Add support for slash-command groups on cogs

Author: HexF

discord/cog.py

@@ -29,7 +29,7 @@
 import discord.utils
 import types
 from . import errors
-from .commands import SlashCommand, UserCommand, MessageCommand, ApplicationCommand
+from .commands import SlashCommand, UserCommand, MessageCommand, ApplicationCommand, SlashCommandGroup
 
 from typing import Any, Callable, Mapping, ClassVar, Dict, Generator, List, Optional, TYPE_CHECKING, Tuple, TypeVar, Type
 
@@ -145,6 +145,13 @@ def __new__(cls: Type[CogMeta], *args: Any, **kwargs: Any) -> CogMeta:
                 if elem in listeners:
                     del listeners[elem]
 
+                try:
+                    if getattr(value, "parent") is not None:
+                        # Skip commands if they are apart of a group
+                        continue
+                except AttributeError:
+                    pass
+
                 is_static_method = isinstance(value, staticmethod)
                 if is_static_method:
                     value = value.__func__
@@ -445,7 +452,8 @@ def _inject(self: CogT, bot) -> CogT:
         # we've added so far for some form of atomic loading.
 
         for index, command in enumerate(self.__cog_commands__):
-            command.cog = self
+            command._set_cog(self)
+
             if not isinstance(command, ApplicationCommand):
                 if command.parent is None:
                     try:

discord/commands/commands.py

@@ -317,6 +317,9 @@ def qualified_name(self) -> str:
         else:
             return self.name
 
+    def _set_cog(self, cog):
+        self.cog = cog
+
 class SlashCommand(ApplicationCommand):
     r"""A class that implements the protocol for a slash command.
 
@@ -771,6 +774,7 @@ def to_dict(self) -> Dict:
             "name": self.name,
             "description": self.description,
             "options": [c.to_dict() for c in self.subcommands],
+            "default_permission": self.default_permission
         }
 
         if self.parent is not None:
@@ -848,6 +852,49 @@ async def invoke_autocomplete_callback(self, ctx: AutocompleteContext) -> None:
         ctx.interaction.data = option
         await command.invoke_autocomplete_callback(ctx)
 
+    def copy(self):
+        """Creates a copy of this command group.
+
+        Returns
+        --------
+        :class:`SlashCommandGroup`
+            A new instance of this command.
+        """
+        ret = self.__class__(
+            self.name,
+            self.description,
+            **self.__original_kwargs__)
+        return self._ensure_assignment_on_copy(ret)
+
+    def _ensure_assignment_on_copy(self, other):
+        other.parent = self.parent
+
+        other._before_invoke = self._before_invoke
+        other._after_invoke = self._after_invoke
+
+        if self.subcommands != other.subcommands:
+            other.subcommands = self.subcommands.copy()
+        
+        if self.checks != other.checks:
+            other.checks = self.checks.copy()
+
+        return other
+
+    def _update_copy(self, kwargs: Dict[str, Any]):
+        if kwargs:
+            kw = kwargs.copy()
+            kw.update(self.__original_kwargs__)
+            copy = self.__class__(self.callback, **kw)
+            return self._ensure_assignment_on_copy(copy)
+        else:
+            return self.copy()
+
+    def _set_cog(self, cog):
+        self.cog = cog
+        for subcommand in self.subcommands:
+            subcommand._set_cog(cog)
+        
+
 
 class ContextMenuCommand(ApplicationCommand):
     r"""A class that implements the protocol for context menu commands.

examples/app_commands/slash_cog_groups.py

@@ -0,0 +1,44 @@
+from discord.commands.permissions import Permission
+import discord
+from discord.commands.commands import SlashCommandGroup
+from discord.ext import commands
+
+# Set these
+GUILD_ID=0
+OWNER_ID=0
+
+bot = discord.Bot(debug_guild=GUILD_ID, owner_id=OWNER_ID)
+
+class Example(commands.Cog):
+    def __init__(self, bot):
+        self.bot = bot
+
+    greetings = SlashCommandGroup("greetings", "Various greeting from cogs!")
+    international_greetings = greetings.command_group("international", "International greetings")
+
+    secret_greetings = SlashCommandGroup("secret_greetings", "Secret greetings", permissions=[
+        Permission("owner", 2, True) # Ensures the owner_id user can access this, and noone else
+    ])
+ 
+    @greetings.command()
+    async def hello(self, ctx):
+        await ctx.respond("Hi, this is a slash command from a cog!")
+
+    @international_greetings.command()
+    async def aloha(self, ctx):
+        await ctx.respond("Aloha, a Hawaiian greeting")
+    
+
+    @greetings.command()
+    async def hi(self, ctx):
+        await ctx.respond(f"Hi, this is a slash sub-command from a cog!")
+
+    @secret_greetings.command()
+    async def secret_handshake(self, ctx, member: discord.Member):
+        await ctx.respond(f"{member.mention} secret handshakes you")
+
+
+bot.add_cog(Example(bot))
+
+
+bot.run("TOKEN")