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[lsp-test.git] / src / Language / Haskell / LSP / Test / Session.hs

diff --git a/src/Language/Haskell/LSP/Test/Session.hs b/src/Language/Haskell/LSP/Test/Session.hs
index a2cd380bf920bbd38d2889db8a671c0338f98d33..291a3e0bcaa990327988f2bcbd9df6554a63f50f 100644 (file)
--- a/src/Language/Haskell/LSP/Test/Session.hs
+++ b/src/Language/Haskell/LSP/Test/Session.hs
@@ -1,7 +1,9 @@
+{-# LANGUAGE CPP               #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE RankNTypes #-}
 
 module Language.Haskell.LSP.Test.Session
   ( Session
@@ -32,6 +34,9 @@ import Control.Lens hiding (List)
 import Control.Monad
 import Control.Monad.IO.Class
 import Control.Monad.Except
+#if __GLASGOW_HASKELL__ >= 806
+import Control.Monad.Fail
+#endif
 import Control.Monad.Trans.Reader (ReaderT, runReaderT)
 import qualified Control.Monad.Trans.Reader as Reader (ask)
 import Control.Monad.Trans.State (StateT, runStateT)
@@ -63,23 +68,32 @@ import System.IO
 
 -- | A session representing one instance of launching and connecting to a server.
 --
--- You can send and receive messages to the server within 'Session' via 'getMessage',
--- 'sendRequest' and 'sendNotification'.
---
+-- You can send and receive messages to the server within 'Session' via
+-- 'Language.Haskell.LSP.Test.message',
+-- 'Language.Haskell.LSP.Test.sendRequest' and
+-- 'Language.Haskell.LSP.Test.sendNotification'.
 
 type Session = ParserStateReader FromServerMessage SessionState SessionContext IO
 
+#if __GLASGOW_HASKELL__ >= 806
+instance MonadFail Session where
+  fail s = do
+    lastMsg <- fromJust . lastReceivedMessage <$> get
+    liftIO $ throw (UnexpectedMessage s lastMsg)
+#endif
+
 -- | Stuff you can configure for a 'Session'.
 data SessionConfig = SessionConfig
   { messageTimeout :: Int  -- ^ Maximum time to wait for a message in seconds, defaults to 60.
   , logStdErr      :: Bool -- ^ Redirect the server's stderr to this stdout, defaults to False.
   , logMessages    :: Bool -- ^ Trace the messages sent and received to stdout, defaults to False.
   , logColor       :: Bool -- ^ Add ANSI color to the logged messages, defaults to True.
+  , lspConfig      :: Maybe Value -- ^ The initial LSP config as JSON value, defaults to Nothing.
   }
 
 -- | The configuration used in 'Language.Haskell.LSP.Test.runSession'.
 defaultConfig :: SessionConfig
-defaultConfig = SessionConfig 60 False False True
+defaultConfig = SessionConfig 60 False False True Nothing
 
 instance Default SessionConfig where
   def = defaultConfig
@@ -188,13 +202,14 @@ runSessionWithHandles serverIn serverOut serverHandler config caps rootDir sessi
   messageChan <- newChan
   initRsp <- newEmptyMVar
 
+  mainThreadId <- myThreadId
+
   let context = SessionContext serverIn absRootDir messageChan reqMap initRsp config caps
       initState = SessionState (IdInt 0) mempty mempty 0 False Nothing
-
-  threadId <- forkIO $ void $ serverHandler serverOut context
-  (result, _) <- runSession context initState session
-
-  killThread threadId
+      launchServerHandler = forkIO $ catch (serverHandler serverOut context)
+                                           (throwTo mainThreadId :: SessionException -> IO ())
+  (result, _) <- bracket launchServerHandler killThread $
+    const $ runSession context initState session
 
   return result
 
@@ -282,7 +297,7 @@ sendMessage msg = do
   logMsg LogClient msg
   liftIO $ B.hPut h (addHeader $ encode msg)
 
--- | Execute a block f that will throw a 'TimeoutException'
+-- | Execute a block f that will throw a 'Timeout' exception
 -- after duration seconds. This will override the global timeout
 -- for waiting for messages to arrive defined in 'SessionConfig'.
 withTimeout :: Int -> Session a -> Session a
@@ -321,3 +336,4 @@ logMsg t msg = do
           | otherwise       = Cyan
 
         showPretty = B.unpack . encodePretty
+