fix: new_text_message() may create messages with empty contents

Author: IthacaDream

src/ghoshell_moss/message/utils.py

@@ -10,6 +10,6 @@ def new_text_message(content: str, *, role: str | Role = "") -> Message:
     """
     创建一个系统消息.
     """
-    meta = MessageMeta(role=str(role))
+    meta = MessageMeta(role=role.value if isinstance(role, Role) else str(role))
     obj = Text(text=content)
-    return Message(meta=meta).as_completed([obj.to_content()])
+    return Message(meta=meta, seq="head").as_completed([obj.to_content()])

tests/channels/test_py_channel.py

@@ -219,3 +219,5 @@ def foo() -> list[Message]:
         # 更新后, messages 也变更了.
         await broker.refresh_meta()
         assert len(broker.meta().context) == 2
+        assert broker.meta().context[0].contents == [{"type": "text", "data": {"text": "hello"}}]
+        assert broker.meta().context[1].contents == [{"type": "text", "data": {"text": "world"}}]