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82 lines
2.6 KiB
Python
82 lines
2.6 KiB
Python
"""
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Original docs link: https://docs.aiogram.dev/en/dev-3.x/utils/i18n.html
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PROBLEM SOLUTION PROVIDED:
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Aiogram handlers remember language on the start and there's no chance of changing it in handler's runtime.
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So, here's a little hack in `change_language handler`
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# Cheatsheet to create/update locales:
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## Generating new:
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1. `pybabel extract -k __ --input-dirs=. -o locales/messages.pot`
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2. `pybabel init -i locales/messages.pot -d locales -D messages -l <en ru uk>`
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3. Open `locales/{language}/LC_MESSAGES/messages.po` and Translate msgs
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4. `pybabel compile -d locales -D messages`
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## Updating:
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1. `pybabel extract -k __ --input-dirs=. -o locales/messages.pot`
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2. `pybabel update -d locales -D messages -i locales/messages.pot`
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3. Open `locales/{language}/LC_MESSAGES/messages.po` and Translate msgs
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4. `pybabel compile -d locales -D messages`
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"""
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import asyncio
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from typing import Any
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from aiogram import Bot, Dispatcher, Router
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from aiogram import types
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from aiogram.filters.command import Command, CommandStart
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from aiogram.utils.i18n import gettext as _, I18n
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from aiogram.utils.i18n.middleware import I18nMiddleware
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class BotI18nMiddleware(I18nMiddleware):
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async def get_locale(self, event: types.Update | Any, data: dict[str, Any]) -> str:
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# here is your logic, ex. get language from redis DB
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return 'en'
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bot = Bot(token="<Your token>")
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router = Router()
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dp = Dispatcher()
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# NOTE: custom middleware is provided. You can use any middleware you want, ex: SimpleI18nMiddleware
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i18n_middleware = BotI18nMiddleware(
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I18n(
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path="locales",
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default_locale="en",
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domain="messages"
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)
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)
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dp.update.outer_middleware(i18n_middleware)
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@router.message(CommandStart())
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async def start_handler(message: types.Message):
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await message.answer(
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_("Hello!. Write /language <new_lang>. Ex: /language ru")
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)
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@router.message(Command("language"))
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async def change_language(message: types.Message):
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"""
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This function dynamically changes language inside of handler
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Handler input: /language <new_lang>. Ex: /language ru
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Aiogram saves language context on start, so we should change language in runtime
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"""
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new_lang = message.text.split(maxsplit=1)[1]
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# change in runtime
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with i18n_middleware.i18n.context(), i18n_middleware.i18n.use_locale(new_lang):
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# all messages in this context will be translated to new_lang
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await message.answer(_('Language was changed to {lang}').format(lang=new_lang))
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dp.include_router(router)
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async def main():
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print("Bot started")
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await dp.start_polling(bot)
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if __name__ == "__main__":
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asyncio.run(main())
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