Merge pull request #1511 from abdullaev388/master

Added sync i18n class based middleware

examples/middleware/class_based/i18n_middleware/i18n_base_midddleware.py

@@ -0,0 +1,121 @@
+import gettext
+import os
+import threading
+
+from telebot.handler_backends import BaseMiddleware
+
+try:
+    from babel.support import LazyProxy
+
+    babel_imported = True
+except ImportError:
+    babel_imported = False
+
+
+class I18N(BaseMiddleware):
+    """
+    This middleware provides high-level tool for internationalization
+    It is based on gettext util.
+    """
+
+    context_lang = threading.local()
+
+    def __init__(self, translations_path, domain_name: str):
+        super().__init__()
+        self.update_types = self.process_update_types()
+
+        self.path = translations_path
+        self.domain = domain_name
+        self.translations = self.find_translations()
+
+    @property
+    def available_translations(self):
+        return list(self.translations)
+
+    def gettext(self, text: str, lang: str = None):
+        """
+        Singular translations
+        """
+
+        if lang is None:
+            lang = self.context_lang.language
+
+        if lang not in self.translations:
+            return text
+
+        translator = self.translations[lang]
+        return translator.gettext(text)
+
+    def ngettext(self, singular: str, plural: str, lang: str = None, n=1):
+        """
+        Plural translations
+        """
+        if lang is None:
+            lang = self.context_lang.language
+
+        if lang not in self.translations:
+            if n == 1:
+                return singular
+            return plural
+
+        translator = self.translations[lang]
+        return translator.ngettext(singular, plural, n)
+
+    def lazy_gettext(self, text: str, lang: str = None):
+        if not babel_imported:
+            raise RuntimeError('babel module is not imported. Check that you installed it.')
+        return LazyProxy(self.gettext, text, lang, enable_cache=False)
+
+    def lazy_ngettext(self, singular: str, plural: str, lang: str = None, n=1):
+        if not babel_imported:
+            raise RuntimeError('babel module is not imported. Check that you installed it.')
+        return LazyProxy(self.ngettext, singular, plural, lang, n, enable_cache=False)
+
+    def get_user_language(self, obj):
+        """
+        You need to override this method and return user language
+        """
+        raise NotImplementedError
+
+    def process_update_types(self) -> list:
+        """
+        You need to override this method and return any update types which you want to be processed
+        """
+        raise NotImplementedError
+
+    def pre_process(self, message, data):
+        """
+        context language variable will be set each time when update from 'process_update_types' comes
+        value is the result of 'get_user_language' method
+        """
+
+        self.context_lang.language = self.get_user_language(obj=message)
+
+    def post_process(self, message, data, exception):
+        pass
+
+    def find_translations(self):
+        """
+        Looks for translations with passed 'domain' in passed 'path'
+        """
+        if not os.path.exists(self.path):
+            raise RuntimeError(f"Translations directory by path: {self.path!r} was not found")
+
+        result = {}
+
+        for name in os.listdir(self.path):
+            translations_path = os.path.join(self.path, name, 'LC_MESSAGES')
+
+            if not os.path.isdir(translations_path):
+                continue
+
+            po_file = os.path.join(translations_path, self.domain + '.po')
+            mo_file = po_file[:-2] + 'mo'
+
+            if os.path.isfile(po_file) and not os.path.isfile(mo_file):
+                raise FileNotFoundError(f"Translations for: {name!r} were not compiled!")
+
+            with open(mo_file, 'rb') as file:
+                result[name] = gettext.GNUTranslations(file)
+
+        return result

