditEngineSubtypeTransaction::TRANSACTIONTYPE;
-        PhabricatorEditEngineConfigurationTransaction::TYPE_SUBTYPE;
-
       $xactions[] = id(new PhabricatorEditEngineConfigurationTransaction())
         ->setTransactionType($type_subtype)
         ->setNewValue($subtype);

src/applications/transactions/editor/PhabricatorEditEngineConfigurationEditEngine.php

@@ -99,14 +99,14 @@ final class PhabricatorEditEngineConfigurationEditEngine
         ->setLabel(pht('Name'))
         ->setDescription(pht('Name of the form.'))
         ->setTransactionType(
-          PhabricatorEditEngineConfigurationTransaction::TYPE_NAME)
+          PhabricatorEditEngineNameTransaction::TRANSACTIONTYPE)
         ->setValue($object->getName()),
       id(new PhabricatorRemarkupEditField())
         ->setKey('preamble')
         ->setLabel(pht('Preamble'))
         ->setDescription(pht('Optional instructions, shown above the form.'))
         ->setTransactionType(
-          PhabricatorEditEngineConfigurationTransaction::TYPE_PREAMBLE)
+          PhabricatorEditEnginePreambleTransaction::TRANSACTIONTYPE)
         ->setValue($object->getPreamble()),
     );
   }

src/applications/transactions/editor/PhabricatorEditEngineConfigurationEditor.php

@@ -13,191 +13,9 @@ final class PhabricatorEditEngineConfigurationEditor
 
   public function getTransactionTypes() {
     $types = parent::getTransactionTypes();
-
     $types[] = PhabricatorTransactions::TYPE_VIEW_POLICY;
 
-    $types[] = PhabricatorEditEngineConfigurationTransaction::TYPE_NAME;
-    $types[] = PhabricatorEditEngineConfigurationTransaction::TYPE_PREAMBLE;
-    $types[] = PhabricatorEditEngineConfigurationTransaction::TYPE_ORDER;
-    $types[] = PhabricatorEditEngineConfigurationTransaction::TYPE_DEFAULT;
-    $types[] = PhabricatorEditEngineConfigurationTransaction::TYPE_LOCKS;
-    $types[] = PhabricatorEditEngineConfigurationTransaction::TYPE_SUBTYPE;
-    $types[] =
-      PhabricatorEditEngineConfigurationTransaction::TYPE_DEFAULTCREATE;
-    $types[] = PhabricatorEditEngineConfigurationTransaction::TYPE_ISEDIT;
-    $types[] = PhabricatorEditEngineConfigurationTransaction::TYPE_DISABLE;
-
-    $types[] = PhabricatorEditEngineConfigurationTransaction::TYPE_CREATEORDER;
-    $types[] = PhabricatorEditEngineConfigurationTransaction::TYPE_EDITORDER;
-
     return $types;
   }
 
