Use transaction diffs to show description changes in Pholio

Summary: Fixes T2659. These didn't exist until recently.

Test Plan: {F34556}

Reviewers: chad

Reviewed By: chad

CC: aran

Maniphest Tasks: T2659

Differential Revision: https://secure.phabricator.com/D5221

src/applications/config/storage/PhabricatorConfigTransaction.php

@@ -85,15 +85,13 @@ final class PhabricatorConfigTransaction
     if ($old['deleted']) {
       $old_text = '';
     } else {
-      // NOTE: Here and below, we're adding a synthetic "\n" to prevent the
-      // differ from complaining about missing trailing newlines.
-      $old_text = PhabricatorConfigJSON::prettyPrintJSON($old['value'])."\n";
+      $old_text = PhabricatorConfigJSON::prettyPrintJSON($old['value']);
     }
 
     if ($new['deleted']) {
       $new_text = '';
     } else {
-      $new_text = PhabricatorConfigJSON::prettyPrintJSON($new['value'])."\n";
+      $new_text = PhabricatorConfigJSON::prettyPrintJSON($new['value']);
     }
 
     $view = id(new PhabricatorApplicationTransactionTextDiffDetailView())

src/applications/pholio/storage/PholioTransaction.php

@@ -49,10 +49,8 @@ final class PholioTransaction extends PhabricatorApplicationTransaction {
         break;
       case PholioTransactionType::TYPE_DESCRIPTION:
         return pht(
-          '%s updated the description of this mock. '.
-          'The old description was: %s',
-          $this->renderHandleLink($author_phid),
-          $old);
+          "%s updated the mock's description.",
+          $this->renderHandleLink($author_phid));
         break;
       case PholioTransactionType::TYPE_INLINE:
         return pht(
@@ -63,5 +61,25 @@ final class PholioTransaction extends PhabricatorApplicationTransaction {
     return parent::getTitle();
   }
 
+  public function hasChangeDetails() {
+    switch ($this->getTransactionType()) {
+      case PholioTransactionType::TYPE_DESCRIPTION:
+        return true;
+    }
+    return parent::hasChangeDetails();
+  }
+
+  public function renderChangeDetails(PhabricatorUser $viewer) {
+    $old = $this->getOldValue();
+    $new = $this->getNewValue();
+
+    $view = id(new PhabricatorApplicationTransactionTextDiffDetailView())
+      ->setUser($viewer)
+      ->setOldText($old)
+      ->setNewText($new);
+
+    return $view->render();
+  }
+
 
 }

src/applications/transactions/view/PhabricatorApplicationTransactionTextDiffDetailView.php

@@ -23,10 +23,15 @@ final class PhabricatorApplicationTransactionTextDiffDetailView
     // TODO: On mobile, or perhaps by default, we should switch to 1-up once
     // that is built.
 
-    $old = phutil_utf8_hard_wrap($old, 80);
-    $old = implode("\n", $old);
-    $new = phutil_utf8_hard_wrap($new, 80);
-    $new = implode("\n", $new);
+    if (strlen($old)) {
+      $old = phutil_utf8_hard_wrap($old, 80);
+      $old = implode("\n", $old)."\n";
+    }
+
+    if (strlen($new)) {
+      $new = phutil_utf8_hard_wrap($new, 80);
+      $new = implode("\n", $new)."\n";
+    }
 
     $engine = new PhabricatorDifferenceEngine();
     $changeset = $engine->generateChangesetFromFileContent($old, $new);