examples/middleware/class_based/i18n_middleware/keyboards.py

@@ -0,0 +1,34 @@
+from telebot.types import InlineKeyboardMarkup, InlineKeyboardButton, ReplyKeyboardMarkup, KeyboardButton
+
+
+def languages_keyboard():
+    return InlineKeyboardMarkup(
+        keyboard=[
+            [
+                InlineKeyboardButton(text="English", callback_data='en'),
+                InlineKeyboardButton(text="Русский", callback_data='ru'),
+                InlineKeyboardButton(text="O'zbekcha", callback_data='uz_Latn')
+            ]
+        ]
+    )
+
+
+def clicker_keyboard(_):
+    return InlineKeyboardMarkup(
+        keyboard=[
+            [
+                InlineKeyboardButton(text=_("click"), callback_data='click'),
+            ]
+        ]
+    )
+
+
+def menu_keyboard(_):
+    keyboard = ReplyKeyboardMarkup(resize_keyboard=True)
+    keyboard.add(
+        KeyboardButton(text=_("My user id")),
+        KeyboardButton(text=_("My user name")),
+        KeyboardButton(text=_("My first name"))
+    )
+
+    return keyboard

examples/middleware/class_based/i18n_middleware/locales/en/LC_MESSAGES/messages.po

@@ -0,0 +1,81 @@
+# English translations for PROJECT.
+# Copyright (C) 2022 ORGANIZATION
+# This file is distributed under the same license as the PROJECT project.
+# FIRST AUTHOR <EMAIL@ADDRESS>, 2022.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: PROJECT VERSION\n"
+"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
+"POT-Creation-Date: 2022-02-19 18:37+0500\n"
+"PO-Revision-Date: 2022-02-18 16:22+0500\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: en\n"
+"Language-Team: en <LL@li.org>\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Babel 2.9.1\n"
+
+#: keyboards.py:20
+msgid "click"
+msgstr ""
+
+#: keyboards.py:29
+msgid "My user id"
+msgstr ""
+
+#: keyboards.py:30
+msgid "My user name"
+msgstr ""
+
+#: keyboards.py:31
+msgid "My first name"
+msgstr ""
+
+#: main.py:97
+msgid ""
+"Hello, {user_fist_name}!\n"
+"This is the example of multilanguage bot.\n"
+"Available commands:\n"
+"\n"
+"/lang - change your language\n"
+"/plural - pluralization example\n"
+"/menu - text menu example"
+msgstr ""
+
+#: main.py:121
+msgid "Language has been changed"
+msgstr ""
+
+#: main.py:130 main.py:150
+#, fuzzy
+msgid "You have {number} click"
+msgid_plural "You have {number} clicks"
+msgstr[0] ""
+msgstr[1] ""
+
+#: main.py:135 main.py:155
+msgid ""
+"This is clicker.\n"
+"\n"
+msgstr ""
+
+#: main.py:163
+msgid "This is ReplyKeyboardMarkup menu example in multilanguage bot."
+msgstr ""
+
+#: main.py:203
+msgid "Seems you confused language"
+msgstr ""
+
+#~ msgid ""
+#~ "Hello, {user_fist_name}!\n"
+#~ "This is the example of multilanguage bot.\n"
+#~ "Available commands:\n"
+#~ "\n"
+#~ "/lang - change your language\n"
+#~ "/plural - pluralization example"
+#~ msgstr ""
+

examples/middleware/class_based/i18n_middleware/locales/ru/LC_MESSAGES/messages.po