-  protected function validateTransaction(
-    PhabricatorLiskDAO $object,
-    $type,
-    array $xactions) {
-
-    $errors = parent::validateTransaction($object, $type, $xactions);
-    switch ($type) {
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_NAME:
-        $missing = $this->validateIsEmptyTextField(
-          $object->getName(),
-          $xactions);
-
-        if ($missing) {
-          $error = new PhabricatorApplicationTransactionValidationError(
-            $type,
-            pht('Required'),
-            pht('Form name is required.'),
-            nonempty(last($xactions), null));
-
-          $error->setIsMissingFieldError(true);
-          $errors[] = $error;
-        }
-        break;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_SUBTYPE:
-        if ($xactions) {
-          $map = $object->getEngine()
-            ->setViewer($this->getActor())
-            ->newSubtypeMap();
-          foreach ($xactions as $xaction) {
-            $new = $xaction->getNewValue();
-
-            if ($map->isValidSubtype($new)) {
-              continue;
-            }
-
-            $errors[] = new PhabricatorApplicationTransactionValidationError(
-              $type,
-              pht('Invalid'),
-              pht('Subtype "%s" is not a valid subtype.', $new),
-              $xaction);
-          }
-        }
-        break;
-    }
-
-    return $errors;
-  }
-
-  protected function getCustomTransactionOldValue(
-    PhabricatorLiskDAO $object,
-    PhabricatorApplicationTransaction $xaction) {
-
-    switch ($xaction->getTransactionType()) {
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_NAME:
-        return $object->getName();
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_PREAMBLE;
-        return $object->getPreamble();
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_ORDER:
-        return $object->getFieldOrder();
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_DEFAULT:
-        $field_key = $xaction->getMetadataValue('field.key');
-        return $object->getFieldDefault($field_key);
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_LOCKS:
-        return $object->getFieldLocks();
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_SUBTYPE:
-        return $object->getSubtype();
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_DEFAULTCREATE:
-        return (int)$object->getIsDefault();
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_ISEDIT:
-        return (int)$object->getIsEdit();
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_DISABLE:
-        return (int)$object->getIsDisabled();
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_CREATEORDER:
-        return (int)$object->getCreateOrder();
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_EDITORDER:
-        return (int)$object->getEditOrder();
-
-    }
-  }
-
-  protected function getCustomTransactionNewValue(
-    PhabricatorLiskDAO $object,
-    PhabricatorApplicationTransaction $xaction) {
-
-    switch ($xaction->getTransactionType()) {
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_NAME:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_PREAMBLE;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_ORDER:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_DEFAULT:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_LOCKS:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_SUBTYPE:
-        return $xaction->getNewValue();
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_DEFAULTCREATE:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_ISEDIT:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_DISABLE:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_CREATEORDER:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_EDITORDER:
-        return (int)$xaction->getNewValue();
-    }
-  }
-
-  protected function applyCustomInternalTransaction(
-    PhabricatorLiskDAO $object,
-    PhabricatorApplicationTransaction $xaction) {
-
-    switch ($xaction->getTransactionType()) {
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_NAME:
-        $object->setName($xaction->getNewValue());
-        return;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_PREAMBLE;
-        $object->setPreamble($xaction->getNewValue());
-        return;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_ORDER:
-        $object->setFieldOrder($xaction->getNewValue());
-        return;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_DEFAULT:
-        $field_key = $xaction->getMetadataValue('field.key');
-        $object->setFieldDefault($field_key, $xaction->getNewValue());
-        return;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_LOCKS:
-        $object->setFieldLocks($xaction->getNewValue());
-        return;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_SUBTYPE:
-        $object->setSubtype($xaction->getNewValue());
-        return;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_DEFAULTCREATE:
-        $object->setIsDefault($xaction->getNewValue());
-        return;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_ISEDIT:
-        $object->setIsEdit($xaction->getNewValue());
-        return;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_DISABLE:
-        $object->setIsDisabled($xaction->getNewValue());
-        return;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_CREATEORDER:
-        $object->setCreateOrder($xaction->getNewValue());
-        return;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_EDITORDER:
-        $object->setEditOrder($xaction->getNewValue());
-        return;
-    }
-
-    return parent::applyCustomInternalTransaction($object, $xaction);
-  }
-
-  protected function applyCustomExternalTransaction(
-    PhabricatorLiskDAO $object,
-    PhabricatorApplicationTransaction $xaction) {
-
-    switch ($xaction->getTransactionType()) {
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_NAME:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_PREAMBLE;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_ORDER;
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_DEFAULT:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_ISEDIT:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_LOCKS:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_SUBTYPE:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_DEFAULTCREATE:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_DISABLE:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_CREATEORDER:
-      case PhabricatorEditEngineConfigurationTransaction::TYPE_EDITORDER:
-        return;
-    }
-
-    return parent::applyCustomExternalTransaction($object, $xaction);
-  }
-
 }

src/applications/transactions/storage/PhabricatorEditEngineConfigurationTransaction.php

@@ -1,19 +1,7 @@
 <?php
 
 final class PhabricatorEditEngineConfigurationTransaction
-  extends PhabricatorApplicationTransaction {
+  extends PhabricatorModularTransaction {
-
-  const TYPE_NAME = 'editengine.config.name';
-  const TYPE_PREAMBLE = 'editengine.config.preamble';
-  const TYPE_ORDER = 'editengine.config.order';
-  const TYPE_DEFAULT = 'editengine.config.default';
-  const TYPE_LOCKS = 'editengine.config.locks';
-  const TYPE_DEFAULTCREATE = 'editengine.config.default.create';
-  const TYPE_ISEDIT = 'editengine.config.isedit';
-  const TYPE_DISABLE = 'editengine.config.disable';
-  const TYPE_CREATEORDER = 'editengine.order.create';
-  const TYPE_EDITORDER = 'editengine.order.edit';
-  const TYPE_SUBTYPE = 'editengine.config.subtype';
 
   public function getApplicationName() {
     return 'search';
@@ -23,203 +11,8 @@ final class PhabricatorEditEngineConfigurationTransaction
     return PhabricatorEditEngineConfigurationPHIDType::TYPECONST;
   }
 
