adding LineSeparator.

Language/Haskell/GhcMod/Check.hs

@@ -28,7 +28,7 @@ check :: Options
       -> Cradle
       -> FilePath  -- ^ A target file
       -> Ghc [String]
-check opt cradle fileName = checkIt `gcatch` handleErrMsg
+check opt cradle fileName = checkIt `gcatch` handleErrMsg ls
   where
     checkIt = do
         readLog <- initializeFlagsWithCradle opt cradle options True
@@ -39,3 +39,4 @@ check opt cradle fileName = checkIt `gcatch` handleErrMsg
     options
       | expandSplice opt = "-w:"   : ghcOpts opt
       | otherwise        = "-Wall" : ghcOpts opt
+    ls = lineSeparator opt

Language/Haskell/GhcMod/ErrMsg.hs

@@ -15,6 +15,7 @@ import ErrUtils
 import GHC
 import HscTypes
 import Language.Haskell.GhcMod.Doc (showUnqualifiedPage)
+import Language.Haskell.GhcMod.Types (LineSeparator(..))
 import qualified Language.Haskell.GhcMod.Gap as Gap
 import Outputable
 import System.FilePath (normalise)
@@ -26,42 +27,42 @@ type LogReader = IO [String]
 
 ----------------------------------------------------------------
 
-setLogger :: Bool -> DynFlags -> IO (DynFlags, LogReader)
-setLogger False df = return (newdf, undefined)
+setLogger :: Bool -> DynFlags -> LineSeparator -> IO (DynFlags, LogReader)
+setLogger False df _ = return (newdf, undefined)
   where
     newdf = Gap.setLogAction df $ \_ _ _ _ _ -> return ()
-setLogger True  df = do
+setLogger True  df ls = do
     ref <- newIORef [] :: IO (IORef [String])
     let newdf = Gap.setLogAction df $ appendLog ref
     return (newdf, reverse <$> readIORef ref)
   where
     appendLog ref _ sev src _ msg = do
-        let !l = ppMsg src sev df msg
-        modifyIORef ref (\ls -> l : ls)
+        let !l = ppMsg src sev df ls msg
+        modifyIORef ref (l:)
 
 ----------------------------------------------------------------
 
-handleErrMsg :: SourceError -> Ghc [String]
-handleErrMsg err = do
+handleErrMsg :: LineSeparator -> SourceError -> Ghc [String]
+handleErrMsg ls err = do
     dflag <- getSessionDynFlags
-    return . errBagToStrList dflag . srcErrorMessages $ err
+    return . errBagToStrList dflag ls . srcErrorMessages $ err
 
-errBagToStrList :: DynFlags -> Bag ErrMsg -> [String]
-errBagToStrList dflag = map (ppErrMsg dflag) . reverse . bagToList
+errBagToStrList :: DynFlags -> LineSeparator -> Bag ErrMsg -> [String]
+errBagToStrList dflag ls = map (ppErrMsg dflag ls) . reverse . bagToList
 
 ----------------------------------------------------------------
 
-ppErrMsg :: DynFlags -> ErrMsg -> String
-ppErrMsg dflag err = ppMsg spn SevError dflag msg ++ ext
+ppErrMsg :: DynFlags -> LineSeparator -> ErrMsg -> String
+ppErrMsg dflag ls err = ppMsg spn SevError dflag ls msg ++ ext
    where
      spn = head (errMsgSpans err)
      msg = errMsgShortDoc err
-     ext = showMsg dflag (errMsgExtraInfo err)
+     ext = showMsg dflag ls (errMsgExtraInfo err)
 
-ppMsg :: SrcSpan -> Severity-> DynFlags -> SDoc -> String
-ppMsg spn sev dflag msg = prefix ++ cts ++ "\0"
+ppMsg :: SrcSpan -> Severity-> DynFlags -> LineSeparator -> SDoc -> String
+ppMsg spn sev dflag ls@(LineSeparator lsep) msg = prefix ++ cts ++ lsep
   where
-    cts  = showMsg dflag msg
+    cts  = showMsg dflag ls msg
     defaultPrefix
       | dopt Opt_D_dump_splices dflag = ""
       | otherwise                     = "Dummy:0:0:"
@@ -73,8 +74,15 @@ ppMsg spn sev dflag msg = prefix ++ cts ++ "\0"
 