@@ -0,0 +1,82 @@
+# Russian translations for PROJECT.
+# Copyright (C) 2022 ORGANIZATION
+# This file is distributed under the same license as the PROJECT project.
+# FIRST AUTHOR <EMAIL@ADDRESS>, 2022.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: PROJECT VERSION\n"
+"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
+"POT-Creation-Date: 2022-02-19 18:37+0500\n"
+"PO-Revision-Date: 2022-02-18 16:22+0500\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: ru\n"
+"Language-Team: ru <LL@li.org>\n"
+"Plural-Forms: nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && "
+"n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2)\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Babel 2.9.1\n"
+
+#: keyboards.py:20
+msgid "click"
+msgstr "Клик"
+
+#: keyboards.py:29
+msgid "My user id"
+msgstr "Мой user id"
+
+#: keyboards.py:30
+msgid "My user name"
+msgstr "Мой user name"
+
+#: keyboards.py:31
+msgid "My first name"
+msgstr "Мой first name"
+
+#: main.py:97
+msgid ""
+"Hello, {user_fist_name}!\n"
+"This is the example of multilanguage bot.\n"
+"Available commands:\n"
+"\n"
+"/lang - change your language\n"
+"/plural - pluralization example\n"
+"/menu - text menu example"
+msgstr ""
+"Привет, {user_fist_name}!\n"
+"Это пример мультиязычного бота.\n"
+"Доступные команды:\n"
+"\n"
+"/lang - изменить язык\n"
+"/plural - пример плюрализации\n"
+"/menu - Пример текстового меню"
+
+#: main.py:121
+msgid "Language has been changed"
+msgstr "Язык был сменён"
+
+#: main.py:130 main.py:150
+msgid "You have {number} click"
+msgid_plural "You have {number} clicks"
+msgstr[0] "У вас {number} клик"
+msgstr[1] "У вас {number} клика"
+msgstr[2] "У вас {number} кликов"
+
+#: main.py:135 main.py:155
+msgid ""
+"This is clicker.\n"
+"\n"
+msgstr ""
+"Это кликер.\n"
+"\n"
+
+#: main.py:163
+msgid "This is ReplyKeyboardMarkup menu example in multilanguage bot."
+msgstr "Это пример ReplyKeyboardMarkup меню в мультиязычном боте."
+
+#: main.py:203
+msgid "Seems you confused language"
+msgstr "Кажется, вы перепутали язык"
+

examples/middleware/class_based/i18n_middleware/locales/uz_Latn/LC_MESSAGES/messages.po

@@ -0,0 +1,80 @@
+# Uzbek (Latin) translations for PROJECT.
+# Copyright (C) 2022 ORGANIZATION
+# This file is distributed under the same license as the PROJECT project.
+# FIRST AUTHOR <EMAIL@ADDRESS>, 2022.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: PROJECT VERSION\n"
+"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
+"POT-Creation-Date: 2022-02-19 18:37+0500\n"
+"PO-Revision-Date: 2022-02-18 16:22+0500\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language: uz_Latn\n"
+"Language-Team: uz_Latn <LL@li.org>\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Babel 2.9.1\n"
+
+#: keyboards.py:20
+msgid "click"
+msgstr "clik"
+
+#: keyboards.py:29
+msgid "My user id"
+msgstr "Mani user id"
+
+#: keyboards.py:30
+msgid "My user name"
+msgstr "Mani user name"
+
+#: keyboards.py:31
+msgid "My first name"
+msgstr "Mani first name"
+
+#: main.py:97
+msgid ""
+"Hello, {user_fist_name}!\n"
+"This is the example of multilanguage bot.\n"
+"Available commands:\n"
+"\n"
+"/lang - change your language\n"
+"/plural - pluralization example\n"
+"/menu - text menu example"
+msgstr ""
+"Salom, {user_fist_name}!\n"
+"Bu multilanguage bot misoli.\n"
+"Mavjud buyruqlar:\n"
+"\n"
+"/lang - tilni ozgartirish\n"
+"/plural - pluralizatsiya misoli\n"
+"/menu - text menu misoli"
+
+#: main.py:121
+msgid "Language has been changed"
+msgstr "Til ozgartirildi"
+
+#: main.py:130 main.py:150
+msgid "You have {number} click"
+msgid_plural "You have {number} clicks"
+msgstr[0] "Sizda {number}ta clik"
+msgstr[1] "Sizda {number}ta clik"
+
+#: main.py:135 main.py:155
+msgid ""
+"This is clicker.\n"
+"\n"
+msgstr ""
+"Bu clicker.\n"
+"\n"
+
+#: main.py:163
+msgid "This is ReplyKeyboardMarkup menu example in multilanguage bot."
+msgstr "Bu multilanguage bot da replykeyboardmarkup menyu misoli."
+
+#: main.py:203
+msgid "Seems you confused language"
+msgstr "Tilni adashtirdiz"
+

