Some more type refining

lib/rollbot/types.py

@@ -28,8 +28,8 @@ class Message:
 class Response:
     origin_id: str
     channel_id: str
-    text: Optional[str]
-    attachments: list[Attachment]
+    text: Optional[str] = None
+    attachments: Optional[list[Attachment]] = None
 
     @staticmethod
     def from_message(msg: Message, text: Optional[str] = None, attachments: list[Attachment] = None) -> "Response":
@@ -54,9 +54,28 @@ StartupShutdownType = Callable[[Context], Coroutine[None, None, None]]
 
 @dataclass
 class CommandConfiguration:
-    commands: dict[str, CommandType]
-    call_and_response: dict[str, str]
-    aliases: dict[str, str]
+    commands: dict[str, CommandType] = field(default_factory=dict)
+    call_and_response: dict[str, str] = field(default_factory=dict)
+    aliases: dict[str, str] = field(default_factory=dict)
     bangs: Container[str] = ("!",)
     startup: list[StartupShutdownType] = field(default_factory=list)
-    shutdown: list[StartupShutdownType] = field(default_factory=list)
+    shutdown: list[StartupShutdownType] = field(default_factory=list)
+
+    def extend(self, other: "CommandConfiguration") -> "CommandConfiguration":
+        return CommandConfiguration(
+            commands={
+                **self.commands,
+                **other.commands,
+            },
+            call_and_response={
+                **self.call_and_response,
+                **other.call_and_response,
+            },
+            aliases={
+                **self.aliases,
+                **other.aliases,
+            },
+            bangs=(*self.bangs, *other.bangs),
+            startup=[*self.startup, *other.startup],
+            shutdown=[*self.shutdown, *other.shutdown],
+        )