-  public function getTitle() {
+  public function getBaseTransactionClass() {
-    $author_phid = $this->getAuthorPHID();
+    return 'PhabricatorEditEngineTransactionType';
-
-    $old = $this->getOldValue();
-    $new = $this->getNewValue();
-
-    $type = $this->getTransactionType();
-    switch ($type) {
-      case PhabricatorTransactions::TYPE_CREATE:
-        return pht(
-          '%s created this form configuration.',
-          $this->renderHandleLink($author_phid));
-      case self::TYPE_NAME:
-        if (strlen($old)) {
-          return pht(
-            '%s renamed this form from "%s" to "%s".',
-            $this->renderHandleLink($author_phid),
-            $old,
-            $new);
-        } else {
-          return pht(
-            '%s named this form "%s".',
-            $this->renderHandleLink($author_phid),
-            $new);
-        }
-      case self::TYPE_PREAMBLE:
-        return pht(
-          '%s updated the preamble for this form.',
-            $this->renderHandleLink($author_phid));
-      case self::TYPE_ORDER:
-        return pht(
-          '%s reordered the fields in this form.',
-          $this->renderHandleLink($author_phid));
-      case self::TYPE_DEFAULT:
-        $key = $this->getMetadataValue('field.key');
-
-        $object = $this->getObject();
-        $engine = $object->getEngine();
-        $fields = $engine->getFieldsForConfig($object);
-
-        $field = idx($fields, $key);
-        if (!$field) {
-          return pht(
-            '%s changed the default value for field "%s".',
-            $this->renderHandleLink($author_phid),
-            $key);
-        }
-
-        return pht(
-          '%s changed the default value for field "%s".',
-          $this->renderHandleLink($author_phid),
-          $field->getLabel());
-      case self::TYPE_LOCKS:
-        return pht(
-          '%s changed locked and hidden fields.',
-          $this->renderHandleLink($author_phid));
-      case self::TYPE_DEFAULTCREATE:
-        if ($new) {
-          return pht(
-            '%s added this form to the "Create" menu.',
-            $this->renderHandleLink($author_phid));
-        } else {
-          return pht(
-            '%s removed this form from the "Create" menu.',
-            $this->renderHandleLink($author_phid));
-        }
-      case self::TYPE_ISEDIT:
-        if ($new) {
-          return pht(
-            '%s marked this form as an edit form.',
-            $this->renderHandleLink($author_phid));
-        } else {
-          return pht(
-            '%s unmarked this form as an edit form.',
-            $this->renderHandleLink($author_phid));
-        }
-      case self::TYPE_DISABLE:
-        if ($new) {
-          return pht(
-            '%s disabled this form.',
-            $this->renderHandleLink($author_phid));
-        } else {
-          return pht(
-            '%s enabled this form.',
-            $this->renderHandleLink($author_phid));
-        }
-      case self::TYPE_SUBTYPE:
-        return pht(
-          '%s changed the subtype of this form from "%s" to "%s".',
-          $this->renderHandleLink($author_phid),
-          $old,
-          $new);
-    }
-
-    return parent::getTitle();
-  }
-
-  public function getColor() {
-    $author_phid = $this->getAuthorPHID();
-
-    $old = $this->getOldValue();
-    $new = $this->getNewValue();
-
-    $type = $this->getTransactionType();
-    switch ($type) {
-      case PhabricatorTransactions::TYPE_CREATE:
-        return 'green';
-      case self::TYPE_DISABLE:
-        if ($new) {
-          return 'indigo';
-        } else {
-          return 'green';
-        }
-    }
-
-    return parent::getColor();
-  }
-
-  public function getIcon() {
-    $author_phid = $this->getAuthorPHID();
-
-    $old = $this->getOldValue();
-    $new = $this->getNewValue();
-
-    $type = $this->getTransactionType();
-    switch ($type) {
-      case PhabricatorTransactions::TYPE_CREATE:
-        return 'fa-plus';
-      case self::TYPE_DISABLE:
-        if ($new) {
-          return 'fa-ban';
-        } else {
-          return 'fa-check';
-        }
-    }
-
-    return parent::getIcon();
-  }
-
-  protected function newRemarkupChanges() {
-    $changes = array();
-
-    $type = $this->getTransactionType();
-    switch ($type) {
-      case self::TYPE_PREAMBLE:
-        $changes[] = $this->newRemarkupChange()
-          ->setOldValue($this->getOldValue())
-          ->setNewValue($this->getNewValue());
-        break;
-    }
-
-    return $changes;
-  }
-
-  public function hasChangeDetails() {
-    switch ($this->getTransactionType()) {
-      case self::TYPE_DEFAULT:
-        return true;
-    }
-
-    return parent::hasChangeDetails();
-  }
-
-  public function renderChangeDetails(PhabricatorUser $viewer) {
-    switch ($this->getTransactionType()) {
-      case self::TYPE_DEFAULT:
-        $old_value = $this->getOldValue();
-        $new_value = $this->getNewValue();
-
-        $old_value = $this->renderDefaultValueAsFallbackText($old_value);
-        $new_value = $this->renderDefaultValueAsFallbackText($new_value);
-
-        return $this->renderTextCorpusChangeDetails(
-          $viewer,
-          $old_value,
-          $new_value);
-    }
-
-    return parent::renderChangeDetails($viewer);
-  }
-
-  private function renderDefaultValueAsFallbackText($default_value) {
-    // See T13319. When rendering an "alice changed the default value for
-    // field X." story on custom forms, we may fall back to a generic
-    // rendering. Try to present the value change in a comprehensible way
-    // even if it isn't especially human readable (for example, it may
-    // contain PHIDs or other internal identifiers).
-
-    if (is_scalar($default_value) || is_null($default_value)) {
-      return $default_value;
-    }
-
-    if (phutil_is_natural_list($default_value)) {
-      return id(new PhutilJSON())->encodeAsList($default_value);
-    }
-
-    return id(new PhutilJSON())->encodeAsObject($default_value);
   }
 
