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#!/usr/bin/env python

"""

Generate a commit message

Parses staged files and generates a commit message with Last-Translator's as

co-authors.

Based on Stan Ulbrych's implementation for Python Doc' Polish team

"""

import argparse

import contextlib

import os

from subprocess import run, CalledProcessError

from pathlib import Path

from polib import pofile, POFile

def generate_commit_msg():

translators: set[str] = set()

result = run(

["git", "diff", "--cached", "--name-only", "--diff-filter=ACM"],

capture_output=True,

text=True,

check=True,

)

staged = [

filename for filename in result.stdout.splitlines() if filename.endswith(".po")

]

for file in staged:

staged_file = run(

["git", "show", f":{file}"], capture_output=True, text=True, check=True

).stdout

try:

old_file = run(

["git", "show", f"HEAD:{file}"],

capture_output=True,

text=True,

check=True,

).stdout

except CalledProcessError:

old_file = ""

new_po = pofile(staged_file)

old_po = pofile(old_file) if old_file else POFile()

old_entries = {entry.msgid: entry.msgstr for entry in old_po}

for entry in new_po:

if entry.msgstr and (

entry.msgid not in old_entries

or old_entries[entry.msgid] != entry.msgstr

# Prevent failure on missing Last-Translator field.

# Transifex only adds Last-Translator if someone from

# the team translated. If it was uploaded by an account

# that is not in the team, this field will be missing.

translator = (

(new_po.metadata.get("Last-Translator") or "").split(",")[0].strip()

)

if translator:

translators.add(f"Co-Authored-By: {translator}")

break

print("Update translation\n\n" + "\n".join(translators))

# contextlib implemented chdir since Python 3.11

@contextlib.contextmanager

def chdir(path: Path):

"""Temporarily change the working directory."""

original_dir = Path.cwd()

os.chdir(path)

try:

yield

finally:

os.chdir(original_dir)

if __name__ == "__main__":

parser = argparse.ArgumentParser(

description="Generate commit message with translators as co-authors."

)

parser.add_argument(

"path",

type=Path,

nargs="?",

default=".",

help="Path to the Git repository (default: current directory)",

)

args = parser.parse_args()

with chdir(args.path):

generate_commit_msg()