Move Differential's remaining field views to extensble field schema

Summary:
Move all the rest of the fields into the custom field schema, for revision
views.

I left a couple of stubs in here (willWriteRevision, didWriteRevision) since I'd
planned to do edits here too, but this diff is sort of big-ish already. I'll do
all the edit fields in the next revision.

Depends on D808.

Test Plan: Viewed, edited and conduit'ed some revisions.
Reviewed By: jungejason
Reviewers: jungejason, tuomaspelkonen, aran
CC: aran, jungejason, epriestley
Differential Revision: 809

src/__phutil_library_map__.php

@@ -139,6 +139,7 @@ phutil_register_library_map(array(
     'DifferentialAuxiliaryField' => 'applications/differential/storage/auxiliaryfield',
     'DifferentialBlameRevisionFieldSpecification' => 'applications/differential/field/specification/blamerev',
     'DifferentialCCWelcomeMail' => 'applications/differential/mail/ccwelcome',
+    'DifferentialCCsFieldSpecification' => 'applications/differential/field/specification/ccs',
     'DifferentialChangeType' => 'applications/differential/constants/changetype',
     'DifferentialChangeset' => 'applications/differential/storage/changeset',
     'DifferentialChangesetDetailView' => 'applications/differential/view/changesetdetailview',
@@ -180,6 +181,7 @@ phutil_register_library_map(array(
     'DifferentialInlineCommentPreviewController' => 'applications/differential/controller/inlinecommentpreview',
     'DifferentialInlineCommentView' => 'applications/differential/view/inlinecomment',
     'DifferentialLinesFieldSpecification' => 'applications/differential/field/specification/lines',
+    'DifferentialLintFieldSpecification' => 'applications/differential/field/specification/lint',
     'DifferentialLintStatus' => 'applications/differential/constants/lintstatus',
     'DifferentialMail' => 'applications/differential/mail/base',
     'DifferentialManiphestTasksFieldSpecification' => 'applications/differential/field/specification/maniphesttasks',
@@ -189,6 +191,7 @@ phutil_register_library_map(array(
     'DifferentialReplyHandler' => 'applications/differential/replyhandler',
     'DifferentialRevertPlanFieldSpecification' => 'applications/differential/field/specification/revertplan',
     'DifferentialReviewRequestMail' => 'applications/differential/mail/reviewrequest',
+    'DifferentialReviewersFieldSpecification' => 'applications/differential/field/specification/reviewers',
     'DifferentialRevision' => 'applications/differential/storage/revision',
     'DifferentialRevisionCommentListView' => 'applications/differential/view/revisioncommentlist',
     'DifferentialRevisionCommentView' => 'applications/differential/view/revisioncomment',
@@ -200,10 +203,12 @@ phutil_register_library_map(array(
     'DifferentialRevisionListController' => 'applications/differential/controller/revisionlist',
     'DifferentialRevisionListData' => 'applications/differential/data/revisionlist',
     'DifferentialRevisionStatus' => 'applications/differential/constants/revisionstatus',
+    'DifferentialRevisionStatusFieldSpecification' => 'applications/differential/field/specification/revisionstatus',
     'DifferentialRevisionUpdateHistoryView' => 'applications/differential/view/revisionupdatehistory',
     'DifferentialRevisionViewController' => 'applications/differential/controller/revisionview',
     'DifferentialSubscribeController' => 'applications/differential/controller/subscribe',
     'DifferentialTasksAttacher' => 'applications/differential/tasks',
+    'DifferentialUnitFieldSpecification' => 'applications/differential/field/specification/unit',
     'DifferentialUnitStatus' => 'applications/differential/constants/unitstatus',
     'DifferentialUnitTestResult' => 'applications/differential/constants/unittestresult',
     'DifferentialViewTime' => 'applications/differential/storage/viewtime',
@@ -792,6 +797,7 @@ phutil_register_library_map(array(
     'DifferentialAuxiliaryField' => 'DifferentialDAO',
     'DifferentialBlameRevisionFieldSpecification' => 'DifferentialFieldSpecification',
     'DifferentialCCWelcomeMail' => 'DifferentialReviewRequestMail',
+    'DifferentialCCsFieldSpecification' => 'DifferentialFieldSpecification',
     'DifferentialChangeset' => 'DifferentialDAO',
     'DifferentialChangesetDetailView' => 'AphrontView',
     'DifferentialChangesetListView' => 'AphrontView',
@@ -820,6 +826,7 @@ phutil_register_library_map(array(
     'DifferentialInlineCommentPreviewController' => 'DifferentialController',
     'DifferentialInlineCommentView' => 'AphrontView',
     'DifferentialLinesFieldSpecification' => 'DifferentialFieldSpecification',
+    'DifferentialLintFieldSpecification' => 'DifferentialFieldSpecification',
     'DifferentialManiphestTasksFieldSpecification' => 'DifferentialFieldSpecification',
     'DifferentialNewDiffMail' => 'DifferentialReviewRequestMail',
     'DifferentialPathFieldSpecification' => 'DifferentialFieldSpecification',
@@ -827,15 +834,18 @@ phutil_register_library_map(array(
     'DifferentialReplyHandler' => 'PhabricatorMailReplyHandler',
     'DifferentialRevertPlanFieldSpecification' => 'DifferentialFieldSpecification',
     'DifferentialReviewRequestMail' => 'DifferentialMail',
+    'DifferentialReviewersFieldSpecification' => 'DifferentialFieldSpecification',
     'DifferentialRevision' => 'DifferentialDAO',
     'DifferentialRevisionCommentListView' => 'AphrontView',
     'DifferentialRevisionCommentView' => 'AphrontView',
     'DifferentialRevisionDetailView' => 'AphrontView',
     'DifferentialRevisionEditController' => 'DifferentialController',
     'DifferentialRevisionListController' => 'DifferentialController',
+    'DifferentialRevisionStatusFieldSpecification' => 'DifferentialFieldSpecification',
     'DifferentialRevisionUpdateHistoryView' => 'AphrontView',
     'DifferentialRevisionViewController' => 'DifferentialController',
     'DifferentialSubscribeController' => 'DifferentialController',
+    'DifferentialUnitFieldSpecification' => 'DifferentialFieldSpecification',
     'DifferentialViewTime' => 'DifferentialDAO',
     'DiffusionBranchTableView' => 'DiffusionView',
     'DiffusionBrowseController' => 'DiffusionController',

