Fix severity prefix doubling (#689)

Language/Haskell/GhcMod/Logging.hs

@@ -76,18 +76,19 @@ gmLog level loc' doc = do
 
   let loc | loc' == "" = empty
           | otherwise = text loc' <+>: empty
-      msgDoc = gmLogLevelDoc level <+>: sep [loc, doc]
-      msg = dropWhileEnd isSpace $ gmRenderDoc msgDoc
+      msgDoc = sep [loc, doc]
+      msg = dropWhileEnd isSpace $ gmRenderDoc $ gmLogLevelDoc level <+>: msgDoc
 
   when (level <= level') $ gmErrStrLn msg
+  gmLogQuiet level loc' doc
 
-  gmlJournal (GhcModLog Nothing (Last Nothing) [(level, loc', msgDoc)])
-
--- | Appends a collection of logs to the logging environment, with effects
--- | if their log level specifies it should
-gmAppendLog ::  (MonadIO m, GmLog m, GmOut m) => GhcModLog -> m ()
-gmAppendLog  GhcModLog { gmLogMessages } = (\(level, loc, msgDoc) -> gmLog level loc msgDoc) `mapM_` gmLogMessages
+gmLogQuiet :: GmLog m => GmLogLevel -> String -> Doc -> m ()
+gmLogQuiet level loc doc =
+  gmlJournal (GhcModLog Nothing (Last Nothing) [(level, loc, doc)])
 
+gmAppendLogQuiet :: GmLog m => GhcModLog -> m ()
+gmAppendLogQuiet GhcModLog { gmLogMessages } =
+    forM_ gmLogMessages $ \(level, loc, doc) -> gmLogQuiet level loc doc
 
 gmVomit :: (MonadIO m, GmLog m, GmOut m, GmEnv m) => String -> Doc -> String -> m ()
 gmVomit filename doc content = do

Language/Haskell/GhcMod/Monad.hs

@@ -108,9 +108,9 @@ runGhcModT :: IOish m
 runGhcModT opt action = liftIO (getCurrentDirectory >>= canonicalizePath) >>= \dir' -> do
     runGmOutT opt $
       withGhcModEnv dir' opt $ \(env,lg) ->
-        first (fst <$>) <$> runGhcModT' env defaultGhcModState
-          (gmSetLogLevel (ooptLogLevel $ optOutput opt) >>
-           gmAppendLog lg >>
+        first (fst <$>) <$> runGhcModT' env defaultGhcModState (do
+          gmSetLogLevel (ooptLogLevel $ optOutput opt)
+          gmAppendLogQuiet lg
           action)
 
 -- | @hoistGhcModT result@. Embed a GhcModT computation's result into a GhcModT