✨ Allow for functools.partials and such as autocomplete

Author: Paillat-dev

discord/commands/core.py

@@ -1095,7 +1095,7 @@ async def invoke_autocomplete_callback(self, ctx: AutocompleteContext):
                 ctx.value = op.get("value")
                 ctx.options = values
 
-                if len(inspect.signature(option.autocomplete).parameters) == 2:
+                if option.autocomplete._is_instance_method:
                     instance = getattr(option.autocomplete, "__self__", ctx.cog)
                     result = option.autocomplete(instance, ctx)
                 else:

discord/commands/options.py

@@ -285,6 +285,20 @@ def __init__(
                 for o in kwargs.pop("choices", [])
             ]
 
+        # this is done here so it does not have to be computed every time the autocomplete is invoked
+        if self.autocomplete:
+            self.autocomplete._is_instance_method: bool = (
+                sum(
+                    1
+                    for param in inspect.signature(
+                        self.autocomplete
+                    ).parameters.values()
+                    if param.default == param.empty
+                    and param.kind not in (param.VAR_POSITIONAL, param.VAR_KEYWORD)
+                )
+                == 2
+            )
+
         if self.input_type == SlashCommandOptionType.integer:
             minmax_types = (int, type(None))
             minmax_typehint = Optional[int]