phabricator basic stgit compatibility

gistfile1.diff

diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index ba7adb4..8c4031c 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -157,6 +157,7 @@ phutil_register_library_map(array(
     'ArcanistSpellingDefaultData' => 'lint/linter/spelling/ArcanistSpellingDefaultData.php',
     'ArcanistSpellingLinter' => 'lint/linter/ArcanistSpellingLinter.php',
     'ArcanistSpellingLinterTestCase' => 'lint/linter/__tests__/ArcanistSpellingLinterTestCase.php',
+    'ArcanistStgitAPI' => 'repository/api/ArcanistStgitAPI.php',
     'ArcanistSubversionAPI' => 'repository/api/ArcanistSubversionAPI.php',
     'ArcanistSubversionHookAPI' => 'repository/hookapi/ArcanistSubversionHookAPI.php',
     'ArcanistSvnHookPreCommitWorkflow' => 'workflow/ArcanistSvnHookPreCommitWorkflow.php',
@@ -323,6 +324,7 @@ phutil_register_library_map(array(
     'ArcanistSingleLintEngine' => 'ArcanistLintEngine',
     'ArcanistSpellingLinter' => 'ArcanistLinter',
     'ArcanistSpellingLinterTestCase' => 'ArcanistArcanistLinterTestCase',
+    'ArcanistStgitAPI' => 'ArcanistGitAPI',
     'ArcanistSubversionAPI' => 'ArcanistRepositoryAPI',
     'ArcanistSubversionHookAPI' => 'ArcanistHookAPI',
     'ArcanistSvnHookPreCommitWorkflow' => 'ArcanistBaseWorkflow',
diff --git a/src/repository/api/ArcanistGitAPI.php b/src/repository/api/ArcanistGitAPI.php
index 45bae42..f2d973a 100644
--- a/src/repository/api/ArcanistGitAPI.php
+++ b/src/repository/api/ArcanistGitAPI.php
@@ -5,7 +5,7 @@
  *
  * @group workingcopy
  */
-final class ArcanistGitAPI extends ArcanistRepositoryAPI {
+class ArcanistGitAPI extends ArcanistRepositoryAPI {

   private $repositoryHasNoCommits = false;
   const SEARCH_LENGTH_FOR_PARENT_REVISIONS = 16;
diff --git a/src/repository/api/ArcanistRepositoryAPI.php b/src/repository/api/ArcanistRepositoryAPI.php
index 69a89b5..191c8c4 100644
--- a/src/repository/api/ArcanistRepositoryAPI.php
+++ b/src/repository/api/ArcanistRepositoryAPI.php
@@ -76,7 +76,13 @@ abstract class ArcanistRepositoryAPI {
         $api = new ArcanistMercurialAPI($root);
         break;
       case 'git':
-        $api = new ArcanistGitAPI($root);
+        list($code, $out, $err) = exec_manual('stg series');
+        if ($code == 0) {
+          echo "using stg\n";
+          $api = new ArcanistStgitAPI($root);
+        } else {
+          $api = new ArcanistGitAPI($root);
+        }
         break;
       default:
         throw new Exception(