Pholio - make create stories include the mock description, if there is one.

Summary:
This diff accomplishes this task by adding an arbitrary metadata store to PhabricatorObjectHandle. This seemed like it would be "necessary eventually"; for example if / when we decide we want to show images in these stories we'd need to add some more arbitrary data. A point of debate is this technique will yield the _current_ data and not the data at the time the transaction was originally made. I can see this being both desirable and non-desirable.

Otherwise, the best way to do this is to make a new transaction type specifically for create and store exactly what data we think we would need.

(and there's probably many other ways but they require much more work...)

Test Plan: viewed some pholio create stories and yes, they had the description showing.

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, aran

Maniphest Tasks: T3685

Differential Revision: https://secure.phabricator.com/D6767

src/applications/pholio/storage/PholioTransaction.php

@@ -250,15 +250,26 @@ final class PholioTransaction extends PhabricatorApplicationTransaction {
     return parent::getTitleForFeed();
   }
 
-  public function getBodyForFeed() {
+  public function getBodyForFeed(PhabricatorFeedStory $story) {
+    $text = null;
     switch ($this->getTransactionType()) {
+      case PholioTransactionType::TYPE_NAME:
+        if ($this->getOldValue() === null) {
+          $mock = $story->getPrimaryObject();
+          $text = $mock->getDescription();
+        }
+        break;
       case PholioTransactionType::TYPE_INLINE:
         $text = $this->getComment()->getContent();
-        return phutil_escape_html_newlines(
-          phutil_utf8_shorten($text, 128));
         break;
     }
-    return parent::getBodyForFeed();
+
+    if ($text) {
+      return phutil_escape_html_newlines(
+        phutil_utf8_shorten($text, 128));
+    }
+
+    return parent::getBodyForFeed($story);
   }
 
   public function hasChangeDetails() {

src/applications/transactions/feed/PhabricatorApplicationTransactionFeedStory.php

@@ -44,8 +44,9 @@ class PhabricatorApplicationTransactionFeedStory
 
     $xaction->setHandles($this->getHandles());
     $view->setTitle($xaction->getTitleForFeed());
-    if (nonempty($xaction->getBodyForFeed())) {
-      $view->appendChild($xaction->getBodyForFeed());
+    $body = $xaction->getBodyForFeed($this);
+    if (nonempty($body)) {
+      $view->appendChild($body);
     }
 
     $view->setImage(

src/applications/transactions/storage/PhabricatorApplicationTransaction.php

@@ -383,7 +383,7 @@ abstract class PhabricatorApplicationTransaction
     return $this->getTitle();
   }
 
-  public function getBodyForFeed() {
+  public function getBodyForFeed(PhabricatorFeedStory $story) {
     $old = $this->getOldValue();
     $new = $this->getNewValue();