Add hook to check the number of allowed lines

pre_commit_hooks/check_number_of_lines_count.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+import argparse
+from typing import Optional
+from typing import Sequence
+
+
+def main(argv: Optional[Sequence[str]] = None) -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument('filenames', nargs='*')
+    parser.add_argument(
+        '--max-lines',
+        default=30,
+        type=int,
+        action='store',
+        help='Maximum allowable number of lines (default: 30)',
+    )
+    args = parser.parse_args(argv)
+
+    retcode = 0
+    for filename in args.filenames:
+        with open(filename) as file:
+            file_content = file.readlines()
+            number_of_lines = len(file_content)
+            if number_of_lines > args.max_lines:
+                print(
+                    f'{filename} ({number_of_lines} lines) exceeds '
+                    f'{args.max_lines} lines.',
+                )
+                retcode = 1
+
+    return retcode
+
+
+if __name__ == '__main__':
+    exit(main())