examples/middleware/class_based/i18n_middleware/main.py

@@ -0,0 +1,211 @@
+"""
+In this example you will learn how to adapt your bot to different languages
+Using built-in middleware I18N.
+
+You need to install babel package 'https://pypi.org/project/Babel/'
+Babel provides a command-line interface for working with message catalogs
+After installing babel package you have a script called 'pybabel'
+Too see all the commands open terminal and type 'pybabel --help'
+Full description for pybabel commands can be found here: 'https://babel.pocoo.org/en/latest/cmdline.html'
+
+Create a directory 'locales' where our translations will be stored
+
+First we need to extract texts:
+    pybabel extract -o locales/{domain_name}.pot --input-dirs .
+{domain_name}.pot - is the file where all translations are saved
+The name of this file should be the same as domain which you pass to I18N class
+In this example domain_name will be 'messages'
+
+For gettext (singular texts) we use '_' alias and it works perfect
+You may also you some alias for ngettext (plural texts) but you can face with a problem that
+your plural texts are not being extracted
+That is because by default 'pybabel extract' recognizes the following keywords:
+ _, gettext, ngettext, ugettext, ungettext, dgettext, dngettext, N_
+To add your own keyword you can use '-k' flag
+In this example for 'ngettext' i will assign double underscore alias '__'
+
+Full command with pluralization support will look so:
+    pybabel extract -o locales/{domain_name}.pot -k __:1,2 --input-dirs .
+
+Then create directories with translations (get list of all locales: 'pybabel --list-locales'):
+    pybabel init -i locales/{domain_name}.pot -d locales -l en
+    pybabel init -i locales/{domain_name}.pot -d locales -l ru
+    pybabel init -i locales/{domain_name}.pot -d locales -l uz_Latn
+
+Now you can translate the texts located in locales/{language}/LC_MESSAGES/{domain_name}.po
+After you translated all the texts you need to compile .po files:
+    pybabel compile -d locales
+
+When you delete/update your texts you also need to update them in .po files:
+    pybabel extract -o locales/{domain_name}.pot -k __:1,2 --input-dirs .
+    pybabel update -i locales/{domain_name}.pot -d locales
+    - translate
+    pybabel compile -d locales
+
+If you have any exceptions check:
+    - you have installed babel
+    - translations are ready, so you just compiled it
+    - in the commands above you replaced {domain_name} to messages
+    - you are writing commands from correct path in terminal
+"""
+
+import asyncio
+from typing import Union
+
+import keyboards
+from i18n_base_midddleware import I18N
+from telebot import TeleBot
+from telebot import types, StateMemoryStorage
+from telebot.custom_filters import TextMatchFilter, TextFilter
+
+class I18NMiddleware(I18N):
+
+    def process_update_types(self) -> list:
+        """
+        Here you need to return a list of update types which you want to be processed
+        """
+        return ['message', 'callback_query']
+
+    def get_user_language(self, obj: Union[types.Message, types.CallbackQuery]):
+        """
+        This method is called when new update comes (only updates which you return in 'process_update_types' method)
+        Returned language will be used in 'pre_process' method of parent class
+        Returned language will be set to context language variable.
+        If you need to get translation with user's actual language you don't have to pass it manually
+        It will be automatically passed from context language value.
+        However if you need some other language you can always pass it.
+        """
+
+        user_id = obj.from_user.id
+
+        if user_id not in users_lang:
+            users_lang[user_id] = 'en'
+
+        return users_lang[user_id]
+
+
+storage = StateMemoryStorage()
+bot = TeleBot("", state_storage=storage, use_class_middlewares=True)
+
+i18n = I18NMiddleware(translations_path='locales', domain_name='messages')
+_ = i18n.gettext  # for singular translations
+__ = i18n.ngettext  # for plural translations
+
+# These are example storages, do not use it in a production development
+users_lang = {}
+users_clicks = {}
+
+@bot.message_handler(commands=['start'])
+def start_handler(message: types.Message):
+    text = _("Hello, {user_fist_name}!\n"
+             "This is the example of multilanguage bot.\n"
