Move transfer into the GF repo.

1 files changed, 110 insertions, 0 deletions

diff --git a/src/Transfer/PathUtil.hs b/src/Transfer/PathUtil.hs
new file mode 100644
index 000000000..b344563c6
--- /dev/null
+++ b/src/Transfer/PathUtil.hs
@@ -0,0 +1,110 @@
+{-# OPTIONS_GHC -cpp #-}
+
+-----------------------------------------------------------------------------
+-- File name and directory utilities. Stolen from 
+-- ghc-6.4.1/ghc/compiler/main/DriverUtil.hs
+--
+-- (c) The University of Glasgow 2000
+--
+-----------------------------------------------------------------------------
+
+module Transfer.PathUtil (
+	Suffix, splitFilename, getFileSuffix,
+	splitFilename3, remove_suffix, split_longest_prefix,
+	replaceFilenameSuffix, directoryOf, filenameOf,
+	replaceFilenameDirectory, replaceFilename, remove_spaces, escapeSpaces,
+  ) where
+
+import Data.Char (isSpace)
+	
+type Suffix = String
+
+splitFilename :: String -> (String,Suffix)
+splitFilename f = split_longest_prefix f (=='.')
+
+getFileSuffix :: String -> Suffix
+getFileSuffix f = drop_longest_prefix f (=='.')
+
+-- "foo/bar/xyzzy.ext" -> ("foo/bar", "xyzzy.ext")
+splitFilenameDir :: String -> (String,String)
+splitFilenameDir str
+  = let (dir, rest) = split_longest_prefix str isPathSeparator
+  	real_dir | null dir  = "."
+		 | otherwise = dir
+    in  (real_dir, rest)
+
+-- "foo/bar/xyzzy.ext" -> ("foo/bar", "xyzzy", ".ext")
+splitFilename3 :: String -> (String,String,Suffix)
+splitFilename3 str
+   = let (dir, rest) = split_longest_prefix str isPathSeparator
+	 (name, ext) = splitFilename rest
+	 real_dir | null dir  = "."
+		  | otherwise = dir
+     in  (real_dir, name, ext)
+
+remove_suffix :: Char -> String -> Suffix
+remove_suffix c s
+  | null pre  = s
+  | otherwise = reverse pre
+  where (suf,pre) = break (==c) (reverse s)
+
+drop_longest_prefix :: String -> (Char -> Bool) -> String
+drop_longest_prefix s pred = reverse suf
+  where (suf,_pre) = break pred (reverse s)
+
+take_longest_prefix :: String -> (Char -> Bool) -> String
+take_longest_prefix s pred = reverse pre
+  where (_suf,pre) = break pred (reverse s)
+
+-- split a string at the last character where 'pred' is True,
+-- returning a pair of strings. The first component holds the string
+-- up (but not including) the last character for which 'pred' returned
+-- True, the second whatever comes after (but also not including the
+-- last character).
+--
+-- If 'pred' returns False for all characters in the string, the original
+-- string is returned in the second component (and the first one is just
+-- empty).
+split_longest_prefix :: String -> (Char -> Bool) -> (String,String)
+split_longest_prefix s pred
+  = case pre of
+	[]      -> ([], reverse suf)
+	(_:pre) -> (reverse pre, reverse suf)
+  where (suf,pre) = break pred (reverse s)
+
+replaceFilenameSuffix :: FilePath -> Suffix -> FilePath
+replaceFilenameSuffix s suf = remove_suffix '.' s ++ suf
+
+-- directoryOf strips the filename off the input string, returning
+-- the directory.
+directoryOf :: FilePath -> String
+directoryOf = fst . splitFilenameDir
+
+-- filenameOf strips the directory off the input string, returning
+-- the filename.
+filenameOf :: FilePath -> String
+filenameOf = snd . splitFilenameDir
+
+replaceFilenameDirectory :: FilePath -> String -> FilePath
+replaceFilenameDirectory s dir
+ = dir ++ '/':drop_longest_prefix s isPathSeparator
+
+replaceFilename :: FilePath -> String -> FilePath
+replaceFilename f n
+ = case directoryOf f of
+                      "" -> n
+                      d  -> d ++ '/' : n
+
+remove_spaces :: String -> String
+remove_spaces = reverse . dropWhile isSpace . reverse . dropWhile isSpace
+
+escapeSpaces :: String -> String
+escapeSpaces = foldr (\c s -> if isSpace c then '\\':c:s else c:s) ""
+
+isPathSeparator :: Char -> Bool
+isPathSeparator ch =
+#ifdef mingw32_TARGET_OS
+  ch == '/' || ch == '\\'
+#else
+  ch == '/'
+#endif