 }

src/applications/transactions/view/PhabricatorApplicationTransactionDetailView.php

@@ -0,0 +1,172 @@
+<?php
+
+abstract class PhabricatorApplicationTransactionDetailView
+  extends AphrontView {
+    protected $oldText;
+    protected $newText;
+
+    public function setNewText($new_text) {
+      $this->newText = $new_text;
+      return $this;
+    }
+
+    public function setOldText($old_text) {
+      $this->oldText = $old_text;
+      return $this;
+    }
+
+    public function renderForMail() {
+      $diff = $this->buildDiff();
+
+      $viewer = $this->getViewer();
+      $old_bright = $viewer->getCSSValue('old-bright');
+      $new_bright = $viewer->getCSSValue('new-bright');
+
+      $old_styles = array(
+        'padding: 0 2px;',
+        'color: #333333;',
+        "background: {$old_bright};",
+      );
+      $old_styles = implode(' ', $old_styles);
+
+      $new_styles = array(
+        'padding: 0 2px;',
+        'color: #333333;',
+        "background: {$new_bright};",
+      );
+      $new_styles = implode(' ', $new_styles);
+
+      $omit_styles = array(
+        'padding: 8px 0;',
+      );
+      $omit_styles = implode(' ', $omit_styles);
+
+      $result = array();
+      foreach ($diff->getSummaryParts() as $part) {
+        $type = $part['type'];
+        $text = $part['text'];
+        switch ($type) {
+          case '.':
+            $result[] = phutil_tag(
+              'div',
+              array(
+                'style' => $omit_styles,
+              ),
+              pht('...'));
+            break;
+          case '-':
+            $result[] = phutil_tag(
+              'span',
+              array(
+                'style' => $old_styles,
+              ),
+              $text);
+            break;
+          case '+':
+            $result[] = phutil_tag(
+              'span',
+              array(
+                'style' => $new_styles,
+              ),
+              $text);
+            break;
+          case '=':
+            $result[] = $text;
+            break;
+        }
+      }
+
+      $styles = array(
+        'white-space: pre-wrap;',
+        'color: #74777D;',
+      );
+
+      // Beyond applying "pre-wrap", convert newlines to "<br />" explicitly
+      // to improve behavior in clients like Airmail.
+      $result = phutil_escape_html_newlines($result);
+
+      return phutil_tag(
+        'div',
+        array(
+          'style' => implode(' ', $styles),
+        ),
+        $result);
+    }
+
+    public function render() {
+      $diff = $this->buildDiff();
+
+      require_celerity_resource('differential-changeset-view-css');
+
+      $result = array();
+      foreach ($diff->getParts() as $part) {
+        $type = $part['type'];
+        $text = $part['text'];
+        switch ($type) {
+          case '-':
+            $result[] = phutil_tag(
+              'span',
+              array(
+                'class' => 'old',
+              ),
+              $text);
+            break;
+          case '+':
+            $result[] = phutil_tag(
+              'span',
+              array(
+                'class' => 'new',
+              ),
+              $text);
+            break;
+          case '=':
+            $result[] = $text;
+            break;
+        }
+      }
+
+      $diff_view = phutil_tag(
+        'div',
+        array(
+          'class' => 'prose-diff',
+        ),
+        $result);
+
+      $old_view = phutil_tag(
+        'div',
+        array(
+          'class' => 'prose-diff',
+        ),
+        $this->oldText);
+
+      $new_view = phutil_tag(
+        'div',
+        array(
+          'class' => 'prose-diff',
+        ),
+        $this->newText);
+
+      return id(new PHUITabGroupView())
+        ->addTab(
+          id(new PHUITabView())
+            ->setKey('old')
+            ->setName(pht('Old'))
+            ->appendChild($old_view))
+        ->addTab(
+          id(new PHUITabView())
+            ->setKey('new')
+            ->setName(pht('New'))
+            ->appendChild($new_view))
+        ->addTab(
+          id(new PHUITabView())
+            ->setKey('diff')
+            ->setName(pht('Diff'))
+            ->appendChild($diff_view))
+        ->selectTab('diff');
+    }
+
+    private function buildDiff() {
+      $engine = new PhutilProseDifferenceEngine();
+      return $engine->getDiff($this->oldText, $this->newText);
+    }
+}

