cleanup

Simplify the implementation of writeUTF8File and use it in one more place.
Remove unused imports left over after a previous change.

src/compiler/GF/Infra/UseIO.hs

@@ -188,16 +188,14 @@ putPointE v opts msg act = do
 -- * File IO
 
 writeUTF8File :: FilePath -> String -> IO ()
-writeUTF8File fpath content = do
-  h <- openFile fpath WriteMode
-  hSetEncoding h utf8
-  hPutStr h content
-  hClose h
+writeUTF8File fpath content =
+  withFile fpath WriteMode $ \ h -> do hSetEncoding h utf8
+                                       hPutStr h content
 
 readBinaryFile path = hGetContents =<< openBinaryFile path ReadMode
 writeBinaryFile path s = withBinaryFile path WriteMode (flip hPutStr s)
 
--- Because GHC adds the confusing text "user error" for failures cased by
+-- | Because GHC adds the confusing text "user error" for failures caused by
 -- calls to fail.
 ioErrorText e = if isUserError e
                 then ioeGetErrorString e

src/compiler/GFC.hs

@@ -117,11 +117,7 @@ grammarName opts pgf = fromMaybe (showCId (absname pgf)) (flag optName opts)
 
 writeOutput :: Options -> FilePath-> String -> IOE ()
 writeOutput opts file str =
-    do let path = case flag optOutputDir opts of
-                    Nothing  -> file
-                    Just dir -> dir </> file
-       putPointE Normal opts ("Writing " ++ path ++ "...") $ ioeIO $
-         bracket
-           (openFile path WriteMode)
-           (hClose)
-           (\h -> hSetEncoding h utf8 >> hPutStr h str)
+    putPointE Normal opts ("Writing " ++ path ++ "...") $ ioeIO $
+      writeUTF8File path str
+  where
+    path = maybe id (</>) (flag optOutputDir opts) file

src/compiler/GFI.hs

@@ -40,7 +40,7 @@ import Data.List(nub,isPrefixOf,isInfixOf,partition)
 import qualified Data.Map as Map
 import qualified Data.ByteString.Char8 as BS
 import qualified Text.ParserCombinators.ReadP as RP
-import System.IO(utf8,mkTextEncoding,hSetEncoding,stdin,stdout,stderr)
+import System.IO(utf8)
 --import System.CPUTime(getCPUTime)
 import System.Directory({-getCurrentDirectory,-}getAppUserDataDirectory)
 import Control.Exception(SomeException,fromException,evaluate,try)