Add t.me links for User, Chat and Message if available and update User.mention_* (#1092)

* Add User.link and update User.mention_*
* Add Chat.link
* Add Message.link
* Link returns None on default
* Add test link

telegram/chat.py

@@ -116,6 +116,14 @@ class Chat(TelegramObject):
         self.bot = bot
         self._id_attrs = (self.id,)
 
+    @property
+    def link(self):
+        """:obj:`str`: Convenience property. If the chat has a :attr:`username`, returns a t.me
+        link of the chat."""
+        if self.username:
+            return "https://t.me/{}".format(self.username)
+        return None
+
     @classmethod
     def de_json(cls, data, bot):
         if not data:

telegram/message.py

@@ -303,6 +303,14 @@ class Message(TelegramObject):
         """:obj:`int`: Shortcut for :attr:`telegram.Chat.id` for :attr:`chat`."""
         return self.chat.id
 
+    @property
+    def link(self):
+        """:obj:`str`: Convenience property. If the chat of the message is a supergroup or a
+        channel and has a :attr:`Chat.username`, returns a t.me link of the message."""
+        if self.chat.type in (Chat.SUPERGROUP, Chat.CHANNEL) and self.chat.username:
+            return "https://t.me/{}/{}".format(self.chat.username, self.message_id)
+        return None
+
     @classmethod
     def de_json(cls, data, bot):
         if not data:

telegram/user.py

@@ -71,26 +71,30 @@ class User(TelegramObject):
 
     @property
     def name(self):
-        """
-        :obj:`str`: Convenience property. If available, returns the user's :attr:`username`
-            prefixed with "@". If :attr:`username` is not available, returns :attr:`full_name`.
-
-        """
+        """:obj:`str`: Convenience property. If available, returns the user's :attr:`username`
+        prefixed with "@". If :attr:`username` is not available, returns :attr:`full_name`."""
         if self.username:
             return '@{}'.format(self.username)
         return self.full_name
 
     @property
     def full_name(self):
-        """
-        :obj:`str`: Convenience property. The user's :attr:`first_name`, followed by (if available)
-            :attr:`last_name`.
+        """:obj:`str`: Convenience property. The user's :attr:`first_name`, followed by (if
+        available) :attr:`last_name`."""
 
-        """
         if self.last_name:
             return u'{} {}'.format(self.first_name, self.last_name)
         return self.first_name
 
+    @property
+    def link(self):
+        """:obj:`str`: Convenience property. If :attr:`username` is available, returns a t.me link
+        of the user."""
+
+        if self.username:
+            return "https://t.me/{}".format(self.username)
+        return None
+
     @classmethod
     def de_json(cls, data, bot):
         if not data:
@@ -124,28 +128,28 @@ class User(TelegramObject):
     def mention_markdown(self, name=None):
         """
         Args:
-            name (:obj:`str`): If provided, will overwrite the user's name.
+            name (:obj:`str`): The name used as a link for the user. Defaults to :attr:`full_name`.
 
         Returns:
             :obj:`str`: The inline mention for the user as markdown.
+
         """
-        if not name:
-            return util_mention_markdown(self.id, self.name)
-        else:
+        if name:
             return util_mention_markdown(self.id, name)
+        return util_mention_markdown(self.id, self.full_name)
 
     def mention_html(self, name=None):
         """
         Args:
-            name (:obj:`str`): If provided, will overwrite the user's name.
+            name (:obj:`str`): The name used as a link for the user. Defaults to :attr:`full_name`.
 
         Returns:
             :obj:`str`: The inline mention for the user as HTML.
+
         """
-        if not name:
-            return util_mention_html(self.id, self.name)
-        else:
+        if name:
             return util_mention_html(self.id, name)
+        return util_mention_html(self.id, self.full_name)
 
     def send_message(self, *args, **kwargs):
         """Shortcut for::

tests/test_chat.py

@@ -25,7 +25,7 @@ from telegram import User
 
 @pytest.fixture(scope='class')
 def chat(bot):
-    return Chat(TestChat.id, TestChat.title, TestChat.type,
+    return Chat(TestChat.id, TestChat.title, TestChat.type, username=TestChat.username,
                 all_members_are_administrators=TestChat.all_members_are_administrators,
                 bot=bot, sticker_set_name=TestChat.sticker_set_name,
                 can_set_sticker_set=TestChat.can_set_sticker_set)
@@ -35,6 +35,7 @@ class TestChat(object):
     id = -28767330
     title = 'ToledosPalaceBot - Group'
     type = 'group'
+    username = 'username'
     all_members_are_administrators = False
     sticker_set_name = 'stickers'
     can_set_sticker_set = False
@@ -44,6 +45,7 @@ class TestChat(object):
             'id': self.id,
             'title': self.title,
             'type': self.type,
+            'username': self.username,
             'all_members_are_administrators': self.all_members_are_administrators,
             'sticker_set_name': self.sticker_set_name,
             'can_set_sticker_set': self.can_set_sticker_set
@@ -53,6 +55,7 @@ class TestChat(object):
         assert chat.id == self.id
         assert chat.title == self.title
         assert chat.type == self.type
+        assert chat.username == self.username
         assert chat.all_members_are_administrators == self.all_members_are_administrators
         assert chat.sticker_set_name == self.sticker_set_name
         assert chat.can_set_sticker_set == self.can_set_sticker_set
@@ -64,8 +67,14 @@ class TestChat(object):
         assert chat_dict['id'] == chat.id
         assert chat_dict['title'] == chat.title
         assert chat_dict['type'] == chat.type
+        assert chat_dict['username'] == chat.username
         assert chat_dict['all_members_are_administrators'] == chat.all_members_are_administrators
 
+    def test_link(self, chat):
+        assert chat.link == 'https://t.me/{}'.format(chat.username)
+        chat.username = None
+        assert chat.link is None
+
     def test_send_action(self, monkeypatch, chat):
         def test(*args, **kwargs):
             id = args[1] == chat.id

tests/test_message.py

@@ -282,6 +282,18 @@ class TestMessage(object):
     def test_chat_id(self, message):
         assert message.chat_id == message.chat.id
 
+    def test_link(self, message):
+        assert message.link is None
+        message.chat.username = 'username'
+        message.chat.type = 'supergroup'
+        assert message.link == 'https://t.me/{}/{}'.format(message.chat.username,
+                                                           message.message_id)
+        message.chat.type = 'channel'
+        assert message.link == 'https://t.me/{}/{}'.format(message.chat.username,
+                                                           message.message_id)
+        message.chat.type = 'private'
+        assert message.link is None
+
     def test_effective_attachment(self, message_params):
         for i in ('audio', 'game', 'document', 'photo', 'sticker', 'video', 'voice', 'video_note',
                   'contact', 'location', 'venue', 'invoice', 'invoice', 'successful_payment'):

tests/test_user.py

@@ -96,6 +96,11 @@ class TestUser(object):
         user.last_name = None
         assert user.full_name == u'first\u2022name'
 
+    def test_link(self, user):
+        assert user.link == 'https://t.me/{}'.format(user.username)
+        user.username = None
+        assert user.link is None
+
     def test_get_profile_photos(self, monkeypatch, user):
         def test(_, *args, **kwargs):
             return args[0] == user.id