+             "Available commands:\n\n"
+             "/lang - change your language\n"
+             "/plural - pluralization example\n"
+             "/menu - text menu example")
+
+    # remember don't use f string for interpolation, use .format method instead
+    text = text.format(user_fist_name=message.from_user.first_name)
+    bot.send_message(message.from_user.id, text)
+
+
+@bot.message_handler(commands=['lang'])
+def change_language_handler(message: types.Message):
+    bot.send_message(message.chat.id, "Choose language\nВыберите язык\nTilni tanlang",
+                     reply_markup=keyboards.languages_keyboard())
+
+
+@bot.callback_query_handler(func=None, text=TextFilter(contains=['en', 'ru', 'uz_Latn']))
+def language_handler(call: types.CallbackQuery):
+    lang = call.data
+    users_lang[call.from_user.id] = lang
+
+    # When you changed user language, you have to pass it manually beacause it is not changed in context
+    bot.edit_message_text(_("Language has been changed", lang=lang), call.from_user.id, call.message.id)
+
+
+@bot.message_handler(commands=['plural'])
+def pluralization_handler(message: types.Message):
+    if not users_clicks.get(message.from_user.id):
+        users_clicks[message.from_user.id] = 0
+    clicks = users_clicks[message.from_user.id]
+
+    text = __(
+        singular="You have {number} click",
+        plural="You have {number} clicks",
+        n=clicks
+    )
+    text = _("This is clicker.\n\n") + text.format(number=clicks)
+
+    bot.send_message(message.chat.id, text, reply_markup=keyboards.clicker_keyboard(_))
+
+
+@bot.callback_query_handler(func=None, text=TextFilter(equals='click'))
+def click_handler(call: types.CallbackQuery):
+    if not users_clicks.get(call.from_user.id):
+        users_clicks[call.from_user.id] = 1
+    else:
+        users_clicks[call.from_user.id] += 1
+
+    clicks = users_clicks[call.from_user.id]
+
+    text = __(
+        singular="You have {number} click",
+        plural="You have {number} clicks",
+        n=clicks
+    )
+    text = _("This is clicker.\n\n") + text.format(number=clicks)
+
+    bot.edit_message_text(text, call.from_user.id, call.message.message_id,
+                          reply_markup=keyboards.clicker_keyboard(_))
+
+
+@bot.message_handler(commands=['menu'])
+def menu_handler(message: types.Message):
+    text = _("This is ReplyKeyboardMarkup menu example in multilanguage bot.")
+    bot.send_message(message.chat.id, text, reply_markup=keyboards.menu_keyboard(_))
+
+
+# For lazy tranlations
+# lazy gettext is used when you don't know user's locale
+# It can be used for example to handle text buttons in multilanguage bot
+# The actual translation will be delayed until update comes and context language is set
+l_ = i18n.lazy_gettext
+
+
+# Handlers below will handle text according to user's language
+@bot.message_handler(text=l_("My user id"))
+def return_user_id(message: types.Message):
+    bot.send_message(message.chat.id, str(message.from_user.id))
+
+
+@bot.message_handler(text=l_("My user name"))
+def return_user_id(message: types.Message):
+    username = message.from_user.username
+    if not username:
+        username = '-'
+    bot.send_message(message.chat.id, username)
+
+
+# You can make it case-insensitive
+@bot.message_handler(text=TextFilter(equals=l_("My first name"), ignore_case=True))
+def return_user_id(message: types.Message):
+    bot.send_message(message.chat.id, message.from_user.first_name)
+
+
+all_menu_texts = []
+for language in i18n.available_translations:
+    for menu_text in ("My user id", "My user name", "My first name"):
+        all_menu_texts.append(_(menu_text, language))
+
+
+# When user confused language. (handles all menu buttons texts)
+@bot.message_handler(text=TextFilter(contains=all_menu_texts, ignore_case=True))
+def missed_message(message: types.Message):
+    bot.send_message(message.chat.id, _("Seems you confused language"), reply_markup=keyboards.menu_keyboard(_))
+
+
+if __name__ == '__main__':
+    bot.setup_middleware(i18n)
+    bot.add_custom_filter(TextMatchFilter())
+    asyncio.run(bot.infinity_polling())

examples/middleware/function_based/i18n_gettext/i18n_class.py

@@ -1,5 +1,6 @@
 import gettext
 import os
+import threading
 
 
 class I18N:
@@ -8,6 +9,8 @@ class I18N:
     It is based on gettext util.
     """
 