src/applications/transactions/view/PhabricatorApplicationTransactionJSONDiffDetailView.php

@@ -0,0 +1,17 @@
+<?php
+
+final class PhabricatorApplicationTransactionJSONDiffDetailView
+  extends PhabricatorApplicationTransactionDetailView {
+
+  public function setNew($new_object) {
+    $json = new PhutilJSON();
+    $this->setNewText($json->encodeFormatted($new_object));
+    return $this;
+  }
+
+  public function setOld($old_object) {
+    $json = new PhutilJSON();
+    $this->setOldText($json->encodeFormatted($old_object));
+    return $this;
+  }
+}

src/applications/transactions/view/PhabricatorApplicationTransactionTextDiffDetailView.php

@@ -1,174 +1,4 @@
 <?php
 
 final class PhabricatorApplicationTransactionTextDiffDetailView
-  extends AphrontView {
+  extends  PhabricatorApplicationTransactionDetailView {}
-
-  private $oldText;
-  private $newText;
-
-  public function setNewText($new_text) {
-    $this->newText = $new_text;
-    return $this;
-  }
-
-  public function setOldText($old_text) {
-    $this->oldText = $old_text;
-    return $this;
-  }
-
-  public function renderForMail() {
-    $diff = $this->buildDiff();
-
-    $viewer = $this->getViewer();
-    $old_bright = $viewer->getCSSValue('old-bright');
-    $new_bright = $viewer->getCSSValue('new-bright');
-
-    $old_styles = array(
-      'padding: 0 2px;',
-      'color: #333333;',
-      "background: {$old_bright};",
-    );
-    $old_styles = implode(' ', $old_styles);
-
-    $new_styles = array(
-      'padding: 0 2px;',
-      'color: #333333;',
-      "background: {$new_bright};",
-    );
-    $new_styles = implode(' ', $new_styles);
-
-    $omit_styles = array(
-      'padding: 8px 0;',
-    );
-    $omit_styles = implode(' ', $omit_styles);
-
-    $result = array();
-    foreach ($diff->getSummaryParts() as $part) {
-      $type = $part['type'];
-      $text = $part['text'];
-      switch ($type) {
-        case '.':
-          $result[] = phutil_tag(
-            'div',
-            array(
-              'style' => $omit_styles,
-            ),
-            pht('...'));
-          break;
-        case '-':
-          $result[] = phutil_tag(
-            'span',
-            array(
-              'style' => $old_styles,
-            ),
-            $text);
-          break;
-        case '+':
-          $result[] = phutil_tag(
-            'span',
-            array(
-              'style' => $new_styles,
-            ),
-            $text);
-          break;
-        case '=':
-          $result[] = $text;
-          break;
-      }
-    }
-
-    $styles = array(
-      'white-space: pre-wrap;',
-      'color: #74777D;',
-    );
-
-    // Beyond applying "pre-wrap", convert newlines to "<br />" explicitly
-    // to improve behavior in clients like Airmail.
-    $result = phutil_escape_html_newlines($result);
-
-    return phutil_tag(
-      'div',
-      array(
-        'style' => implode(' ', $styles),
-      ),
-      $result);
-  }
-
-  public function render() {
-    $diff = $this->buildDiff();
-
-    require_celerity_resource('differential-changeset-view-css');
-
-    $result = array();
-    foreach ($diff->getParts() as $part) {
-      $type = $part['type'];
-      $text = $part['text'];
-      switch ($type) {
-        case '-':
-          $result[] = phutil_tag(
-            'span',
-            array(
-              'class' => 'old',
-            ),
-            $text);
-          break;
-        case '+':
-          $result[] = phutil_tag(
-            'span',
-            array(
-              'class' => 'new',
-            ),
-            $text);
-          break;
-        case '=':
-          $result[] = $text;
-          break;
-      }
-    }
-
-    $diff_view = phutil_tag(
-      'div',
-      array(
-        'class' => 'prose-diff',
-      ),
-      $result);
-
-    $old_view = phutil_tag(
-      'div',
-      array(
-        'class' => 'prose-diff',
-      ),
-      $this->oldText);
-
-    $new_view = phutil_tag(
-      'div',
-      array(
-        'class' => 'prose-diff',
-      ),
-      $this->newText);
-
-    return id(new PHUITabGroupView())
-      ->addTab(
-        id(new PHUITabView())
-          ->setKey('old')
-          ->setName(pht('Old'))
-          ->appendChild($old_view))
-      ->addTab(
-        id(new PHUITabView())
-          ->setKey('new')
-          ->setName(pht('New'))
-          ->appendChild($new_view))
-      ->addTab(
-        id(new PHUITabView())
-          ->setKey('diff')
-          ->setName(pht('Diff'))
-          ->appendChild($diff_view))
-      ->selectTab('diff');
-  }
-
-  private function buildDiff() {
-    $engine = new PhutilProseDifferenceEngine();
-    return $engine->getDiff($this->oldText, $this->newText);
-  }
-
-}