src/applications/differential/controller/revisionview/DifferentialRevisionViewController.php

@@ -58,10 +58,7 @@ class DifferentialRevisionViewController extends DifferentialController {
       $diff_vs = null;
     }
 
-    $aux_fields = $this->loadAuxiliaryFields($revision);
+    $aux_fields = $this->loadAuxiliaryFields($revision, $target);
-    foreach ($aux_fields as $aux_field) {
-      $aux_field->setDiff($target);
-    }
 
     list($changesets, $vs_map, $rendering_references) =
       $this->loadChangesetsAndVsMap($diffs, $diff_vs, $target);
@@ -156,47 +153,31 @@ class DifferentialRevisionViewController extends DifferentialController {
       $visible_changesets = $changesets;
     }
 
-    $diff_properties = id(new DifferentialDiffProperty())->loadAllWhere(
-      'diffID = %d AND name IN (%Ls)',
-      $target->getID(),
-      array(
-        'arc:lint',
-        'arc:unit',
-      ));
-    $diff_properties = mpull($diff_properties, 'getData', 'getName');
-
     $revision_detail = new DifferentialRevisionDetailView();
     $revision_detail->setRevision($revision);
     $revision_detail->setAuxiliaryFields($aux_fields);
 
+    $actions = $this->getRevisionActions($revision);
+
     $custom_renderer_class = PhabricatorEnv::getEnvConfig(
       'differential.revision-custom-detail-renderer');
     if ($custom_renderer_class) {
+
+      // TODO: Either deprecate generateProperties() or build a better version
+      // of the action links and deprecate the whole class. Custom fields
+      // now provide a much more powerful version of generateProperties().
+
       PhutilSymbolLoader::loadClass($custom_renderer_class);
       $custom_renderer =
         newv($custom_renderer_class, array());
-    } else {
+      $properties = $custom_renderer->generateProperties($revision, $target);
-      $custom_renderer = null;
-    }
-
-    $properties = $this->getRevisionProperties(
-      $revision,
-      $target,
-      $handles,
-      $diff_properties);
-    if ($custom_renderer) {
-      $properties = array_merge(
-        $properties,
-        $custom_renderer->generateProperties($revision, $target));
-    }
-
       $revision_detail->setProperties($properties);
 
-    $actions = $this->getRevisionActions($revision);
-    if ($custom_renderer) {
       $actions = array_merge(
         $actions,
         $custom_renderer->generateActionLinks($revision, $target));
+    } else {
+      $revision_detail->setProperties(array());
     }
 
     $whitespace = $request->getStr(
@@ -307,143 +288,6 @@ class DifferentialRevisionViewController extends DifferentialController {
     return $comments;
   }
 
