From ce1d9d1da1e306f2aed34f3e4d5d02daab8c2d32 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Gr=C3=B6ber?= <dxld@darkboxed.org>
Date: Fri, 11 Sep 2015 04:13:44 +0200
Subject: [PATCH] Fix ghc<7.10

---
 Language/Haskell/GhcMod/DebugLogger.hs | 52 ++++++++++++++++++++------
 Language/Haskell/GhcMod/Gap.hs         | 11 ++++--
 2 files changed, 49 insertions(+), 14 deletions(-)

diff --git a/Language/Haskell/GhcMod/DebugLogger.hs b/Language/Haskell/GhcMod/DebugLogger.hs
index 3e3069a..83c11c9 100644
--- a/Language/Haskell/GhcMod/DebugLogger.hs
+++ b/Language/Haskell/GhcMod/DebugLogger.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 module Language.Haskell.GhcMod.DebugLogger where
 
 
@@ -7,28 +8,46 @@ import Pretty
 import Outputable (SDoc, PprStyle, runSDoc, initSDocContext, blankLine)
 import qualified Outputable
 import ErrUtils
-import DynFlags (LogAction)
 
 import Language.Haskell.GhcMod.Error
+import Language.Haskell.GhcMod.Gap
 import Prelude
 
-debugLogAction :: (String -> IO ()) -> LogAction
+debugLogAction :: (String -> IO ()) -> GmLogAction
 debugLogAction putErr dflags severity srcSpan style msg
     = case severity of
-      SevOutput      -> printSDoc msg style
-      SevDump        -> printSDoc (msg Outputable.$$ blankLine) style
-      SevInteractive -> putStrSDoc msg style
-      SevInfo        -> printErrs msg style
-      SevFatal       -> printErrs msg style
+      SevOutput      -> printSDoc putErr msg style
+
+#if __GLASGOW_HASKELL__ >= 706
+      SevDump        -> printSDoc putErr (msg Outputable.$$ blankLine) style
+#endif
+
+#if __GLASGOW_HASKELL__ >= 708
+      SevInteractive -> let
+          putStrSDoc = debugLogActionHPutStrDoc dflags putErr
+       in
+          putStrSDoc msg style
+#endif
+      SevInfo        -> printErrs putErr msg style
+      SevFatal       -> printErrs putErr msg style
       _              -> do putErr "\n"
-                           printErrs (mkLocMessage severity srcSpan msg) style
+#if __GLASGOW_HASKELL__ >= 706
+                           printErrs putErr (mkLocMessage severity srcSpan msg) style
+#else
+                           printErrs putErr (mkLocMessage srcSpan msg) style
+#endif
                            -- careful (#2302): printErrs prints in UTF-8,
                            -- whereas converting to string first and using
                            -- hPutStr would just emit the low 8 bits of
                            -- each unicode char.
-    where printSDoc  = debugLogActionHPrintDoc  dflags putErr
-          printErrs  = debugLogActionHPrintDoc  dflags putErr
-          putStrSDoc = debugLogActionHPutStrDoc dflags putErr
+    where
+#if __GLASGOW_HASKELL__ >= 706
+      printSDoc put = debugLogActionHPrintDoc  dflags put
+      printErrs put = debugLogActionHPrintDoc  dflags put
+#endif
+
+
+#if __GLASGOW_HASKELL__ >= 706
 
 debugLogActionHPrintDoc :: DynFlags -> (String -> IO ()) -> SDoc -> PprStyle -> IO ()
 debugLogActionHPrintDoc dflags put d sty
@@ -42,6 +61,15 @@ debugLogActionHPutStrDoc dflags put d sty
           -- calls to this log-action can output all on the same line
     doc = runSDoc d (initSDocContext dflags sty)
 
+#else
+
+printSDoc = printErrs
+
+printErrs :: (String -> IO ()) -> SDoc -> PprStyle -> IO ()
+printErrs put doc sty = do
+  gmPrintDoc PageMode 100 put (runSDoc doc (initSDocContext sty))
+
+#endif
 
 gmPrintDoc :: Mode -> Int -> (String -> IO ()) -> Doc -> IO ()
 -- printDoc adds a newline to the end
@@ -54,7 +82,9 @@ gmPrintDoc_ mode pprCols putS doc
     put (Chr c)  next = putS [c] >> next
     put (Str s)  next = putS s >> next
     put (PStr s) next = putS (unpackFS s) >> next
+#if __GLASGOW_HASKELL__ >= 708
     put (ZStr s) next = putS (zString s) >> next
+#endif
     put (LStr s _l) next = putS (unpackLitString s) >> next
 
     done = return () -- hPutChar hdl '\n'
diff --git a/Language/Haskell/GhcMod/Gap.hs b/Language/Haskell/GhcMod/Gap.hs
index da96c82..00d8bc5 100644
--- a/Language/Haskell/GhcMod/Gap.hs
+++ b/Language/Haskell/GhcMod/Gap.hs
@@ -4,6 +4,7 @@ module Language.Haskell.GhcMod.Gap (
     Language.Haskell.GhcMod.Gap.ClsInst
   , mkTarget
   , withStyle
+  , GmLogAction
   , setLogAction
   , getSrcSpan
   , getSrcFile
@@ -135,9 +136,13 @@ withStyle = withPprStyleDoc
 withStyle _ = withPprStyleDoc
 #endif
 
-setLogAction :: DynFlags
-             -> (DynFlags -> Severity -> SrcSpan -> PprStyle -> SDoc -> IO ())
-             -> DynFlags
+#if __GLASGOW_HASKELL__ >= 706
+type GmLogAction = LogAction
+#else
+type GmLogAction = DynFlags -> LogAction
+#endif
+
+setLogAction :: DynFlags -> GmLogAction -> DynFlags
 setLogAction df f =
 #if __GLASGOW_HASKELL__ >= 706
     df { log_action = f }