Add repo option to autoupdate

pre_commit/commands/autoupdate.py

@@ -106,7 +106,7 @@ def _write_new_config_file(path, output):
         f.write(to_write)
 
 
-def autoupdate(runner, tags_only):
+def autoupdate(runner, tags_only, repo=None):
     """Auto-update the pre-commit config to the latest versions of repos."""
     migrate_config(runner, quiet=True)
     retv = 0
@@ -116,6 +116,10 @@ def autoupdate(runner, tags_only):
     input_config = load_config(runner.config_file_path)
 
     for repo_config in input_config['repos']:
+        # Skip any repo_configs that aren't the specified repo
+        if repo and repo != repo_config['repo']:
+            continue
+
         if is_local_repo(repo_config) or is_meta_repo(repo_config):
             output_repos.append(repo_config)
             continue

pre_commit/main.py

@@ -167,6 +167,12 @@ def main(argv=None):
             'tagged version (the default behavior).'
         ),
     )
+    autoupdate_parser.add_argument(
+        '--repo', nargs=1, default=None,
+        help=(
+            'Repository to update the hooks of.'
+        ),
+    )
 
     migrate_config_parser = subparsers.add_parser(
         'migrate-config',
@@ -245,7 +251,11 @@ def main(argv=None):
         elif args.command == 'autoupdate':
             if args.tags_only:
                 logger.warning('--tags-only is the default')
-            return autoupdate(runner, tags_only=not args.bleeding_edge)
+            return autoupdate(
+                runner,
+                tags_only=not args.bleeding_edge,
+                repo=args.repo,
+            )
         elif args.command == 'migrate-config':
             return migrate_config(runner)
         elif args.command == 'run':

tests/commands/autoupdate_test.py

@@ -114,8 +114,11 @@ def test_autoupdate_out_of_date_repo(
     )
     write_config('.', config)
 
+    runner = Runner('.', C.CONFIG_FILE)
     before = open(C.CONFIG_FILE).read()
-    ret = autoupdate(Runner('.', C.CONFIG_FILE), tags_only=False)
+    repo_name = 'file://{}'.format(out_of_date_repo.path)
+    # It will update the repo, because the name matches
+    ret = autoupdate(runner, tags_only=False, repo=repo_name)
     after = open(C.CONFIG_FILE).read()
     assert ret == 0
     assert before != after
@@ -124,6 +127,24 @@ def test_autoupdate_out_of_date_repo(
     assert out_of_date_repo.head_sha in after
 
 
+def test_autoupdate_out_of_date_repo_wrong_repo_name(
+        out_of_date_repo, in_tmpdir, mock_out_store_directory,
+):
+    # Write out the config
+    config = make_config_from_repo(
+        out_of_date_repo.path, sha=out_of_date_repo.original_sha, check=False,
+    )
+    write_config('.', config)
+
+    runner = Runner('.', C.CONFIG_FILE)
+    before = open(C.CONFIG_FILE).read()
+    # It will not update it, because the name doesn't match
+    ret = autoupdate(runner, tags_only=False, repo='wrong_repo_name')
+    after = open(C.CONFIG_FILE).read()
+    assert ret == 0
+    assert before == after
+
+
 def test_does_not_reformat(
         out_of_date_repo, mock_out_store_directory, in_tmpdir,
 ):