Add nocommit hook

pre_commit_hooks/no_commit_keywords.py

@@ -0,0 +1,47 @@
+import argparse
+import os
+from typing import Optional
+from typing import Sequence
+import re
+
+
+def check_for_no_commit_tokens(
+        filename: str,
+        tokens: Optional[Sequence[str]],
+) -> str:
+    with open(filename, mode='r', encoding='utf-8') as file_processed:
+        lines = file_processed.read()
+        for token in tokens:
+            match = re.search(token, lines)
+            if match:
+                # no-commit token is present
+                return match.string
+    return None
+
+
+def main(argv: Optional[Sequence[str]] = None) -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        '--tokens',
+        help=(
+            'The set of tokens, separated by space, used to block commits  '
+            'if present. For example, "nocommit NOCOMMIT"'
+        ),
+    )
+    parser.add_argument('filenames', nargs='*', help='Filenames to fix')
+    args = parser.parse_args(argv)
+
+    return_code = 0
+    tokens = args.tokens or ["nocommit"]
+
+    for filename in args.filenames:
+        _, extension = os.path.splitext(filename.lower())
+        match_string = check_for_no_commit_tokens(filename, tokens)
+        if match_string:
+            print(f'Found no-commit token in {filename}: {match_string}')
+            return_code = 1
+    return return_code
+
+
+if __name__ == '__main__':
+    exit(main())