-  private function getRevisionProperties(
-    DifferentialRevision $revision,
-    DifferentialDiff $diff,
-    array $handles,
-    array $diff_properties) {
-
-    $properties = array();
-
-    $status = $revision->getStatus();
-    $next_step = null;
-    if ($status == DifferentialRevisionStatus::ACCEPTED) {
-      switch ($diff->getSourceControlSystem()) {
-        case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
-          $next_step = 'arc amend --revision '.$revision->getID();
-          break;
-        case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
-          $next_step = 'arc commit --revision '.$revision->getID();
-          break;
-      }
-      if ($next_step) {
-        $next_step =
-          ' · '.
-          'Next step: <tt>'.phutil_escape_html($next_step).'</tt>';
-      }
-    }
-    $status = DifferentialRevisionStatus::getNameForRevisionStatus($status);
-    $properties['Revision Status'] = '<strong>'.$status.'</strong>'.$next_step;
-
-    $properties['Reviewers'] = $this->renderHandleLinkList(
-      array_select_keys(
-        $handles,
-        $revision->getReviewers()));
-
-    $properties['CCs'] = $this->renderHandleLinkList(
-      array_select_keys(
-        $handles,
-        $revision->getCCPHIDs()));
-
-    $lstar = DifferentialRevisionUpdateHistoryView::renderDiffLintStar($diff);
-    $lmsg = DifferentialRevisionUpdateHistoryView::getDiffLintMessage($diff);
-    $ldata = idx($diff_properties, 'arc:lint');
-    $ltail = null;
-    if ($ldata) {
-      $ldata = igroup($ldata, 'path');
-      $lint_messages = array();
-      foreach ($ldata as $path => $messages) {
-        $message_markup = array();
-        foreach ($messages as $message) {
-          $path = idx($message, 'path');
-          $line = idx($message, 'line');
-
-          $code = idx($message, 'code');
-          $severity = idx($message, 'severity');
-
-          $name = idx($message, 'name');
-          $description = idx($message, 'description');
-
-          $message_markup[] =
-            '<li>'.
-              '<span class="lint-severity-'.phutil_escape_html($severity).'">'.
-                phutil_escape_html(ucwords($severity)).
-              '</span>'.
-              ' '.
-              '('.phutil_escape_html($code).') '.
-              phutil_escape_html($name).
-              ' at line '.phutil_escape_html($line).
-              '<p>'.phutil_escape_html($description).'</p>'.
-            '</li>';
-        }
-        $lint_messages[] =
-          '<li class="lint-file-block">'.
-            'Lint for <strong>'.phutil_escape_html($path).'</strong>'.
-            '<ul>'.implode("\n", $message_markup).'</ul>'.
-          '</li>';
-      }
-      $ltail =
-        '<div class="differential-lint-block">'.
-          '<ul>'.
-            implode("\n", $lint_messages).
-          '</ul>'.
-        '</div>';
-    }
-
-    $properties['Lint'] = $lstar.' '.$lmsg.$ltail;
-
-    $ustar = DifferentialRevisionUpdateHistoryView::renderDiffUnitStar($diff);
-    $umsg = DifferentialRevisionUpdateHistoryView::getDiffUnitMessage($diff);
-
-    $postponed_count = 0;
-    $udata = idx($diff_properties, 'arc:unit');
-    $utail = null;
-    if ($udata) {
-      $unit_messages = array();
-      foreach ($udata as $test) {
-        $name = phutil_escape_html(idx($test, 'name'));
-        $result = phutil_escape_html(idx($test, 'result'));
-
-        if ($result != DifferentialUnitTestResult::RESULT_POSTPONED &&
-            $result != DifferentialUnitTestResult::RESULT_PASS) {
-          $userdata = phutil_escape_html(idx($test, 'userdata'));
-          if (strlen($userdata) > 256) {
-            $userdata = substr($userdata, 0, 256).'...';
-          }
-          $userdata = str_replace("\n", '<br />', $userdata);
-          $unit_messages[] =
-            '<tr>'.
-            '<th>'.$name.'</th>'.
-            '<th class="unit-test-result">'.
-            '<div class="result-'.$result.'">'.
-            strtoupper($result).
-            '</div>'.
-            '</th>'.
-            '<td>'.$userdata.'</td>'.
-            '</tr>';
-
-          $utail =
-            '<div class="differential-unit-block">'.
-            '<table class="differential-unit-table">'.
-            implode("\n", $unit_messages).
-            '</table>'.
-            '</div>';
-        } else if ($result == DifferentialUnitTestResult::RESULT_POSTPONED) {
-          $postponed_count++;
-        }
-      }
-    }
-
-    if ($postponed_count > 0 &&
-        $diff->getUnitStatus() == DifferentialUnitStatus::UNIT_POSTPONED) {
-      $umsg = $postponed_count.' '.$umsg;
-    }
-
-    $properties['Unit'] = $ustar.' '.$umsg.$utail;
-
-    return $properties;
-  }
-
   private function getRevisionActions(DifferentialRevision $revision) {
     $viewer_phid = $this->getRequest()->getUser()->getPHID();
     $viewer_is_owner = ($revision->getAuthorPHID() == $viewer_phid);
@@ -512,14 +356,6 @@ class DifferentialRevisionViewController extends DifferentialController {
     return $links;
   }
 
