⚡ improve plugin system (#1011)

nonebot/plugin/plugin.py

@@ -6,18 +6,16 @@ FrontMatter:
 """
 from types import ModuleType
 from dataclasses import field, dataclass
-from typing import TYPE_CHECKING, Set, Dict, Type, Optional
+from typing import TYPE_CHECKING, Set, Type, Optional
 
 from nonebot.matcher import Matcher
 
 from .export import Export
+from . import _plugins as plugins  # FIXME: backport for nonebug
 
 if TYPE_CHECKING:
     from .manager import PluginManager
 
-plugins: Dict[str, "Plugin"] = {}
-"""已加载的插件"""
-
 
 @dataclass(eq=False)
 class Plugin(object):
@@ -32,40 +30,10 @@ class Plugin(object):
     manager: "PluginManager"
     """导入该插件的插件管理器"""
     export: Export = field(default_factory=Export)
-    """插件内定义的导出内容"""
+    """**Deprecated:** 插件内定义的导出内容"""
     matcher: Set[Type[Matcher]] = field(default_factory=set)
     """插件内定义的 `Matcher`"""
     parent_plugin: Optional["Plugin"] = None
     """父插件"""
     sub_plugins: Set["Plugin"] = field(default_factory=set)
     """子插件集合"""
-
-
-def get_plugin(name: str) -> Optional[Plugin]:
-    """获取已经导入的某个插件。
-
-    如果为 `load_plugins` 文件夹导入的插件，则为文件(夹)名。
-
-    参数:
-        name: 插件名，即 {ref}`nonebot.plugin.plugin.Plugin.name`。
-    """
-    return plugins.get(name)
-
-
-def get_loaded_plugins() -> Set[Plugin]:
-    """获取当前已导入的所有插件。"""
-    return set(plugins.values())
-
-
-def _new_plugin(fullname: str, module: ModuleType, manager: "PluginManager") -> Plugin:
-    name = fullname.rsplit(".", 1)[-1] if "." in fullname else fullname
-    if name in plugins:
-        raise RuntimeError("Plugin already exists! Check your plugin name.")
-    plugin = Plugin(name, module, fullname, manager)
-    return plugin
-
-
-def _confirm_plugin(plugin: Plugin) -> None:
-    if plugin.name in plugins:
-        raise RuntimeError("Plugin already exists! Check your plugin name.")
-    plugins[plugin.name] = plugin