Add a very basic EditPro controller for Differential

Summary: Ref T11114. This doesn't really support anything yet, but technically works if you manually go to `/editpro/`.

Test Plan: {F2117302}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11114

Differential Revision: https://secure.phabricator.com/D17043

src/__phutil_library_map__.php

@@ -518,6 +518,8 @@ phutil_register_library_map(array(
     'DifferentialRevisionDependedOnByRevisionEdgeType' => 'applications/differential/edge/DifferentialRevisionDependedOnByRevisionEdgeType.php',
     'DifferentialRevisionDependsOnRevisionEdgeType' => 'applications/differential/edge/DifferentialRevisionDependsOnRevisionEdgeType.php',
     'DifferentialRevisionEditController' => 'applications/differential/controller/DifferentialRevisionEditController.php',
+    'DifferentialRevisionEditEngine' => 'applications/differential/editor/DifferentialRevisionEditEngine.php',
+    'DifferentialRevisionEditProController' => 'applications/differential/controller/DifferentialRevisionEditProController.php',
     'DifferentialRevisionFulltextEngine' => 'applications/differential/search/DifferentialRevisionFulltextEngine.php',
     'DifferentialRevisionGraph' => 'infrastructure/graph/DifferentialRevisionGraph.php',
     'DifferentialRevisionHasChildRelationship' => 'applications/differential/relationships/DifferentialRevisionHasChildRelationship.php',
@@ -5164,6 +5166,8 @@ phutil_register_library_map(array(
     'DifferentialRevisionDependedOnByRevisionEdgeType' => 'PhabricatorEdgeType',
     'DifferentialRevisionDependsOnRevisionEdgeType' => 'PhabricatorEdgeType',
     'DifferentialRevisionEditController' => 'DifferentialController',
+    'DifferentialRevisionEditEngine' => 'PhabricatorEditEngine',
+    'DifferentialRevisionEditProController' => 'DifferentialController',
     'DifferentialRevisionFulltextEngine' => 'PhabricatorFulltextEngine',
     'DifferentialRevisionGraph' => 'PhabricatorObjectGraph',
     'DifferentialRevisionHasChildRelationship' => 'DifferentialRevisionRelationship',

src/applications/differential/application/PhabricatorDifferentialApplication.php

@@ -67,6 +67,8 @@ final class PhabricatorDifferentialApplication extends PhabricatorApplication {
         'revision/' => array(
           'edit/(?:(?P<id>[1-9]\d*)/)?'
             => 'DifferentialRevisionEditController',
+          $this->getEditRoutePattern('editpro/')
+            => 'DifferentialRevisionEditProController',
           'land/(?:(?P<id>[1-9]\d*))/(?P<strategy>[^/]+)/'
             => 'DifferentialRevisionLandController',
           'closedetails/(?P<phid>[^/]+)/'

src/applications/differential/controller/DifferentialRevisionEditProController.php

@@ -0,0 +1,12 @@
+<?php
+
+final class DifferentialRevisionEditProController
+  extends DifferentialController {
+
+  public function handleRequest(AphrontRequest $request) {
+    return id(new DifferentialRevisionEditEngine())
+      ->setController($this)
+      ->buildResponse();
+  }
+
+}

src/applications/differential/editor/DifferentialRevisionEditEngine.php

@@ -0,0 +1,66 @@
+<?php
+
+final class DifferentialRevisionEditEngine
+  extends PhabricatorEditEngine {
+
+  const ENGINECONST = 'differential.revision';
+
+  public function getEngineName() {
+    return pht('Revisions');
+  }
+
+  public function getSummaryHeader() {
+    return pht('Configure Revision Forms');
+  }
+
+  public function getSummaryText() {
+    return pht(
+      'Configure creation and editing revision forms in Differential.');
+  }
+
+  public function getEngineApplicationClass() {
+    return 'PhabricatorDifferentialApplication';
+  }
+
+  protected function supportsEditEngineConfiguration() {
+    return false;
+  }
+
+  protected function newEditableObject() {
+    $viewer = $this->getViewer();
+    return DifferentialRevision::initializeNewRevision($viewer);
+  }
+
+  protected function newObjectQuery() {
+    return new DifferentialRevisionQuery();
+  }
+
+  protected function getObjectCreateTitleText($object) {
+    return pht('Create New Revision');
+  }
+
+  protected function getObjectEditTitleText($object) {
+    return pht('Edit Revision: %s', $object->getTitle());
+  }
+
+  protected function getObjectEditShortText($object) {
+    return $object->getMonogram();
+  }
+
+  protected function getObjectCreateShortText() {
+    return pht('Create Revision');
+  }
+
+  protected function getObjectName() {
+    return pht('Revision');
+  }
+
+  protected function getObjectViewURI($object) {
+    return $object->getURI();
+  }
+
+  protected function buildCustomEditFields($object) {
+    return array();
+  }
+
+}

src/infrastructure/customfield/engineextension/PhabricatorCustomFieldEditEngineExtension.php

@@ -27,6 +27,12 @@ final class PhabricatorCustomFieldEditEngineExtension
     PhabricatorEditEngine $engine,
     PhabricatorApplicationTransactionInterface $object) {
 
+    // TODO: Remove this hack once Differential modernizes more fully. Today,
+    // its custom fields are too custom to interact cleanly with EditEngine.
+    if ($object instanceof DifferentialRevision) {
+      return array();
+    }
+
     $viewer = $this->getViewer();
 
     $field_list = PhabricatorCustomField::getObjectFields(