-
-  private function renderHandleLinkList(array $list) {
-    if (empty($list)) {
-      return '<em>None</em>';
-    }
-    return implode(', ', mpull($list, 'renderLink'));
-  }
-
   private function getRevisionCommentActions(DifferentialRevision $revision) {
 
     $actions = array(
@@ -674,7 +510,9 @@ class DifferentialRevisionViewController extends DifferentialController {
         ->replace();
   }
 
-  private function loadAuxiliaryFields(DifferentialRevision $revision) {
+  private function loadAuxiliaryFields(
+    DifferentialRevision $revision,
+    DifferentialDiff $diff) {
     $aux_fields = DifferentialFieldSelector::newSelector()
       ->getFieldSpecifications();
     foreach ($aux_fields as $key => $aux_field) {
@@ -683,9 +521,42 @@ class DifferentialRevisionViewController extends DifferentialController {
       }
     }
 
-    return DifferentialAuxiliaryField::loadFromStorage(
+    $aux_fields = DifferentialAuxiliaryField::loadFromStorage(
       $revision,
       $aux_fields);
+
+    $aux_props = array();
+    foreach ($aux_fields as $key => $aux_field) {
+      $aux_field->setDiff($diff);
+      $aux_props[$key] = $aux_field->getRequiredDiffProperties();
     }
 
+    $required_properties = array_mergev($aux_props);
+    $property_map = array();
+    if ($required_properties) {
+      $properties = id(new DifferentialDiffProperty())->loadAllWhere(
+        'diffID = %d AND name IN (%Ls)',
+        $diff->getID(),
+        $required_properties);
+      $property_map = mpull($properties, 'getData', 'getName');
+    }
+
+    foreach ($aux_fields as $key => $aux_field) {
+      // Give each field only the properties it specifically required, and
+      // set 'null' for each requested key which we didn't actually load a
+      // value for (otherwise, getDiffProperty() will throw).
+      if ($aux_props[$key]) {
+        $props = array_select_keys($property_map, $aux_props[$key]) +
+                 array_fill_keys($aux_props[$key], null);
+      } else {
+        $props = array();
+      }
+
+      $aux_field->setDiffProperties($props);
+    }
+
+    return $aux_fields;
+  }
+
+
 }

src/applications/differential/controller/revisionview/__init__.php

@@ -9,8 +9,6 @@
 phutil_require_module('phabricator', 'aphront/response/404');
 phutil_require_module('phabricator', 'applications/differential/constants/action');
 phutil_require_module('phabricator', 'applications/differential/constants/revisionstatus');
-phutil_require_module('phabricator', 'applications/differential/constants/unitstatus');
-phutil_require_module('phabricator', 'applications/differential/constants/unittestresult');
 phutil_require_module('phabricator', 'applications/differential/controller/base');
 phutil_require_module('phabricator', 'applications/differential/field/selector/base');
 phutil_require_module('phabricator', 'applications/differential/parser/changeset');
@@ -30,7 +28,6 @@ phutil_require_module('phabricator', 'applications/differential/view/revisiondet
 phutil_require_module('phabricator', 'applications/differential/view/revisionupdatehistory');
 phutil_require_module('phabricator', 'applications/draft/storage/draft');
 phutil_require_module('phabricator', 'applications/phid/handle/data');
-phutil_require_module('phabricator', 'applications/repository/constants/repositorytype');
 phutil_require_module('phabricator', 'infrastructure/celerity/api');
 phutil_require_module('phabricator', 'infrastructure/env');
 phutil_require_module('phabricator', 'infrastructure/javelin/api');

src/applications/differential/editor/revision/DifferentialRevisionEditor.php

@@ -165,12 +165,25 @@ class DifferentialRevisionEditor {
       if ($revision->getAuthorPHID() === null) {
         $revision->setAuthorPHID($this->getActorPHID());
       }
-
+      if ($revision->getRevertPlan() === null) {
+        $revision->setRevertPlan('');
+      }
+      if ($revision->getBlameRevision() === null) {
+        $revision->setBlameRevision('');
+      }
+      if ($revision->getSummary() === null) {
+        $revision->setSummary('');
+      }
+      if ($revision->getTestPlan() === null) {
+        $revision->setTestPlan('');
+      }
       $revision->save();
     }
 
     $revision->loadRelationships();
 
+    $this->willWriteRevision();
+
     if ($this->reviewers === null) {
       $this->reviewers = $revision->getReviewers();
     }
@@ -368,6 +381,8 @@ class DifferentialRevisionEditor {
 