+    context_lang = threading.local()
+
     def __init__(self, translations_path, domain_name: str):
         self.path = translations_path
         self.domain = domain_name
@@ -21,7 +24,11 @@ class I18N:
         """
         Singular translations
         """
-        if not lang or lang not in self.translations:
+
+        if lang is None:
+            lang = self.context_lang.language
+
+        if lang not in self.translations:
             return text
 
         translator = self.translations[lang]
@@ -31,7 +38,10 @@ class I18N:
         """
         Plural translations
         """
-        if not lang or lang not in self.translations:
+        if lang is None:
+            lang = self.context_lang.language
+
+        if lang not in self.translations:
             if n == 1:
                 return singular
             return plural
@@ -39,6 +49,7 @@ class I18N:
         translator = self.translations[lang]
         return translator.ngettext(singular, plural, n)
 
+
     def find_translations(self):
         """
         Looks for translations with passed 'domain' in passed 'path'

examples/middleware/function_based/i18n_gettext/keyboards.py

@@ -13,11 +13,11 @@ def languages_keyboard():
     )
 
 
-def clicker_keyboard(_, lang):
+def clicker_keyboard(_):
     return InlineKeyboardMarkup(
         keyboard=[
             [
-                InlineKeyboardButton(text=_("click", lang=lang), callback_data='click'),
+                InlineKeyboardButton(text=_("click"), callback_data='click'),
             ]
         ]
     )

examples/middleware/function_based/i18n_gettext/locales/en/LC_MESSAGES/messages.po

@@ -48,4 +48,3 @@ msgid ""
 "This is clicker.\n"
 "\n"
 msgstr ""
-

examples/middleware/function_based/i18n_gettext/locales/ru/LC_MESSAGES/messages.po

@@ -57,4 +57,3 @@ msgid ""
 msgstr ""
 "Это кликер.\n"
 "\n"
-

examples/middleware/function_based/i18n_gettext/locales/uz_Latn/LC_MESSAGES/messages.po

@@ -55,4 +55,3 @@ msgid ""
 msgstr ""
 "Bu clicker.\n"
 "\n"
-

examples/middleware/function_based/i18n_gettext/main.py

@@ -1,21 +1,17 @@
 """
 In this example you will learn how to adapt your bot to different languages
 Using built-in class I18N.
-
 You need to install babel package 'https://pypi.org/project/Babel/'
 Babel provides a command-line interface for working with message catalogs
 After installing babel package you have a script called 'pybabel'
 Too see all the commands open terminal and type 'pybabel --help'
 Full description for pybabel commands can be found here: 'https://babel.pocoo.org/en/latest/cmdline.html'
-
 Create a directory 'locales' where our translations will be stored
-
 First we need to extract texts:
     pybabel extract -o locales/{domain_name}.pot --input-dirs .
 {domain_name}.pot - is the file where all translations are saved
 The name of this file should be the same as domain which you pass to I18N class
 In this example domain_name will be 'messages'
-
 For gettext (singular texts) we use '_' alias and it works perfect
 You may also you some alias for ngettext (plural texts) but you can face with a problem that
 your plural texts are not being extracted
@@ -23,25 +19,20 @@ That is because by default 'pybabel extract' recognizes the following keywords:
  _, gettext, ngettext, ugettext, ungettext, dgettext, dngettext, N_
 To add your own keyword you can use '-k' flag
 In this example for 'ngettext' i will assign double underscore alias '__'
-
 Full command with pluralization support will look so:
     pybabel extract -o locales/{domain_name}.pot -k __:1,2 --input-dirs .
-
 Then create directories with translations (get list of all locales: 'pybabel --list-locales'):
     pybabel init -i locales/{domain_name}.pot -d locales -l en
     pybabel init -i locales/{domain_name}.pot -d locales -l ru
     pybabel init -i locales/{domain_name}.pot -d locales -l uz_Latn
-
 Now you can translate the texts located in locales/{language}/LC_MESSAGES/{domain_name}.po
 After you translated all the texts you need to compile .po files:
     pybabel compile -d locales
-
 When you delete/update your texts you also need to update them in .po files:
     pybabel extract -o locales/{domain_name}.pot -k __:1,2 --input-dirs .
     pybabel update -i locales/{domain_name}.pot -d locales
     - translate
     pybabel compile -d locales
-
 If you have any exceptions check:
     - you have installed babel
     - translations are ready, so you just compiled it
@@ -49,14 +40,17 @@ If you have any exceptions check:
     - you are writing commands from correct path in terminal
 """
 