src/applications/transactions/xaction/PhabricatorEditEngineCreateOrderTransaction.php

@@ -0,0 +1,26 @@
+<?php
+
+final class PhabricatorEditEngineCreateOrderTransaction
+  extends PhabricatorEditEngineTransactionType {
+
+  const TRANSACTIONTYPE = 'editengine.order.create';
+
+  public function generateOldValue($object) {
+    return (int)$object->getCreateOrder();
+  }
+
+  public function generateNewValue($object, $value) {
+    return (int)$value;
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setCreateOrder($value);
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s changed the order in which this form appears in the "Create" menu.',
+      $this->renderAuthor());
+  }
+
+}

src/applications/transactions/xaction/PhabricatorEditEngineDefaultCreateTransaction.php

@@ -0,0 +1,35 @@
+<?php
+
+final class PhabricatorEditEngineDefaultCreateTransaction
+  extends PhabricatorEditEngineTransactionType {
+
+  const TRANSACTIONTYPE = 'editengine.config.default.create';
+
+  public function generateOldValue($object) {
+    return (int)$object->getIsDefault();
+  }
+
+  public function generateNewValue($object, $value) {
+    return (int)$value;
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setIsDefault($value);
+  }
+
+  public function getTitle() {
+    $old = $this->getOldValue();
+    $new = $this->getNewValue();
+
+    if ($new) {
+      return pht(
+        '%s added this form to the "Create" menu.',
+        $this->renderAuthor());
+    } else {
+      return pht(
+        '%s removed this form from the "Create" menu.',
+        $this->renderAuthor());
+    }
+  }
+
+}

src/applications/transactions/xaction/PhabricatorEditEngineDefaultTransaction.php

@@ -0,0 +1,71 @@
+<?php
+
+final class PhabricatorEditEngineDefaultTransaction
+  extends PhabricatorEditEngineTransactionType {
+
+  const TRANSACTIONTYPE = 'editengine.config.default';
+
+  public function generateOldValue($object) {
+    $field_key = $this->getMetadataValue('field.key');
+    return $object->getFieldDefault($field_key);
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $field_key = $this->getMetadataValue('field.key');
+    $object->setFieldDefault($field_key, $value);
+  }
+
+  public function getTitle() {
+    $key = $this->getMetadataValue('field.key');
+    $object = $this->getObject();
+    $engine = $object->getEngine();
+    $fields = $engine->getFieldsForConfig($object);
+    $field = idx($fields, $key);
+
+    if (!$field) {
+      return pht(
+        '%s changed the default values for field %s.',
+        $this->renderAuthor(),
+        $this->renderValue($key));
+    }
+
+    return pht(
+      '%s changed the default value for field %s.',
+      $this->renderAuthor(),
+      $this->renderValue($field->getLabel()));
+  }
+
+  public function hasChangeDetailView() {
+    return true;
+  }
+
+  public function newChangeDetailView() {
+    $viewer = $this->getViewer();
+    $old = $this->renderDefaultValueAsFallbackText($this->getOldValue());
+    $new = $this->renderDefaultValueAsFallbackText($this->getNewValue());
+
+    return id(new PhabricatorApplicationTransactionTextDiffDetailView())
+      ->setViewer($viewer)
+      ->setOldText($old)
+      ->setNewText($new);
+  }
+
+  private function renderDefaultValueAsFallbackText($default_value) {
+    // See T13319. When rendering an "alice changed the default value for
+    // field X." story on custom forms, we may fall back to a generic
+    // rendering. Try to present the value change in a comprehensible way
+    // even if it isn't especially human readable (for example, it may
+    // contain PHIDs or other internal identifiers).
+
+    if (is_scalar($default_value) || is_null($default_value)) {
+      return $default_value;
+    }
+
+    if (phutil_is_natural_list($default_value)) {
+      return id(new PhutilJSON())->encodeAsList($default_value);
+    }
+
+    return id(new PhutilJSON())->encodeAsObject($default_value);
+  }
+
+}

src/applications/transactions/xaction/PhabricatorEditEngineDisableTransaction.php

