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':