-from functools import wraps
-import keyboards
 from telebot import TeleBot, types, custom_filters
+from telebot import apihelper
 from telebot.storage.memory_storage import StateMemoryStorage
+
+import keyboards
 from i18n_class import I18N
 
+apihelper.ENABLE_MIDDLEWARE = True
 storage = StateMemoryStorage()
-bot = TeleBot("", state_storage=storage)
+# IMPORTANT! This example works only if polling is non-threaded.
+bot = TeleBot("", state_storage=storage, threaded=False)
 
 i18n = I18N(translations_path='locales', domain_name='messages')
 _ = i18n.gettext  # for singular translations
@@ -67,35 +61,25 @@ users_lang = {}
 users_clicks = {}
 
 
-def get_user_language(func):
-    """
-    This decorator will pass to your handler current user's language
-    """
-
-    @wraps(func)
-    def inner(*args, **kwargs):
-        obj = args[0]
-        kwargs.update(lang=users_lang.get(obj.from_user.id, 'en'))
-        return func(*args, **kwargs)
-
-    return inner
+@bot.middleware_handler(update_types=['message', 'callback_query'])
+def set_contex_language(bot_instance, message):
+    i18n.context_lang.language = users_lang.get(message.from_user.id, 'en')
 
 
-@bot.message_handler(commands='start')
-@get_user_language
-def start_handler(message: types.Message, lang):
+@bot.message_handler(commands=['start'])
+def start_handler(message: types.Message):
     text = _("Hello, {user_fist_name}!\n"
              "This is the example of multilanguage bot.\n"
              "Available commands:\n\n"
              "/lang - change your language\n"
-             "/plural - pluralization example", lang=lang)
+             "/plural - pluralization example")
 
     # remember don't use f string for interpolation, use .format method instead
     text = text.format(user_fist_name=message.from_user.first_name)
     bot.send_message(message.from_user.id, text)
 
 
-@bot.message_handler(commands='lang')
+@bot.message_handler(commands=['lang'])
 def change_language_handler(message: types.Message):
     bot.send_message(message.chat.id, "Choose language\nВыберите язык\nTilni tanlang",
                      reply_markup=keyboards.languages_keyboard())
@@ -106,13 +90,13 @@ def language_handler(call: types.CallbackQuery):
     lang = call.data
     users_lang[call.from_user.id] = lang
 
+    # When you change user's language, pass language explicitly coz it's not changed in context
     bot.edit_message_text(_("Language has been changed", lang=lang), call.from_user.id, call.message.id)
     bot.delete_state(call.from_user.id)
 
