STYLE,BUG: autotyping hook fails if run on no files (pandas-dev#48814)

* add run_autotyping script

* simplify

* exit 0 if no paths

Co-authored-by: MarcoGorelli <>

Author: MarcoGorelli

.pre-commit-config.yaml

@@ -268,7 +268,7 @@ repos:
             |/_testing/
     -   id: autotyping
         name: autotyping
-        entry: python -m libcst.tool codemod autotyping.AutotypeCommand --aggressive
+        entry: python -m scripts.run_autotyping
         types_or: [python, pyi]
         files: ^pandas
         exclude: ^(pandas/tests|pandas/_version.py|pandas/io/clipboard)

scripts/run_autotyping.py

@@ -0,0 +1,36 @@
+"""
+Script to run ``autotyping``, to get around the fact that
+pre-commit puts ``args`` before the list of files, whereas
+``autotyping`` wants the files to come after, see
+https://github.com/pandas-dev/pandas/issues/48808#issuecomment-1259711679.
+"""
+from __future__ import annotations
+
+import argparse
+import subprocess
+import sys
+from typing import Sequence
+
+
+def main(argv: Sequence[str] | None = None) -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("paths", nargs="*")
+    args = parser.parse_args(argv)
+    if not args.paths:
+        sys.exit(0)
+    output = subprocess.run(
+        [
+            "python",
+            "-m",
+            "libcst.tool",
+            "codemod",
+            "autotyping.AutotypeCommand",
+            *args.paths,
+            "--aggressive",
+        ],
+    )
+    sys.exit(output.returncode)
+
+
+if __name__ == "__main__":
+    main()