     $revision->save();
 
+    $this->didWriteRevision();
+
     $event_data = array(
       'revision_id'          => $revision->getID(),
       'revision_phid'        => $revision->getPHID(),
@@ -689,6 +704,17 @@ class DifferentialRevisionEditor {
     }
   }
 
+  private function willWriteRevision() {
+    foreach ($this->auxiliaryFields as $aux_field) {
+      $aux_field->willWriteRevision($this);
+    }
+  }
+
+  private function didWriteRevision() {
+    foreach ($this->auxiliaryFields as $aux_field) {
+      $aux_field->didWriteRevision($this);
+    }
+  }
 
 }
 

src/applications/differential/field/selector/default/DifferentialDefaultFieldSelector.php

@@ -21,10 +21,15 @@ final class DifferentialDefaultFieldSelector
 
   public function getFieldSpecifications() {
     return array(
+      new DifferentialRevisionStatusFieldSpecification(),
       new DifferentialAuthorFieldSpecification(),
+      new DifferentialReviewersFieldSpecification(),
+      new DifferentialCCsFieldSpecification(),
+      new DifferentialUnitFieldSpecification(),
+      new DifferentialLintFieldSpecification(),
+      new DifferentialCommitsFieldSpecification(),
       new DifferentialDependenciesFieldSpecification(),
       new DifferentialManiphestTasksFieldSpecification(),
-      new DifferentialCommitsFieldSpecification(),
       new DifferentialHostFieldSpecification(),
       new DifferentialPathFieldSpecification(),
       new DifferentialLinesFieldSpecification(),

src/applications/differential/field/selector/default/__init__.php

@@ -10,13 +10,18 @@ phutil_require_module('phabricator', 'applications/differential/field/selector/b
 phutil_require_module('phabricator', 'applications/differential/field/specification/applypatch');
 phutil_require_module('phabricator', 'applications/differential/field/specification/arcanistproject');
 phutil_require_module('phabricator', 'applications/differential/field/specification/author');
+phutil_require_module('phabricator', 'applications/differential/field/specification/ccs');
 phutil_require_module('phabricator', 'applications/differential/field/specification/commits');
 phutil_require_module('phabricator', 'applications/differential/field/specification/dependencies');
 phutil_require_module('phabricator', 'applications/differential/field/specification/exportpatch');
 phutil_require_module('phabricator', 'applications/differential/field/specification/host');
 phutil_require_module('phabricator', 'applications/differential/field/specification/lines');
+phutil_require_module('phabricator', 'applications/differential/field/specification/lint');
 phutil_require_module('phabricator', 'applications/differential/field/specification/maniphesttasks');
 phutil_require_module('phabricator', 'applications/differential/field/specification/path');
+phutil_require_module('phabricator', 'applications/differential/field/specification/reviewers');
+phutil_require_module('phabricator', 'applications/differential/field/specification/revisionstatus');
+phutil_require_module('phabricator', 'applications/differential/field/specification/unit');
 
 
 phutil_require_source('DifferentialDefaultFieldSelector.php');

src/applications/differential/field/specification/base/DifferentialFieldSpecification.php

@@ -28,7 +28,7 @@
  * @task edit Extending the Revision Edit Interface
  * @task view Extending the Revision View Interface
  * @task conduit Extending the Conduit View Interface
- * @task handles Loading Handles
+ * @task load Loading Additional Data
  * @task context Contextual Data
  */
 abstract class DifferentialFieldSpecification {
@@ -36,6 +36,7 @@ abstract class DifferentialFieldSpecification {
   private $revision;
   private $diff;
   private $handles;
+  private $diffProperties;
 
 
 /* -(  Storage  )------------------------------------------------------------ */
@@ -174,11 +175,34 @@ abstract class DifferentialFieldSpecification {
     return;
   }
 
+  /**
+   * @task edit
+   */
+  public function willWriteRevision(DifferentialRevisionEditor $editor) {
+    return;
+  }
+
+  /**
+   * @task edit
+   */
+  public function didWriteRevision(DifferentialRevisionEditor $editor) {
+    return;
+  }
+
 
 /* -(  Extending the Revision View Interface  )------------------------------ */
 
 
   /**
+   * Determine if this field should appear on the revision detail view
+   * interface. One use of this interface is to add purely informational
+   * fields to the revision view, without any sort of backing storage.
+   *
+   * If you return true from this method, you must implement the methods
+   * @{method:renderLabelForRevisionView} and
+   * @{method:renderValueForRevisionView}.
+   *
+   * @return bool True if this field should appear when viewing a revision.
    * @task view
    */
   public function shouldAppearOnRevisionView() {
@@ -187,6 +211,13 @@ abstract class DifferentialFieldSpecification {
 
