New discord.Thread additions (Pycord-Development#1447)

* First additions

* Update state.py

discord/message.py

@@ -657,6 +657,10 @@ class Message(Hashable):
         The guild that the message belongs to, if applicable.
     interaction: Optional[:class:`MessageInteraction`]
         The interaction associated with the message, if applicable.
+    thread: Optional[:class:`Thread`]
+        The thread created from this message, if applicable.
+
+        .. versionadded:: 2.0
     """
 
     __slots__ = (
@@ -691,6 +695,7 @@ class Message(Hashable):
         "components",
         "guild",
         "interaction",
+        "thread",
     )
 
     if TYPE_CHECKING:
@@ -766,6 +771,12 @@ def __init__(
         except KeyError:
             self.interaction = None
 
+        self.thread: Optional[Thread]
+        try:
+            self.thread = Thread(guild=self.guild, state=self._state, data=data["thread"])
+        except KeyError:
+            self.thread = None
+
         for handler in ("author", "member", "mentions", "mention_roles"):
             try:
                 getattr(self, f"_handle_{handler}")(data[handler])
@@ -1590,13 +1601,16 @@ async def create_thread(self, *, name: str, auto_archive_duration: ThreadArchive
         default_auto_archive_duration: ThreadArchiveDuration = getattr(
             self.channel, "default_auto_archive_duration", 1440
         )
+
         data = await self._state.http.start_thread_with_message(
             self.channel.id,
             self.id,
             name=name,
             auto_archive_duration=auto_archive_duration or default_auto_archive_duration,
         )
-        return Thread(guild=self.guild, state=self._state, data=data)
+
+        self.thread = Thread(guild=self.guild, state=self._state, data=data)
+        return self.thread
 
     async def reply(self, content: Optional[str] = None, **kwargs) -> Message:
         """|coro|

discord/state.py

@@ -948,6 +948,9 @@ def parse_thread_delete(self, data) -> None:
             guild._remove_thread(thread)  # type: ignore
             self.dispatch("thread_delete", thread)
 
+            if (msg := thread.starting_message) is not None:
+                msg.thread = None
+
     def parse_thread_list_sync(self, data) -> None:
         guild_id = int(data["guild_id"])
         guild: Optional[Guild] = self._get_guild(guild_id)

discord/threads.py

@@ -86,6 +86,10 @@ class Thread(Messageable, Hashable):
         The guild the thread belongs to.
     id: :class:`int`
         The thread ID.
+
+        .. note::
+            This ID is the same as the thread starting message ID.
+
     parent_id: :class:`int`
         The parent :class:`TextChannel` ID this thread belongs to.
     owner_id: :class:`int`
@@ -260,7 +264,7 @@ def members(self) -> List[ThreadMember]:
 
     @property
     def last_message(self) -> Optional[Message]:
-        """Fetches the last message from this channel in cache.
+        """Returns the last message from this thread in cache.
 
         The message might not be valid or point to an existing message.
 
@@ -273,7 +277,7 @@ def last_message(self) -> Optional[Message]:
             attribute.
 
         Returns
-        ---------
+        --------
         Optional[:class:`Message`]
             The last message in this channel or ``None`` if not found.
         """
@@ -289,7 +293,7 @@ def category(self) -> Optional[CategoryChannel]:
             The parent channel was not cached and returned ``None``.
 
         Returns
-        -------
+        --------
         Optional[:class:`CategoryChannel`]
             The parent channel's category.
         """
@@ -309,7 +313,7 @@ def category_id(self) -> Optional[int]:
             The parent channel was not cached and returned ``None``.
 
         Returns
-        -------
+        --------
         Optional[:class:`int`]
             The parent channel's category ID.
         """
@@ -319,6 +323,22 @@ def category_id(self) -> Optional[int]:
             raise ClientException("Parent channel not found")
         return parent.category_id
 
+    @property
+    def starting_message(self) -> Optional[Message]:
+        """Returns the message that started this thread.
+
+        The message might not be valid or point to an existing message.
+
+        .. note::
+            The ID for this message is the same as the thread ID.
+
+        Returns
+        --------
+        Optional[:class:`Message`]
+            The message that started this thread or ``None`` if not found in the cache.
+        """
+        return self._state._get_message(self.id)
+
     def is_private(self) -> bool:
         """:class:`bool`: Whether the thread is a private thread.
 

discord/types/message.py

@@ -34,6 +34,7 @@
 from .member import Member, UserWithMember
 from .snowflake import Snowflake, SnowflakeList
 from .sticker import StickerItem
+from .threads import Thread
 from .user import User
 
 if TYPE_CHECKING:
@@ -110,6 +111,7 @@ class _MessageOptional(TypedDict, total=False):
     referenced_message: Optional[Message]
     interaction: MessageInteraction
     components: List[Component]
+    thread: Optional[Thread]
 
 
 MessageType = Literal[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 18, 19, 20, 21]