 
-@bot.message_handler(commands='plural')
-@get_user_language
-def pluralization_handler(message: types.Message, lang):
+@bot.message_handler(commands=['plural'])
+def pluralization_handler(message: types.Message):
     if not users_clicks.get(message.from_user.id):
         users_clicks[message.from_user.id] = 0
     clicks = users_clicks[message.from_user.id]
@@ -121,15 +105,13 @@ def pluralization_handler(message: types.Message, lang):
         singular="You have {number} click",
         plural="You have {number} clicks",
         n=clicks,
-        lang=lang
     )
-    text = _("This is clicker.\n\n", lang=lang) + text.format(number=clicks)
-    bot.send_message(message.chat.id, text, reply_markup=keyboards.clicker_keyboard(_, lang))
+    text = _("This is clicker.\n\n") + text.format(number=clicks)
+    bot.send_message(message.chat.id, text, reply_markup=keyboards.clicker_keyboard(_))
 
 
 @bot.callback_query_handler(func=None, text=custom_filters.TextFilter(equals='click'))
-@get_user_language
-def click_handler(call: types.CallbackQuery, lang):
+def click_handler(call: types.CallbackQuery):
     if not users_clicks.get(call.from_user.id):
         users_clicks[call.from_user.id] = 1
     else:
@@ -140,12 +122,11 @@ def click_handler(call: types.CallbackQuery, lang):
     text = __(
         singular="You have {number} click",
         plural="You have {number} clicks",
-        n=clicks,
-        lang=lang
+        n=clicks
     )
-    text = _("This is clicker.\n\n", lang=lang) + text.format(number=clicks)
+    text = _("This is clicker.\n\n") + text.format(number=clicks)
     bot.edit_message_text(text, call.from_user.id, call.message.message_id,
-                          reply_markup=keyboards.clicker_keyboard(_, lang))
+                          reply_markup=keyboards.clicker_keyboard(_))
 
 
 if __name__ == '__main__':

telebot/asyncio_filters.py

@@ -39,7 +39,7 @@ class TextFilter:
     """
     Advanced text filter to check (types.Message, types.CallbackQuery, types.InlineQuery, types.Poll)
 
-    example of usage is in examples/custom_filters/advanced_text_filter.py
+    example of usage is in examples/asynchronous_telebot/custom_filters/advanced_text_filter.py
     """
 
     def __init__(self,

telebot/custom_filters.py

@@ -69,7 +69,7 @@ class TextFilter:
         self.ends_with = self._check_iterable(ends_with, filter_name='ends_with')
         self.ignore_case = ignore_case
 
-    def _check_iterable(self, iterable, filter_name: str):
+    def _check_iterable(self, iterable, filter_name):
         if not iterable:
             pass
         elif not isinstance(iterable, str) and not isinstance(iterable, list) and not isinstance(iterable, tuple):
@@ -95,39 +95,33 @@ class TextFilter:
 
         if self.ignore_case:
             text = text.lower()
-
-            if self.equals:
-                self.equals = self.equals.lower()
-            elif self.contains:
-                self.contains = tuple(map(str.lower, self.contains))
-            elif self.starts_with:
-                self.starts_with = tuple(map(str.lower, self.starts_with))
-            elif self.ends_with:
-                self.ends_with = tuple(map(str.lower, self.ends_with))
+            prepare_func = lambda string: str(string).lower()
+        else:
+            prepare_func = str
 
         if self.equals:
-            result = self.equals == text
+            result = prepare_func(self.equals) == text
             if result:
                 return True
             elif not result and not any((self.contains, self.starts_with, self.ends_with)):
                 return False
 
         if self.contains:
-            result = any([i in text for i in self.contains])
+            result = any([prepare_func(i) in text for i in self.contains])
             if result:
                 return True
             elif not result and not any((self.starts_with, self.ends_with)):
                 return False
 
         if self.starts_with:
-            result = any([text.startswith(i) for i in self.starts_with])
+            result = any([text.startswith(prepare_func(i)) for i in self.starts_with])
             if result:
                 return True
             elif not result and not self.ends_with:
                 return False
 
         if self.ends_with:
-            return any([text.endswith(i) for i in self.ends_with])
+            return any([text.endswith(prepare_func(i)) for i in self.ends_with])
 
         return False