From f8304406c52deafa5a91cbb66dd35077ce1a76cd Mon Sep 17 00:00:00 2001
From: yanyongyu <yanyongyu_1@126.com>
Date: Mon, 25 Jan 2021 18:15:25 +0800
Subject: [PATCH] :alembic: add new builtin plugin

---
 nonebot/plugin.py                    |  4 ++--
 nonebot/plugin.pyi                   |  2 +-
 nonebot/plugins/{base.py => echo.py} |  0
 nonebot/plugins/single_session.py    | 20 ++++++++++++++++++++
 4 files changed, 23 insertions(+), 3 deletions(-)
 rename nonebot/plugins/{base.py => echo.py} (100%)
 create mode 100644 nonebot/plugins/single_session.py

diff --git a/nonebot/plugin.py b/nonebot/plugin.py
index 560d8009..f496e192 100644
--- a/nonebot/plugin.py
+++ b/nonebot/plugin.py
@@ -933,7 +933,7 @@ def load_plugins(*plugin_dir: str) -> Set[Plugin]:
     return loaded_plugins
 
 
-def load_builtin_plugins() -> Optional[Plugin]:
+def load_builtin_plugins(name: str = "echo") -> Optional[Plugin]:
     """
     :说明:
 
@@ -943,7 +943,7 @@ def load_builtin_plugins() -> Optional[Plugin]:
 
       - ``Plugin``
     """
-    return load_plugin("nonebot.plugins.base")
+    return load_plugin(f"nonebot.plugins.{name}")
 
 
 def get_plugin(name: str) -> Optional[Plugin]:
diff --git a/nonebot/plugin.pyi b/nonebot/plugin.pyi
index db31ad3d..85d925bf 100644
--- a/nonebot/plugin.pyi
+++ b/nonebot/plugin.pyi
@@ -168,7 +168,7 @@ def load_plugins(*plugin_dir: str) -> Set[Plugin]:
     ...
 
 
-def load_builtin_plugins():
+def load_builtin_plugins(name: str = ...):
     ...
 
 
diff --git a/nonebot/plugins/base.py b/nonebot/plugins/echo.py
similarity index 100%
rename from nonebot/plugins/base.py
rename to nonebot/plugins/echo.py
diff --git a/nonebot/plugins/single_session.py b/nonebot/plugins/single_session.py
new file mode 100644
index 00000000..20eca034
--- /dev/null
+++ b/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