+
+catchIO :: IO a -> (Exception.IOException -> IO a) -> IO a
+#if __GLASGOW_HASKELL__ >= 609
+catchIO = Exception.catch
+#else
+catchIO io handler = io `Exception.catch` handler'
+ where handler' (Exception.IOException ioe) = handler ioe
+ handler' e = Exception.throw e
+#endif
+
+#if mingw32_HOST_OS || mingw32_TARGET_OS
+throwIOIO :: Exception.IOException -> IO a
+#if __GLASGOW_HASKELL__ >= 609
+throwIOIO = Exception.throwIO
+#else
+throwIOIO ioe = Exception.throwIO (Exception.IOException ioe)
+#endif
+#endif
+
+catchError :: IO a -> (String -> IO a) -> IO a
+#if __GLASGOW_HASKELL__ >= 609
+catchError io handler = io `Exception.catch` handler'
+ where handler' (Exception.ErrorCall err) = handler err
+#else
+catchError io handler = io `Exception.catch` handler'
+ where handler' (Exception.ErrorCall err) = handler err
+ handler' e = Exception.throw e
+#endif
+
+onException :: IO a -> IO () -> IO a
+#if __GLASGOW_HASKELL__ >= 609
+onException = Exception.onException
+#else
+onException io what = io `Exception.catch` \e -> do what
+ Exception.throw e
+#endif
+
+
+-- copied from Cabal's Distribution.Simple.Utils, except that we want
+-- to use text files here, rather than binary files.
+writeFileAtomic :: FilePath -> String -> IO ()
+writeFileAtomic targetFile content = do
+ (tmpFile, tmpHandle) <- openTempFile targetDir template
+ do hPutStr tmpHandle content
+ hClose tmpHandle
+#if mingw32_HOST_OS || mingw32_TARGET_OS
+ renameFile tmpFile targetFile
+ -- If the targetFile exists then renameFile will fail
+ `catchIO` \err -> do
+ exists <- doesFileExist targetFile
+ if exists
+ then do removeFile targetFile
+ -- Big fat hairy race condition
+ renameFile tmpFile targetFile
+ -- If the removeFile succeeds and the renameFile fails
+ -- then we've lost the atomic property.
+ else throwIOIO err
+#else
+ renameFile tmpFile targetFile
+#endif
+ `onException` do hClose tmpHandle
+ removeFile tmpFile
+ where
+ template = targetName <.> "tmp"
+ targetDir | null targetDir_ = "."
+ | otherwise = targetDir_
+ --TODO: remove this when takeDirectory/splitFileName is fixed
+ -- to always return a valid dir
+ (targetDir_,targetName) = splitFileName targetFile
+
+-- | The function splits the given string to substrings
+-- using 'isSearchPathSeparator'.
+parseSearchPath :: String -> [FilePath]
+parseSearchPath path = split path
+ where
+ split :: String -> [String]
+ split s =
+ case rest' of
+ [] -> [chunk]
+ _:rest -> chunk : split rest
+ where
+ chunk =
+ case chunk' of
+#ifdef mingw32_HOST_OS
+ ('\"':xs@(_:_)) | last xs == '\"' -> init xs
+#endif
+ _ -> chunk'
+
+ (chunk', rest') = break isSearchPathSeparator s