Enhance keyboard utility, improved documentation for this utility.

Updated the 'aiogram/utils/keyboard.py' file with new methods for integrating buttons and keyboard creation more seamlessly. Added functionality to create buttons from existing markup and attach another builder. This improvement aims to make the keyboard building process more user-friendly and flexible.

aiogram/utils/keyboard.py

@@ -236,6 +236,12 @@ class KeyboardBuilder(Generic[ButtonType]):
         return self
 
     def button(self, **kwargs: Any) -> "KeyboardBuilder[ButtonType]":
+        """
+        Add button to markup
+
+        :param kwargs:
+        :return:
+        """
         if isinstance(callback_data := kwargs.get("callback_data", None), CallbackData):
             kwargs["callback_data"] = callback_data.pack()
         button = self._button_type(**kwargs)
@@ -246,6 +252,17 @@ class KeyboardBuilder(Generic[ButtonType]):
             return ReplyKeyboardMarkup(keyboard=self.export(), **kwargs)
         return InlineKeyboardMarkup(inline_keyboard=self.export())
 
+    def attach(self, builder: "KeyboardBuilder[ButtonType]") -> "KeyboardBuilder[ButtonType]":
+        if not isinstance(builder, KeyboardBuilder):
+            raise ValueError(f"Only KeyboardBuilder can be attached, not {type(builder).__name__}")
+        if builder._button_type is not self._button_type:
+            raise ValueError(
+                f"Only builders with same button type can be attached, "
+                f"not {self._button_type.__name__} and {builder._button_type.__name__}"
+            )
+        self._markup.extend(builder.export())
+        return self
+
 
 def repeat_last(items: Iterable[T]) -> Generator[T, None, None]:
     items_iter = iter(items)
@@ -303,6 +320,18 @@ class InlineKeyboardBuilder(KeyboardBuilder[InlineKeyboardButton]):
         """
         return InlineKeyboardBuilder(markup=self.export())
 
+    @classmethod
+    def from_markup(
+        cls: Type["InlineKeyboardBuilder"], markup: InlineKeyboardMarkup
+    ) -> "InlineKeyboardBuilder":
+        """
+        Create builder from existing markup
+
+        :param markup:
+        :return:
+        """
+        return cls(markup=markup.inline_keyboard)
+
 
 class ReplyKeyboardBuilder(KeyboardBuilder[KeyboardButton]):
     """
@@ -336,3 +365,13 @@ class ReplyKeyboardBuilder(KeyboardBuilder[KeyboardButton]):
         :return:
         """
         return ReplyKeyboardBuilder(markup=self.export())
+
+    @classmethod
+    def from_markup(cls, markup: ReplyKeyboardMarkup) -> "ReplyKeyboardBuilder":
+        """
+        Create builder from existing markup
+
+        :param markup:
+        :return:
+        """
+        return cls(markup=markup.keyboard)

docs/utils/keyboard.rst

@@ -14,6 +14,8 @@ Keyboard builder helps to dynamically generate markup.
 Usage example
 =============
 
+For example you want to generate inline keyboard with 10 buttons
+
 .. code-block:: python
 
     builder = InlineKeyboardBuilder()
@@ -21,22 +23,45 @@ Usage example
     for index in range(1, 11):
         builder.button(text=f"Set {index}", callback_data=f"set:{index}")
 
+
+then adjust this buttons to some grid, for example first line will have 3 buttons, the next lines will have 2 buttons
+
+.. code-block::
+
     builder.adjust(3, 2)
 
+also you can attach another builder to this one
+
+.. code-block:: python
+
+    another_builder = InlineKeyboardBuilder(...)...  # Another builder with some buttons
+    builder.attach(another_builder)
+
+or you can attach some already generated markup
+
+.. code-block:: python
+
+    markup = InlineKeyboardMarkup(inline_keyboard=[...])  # Some markup
+    builder.attach(InlineKeyboardBuilder.from_markup(markup))
+
+and finally you can export this markup to use it in your message
+
+.. code-block:: python
+
     await message.answer("Some text here", reply_markup=builder.as_markup())
 
+Reply keyboard builder has the same interface
+
+.. warning::
+
+    Note that you can't attach reply keyboard builder to inline keyboard builder and vice versa
 
-Base builder
-============
-.. autoclass:: aiogram.utils.keyboard.ReplyKeyboardBuilder
-    :members: __init__, buttons, copy, export, add, row, adjust, button, as_markup
-    :undoc-members: True
 
 Inline Keyboard
 ===============
 
 .. autoclass:: aiogram.utils.keyboard.InlineKeyboardBuilder
-    :noindex:
+    :members: __init__, buttons, copy, export, add, row, adjust, from_markup, attach
 
     .. method:: button(text: str, url: Optional[str] = None, login_url: Optional[LoginUrl] = None, callback_data: Optional[Union[str, CallbackData]] = None, switch_inline_query: Optional[str] = None, switch_inline_query_current_chat: Optional[str] = None, callback_game: Optional[CallbackGame] = None, pay: Optional[bool] = None, **kwargs: Any) -> aiogram.utils.keyboard.InlineKeyboardBuilder
         :noindex:
@@ -52,7 +77,7 @@ Reply Keyboard
 ==============
 
 .. autoclass:: aiogram.utils.keyboard.ReplyKeyboardBuilder
-    :noindex:
+    :members: __init__, buttons, copy, export, add, row, adjust, from_markup, attach
 
     .. method:: button(text: str, request_contact: Optional[bool] = None, request_location: Optional[bool] = None, request_poll: Optional[KeyboardButtonPollType] = None, **kwargs: Any) -> aiogram.utils.keyboard.ReplyKeyboardBuilder
         :noindex:

tests/test_api/test_types/test_chat_join_request.py

@@ -24,11 +24,7 @@ from aiogram.methods import (
     SendVideoNote,
     SendVoice,
 )
-from aiogram.types import (
-    Chat,
-    ChatJoinRequest,
-    User,
-)
+from aiogram.types import Chat, ChatJoinRequest, User
 
 
 class TestChatJoinRequest: