+
+-- 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