Expose a pylsp_shutdown() hook

This allows plugins to perform some operations (e.g. terminating
a daemon process or cleaning temporary resources) upon LSP server
shutdown.

Author: dlax

pylsp/hookspecs.py

@@ -138,3 +138,8 @@ def pylsp_signature_help(config, workspace, document, position) -> None:
 @hookspec
 def pylsp_workspace_configuration_changed(config, workspace) -> None:
     pass
+
+
+@hookspec
+def pylsp_shutdown(config, workspace) -> None:
+    pass

pylsp/python_lsp.py

@@ -237,6 +237,7 @@ def __getitem__(self, item):
     def m_shutdown(self, **_kwargs) -> None:
         for workspace in self.workspaces.values():
             workspace.close()
+        self._hook("pylsp_shutdown")
         self._shutdown = True
 
     def m_invalid_request_after_shutdown(self, **_kwargs):