 ----------------------------------------------------------------
 
-showMsg :: DynFlags -> SDoc -> String
-showMsg dflag sdoc = map toNull $ showUnqualifiedPage dflag sdoc
+showMsg :: DynFlags -> LineSeparator -> SDoc -> String
+showMsg dflag (LineSeparator [s]) sdoc = replaceNull $ showUnqualifiedPage dflag sdoc
   where
-    toNull '\n' = '\0'
-    toNull x = x
+    replaceNull :: String -> String
+    replaceNull []        = []
+    replaceNull ('\n':xs) = s : replaceNull xs
+    replaceNull (x:xs)    = x : replaceNull xs
+showMsg dflag (LineSeparator lsep) sdoc = replaceNull $ showUnqualifiedPage dflag sdoc
+  where
+    replaceNull []        = []
+    replaceNull ('\n':xs) = lsep ++ replaceNull xs
+    replaceNull (x:xs)    = x : replaceNull xs

Language/Haskell/GhcMod/GHCApi.hs

@@ -87,11 +87,12 @@ initSession build opt cmdOpts idirs mDepPkgs logging = do
     _ <- setSessionDynFlags dflags1
     return readLog
   where
+    ls = lineSeparator opt
     setupDynamicFlags df0 = do
         df1 <- modifyFlagsWithOpts df0 cmdOpts
         let df2 = modifyFlags df1 idirs mDepPkgs (expandSplice opt) build
         df3 <- modifyFlagsWithOpts df2 $ ghcOpts opt
-        liftIO $ setLogger logging df3
+        liftIO $ setLogger logging df3 ls
 
 ----------------------------------------------------------------
 

Language/Haskell/GhcMod/Lint.hs

@@ -12,7 +12,8 @@ lintSyntax :: Options
            -> IO String
 lintSyntax opt file = pack <$> lint opt file
   where
-    pack = unlines . map (intercalate "\0" . lines)
+    LineSeparator lsep = lineSeparator opt
+    pack = unlines . map (intercalate lsep . lines)
 
 lint :: Options
      -> FilePath    -- ^ A target file.

Language/Haskell/GhcMod/Types.hs

@@ -6,29 +6,33 @@ module Language.Haskell.GhcMod.Types where
 data OutputStyle = LispStyle  -- ^ S expression style
                  | PlainStyle -- ^ Plain textstyle
 
+newtype LineSeparator = LineSeparator String
+
 data Options = Options {
-    outputStyle  :: OutputStyle
-  , hlintOpts    :: [String]
-  , ghcOpts      :: [String]
-  , operators    :: Bool
+    outputStyle   :: OutputStyle
+  , hlintOpts     :: [String]
+  , ghcOpts       :: [String]
+  , operators     :: Bool
   -- | If 'True', 'browse' also returns types.
-  , detailed     :: Bool
+  , detailed      :: Bool
   -- | Whether or not Template Haskell should be expanded.
-  , expandSplice :: Bool
+  , expandSplice  :: Bool
   -- | The sandbox directory.
-  , sandbox      :: Maybe FilePath
+  , sandbox       :: Maybe FilePath
+  , lineSeparator :: LineSeparator
   }
 
 -- | A default 'Options'.
 defaultOptions :: Options
 defaultOptions = Options {
-    outputStyle  = PlainStyle
-  , hlintOpts    = []
-  , ghcOpts      = []
-  , operators    = False
-  , detailed     = False
-  , expandSplice = False
-  , sandbox      = Nothing
+    outputStyle   = PlainStyle
+  , hlintOpts     = []
+  , ghcOpts       = []
+  , operators     = False
+  , detailed      = False
+  , expandSplice  = False
+  , sandbox       = Nothing
+  , lineSeparator = LineSeparator "\0"
   }
 
 ----------------------------------------------------------------