@@ -0,0 +1,51 @@
+<?php
+
+final class PhabricatorEditEngineDisableTransaction
+  extends PhabricatorEditEngineTransactionType {
+
+  const TRANSACTIONTYPE = 'editengine.config.disable';
+
+  public function generateOldValue($object) {
+    return (int)$object->getIsDisabled();
+  }
+
+  public function generateNewValue($object, $value) {
+    return (int)$value;
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setIsDisabled($value);
+  }
+
+  public function getTitle() {
+    $new = $this->getNewValue();
+    if ($new) {
+      return pht(
+        '%s disabled this form.',
+        $this->renderAuthor());
+    } else {
+      return pht(
+        '%s enabled this form.',
+        $this->renderAuthor());
+    }
+  }
+
+  public function getColor() {
+    $new = $this->getNewValue();
+    if ($new) {
+      return 'indigo';
+    } else {
+      return 'green';
+    }
+  }
+
+  public function getIcon() {
+    $new = $this->getNewValue();
+    if ($new) {
+      return 'fa-ban';
+    } else {
+      return 'fa-check';
+    }
+  }
+
+}

src/applications/transactions/xaction/PhabricatorEditEngineEditOrderTransaction.php

@@ -0,0 +1,26 @@
+<?php
+
+final class PhabricatorEditEngineEditOrderTransaction
+  extends PhabricatorEditEngineTransactionType {
+
+  const TRANSACTIONTYPE = 'editengine.order.edit';
+
+  public function generateOldValue($object) {
+    return (int)$object->getEditOrder();
+  }
+
+  public function generateNewValue($object, $value) {
+    return (int)$value;
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setEditOrder($value);
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s changed the order in which this form appears in the "Edit" menu.',
+      $this->renderAuthor());
+  }
+
+}

src/applications/transactions/xaction/PhabricatorEditEngineIsEditTransaction.php

@@ -0,0 +1,34 @@
+<?php
+
+final class PhabricatorEditEngineIsEditTransaction
+  extends PhabricatorEditEngineTransactionType {
+
+  const TRANSACTIONTYPE = 'editengine.config.isedit';
+
+  public function generateOldValue($object) {
+    return (int)$object->getIsEdit();
+  }
+
+  public function generateNewValue($object, $value) {
+    return (int)$value;
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setIsEdit($value);
+  }
+
+  public function getTitle() {
+    $new = $this->getNewValue();
+
+    if ($new) {
+      return pht(
+        '%s marked this form as an edit form.',
+        $this->renderAuthor());
+    } else {
+      return pht(
+        '%s unmarked this form as an edit form.',
+        $this->renderAuthor());
+    }
+  }
+
+}

src/applications/transactions/xaction/PhabricatorEditEngineLocksTransaction.php

@@ -0,0 +1,35 @@
+<?php
+
+final class PhabricatorEditEngineLocksTransaction
+  extends PhabricatorEditEngineTransactionType {
+
+  const TRANSACTIONTYPE = 'editengine.config.locks';
+
+  public function generateOldValue($object) {
+    return $object->getFieldLocks();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setFieldLocks($value);
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s changed locked and hidden fields.',
+      $this->renderAuthor());
+  }
+
+  public function hasChangeDetailView() {
+    return true;
+  }
+
+  public function newChangeDetailView() {
+    $viewer = $this->getViewer();
+
+    return id(new PhabricatorApplicationTransactionJSONDiffDetailView())
+      ->setViewer($viewer)
+      ->setOld($this->getOldValue())
+      ->setNew($this->getNewValue());
+  }
+
+}

