Handle receiving messages in between the initialize sequence

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

diff --git a/src/Language/Haskell/LSP/Test/Exceptions.hs b/src/Language/Haskell/LSP/Test/Exceptions.hs
index dd31ea3cc155d879ba5366966b04e9b4ca5a4808..afb48dfd4ff883962c804549f969bf71fc92a8fe 100644 (file)
--- a/src/Language/Haskell/LSP/Test/Exceptions.hs
+++ b/src/Language/Haskell/LSP/Test/Exceptions.hs
@@ -11,7 +11,7 @@ import Data.List
 import qualified Data.ByteString.Lazy.Char8 as B
 
 -- | An exception that can be thrown during a 'Haskell.LSP.Test.Session.Session'
-data SessionException = Timeout
+data SessionException = Timeout (Maybe FromServerMessage)
                       | NoContentLengthHeader
                       | UnexpectedMessage String FromServerMessage
                       | ReplayOutOfOrder FromServerMessage [FromServerMessage]
@@ -19,17 +19,22 @@ data SessionException = Timeout
                       | IncorrectApplyEditRequest String
                       | UnexpectedResponseError LspIdRsp ResponseError
                       | UnexpectedServerTermination
+                      | IllegalInitSequenceMessage FromServerMessage
   deriving Eq
 
 instance Exception SessionException
 
 instance Show SessionException where
-  show Timeout = "Timed out waiting to receive a message from the server."
+  show (Timeout lastMsg) =
+    "Timed out waiting to receive a message from the server." ++
+    case lastMsg of
+      Just msg -> "\nLast message received:\n" ++ B.unpack (encodePretty msg)
+      Nothing -> mempty
   show NoContentLengthHeader = "Couldn't read Content-Length header from the server."
   show (UnexpectedMessage expected lastMsg) =
     "Received an unexpected message from the server:\n" ++
     "Was parsing: " ++ expected ++ "\n" ++
-    "Last message received: " ++ show lastMsg
+    "Last message received:\n" ++ B.unpack (encodePretty lastMsg)
   show (ReplayOutOfOrder received expected) =
     let expected' = nub expected
         getJsonDiff = lines . B.unpack . encodePretty
@@ -46,6 +51,9 @@ instance Show SessionException where
   show (UnexpectedResponseError lid e) = "Received an exepected error in a response for id " ++ show lid ++ ":\n"
                                           ++ show e
   show UnexpectedServerTermination = "Language server unexpectedly terminated"
+  show (IllegalInitSequenceMessage msg) =
+    "Received an illegal message between the initialize request and response:\n"
+      ++  B.unpack (encodePretty msg)
 
 -- | A predicate that matches on any 'SessionException'
 anySessionException :: SessionException -> Bool