⚗️ add new builtin plugin

nonebot/plugins/single_session.py

@@ -0,0 +1,20 @@
+from typing import Dict, Optional
+
+from nonebot.typing import T_State
+from nonebot.matcher import Matcher
+from nonebot.adapters import Bot, Event
+from nonebot.message import run_preprocessor, run_postprocessor, IgnoredException
+
+_running_matcher: Dict[str, bool] = {}
+
+
+@run_preprocessor
+async def _(matcher: Matcher, bot: Bot, event: Event, state: T_State):
+    # TODO
+    pass
+
+
+@run_postprocessor
+async def _(matcher: Matcher, exception: Optional[Exception], bot: Bot, event: Event, state: T_State):
+    # TODO
+    pass