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#!/usr/bin/venv python3

"""Script for handling translations with Babel"""

from __future__ import annotations

import argparse

import ast

import subprocess

import tomllib

from pathlib import Path

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

PYPROJECT_TOML = PROJECT_DIR / "pyproject.toml"

INIT_PY = PROJECT_DIR / "python_docs_theme" / "__init__.py"

# Global variables used by pybabel below (paths relative to PROJECT_DIR)

DOMAIN = "messages"

COPYRIGHT_HOLDER = "Python Software Foundation"

LOCALES_DIR = "locales"

POT_FILE = Path(LOCALES_DIR, f"{DOMAIN}.pot")

SOURCE_DIR = "python_docs_theme"

MAPPING_FILE = ".babel.cfg"

def get_project_info() -> dict:

"""Retrieve project's info to populate the message catalog template"""

pyproject_text = PYPROJECT_TOML.read_text(encoding="utf-8")

project_data = tomllib.loads(pyproject_text)["project"]

# read __version__ from __init__.py

for child in ast.parse(INIT_PY.read_bytes()).body:

if not isinstance(child, ast.Assign):

continue

target = child.targets[0]

if not isinstance(target, ast.Name) or target.id != "__version__":

continue

version_node = child.value

if not isinstance(version_node, ast.Constant):

continue

project_data["version"] = version_node.value

break

return project_data

def extract_messages() -> None:

"""Extract messages from all source files into message catalog template"""

Path(PROJECT_DIR, LOCALES_DIR).mkdir(parents=True, exist_ok=True)

project_data = get_project_info()

subprocess.run(

[

"pybabel",

"extract",

"-F",

MAPPING_FILE,

"--copyright-holder",

COPYRIGHT_HOLDER,

"--project",

project_data["name"],

"--version",

project_data["version"],

"--msgid-bugs-address",

project_data["urls"]["Issue tracker"],

"-o",

POT_FILE,

SOURCE_DIR,

cwd=PROJECT_DIR,

check=True,

)

def init_locale(locale: str) -> None:

"""Initialize a new locale based on existing message catalog template"""

pofile = PROJECT_DIR / LOCALES_DIR / locale / "LC_MESSAGES" / f"{DOMAIN}.po"

if pofile.exists():

print(f"There is already a message catalog for locale {locale}, skipping.")

return

cmd = ["pybabel", "init", "-i", POT_FILE, "-d", LOCALES_DIR, "-l", locale]

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

def update_catalogs(locale: str) -> None:

"""Update translations from existing message catalogs"""

cmd = ["pybabel", "update", "-i", POT_FILE, "-d", LOCALES_DIR]

if locale:

cmd.extend(["-l", locale])

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

def compile_catalogs(locale: str) -> None:

"""Compile existing message catalogs"""

cmd = ["pybabel", "compile", "-d", LOCALES_DIR]

if locale:

cmd.extend(["-l", locale])

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

def main() -> None:

parser = argparse.ArgumentParser(description=__doc__)

parser.add_argument(

"command",

choices=["extract", "init", "update", "compile"],

help="command to be executed",

)

parser.add_argument(

"-l",

"--locale",

default="",

help="language code (needed for init, optional for update and compile)",

)

args = parser.parse_args()

locale = args.locale

if args.command == "extract":

extract_messages()

elif args.command == "init":

if not locale:

parser.error("init requires passing the --locale option")

init_locale(locale)

elif args.command == "update":

update_catalogs(locale)

elif args.command == "compile":

compile_catalogs(locale)

if __name__ == "__main__":

main()

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