src/applications/transactions/xaction/PhabricatorEditEngineNameTransaction.php

@@ -0,0 +1,54 @@
+<?php
+
+final class PhabricatorEditEngineNameTransaction
+  extends PhabricatorEditEngineTransactionType {
+
+  const TRANSACTIONTYPE = 'editengine.config.name';
+
+  public function generateOldValue($object) {
+    return $object->getName();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setName($value);
+  }
+
+  public function getTitle() {
+    if (strlen($this->getOldValue())) {
+      return pht(
+        '%s renamed this form from %s to %s.',
+        $this->renderAuthor(),
+        $this->renderOldValue(),
+        $this->renderNewValue());
+    } else {
+      return pht(
+        '%s named this form %s.',
+        $this->renderAuthor(),
+        $this->renderNewValue());
+    }
+  }
+
+  public function validateTransactions($object, array $xactions) {
+    $errors = array();
+
+    foreach ($xactions as $xaction) {
+      $new = $xaction->getNewValue();
+      if (!strlen($new)) {
+        $errors[] = $this->newRequiredError(
+          pht('Form name is required.'),
+          $xaction);
+        continue;
+      }
+    }
+
+    if (!$errors) {
+      if ($this->isEmptyTextTransaction($object->getName(), $xactions)) {
+        $errors[] = $this->newRequiredError(
+          pht('Forms must have a name.'));
+      }
+    }
+
+    return $errors;
+  }
+
+}

src/applications/transactions/xaction/PhabricatorEditEngineOrderTransaction.php

@@ -0,0 +1,35 @@
+<?php
+
+final class PhabricatorEditEngineOrderTransaction
+  extends PhabricatorEditEngineTransactionType {
+
+  const TRANSACTIONTYPE = 'editengine.config.order';
+
+  public function generateOldValue($object) {
+    return $object->getFieldOrder();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setFieldOrder($value);
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s reordered the fields in this form.',
+      $this->renderAuthor());
+  }
+
+  public function hasChangeDetailView() {
+    return true;
+  }
+
+  public function newChangeDetailView() {
+    $viewer = $this->getViewer();
+
+    return id(new PhabricatorApplicationTransactionJSONDiffDetailView())
+      ->setViewer($viewer)
+      ->setOld($this->getOldValue())
+      ->setNew($this->getNewValue());
+  }
+
+}

src/applications/transactions/xaction/PhabricatorEditEnginePreambleTransaction.php

@@ -0,0 +1,45 @@
+<?php
+
+final class PhabricatorEditEnginePreambleTransaction
+  extends PhabricatorEditEngineTransactionType {
+
+  const TRANSACTIONTYPE = 'editengine.config.preamble';
+
+  public function generateOldValue($object) {
+    return $object->getPreamble();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setPreamble($value);
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s updated the preamble for this form.',
+      $this->renderAuthor());
+  }
+
+  public function hasChangeDetailView() {
+    return true;
+  }
+
+  public function newChangeDetailView() {
+    $viewer = $this->getViewer();
+
+    return id(new PhabricatorApplicationTransactionTextDiffDetailView())
+      ->setViewer($viewer)
+      ->setOldText($this->getOldValue())
+      ->setNewText($this->getNewValue());
+  }
+
+  public function newRemarkupChanges() {
+    $changes = array();
+
+    $changes[] = $this->newRemarkupChange()
+      ->setOldValue($this->getOldValue())
+      ->setNewValue($this->getNewValue());
+
+    return $changes;
+  }
+
+}

src/applications/transactions/xaction/PhabricatorEditEngineSubtypeTransaction.php

@@ -0,0 +1,48 @@
+<?php
+
+final class PhabricatorEditEngineSubtypeTransaction
+  extends PhabricatorEditEngineTransactionType {
+
+  const TRANSACTIONTYPE = 'editengine.config.subtype';
+
+  public function generateOldValue($object) {
+    return $object->getSubtype();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setSubtype($value);
+  }
+
+  public function getTitle() {
+    $old = $this->getOldValue();
+    $new = $this->getNewValue();
+
+    return pht(
+      '%s changed the subtype of this form from %s to %s.',
+      $this->renderAuthor(),
+      $this->renderOldValue(),
+      $this->renderNewValue());
+  }
+
+  public function validateTransactions($object, array $xactions) {
+    $map = $object->getEngine()
+      ->setViewer($this->getActor())
+      ->newSubtypeMap();
+
+    $errors = array();
+    foreach ($xactions as $xaction) {
+      $new = $xaction->getNewValue();
+
+      if ($map->isValidSubtype($new)) {
+        continue;
+      }
+
+      $errors[] = $this->newInvalidError(
+        pht('Subtype "%s" is not a valid subtype.', $new),
+        $xaction);
+    }
+
+    return $errors;
+  }
+
+}

src/applications/transactions/xaction/PhabricatorEditEngineTransactionType.php

@@ -0,0 +1,4 @@
+<?php
+
+abstract class PhabricatorEditEngineTransactionType
+  extends PhabricatorModularTransactionType {}