 
   /**
+   * Return a string field label which will appear in the revision detail
+   * table.
+   *
+   * You must implement this method if you return true from
+   * @{method:shouldAppearOnRevisionView}.
+   *
+   * @return string Label for field in revision detail view.
    * @task view
    */
   public function renderLabelForRevisionView() {
@@ -195,6 +226,16 @@ abstract class DifferentialFieldSpecification {
 
 
   /**
+   * Return a markup block representing the field for the revision detail
+   * view. Note that you can return null to suppress display (for instance,
+   * if the field shows related objects of some type and the revision doesn't
+   * have any related objects).
+   *
+   * You must implement this method if you return true from
+   * @{method:shouldAppearOnRevisionView}.
+   *
+   * @return string|null Display markup for field value, or null to suppress
+   *                     field rendering.
    * @task view
    */
   public function renderValueForRevisionView() {
@@ -231,7 +272,7 @@ abstract class DifferentialFieldSpecification {
   }
 
 
-/* -(  Loading Handles  )---------------------------------------------------- */
+/* -(  Loading Additional Data  )-------------------------------------------- */
 
 
   /**
@@ -248,7 +289,7 @@ abstract class DifferentialFieldSpecification {
    * You can later retrieve these handles by calling @{method:getHandle}.
    *
    * @return list List of PHIDs to load handles for.
-   * @task handles
+   * @task load
    */
   protected function getRequiredHandlePHIDs() {
     return array();
@@ -263,7 +304,7 @@ abstract class DifferentialFieldSpecification {
    * need.
    *
    * @return list List of PHIDs to load handles for.
-   * @task handles
+   * @task load
    */
   public function getRequiredHandlePHIDsForRevisionView() {
     return $this->getRequiredHandlePHIDs();
@@ -278,13 +319,24 @@ abstract class DifferentialFieldSpecification {
    * need.
    *
    * @return list List of PHIDs to load handles for.
-   * @task handles
+   * @task load
    */
   public function getRequiredHandlePHIDsForEdit() {
     return $this->getRequiredHandlePHIDs();
   }
 
 
+  /**
+   * Specify which diff properties this field needs to load.
+   *
+   * @return list List of diff property keys this field requires.
+   * @task load
+   */
+  public function getRequiredDiffProperties() {
+    return array();
+  }
+
+
 /* -(  Contextual Data  )---------------------------------------------------- */
 
 
@@ -312,6 +364,14 @@ abstract class DifferentialFieldSpecification {
     return $this;
   }
 
+  /**
+   * @task context
+   */
+  final public function setDiffProperties(array $diff_properties) {
+    $this->diffProperties = $diff_properties;
+    return $this;
+  }
+
   /**
    * @task context
    */
@@ -341,6 +401,9 @@ abstract class DifferentialFieldSpecification {
    * @task context
    */
   final protected function getHandle($phid) {
+    if ($this->handles === null) {
+      throw new DifferentialFieldDataNotAvailableException($this);
+    }
     if (empty($this->handles[$phid])) {
       $class = get_class($this);
       throw new Exception(
@@ -351,4 +414,30 @@ abstract class DifferentialFieldSpecification {
     return $this->handles[$phid];
   }
 
+  /**
+   * Get a diff property which this field previously requested by returning
+   * the key from @{method:getRequiredDiffProperties}.
+   *
+   * @param  string      Diff property key.
+   * @return string|null Diff property, or null if the property does not have
+   *                     a value.
+   * @task context
+   */
+  final public function getDiffProperty($key) {
+    if ($this->diffProperties === null) {
+      // This will be set to some (possibly empty) array if we've loaded
+      // properties, so null means diff properties aren't available in this
+      // context.
+      throw new DifferentialFieldDataNotAvailableException($this);
+    }
+    if (!array_key_exists($key, $this->diffProperties)) {
+      $class = get_class($this);
+      throw new Exception(
+        "A differential field (of class '{$class}') is attempting to retrieve ".
+        "a diff property ('{$key}') which it did not request. Return all ".
+        "diff property keys you need from getRequiredDiffProperties().");
+    }
+    return $this->diffProperties[$key];
+  }
+
 }

src/applications/differential/field/specification/ccs/DifferentialCCsFieldSpecification.php

