Implement types filtering

pre_commit/commands/run.py

@@ -6,18 +6,24 @@ import os
 import subprocess
 import sys
 
+from identify.identify import tags_from_path
+
 from pre_commit import color
 from pre_commit import git
 from pre_commit import output
 from pre_commit.output import get_hook_message
 from pre_commit.staged_files_only import staged_files_only
 from pre_commit.util import cmd_output
+from pre_commit.util import memoize_by_cwd
 from pre_commit.util import noop_context
 
 
 logger = logging.getLogger('pre_commit')
 
 
+tags_from_path = memoize_by_cwd(tags_from_path)
+
+
 def _get_skips(environ):
     skips = environ.get('SKIP', '')
     return {skip.strip() for skip in skips.split(',') if skip.strip()}
@@ -37,6 +43,14 @@ def get_changed_files(new, old):
     )[1].splitlines()
 
 
+def filter_filenames_by_types(filenames, types):
+    types = frozenset(types)
+    return tuple(
+        filename for filename in filenames
+        if tags_from_path(filename) >= types
+    )
+
+
 def get_filenames(args, include_expr, exclude_expr):
     if args.origin and args.source:
         getter = git.get_files_matching(
@@ -59,6 +73,7 @@ NO_FILES = '(no files to check)'
 
 def _run_single_hook(hook, repo, args, skips, cols):
     filenames = get_filenames(args, hook['files'], hook['exclude'])
+    filenames = filter_filenames_by_types(filenames, hook['types'])
     if hook['id'] in skips:
         output.write(get_hook_message(
             _hook_msg_start(hook, args.verbose),