Implement check-files-matches-any meta hook

pre_commit/meta_hooks/check_files_matches_any.py

@@ -0,0 +1,36 @@
+import re
+import sys
+
+import pre_commit.constants as C
+from pre_commit.clientlib import load_config
+from pre_commit.git import get_all_files
+
+
+def files_matches_any(filenames, include):
+    include_re = re.compile(include)
+    for filename in filenames:
+        if include_re.search(filename):
+            return True
+    return False
+
+
+def check_files_matches_any(config_file=None):
+    config = load_config(config_file or C.CONFIG_FILE)
+    files = get_all_files()
+    files_not_matched = False
+
+    for repo in config['repos']:
+        for hook in repo['hooks']:
+            include = hook.get('files', '')
+            if include and not files_matches_any(files, include):
+                print(
+                    'The files pattern for {} does not match any files'
+                    .format(hook['id'])
+                )
+                files_not_matched = True
+
+    return files_not_matched
+
+
+if __name__ == '__main__':
+    sys.exit(check_files_matches_any())