+-- | Closes a text document and sends a notification to the client.
+closeDoc :: TextDocumentIdentifier -> Session ()
+closeDoc docId = do
+ let params = DidCloseTextDocumentParams (TextDocumentIdentifier (docId ^. uri))
+ sendNotification TextDocumentDidClose params
+
+ oldVfs <- vfs <$> get
+ let notif = NotificationMessage "" TextDocumentDidClose params
+ newVfs <- liftIO $ closeVFS oldVfs notif
+ modify $ \s -> s { vfs = newVfs }
+