Move reading source from stdin to frontend

Language/Haskell/GhcMod/FileMapping.hs

@@ -21,22 +21,10 @@ import GHC
 loadMappedFiles :: IOish m => GhcModT m ()
 loadMappedFiles = do
   Options {fileMappings} <- options
-  mapM_ (uncurry loadMappedFile) $ reverse fileMappings
+  mapM_ (uncurry loadMappedFile) fileMappings
 
 loadMappedFile :: IOish m => FilePath -> FileMapping -> GhcModT m ()
-loadMappedFile from fm@(RedirectedMapping _) =
-  addToState from fm
-loadMappedFile from (MemoryMapping _) = do
-  let loop' acc = do
-        line <- getLine
-        if not (null line) && last line == '\EOT'
-        then return $ acc ++ init line
-        else loop' (acc++line++"\n")
-  src <- liftIO $ loop' ""
-  addToState from (MemoryMapping $ Just src)
-
-addToState :: IOish m => FilePath -> FileMapping -> GhcModT m ()
-addToState from fm = do
+loadMappedFile from fm = do
   crdl <- cradle
   let ccfn = cradleCurrentDir crdl </> from
   cfn <- liftIO $ canonicalizePath ccfn

src/GHCMod.hs

@@ -438,11 +438,12 @@ legacyInteractiveLoop symdbreq world = do
         "boot"   -> bootCmd []
         "browse" -> browseCmd args
 
-        "map-file"   -> loadMappedFile arg (MemoryMapping Nothing)
-                     >> return ""
+        "map-file"   ->  liftIO getFileSourceFromStdin
+                     >>= loadMappedFile arg . MemoryMapping . Just
+                     >>  return ""
 
-        "unmap-file" -> unloadMappedFile arg
-                     >> return ""
+        "unmap-file" ->  unloadMappedFile arg
+                     >>  return ""
 
         "quit"   -> liftIO $ exitSuccess
         ""       -> liftIO $ exitSuccess
@@ -456,6 +457,15 @@ legacyInteractiveLoop symdbreq world = do
           , GHandler $ \(SomeException e) -> gmErrStrLn (show e) >> return ""
           ]
 
+getFileSourceFromStdin :: IO String
+getFileSourceFromStdin = do
+  let loop' acc = do
+        line <- getLine
+        if not (null line) && last line == '\EOT'
+        then return $ acc ++ init line
+        else loop' (acc++line++"\n")
+  loop' ""
+
 ghcCommands :: IOish m => [String] -> GhcModT m ()
 ghcCommands []         = fatalError "No command given (try --help)"
 ghcCommands (cmd:args) = do