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# SPDX-License-Identifier: GPL-3.0-or-later
# Handling of gettext for Hydrilla.
#
# This file is part of Hydrilla
#
# Copyright (C) 2021, 2022 Wojtek Kosior
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
#
# I, Wojtek Kosior, thereby promise not to sue for violation of this
# file's license. Although I request that you do not make use this code
# in a proprietary program, I am not going to enforce this in court.
# Enable using with Python 3.7.
from __future__ import annotations
import locale as lcl
import gettext
from pathlib import Path
from typing import Optional
here = Path(__file__).resolve().parent
localedir = here / 'locales'
supported_locales = [f.name for f in localedir.iterdir() if f.is_dir()]
default_locale = 'en_US'
def select_best_locale() -> str:
"""
....
Otherwise, try to determine system's default language and use that.
"""
# TODO: Stop referenceing flask here. Instead, allow other code to register
# custom locale resolvers and register flask-aware resolver during
# runtime from within the flask-related part(s) of the application.
try:
import flask
use_flask = flask.has_request_context()
except ModuleNotFoundError:
use_flask = False
if use_flask:
best = flask.request.accept_languages.best_match(
supported_locales,
default=default_locale
)
assert best is not None
return best
# https://stackoverflow.com/questions/3425294/how-to-detect-the-os-default-language-in-python
# I am not going to surrender to Microbugs' nonfree, crappy OS to test it,
# so the lines inside try: block may actually fail.
locale: Optional[str] = lcl.getdefaultlocale()[0]
try:
from ctypes.windll import kernel32 as windll # type: ignore
locale = lcl.windows_locale[windll.GetUserDefaultUILanguage()]
except:
pass
return locale if locale in supported_locales else default_locale
translations: dict[str, gettext.NullTranslations] = {}
def translation(locale: Optional[str] = None) -> gettext.NullTranslations:
"""
Configure translations for domain 'messages' and return the object that
represents them. If the requested locale is not available, fall back to
'en_US'.
"""
if locale is None:
locale = select_best_locale()
if not (localedir / locale).is_dir():
locale = 'en_US'
if locale not in translations:
translations[locale] = gettext.translation(
'messages',
localedir=localedir,
languages=[locale]
)
return translations[locale]
def smart_gettext(msg: str, locale: Optional[str] = None) -> str:
"""...."""
return translation(locale).gettext(msg)
_ = smart_gettext
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