@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+final class DifferentialCCsFieldSpecification
+  extends DifferentialFieldSpecification {
+
+  public function shouldAppearOnRevisionView() {
+    return true;
+  }
+
+  public function getRequiredHandlePHIDsForRevisionView() {
+    return $this->getCCPHIDs();
+  }
+
+  public function renderLabelForRevisionView() {
+    return 'CCs:';
+  }
+
+  public function renderValueForRevisionView() {
+    $cc_phids = $this->getCCPHIDs();
+    if (!$cc_phids) {
+      return '<em>None</em>';
+    }
+
+    $links = array();
+    foreach ($cc_phids as $cc_phid) {
+      $links[] = $this->getHandle($cc_phid)->renderLink();
+    }
+
+    return implode(', ', $links);
+  }
+
+  private function getCCPHIDs() {
+    $revision = $this->getRevision();
+    return $revision->getCCPHIDs();
+  }
+
+}

src/applications/differential/field/specification/ccs/__init__.php

@@ -0,0 +1,12 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phabricator', 'applications/differential/field/specification/base');
+
+
+phutil_require_source('DifferentialCCsFieldSpecification.php');

src/applications/differential/field/specification/lint/DifferentialLintFieldSpecification.php

@@ -0,0 +1,84 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+final class DifferentialLintFieldSpecification
+  extends DifferentialFieldSpecification {
+
+  public function shouldAppearOnRevisionView() {
+    return true;
+  }
+
+  public function renderLabelForRevisionView() {
+    return 'Lint:';
+  }
+
+  public function getRequiredDiffProperties() {
+    return array('arc:lint');
+  }
+
+  public function renderValueForRevisionView() {
+    $diff = $this->getDiff();
+
+    $lstar = DifferentialRevisionUpdateHistoryView::renderDiffLintStar($diff);
+    $lmsg = DifferentialRevisionUpdateHistoryView::getDiffLintMessage($diff);
+    $ldata = $this->getDiffProperty('arc:lint');
+    $ltail = null;
+    if ($ldata) {
+      $ldata = igroup($ldata, 'path');
+      $lint_messages = array();
+      foreach ($ldata as $path => $messages) {
+        $message_markup = array();
+        foreach ($messages as $message) {
+          $path = idx($message, 'path');
+          $line = idx($message, 'line');
+
+          $code = idx($message, 'code');
+          $severity = idx($message, 'severity');
+
+          $name = idx($message, 'name');
+          $description = idx($message, 'description');
+
+          $message_markup[] =
+            '<li>'.
+              '<span class="lint-severity-'.phutil_escape_html($severity).'">'.
+                phutil_escape_html(ucwords($severity)).
+              '</span>'.
+              ' '.
+              '('.phutil_escape_html($code).') '.
+              phutil_escape_html($name).
+              ' at line '.phutil_escape_html($line).
+              '<p>'.phutil_escape_html($description).'</p>'.
+            '</li>';
+        }
+        $lint_messages[] =
+          '<li class="lint-file-block">'.
+            'Lint for <strong>'.phutil_escape_html($path).'</strong>'.
+            '<ul>'.implode("\n", $message_markup).'</ul>'.
+          '</li>';
+      }
+      $ltail =
+        '<div class="differential-lint-block">'.
+          '<ul>'.
+            implode("\n", $lint_messages).
+          '</ul>'.
+        '</div>';
+    }
+
+    return $lstar.' '.$lmsg.$ltail;
+  }
+}

src/applications/differential/field/specification/lint/__init__.php

@@ -0,0 +1,16 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phabricator', 'applications/differential/field/specification/base');
+phutil_require_module('phabricator', 'applications/differential/view/revisionupdatehistory');
+
+phutil_require_module('phutil', 'markup');
+phutil_require_module('phutil', 'utils');
+
+
+phutil_require_source('DifferentialLintFieldSpecification.php');

src/applications/differential/field/specification/reviewers/DifferentialReviewersFieldSpecification.php

@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+final class DifferentialReviewersFieldSpecification
+  extends DifferentialFieldSpecification {
+
+  public function shouldAppearOnRevisionView() {
+    return true;
+  }
+
+  public function getRequiredHandlePHIDsForRevisionView() {
+    return $this->getReviewerPHIDs();
+  }
+
+  public function renderLabelForRevisionView() {
+    return 'Reviewers:';
+  }
+
+  public function renderValueForRevisionView() {
+    $reviewer_phids = $this->getReviewerPHIDs();
+    if (!$reviewer_phids) {
+      return '<em>None</em>';
+    }
+
+    $links = array();
+    foreach ($reviewer_phids as $reviewer_phid) {
+      $links[] = $this->getHandle($reviewer_phid)->renderLink();
+    }
+
+    return implode(', ', $links);
+  }
+
+  private function getReviewerPHIDs() {
+    $revision = $this->getRevision();
+    return $revision->getReviewers();
+  }
+
+}

src/applications/differential/field/specification/reviewers/__init__.php

@@ -0,0 +1,12 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phabricator', 'applications/differential/field/specification/base');
+
+
+phutil_require_source('DifferentialReviewersFieldSpecification.php');

src/applications/differential/field/specification/revisionstatus/DifferentialRevisionStatusFieldSpecification.php

