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#!/usr/bin/env python3

"""

scripts/update_python_version.py

Sync this repo's .po files against a target CPython release tag.

Usage:

python scripts/update_python_version.py v3.14.6

python scripts/update_python_version.py v3.15.0 --keep-src

Run this from anywhere inside the repo (it locates the repo root from

this file's location, assuming it lives in <repo>/scripts/).

"""

import argparse

import shutil

import subprocess

import sys

from pathlib import Path

REPO_ROOT = Path(__file__).resolve().parent.parent

WORKDIR = REPO_ROOT / ".cpython-src" # scratch clone, deleted by default when done

def run(cmd, cwd=None):

print(f"$ {' '.join(str(c) for c in cmd)}")

subprocess.run(cmd, cwd=cwd, check=True)

def fetch_cpython(tag: str) -> None:

if WORKDIR.exists():

shutil.rmtree(WORKDIR)

run([

"git", "clone", "--depth", "1", "--branch", tag,

"https://github.com/python/cpython.git", str(WORKDIR),

])

def build_gettext(tag: str) -> Path:

"""Build .pot templates from the CPython docs at `tag`, return their root dir."""

doc_dir = WORKDIR / "Doc"

venv_dir = doc_dir / "venv"

run([sys.executable, "-m", "venv", str(venv_dir)])

pip = venv_dir / "bin" / "pip"

sphinx_build = venv_dir / "bin" / "sphinx-build"

run([str(pip), "install", "-r", "requirements.txt"], cwd=doc_dir)

run([str(sphinx_build), "-b", "gettext", ".", "build/gettext"], cwd=doc_dir)

return doc_dir / "build" / "gettext"

def merge_all(pot_root: Path) -> None:

updated = new_po = missing_pot = 0

# existing .po files -> merge against matching .pot by relative path

for po_path in sorted(REPO_ROOT.rglob("*.po")):

if ".cpython-src" in po_path.parts or ".git" in po_path.parts:

continue

rel = po_path.relative_to(REPO_ROOT)

pot_path = pot_root / rel.with_suffix(".pot")

if not pot_path.exists():

print(f" ! no matching .pot for {rel} "

f"(page may have been removed/renamed upstream — review manually)")

missing_pot += 1

continue

run(["msgmerge", "--update", "--backup=off", str(po_path), str(pot_path)])

updated += 1

# brand-new .pot files with no .po counterpart yet -> create empty .po via msginit

for pot_path in sorted(pot_root.rglob("*.pot")):

rel = pot_path.relative_to(pot_root)

po_path = REPO_ROOT / rel.with_suffix(".po")

if not po_path.exists():

po_path.parent.mkdir(parents=True, exist_ok=True)

run(["msginit", "--no-translator", "-l", "fa", "-i", str(pot_path), "-o", str(po_path)])

new_po += 1

print(f"\nSummary: {updated} .po files merged, {new_po} new .po files created, "

f"{missing_pot} .po files with no matching upstream source.")

def check_po_files() -> None:

bad = []

for po_path in sorted(REPO_ROOT.rglob("*.po")):

if ".cpython-src" in po_path.parts or ".git" in po_path.parts:

continue

result = subprocess.run(

["msgfmt", "--check", "-o", "/dev/null", str(po_path)],

capture_output=True, text=True,

)

if result.returncode != 0:

bad.append((po_path, result.stderr.strip()))

if bad:

print("\nBroken .po files (fix before committing):")

for path, err in bad:

print(f" {path}:\n {err}")

sys.exit(1)

print("\nAll .po files pass `msgfmt --check`.")

def main() -> None:

parser = argparse.ArgumentParser(description=__doc__)

parser.add_argument("tag", help="CPython git tag to sync against, e.g. v3.14.6")

parser.add_argument("--keep-src", action="store_true",

help="keep the scratch CPython checkout instead of deleting it")

args = parser.parse_args()

print(f"== Fetching CPython {args.tag} ==")

fetch_cpython(args.tag)

print("\n== Building gettext templates ==")

pot_root = build_gettext(args.tag)

print("\n== Merging into this repo's .po files ==")

merge_all(pot_root)

print("\n== Validating .po files ==")

check_po_files()

if not args.keep_src:

shutil.rmtree(WORKDIR, ignore_errors=True)

print(f"\nDone. Review the diff, then commit as something like:\n"

f' git commit -am "Sync translations with CPython {args.tag}"')

if __name__ == "__main__":

main()

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