Move bot_in_a_guild from redbot.core.checks to redbot.core.commands (#4515)

redbot/core/commands/__init__.py

@@ -52,6 +52,7 @@ from .requires import (
     Requires as Requires,
     permissions_check as permissions_check,
     bot_has_permissions as bot_has_permissions,
+    bot_in_a_guild as bot_in_a_guild,
     has_permissions as has_permissions,
     has_guild_permissions as has_guild_permissions,
     is_owner as is_owner,

redbot/core/commands/requires.py

@@ -11,22 +11,23 @@ import enum
 import inspect
 from collections import ChainMap
 from typing import (
-    Union,
-    Optional,
-    List,
-    Callable,
-    Awaitable,
-    Dict,
-    Any,
     TYPE_CHECKING,
-    TypeVar,
-    Tuple,
+    Any,
+    Awaitable,
+    Callable,
     ClassVar,
+    Dict,
+    List,
     Mapping,
+    Optional,
+    Tuple,
+    TypeVar,
+    Union,
 )
 
 import discord
 
+from discord.ext.commands import check
 from .converter import GuildConverter
 from .errors import BotMissingPermissions
 
@@ -47,6 +48,7 @@ __all__ = [
     "Requires",
     "permissions_check",
     "bot_has_permissions",
+    "bot_in_a_guild",
     "has_permissions",
     "has_guild_permissions",
     "is_owner",
@@ -705,6 +707,15 @@ def bot_has_permissions(**perms: bool):
     return decorator
 
 
+def bot_in_a_guild():
+    """Deny the command if the bot is not in a guild."""
+
+    async def predicate(ctx):
+        return len(ctx.bot.guilds) > 0
+
+    return check(predicate)
+
+
 def has_permissions(**perms: bool):
     """Restrict the command to users with these permissions.