Show first 10 branches, then "More Branches" for commits on huge numbers of branches

Summary: Fixes T9562. We already do this for tags, but didn't have similar logic for branches. Implement that logic.

Test Plan:
  - Set limit to 1, saw "More branches", clicked it, got the correct results.
  - Verified that branch table with no specified commit still works properly.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9562

Differential Revision: https://secure.phabricator.com/D15284

src/applications/diffusion/controller/DiffusionCommitBranchesController.php

@@ -15,20 +15,18 @@ final class DiffusionCommitBranchesController extends DiffusionController {
     $drequest = $this->getDiffusionRequest();
     $repository = $drequest->getRepository();
 
-    switch ($repository->getVersionControlSystem()) {
-      case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
-        $branches = array();
-        break;
-      default:
-        $branches = $this->callConduitWithDiffusionRequest(
-          'diffusion.branchquery',
-          array(
-            'contains' => $drequest->getCommit(),
-          ));
-        break;
-    }
+    $branch_limit = 10;
+    $branches = DiffusionRepositoryRef::loadAllFromDictionaries(
+      $this->callConduitWithDiffusionRequest(
+        'diffusion.branchquery',
+        array(
+          'contains' => $drequest->getCommit(),
+          'limit' => $branch_limit + 1,
+        )));
+
+    $has_more_branches = (count($branches) > $branch_limit);
+    $branches = array_slice($branches, 0, $branch_limit);
 
-    $branches = DiffusionRepositoryRef::loadAllFromDictionaries($branches);
     $branch_links = array();
     foreach ($branches as $branch) {
       $branch_links[] = phutil_tag(
@@ -43,6 +41,18 @@ final class DiffusionCommitBranchesController extends DiffusionController {
         $branch->getShortName());
     }
 
+    if ($has_more_branches) {
+      $branch_links[] = phutil_tag(
+        'a',
+        array(
+          'href' => $drequest->generateURI(
+            array(
+              'action'  => 'branches',
+            )),
+        ),
+        pht("More Branches\xE2\x80\xA6"));
+    }
+
     return id(new AphrontAjaxResponse())
       ->setContent($branch_links ? implode(', ', $branch_links) : pht('None'));
   }