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src/Development/IDE/Core/Compile.hs

@@ -272,7 +272,7 @@ parseFileContents
        -> FilePath  -- ^ the filename (for source locations)
        -> Maybe SB.StringBuffer -- ^ Haskell module source text (full Unicode is supported)
        -> ExceptT [FileDiagnostic] m ([FileDiagnostic], ParsedModule)
-parseFileContents sourcePlugin filename mbContents = do
+parseFileContents customPreprocessor filename mbContents = do
    (contents, dflags) <- preprocessor filename mbContents
    let loc  = mkRealSrcLoc (mkFastString filename) 1 1
    case unP Parser.parseModule (mkPState dflags contents loc) of
@@ -299,7 +299,7 @@ parseFileContents sourcePlugin filename mbContents = do
                  throwE $ diagFromErrMsgs "parser" dflags $ snd $ getMessages pst dflags
 
                -- Ok, we got here. It's safe to continue.
-               let (errs, parsed) = sourcePlugin rdr_module
+               let (errs, parsed) = customPreprocessor rdr_module
                unless (null errs) $ throwE $ diagFromStrings "parser" errs
                ms <- getModSummaryFromBuffer filename contents dflags parsed
                let pm =

src/Development/IDE/Core/Preprocessor.hs

@@ -31,14 +31,15 @@ import Data.Maybe
 preprocessor :: GhcMonad m => FilePath -> Maybe StringBuffer -> ExceptT [FileDiagnostic] m (StringBuffer, DynFlags)
 preprocessor filename mbContents = do
     -- Perform unlit
-    (isOnDisk, contents) <- if isLiterate filename then do
-        dflags <- getDynFlags
-        newcontent <- liftIO $ runLhs dflags filename mbContents
-        return (False, newcontent)
-    else do
-        contents <- liftIO $ maybe (hGetStringBuffer filename) return mbContents
-        let isOnDisk = isNothing mbContents
-        return (isOnDisk, contents)
+    (isOnDisk, contents) <-
+        if isLiterate filename then do
+            dflags <- getDynFlags
+            newcontent <- liftIO $ runLhs dflags filename mbContents
+            return (False, newcontent)
+        else do
+            contents <- liftIO $ maybe (hGetStringBuffer filename) return mbContents
+            let isOnDisk = isNothing mbContents
+            return (isOnDisk, contents)
 
     -- Perform cpp
     dflags  <- ExceptT $ parsePragmasIntoDynFlags filename contents