Differential - add unit and lint information to diff view

Summary:
see title. Note that fields that use customs storage don't work because I didn't think it made sense to load a revision object to get that data. Further, we don't have a revision id at some points, so its not clear what does / does not work...?

Also added a link to upsell this diff view as I had trouble finding it.

Test Plan: viewed some diffs

Reviewers: epriestley, vrana

Reviewed By: epriestley

CC: chad, aran, Korvin

Maniphest Tasks: T2026

Differential Revision: https://secure.phabricator.com/D3962

src/applications/differential/controller/DifferentialDiffViewController.php

@@ -83,10 +83,38 @@ final class DifferentialDiffViewController extends DifferentialController {
       $top_panel = $action_panel;
     }
 
-    $arc_unit = id(new DifferentialDiffProperty())->loadOneWhere(
-      'diffID = %d and name = %s',
-      $this->id,
-      'arc:unit');
+    $props = id(new DifferentialDiffProperty())->loadAllWhere(
+      'diffID = %d',
+      $diff->getID());
+    $props = mpull($props, 'getData', 'getName');
+
+    $aux_fields = DifferentialFieldSelector::newSelector()
+      ->getFieldSpecifications();
+    foreach ($aux_fields as $key => $aux_field) {
+      if (!$aux_field->shouldAppearOnDiffView()) {
+        unset($aux_fields[$key]);
+      } else {
+        $aux_field->setUser($this->getRequest()->getUser());
+      }
+    }
+
+    $dict = array();
+    foreach ($aux_fields as $key => $aux_field) {
+      $aux_field->setDiff($diff);
+      $aux_field->setManualDiff($diff);
+      $aux_field->setDiffProperties($props);
+      $value = $aux_field->renderValueForDiffView();
+      if (strlen($value)) {
+        $label = rtrim($aux_field->renderLabelForDiffView(), ':');
+        $dict[$label] = $value;
+      }
+    }
+
+    $action_panel = new AphrontHeadsupView();
+    $action_panel->setProperties($dict);
+    $action_panel->setHeader(pht('Diff Properties'));
+
+    $arc_unit = idx($props, 'arc:unit');
     if ($arc_unit) {
       $test_data = array($arc_unit->getName() => $arc_unit->getData());
     } else {
@@ -120,6 +148,7 @@ final class DifferentialDiffViewController extends DifferentialController {
         ->appendChild(
           array(
             $top_panel->render(),
+            $action_panel->render(),
             $table_of_contents->render(),
             $details->render(),
           )),

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

@@ -338,6 +338,63 @@ abstract class DifferentialFieldSpecification {
   }
 
 
+/* -(  Extending the Diff View Interface  )------------------------------ */
+
+
+  /**
+   * Determine if this field should appear on the diff detail view
+   * interface. One use of this interface is to add purely informational
+   * fields to the diff view, without any sort of backing storage.
+   *
+   * NOTE: These diffs are not necessarily attached yet to a revision.
+   * As such, a field on the diff view can not rely on the existence of a
+   * revision or use storage attached to the revision.
+   *
+   * If you return true from this method, you must implement the methods
+   * @{method:renderLabelForDiffView} and
+   * @{method:renderValueForDiffView}.
+   *
+   * @return bool True if this field should appear when viewing a diff.
+   * @task view
+   */
+  public function shouldAppearOnDiffView() {
+    return false;
+  }
+
+
+  /**
+   * Return a string field label which will appear in the diff detail
+   * table.
+   *
+   * You must implement this method if you return true from
+   * @{method:shouldAppearOnDiffView}.
+   *
+   * @return string Label for field in revision detail view.
+   * @task view
+   */
+  public function renderLabelForDiffView() {
+    throw new DifferentialFieldSpecificationIncompleteException($this);
+  }
+
+
+  /**
+   * Return a markup block representing the field for the diff detail
+   * view. Note that you can return null to suppress display (for instance,
+   * if the field shows related objects of some type and the revision doesn't
+   * have any related objects).
+   *
+   * You must implement this method if you return true from
+   * @{method:shouldAppearOnDiffView}.
+   *
+   * @return string|null Display markup for field value, or null to suppress
+   *                     field rendering.
+   * @task view
+   */
+  public function renderValueForDiffView() {
+    throw new DifferentialFieldSpecificationIncompleteException($this);
+  }
+
+
 /* -(  Extending the E-mail Interface  )------------------------------------- */
 
 

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

@@ -3,6 +3,17 @@
 final class DifferentialLintFieldSpecification
   extends DifferentialFieldSpecification {
 
+  public function shouldAppearOnDiffView() {
+      return true;
+  }
+
+  public function renderLabelForDiffView() {
+    return $this->renderLabelForRevisionView();
+  }
+
+  public function renderValueForDiffView() {
+    return $this->renderValueForRevisionView();
+  }
   public function shouldAppearOnRevisionView() {
     return true;
   }

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

@@ -3,6 +3,18 @@
 final class DifferentialUnitFieldSpecification
   extends DifferentialFieldSpecification {
 
+  public function shouldAppearOnDiffView() {
+      return true;
+  }
+
+  public function renderLabelForDiffView() {
+    return $this->renderLabelForRevisionView();
+  }
+
+  public function renderValueForDiffView() {
+    return $this->renderValueForRevisionView();
+  }
+
   public function shouldAppearOnRevisionView() {
     return true;
   }

src/applications/differential/view/DifferentialRevisionUpdateHistoryView.php

@@ -155,10 +155,14 @@ final class DifferentialRevisionUpdateHistoryView extends AphrontView {
       }
       $last_base = $base;
 
+      $id_link = phutil_render_tag(
+        'a',
+        array('href' => '/differential/diff/'.$id.'/'),
+        phutil_escape_html($id));
       $rows[] =
         '<tr'.$class.'>'.
           '<td class="revhistory-name">'.phutil_escape_html($name).'</td>'.
-          '<td class="revhistory-id">'.phutil_escape_html($id).'</td>'.
+          '<td class="revhistory-id">'.$id_link.'</td>'.
           '<td class="revhistory-base">'.phutil_escape_html($base).'</td>'.
           '<td class="revhistory-desc">'.phutil_escape_html($desc).'</td>'.
           '<td class="revhistory-age">'.$age.'</td>'.