Make some remarkup handling in Config cleaner, fixing {{other.option} links

Summary:
Depends on D19609. Ref T13189. At some point, we switched from RemarkupEngine to RemarkupView and lost this piece of hack-magic.

Restore the hack-magic. It's still hack-magic instead of a real rule, but things are at least cleaner than they were before.

Test Plan: Viewed `auth.require-approval`, etc. Saw references to other config options linked properly.

Reviewers: amckinley

Maniphest Tasks: T13189

Differential Revision: https://secure.phabricator.com/D19610

src/__phutil_library_map__.php

@@ -8290,10 +8290,7 @@ phutil_register_library_map(array(
     'PhabricatorConfigManualActivity' => 'PhabricatorConfigEntryDAO',
     'PhabricatorConfigModule' => 'Phobject',
     'PhabricatorConfigModuleController' => 'PhabricatorConfigController',
-    'PhabricatorConfigOption' => array(
-      'Phobject',
-      'PhabricatorMarkupInterface',
-    ),
+    'PhabricatorConfigOption' => 'Phobject',
     'PhabricatorConfigOptionType' => 'Phobject',
     'PhabricatorConfigPHIDModule' => 'PhabricatorConfigModule',
     'PhabricatorConfigProxySource' => 'PhabricatorConfigSource',

src/applications/config/controller/PhabricatorConfigEditController.php

@@ -153,30 +153,16 @@ final class PhabricatorConfigEditController
         $e_value);
     }
 
-    $engine = new PhabricatorMarkupEngine();
-    $engine->setViewer($viewer);
-    $engine->addObject($option, 'description');
-    $engine->process();
-    $description = phutil_tag(
-      'div',
-      array(
-        'class' => 'phabricator-remarkup',
-      ),
-      $engine->getOutput($option, 'description'));
-
     $form
       ->setUser($viewer)
       ->addHiddenInput('issue', $request->getStr('issue'));
 
-    $description = $option->getDescription();
-    if (strlen($description)) {
-      $description_view = new PHUIRemarkupView($viewer, $description);
-
-      $form
-        ->appendChild(
-          id(new AphrontFormMarkupControl())
-            ->setLabel(pht('Description'))
-            ->setValue($description_view));
+    $description = $option->newDescriptionRemarkupView($viewer);
+    if ($description) {
+      $form->appendChild(
+        id(new AphrontFormMarkupControl())
+          ->setLabel(pht('Description'))
+          ->setValue($description));
     }
 
     if ($group) {

src/applications/config/option/PhabricatorConfigOption.php

@@ -1,8 +1,7 @@
 <?php
 
 final class PhabricatorConfigOption
-  extends Phobject
-  implements PhabricatorMarkupInterface {
+  extends Phobject {
 
   private $key;
   private $default;
@@ -204,43 +203,19 @@ final class PhabricatorConfigOption
     return $this;
   }
 
-/* -(  PhabricatorMarkupInterface  )----------------------------------------- */
-
-  public function getMarkupFieldKey($field) {
-    return $this->getKey().':'.$field;
-  }
-
-  public function newMarkupEngine($field) {
-    return PhabricatorMarkupEngine::newMarkupEngine(array());
-  }
-
-  public function getMarkupText($field) {
-    switch ($field) {
-      case 'description':
-        $text = $this->getDescription();
-        break;
-      case 'summary':
-        $text = $this->getSummary();
-        break;
+  public function newDescriptionRemarkupView(PhabricatorUser $viewer) {
+    $description = $this->getDescription();
+    if (!strlen($description)) {
+      return null;
     }
 
-    // TODO: We should probably implement this as a real Markup rule, but
-    // markup rules are a bit of a mess right now and it doesn't hurt us to
-    // fake this.
-    $text = preg_replace(
+    // TODO: Some day, we should probably implement this as a real rule.
+    $description = preg_replace(
       '/{{([^}]+)}}/',
       '[[/config/edit/\\1/ | \\1]]',
-      $text);
+      $description);
 
-    return $text;
-  }
-
-  public function didMarkupText($field, $output, PhutilMarkupEngine $engine) {
-    return $output;
-  }
-
-  public function shouldUseMarkupCache($field) {
-    return false;
+    return new PHUIRemarkupView($viewer, $description);
   }
 
 }