Add 'types' to the schema

pre_commit/clientlib.py

@@ -5,6 +5,7 @@ import argparse
 import functools
 
 from aspy.yaml import ordered_load
+from identify.identify import ALL_TAGS
 
 import pre_commit.constants as C
 from pre_commit import schema
@@ -19,6 +20,14 @@ def check_language(v):
         )
 
 
+def check_type_tag(tag):
+    if tag not in ALL_TAGS:
+        raise schema.ValidationError(
+            'Type tag {!r} is not recognized.  '
+            'Try upgrading identify and pre-commit?'.format(tag),
+        )
+
+
 def _make_argparser(filenames_help):
     parser = argparse.ArgumentParser()
     parser.add_argument('filenames', nargs='*', help=filenames_help)
@@ -36,10 +45,11 @@ MANIFEST_HOOK_DICT = schema.Map(
         'language', schema.check_and(schema.check_string, check_language),
     ),
 
-    schema.Conditional(
+    schema.Optional(
         'files', schema.check_and(schema.check_string, schema.check_regex),
-        condition_key='always_run', condition_value=False,
+        '',
     ),
+    schema.Optional('types', schema.check_array(check_type_tag), ['file']),
 
     schema.Optional(
         'additional_dependencies', schema.check_array(schema.check_string), [],

pre_commit/commands/run.py

@@ -58,7 +58,7 @@ NO_FILES = '(no files to check)'
 
 
 def _run_single_hook(hook, repo, args, skips, cols):
-    filenames = get_filenames(args, hook.get('files', '^$'), hook['exclude'])
+    filenames = get_filenames(args, hook['files'], hook['exclude'])
     if hook['id'] in skips:
         output.write(get_hook_message(
             _hook_msg_start(hook, args.verbose),