X-Git-Url: http://git.lukelau.me/?a=blobdiff_plain;f=src%2FLanguage%2FHaskell%2FLSP%2FTest%2FExceptions.hs;h=e1e281fa435486e6bdd4bd4c9b9dfbcc2c1134d9;hb=eab96ad6f11e0f76380d9cc600724f94c4523915;hp=b337f0bee70032fc1b7595247966ca5a1ca6bedf;hpb=e2ae28cd825653b0cb8b982d113497e9ac795059;p=opengl.git

diff --git a/src/Language/Haskell/LSP/Test/Exceptions.hs b/src/Language/Haskell/LSP/Test/Exceptions.hs
index b337f0b..e1e281f 100644
--- a/src/Language/Haskell/LSP/Test/Exceptions.hs
+++ b/src/Language/Haskell/LSP/Test/Exceptions.hs
@@ -4,8 +4,13 @@ import Control.Exception
 import Language.Haskell.LSP.Messages
 import Language.Haskell.LSP.Types
 import Data.Aeson
+import Data.Aeson.Encode.Pretty
+import Data.Algorithm.Diff
+import Data.Algorithm.DiffOutput
+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
                       | UnexpectedMessage String FromServerMessage
                       | ReplayOutOfOrder FromServerMessage [FromServerMessage]
@@ -23,15 +28,21 @@ instance Show SessionException where
     "Was parsing: " ++ expected ++ "\n" ++
     "Last message received: " ++ show lastMsg
   show (ReplayOutOfOrder received expected) =
-    "Replay is out of order:\n" ++
+    let expected' = nub expected
+        getJsonDiff = lines . B.unpack . encodePretty
+        showExp exp = B.unpack (encodePretty exp) ++ "\nDiff:\n" ++
+                ppDiff (getGroupedDiff (getJsonDiff received) (getJsonDiff exp))
+    in "Replay is out of order:\n" ++
        -- Print json so its a bit easier to update the session logs
-    "Received from server:\n" ++ B.unpack (encode received) ++ "\n" ++
-    "Expected one of:\n" ++ unlines (map (B.unpack . encode) expected)
+       "Received from server:\n" ++ B.unpack (encodePretty received) ++ "\n" ++
+       "Raw from server:\n" ++ B.unpack (encode received) ++ "\n" ++
+       "Expected one of:\n" ++ unlines (map showExp expected')
   show UnexpectedDiagnostics = "Unexpectedly received diagnostics from the server."
   show (IncorrectApplyEditRequest msgStr) = "ApplyEditRequest didn't contain document, instead received:\n"
                                           ++ msgStr
   show (UnexpectedResponseError lid e) = "Received an exepected error in a response for id " ++ show lid ++ ":\n"
                                           ++ show e
 
+-- | A predicate that matches on any 'SessionException'
 anySessionException :: SessionException -> Bool
 anySessionException = const True