[project @ 2005-11-04 15:48:25 by simonmar]

[ghc-hetmet.git] / ghc / compiler / utils / Util.lhs

diff --git a/ghc/compiler/utils/Util.lhs b/ghc/compiler/utils/Util.lhs
index 0911dba..1598c12 100644 (file)
--- a/ghc/compiler/utils/Util.lhs
+++ b/ghc/compiler/utils/Util.lhs
@@ -70,6 +70,7 @@ module Util (
        replaceFilenameSuffix, directoryOf, filenameOf,
        replaceFilenameDirectory,
        escapeSpaces, isPathSeparator,
+       parseSearchPath,
        normalisePath, platformPath, pgmPath,
     ) where
 
@@ -950,6 +951,40 @@ isPathSeparator ch =
   ch == '/'
 #endif
 
+--------------------------------------------------------------
+-- * Search path
+--------------------------------------------------------------
+
+-- | The function splits the given string to substrings
+-- using the 'searchPathSeparator'.
+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 (==searchPathSeparator) s
+
+-- | A platform-specific character used to separate search path strings in 
+-- environment variables. The separator is a colon (\":\") on Unix and Macintosh, 
+-- and a semicolon (\";\") on the Windows operating system.
+searchPathSeparator :: Char
+#if mingw32_HOST_OS || mingw32_TARGET_OS
+searchPathSeparator = ';'
+#else
+searchPathSeparator = ':'
+#endif
+
 -----------------------------------------------------------------------------
 -- Convert filepath into platform / MSDOS form.