@@ -0,0 +1,55 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+final class DifferentialRevisionStatusFieldSpecification
+  extends DifferentialFieldSpecification {
+
+  public function shouldAppearOnRevisionView() {
+    return true;
+  }
+
+  public function renderLabelForRevisionView() {
+    return 'Revision Status:';
+  }
+
+  public function renderValueForRevisionView() {
+    $revision = $this->getRevision();
+    $diff = $this->getDiff();
+
+    $status = $revision->getStatus();
+    $next_step = null;
+    if ($status == DifferentialRevisionStatus::ACCEPTED) {
+      switch ($diff->getSourceControlSystem()) {
+        case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
+          $next_step = 'arc amend --revision '.$revision->getID();
+          break;
+        case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
+          $next_step = 'arc commit --revision '.$revision->getID();
+          break;
+      }
+      if ($next_step) {
+        $next_step =
+          ' &middot; '.
+          'Next step: <tt>'.phutil_escape_html($next_step).'</tt>';
+      }
+    }
+    $status = DifferentialRevisionStatus::getNameForRevisionStatus($status);
+    return '<strong>'.$status.'</strong>'.$next_step;
+  }
+
+}

src/applications/differential/field/specification/revisionstatus/__init__.php

@@ -0,0 +1,16 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phabricator', 'applications/differential/constants/revisionstatus');
+phutil_require_module('phabricator', 'applications/differential/field/specification/base');
+phutil_require_module('phabricator', 'applications/repository/constants/repositorytype');
+
+phutil_require_module('phutil', 'markup');
+
+
+phutil_require_source('DifferentialRevisionStatusFieldSpecification.php');

src/applications/differential/field/specification/unit/DifferentialUnitFieldSpecification.php

@@ -0,0 +1,88 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+final class DifferentialUnitFieldSpecification
+  extends DifferentialFieldSpecification {
+
+  public function shouldAppearOnRevisionView() {
+    return true;
+  }
+
+  public function renderLabelForRevisionView() {
+    return 'Unit:';
+  }
+
+  public function getRequiredDiffProperties() {
+    return array('arc:unit');
+  }
+
+  public function renderValueForRevisionView() {
+    $diff = $this->getDiff();
+
+    $ustar = DifferentialRevisionUpdateHistoryView::renderDiffUnitStar($diff);
+    $umsg = DifferentialRevisionUpdateHistoryView::getDiffUnitMessage($diff);
+
+    $postponed_count = 0;
+    $udata = $this->getDiffProperty('arc:unit');
+    $utail = null;
+
+    if ($udata) {
+      $unit_messages = array();
+      foreach ($udata as $test) {
+        $name = phutil_escape_html(idx($test, 'name'));
+        $result = phutil_escape_html(idx($test, 'result'));
+
+        if ($result != DifferentialUnitTestResult::RESULT_POSTPONED &&
+            $result != DifferentialUnitTestResult::RESULT_PASS) {
+          $userdata = phutil_escape_html(idx($test, 'userdata'));
+          if (strlen($userdata) > 256) {
+            $userdata = substr($userdata, 0, 256).'...';
+          }
+          $userdata = str_replace("\n", '<br />', $userdata);
+          $unit_messages[] =
+            '<tr>'.
+            '<th>'.$name.'</th>'.
+            '<th class="unit-test-result">'.
+            '<div class="result-'.$result.'">'.
+            strtoupper($result).
+            '</div>'.
+            '</th>'.
+            '<td>'.$userdata.'</td>'.
+            '</tr>';
+
+          $utail =
+            '<div class="differential-unit-block">'.
+            '<table class="differential-unit-table">'.
+            implode("\n", $unit_messages).
+            '</table>'.
+            '</div>';
+        } else if ($result == DifferentialUnitTestResult::RESULT_POSTPONED) {
+          $postponed_count++;
+        }
+      }
+    }
+
+    if ($postponed_count > 0 &&
+        $diff->getUnitStatus() == DifferentialUnitStatus::UNIT_POSTPONED) {
+      $umsg = $postponed_count.' '.$umsg;
+    }
+
+    return $ustar.' '.$umsg.$utail;
+  }
+
+}

src/applications/differential/field/specification/unit/__init__.php

@@ -0,0 +1,18 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phabricator', 'applications/differential/constants/unitstatus');
+phutil_require_module('phabricator', 'applications/differential/constants/unittestresult');
+phutil_require_module('phabricator', 'applications/differential/field/specification/base');
+phutil_require_module('phabricator', 'applications/differential/view/revisionupdatehistory');
+
+phutil_require_module('phutil', 'markup');
+phutil_require_module('phutil', 'utils');
+
+
+phutil_require_source('DifferentialUnitFieldSpecification.php');