Allow commits to be queried by repository using the tagged(...) typehaead function

Summary:
Fixes T12322. Allows you to search for commits using the `tagged(...)` repository function, so you can find "any commmit in any repository tagged with android" or similar.

I moved the function from Differential (which was the application using it) to Diffusion (which is more accurately the application which provides it).

I fixed a bug where searching for `tagged(xyz)` would have no effect (constraint was ignored) if there were no repositories tagged with "xyz". The fix isn't perfectly clean, but should work properly for the moment.

Test Plan:
  - Searched with `tagged(...)` in Diffusion and Differential.
  - Searched by repository.
  - Searched with `tagged(...)` for a project with no tagged repositories.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12322

Differential Revision: https://secure.phabricator.com/D17426

src/__phutil_library_map__.php

@@ -482,7 +482,6 @@ phutil_register_library_map(array(
     'DifferentialReleephRequestFieldSpecification' => 'applications/releeph/differential/DifferentialReleephRequestFieldSpecification.php',
     'DifferentialRemarkupRule' => 'applications/differential/remarkup/DifferentialRemarkupRule.php',
     'DifferentialReplyHandler' => 'applications/differential/mail/DifferentialReplyHandler.php',
-    'DifferentialRepositoryDatasource' => 'applications/differential/typeahead/DifferentialRepositoryDatasource.php',
     'DifferentialRepositoryField' => 'applications/differential/customfield/DifferentialRepositoryField.php',
     'DifferentialRepositoryLookup' => 'applications/differential/query/DifferentialRepositoryLookup.php',
     'DifferentialRequiredSignaturesField' => 'applications/differential/customfield/DifferentialRequiredSignaturesField.php',
@@ -827,6 +826,7 @@ phutil_register_library_map(array(
     'DiffusionRepositoryEditDeleteController' => 'applications/diffusion/controller/DiffusionRepositoryEditDeleteController.php',
     'DiffusionRepositoryEditEngine' => 'applications/diffusion/editor/DiffusionRepositoryEditEngine.php',
     'DiffusionRepositoryEditUpdateController' => 'applications/diffusion/controller/DiffusionRepositoryEditUpdateController.php',
+    'DiffusionRepositoryFunctionDatasource' => 'applications/diffusion/typeahead/DiffusionRepositoryFunctionDatasource.php',
     'DiffusionRepositoryHistoryManagementPanel' => 'applications/diffusion/management/DiffusionRepositoryHistoryManagementPanel.php',
     'DiffusionRepositoryListController' => 'applications/diffusion/controller/DiffusionRepositoryListController.php',
     'DiffusionRepositoryManageController' => 'applications/diffusion/controller/DiffusionRepositoryManageController.php',
@@ -5211,7 +5211,6 @@ phutil_register_library_map(array(
     'DifferentialReleephRequestFieldSpecification' => 'Phobject',
     'DifferentialRemarkupRule' => 'PhabricatorObjectRemarkupRule',
     'DifferentialReplyHandler' => 'PhabricatorApplicationTransactionReplyHandler',
-    'DifferentialRepositoryDatasource' => 'PhabricatorTypeaheadCompositeDatasource',
     'DifferentialRepositoryField' => 'DifferentialCoreCustomField',
     'DifferentialRepositoryLookup' => 'Phobject',
     'DifferentialRequiredSignaturesField' => 'DifferentialCoreCustomField',
@@ -5575,6 +5574,7 @@ phutil_register_library_map(array(
     'DiffusionRepositoryEditDeleteController' => 'DiffusionRepositoryManageController',
     'DiffusionRepositoryEditEngine' => 'PhabricatorEditEngine',
     'DiffusionRepositoryEditUpdateController' => 'DiffusionRepositoryManageController',
+    'DiffusionRepositoryFunctionDatasource' => 'PhabricatorTypeaheadCompositeDatasource',
     'DiffusionRepositoryHistoryManagementPanel' => 'DiffusionRepositoryManagementPanel',
     'DiffusionRepositoryListController' => 'DiffusionController',
     'DiffusionRepositoryManageController' => 'DiffusionController',

src/applications/audit/query/PhabricatorCommitSearchEngine.php

@@ -85,7 +85,7 @@ final class PhabricatorCommitSearchEngine
         ->setKey('repositoryPHIDs')
         ->setConduitKey('repositories')
         ->setAliases(array('repository', 'repositories', 'repositoryPHID'))
-        ->setDatasource(new DiffusionRepositoryDatasource()),
+        ->setDatasource(new DiffusionRepositoryFunctionDatasource()),
       id(new PhabricatorSearchDatasourceField())
         ->setLabel(pht('Packages'))
         ->setKey('packagePHIDs')

src/applications/differential/query/DifferentialRevisionSearchEngine.php

@@ -75,7 +75,7 @@ final class DifferentialRevisionSearchEngine
         ->setLabel(pht('Repositories'))
         ->setKey('repositoryPHIDs')
         ->setAliases(array('repository', 'repositories', 'repositoryPHID'))
-        ->setDatasource(new DifferentialRepositoryDatasource())
+        ->setDatasource(new DiffusionRepositoryFunctionDatasource())
         ->setDescription(
           pht('Find revisions from specific repositories.')),
       id(new PhabricatorSearchSelectField())

src/applications/diffusion/typeahead/DiffusionRepositoryFunctionDatasource.php

@@ -1,6 +1,6 @@
 <?php
 
-final class DifferentialRepositoryDatasource
+final class DiffusionRepositoryFunctionDatasource
   extends PhabricatorTypeaheadCompositeDatasource {
 
   public function getBrowseTitle() {

src/applications/diffusion/typeahead/DiffusionTaggedRepositoriesFunctionDatasource.php

@@ -67,11 +67,19 @@ final class DiffusionTaggedRepositoriesFunctionDatasource
       ->execute();
 
     $results = array();
-
     foreach ($repositories as $repository) {
       $results[] = $repository->getPHID();
     }
 
+    if (!$results) {
+      // TODO: This is a little hacky, but if you query for "tagged(x)" and
+      // there are no such repositories, we want to match nothing. If we
+      // just return `array()`, that gets evaluated as "no constraint" and
+      // we match everything. This works correctly for now, but should be
+      // replaced with some more elegant/general approach eventually.
+      $results[] = PhabricatorPHIDConstants::PHID_VOID;
+    }
+
     return $results;
   }