[project @ 2001-08-16 11:06:10 by simonmar]

[ghc-hetmet.git] / ghc / compiler / main / DriverUtil.hs

diff --git a/ghc/compiler/main/DriverUtil.hs b/ghc/compiler/main/DriverUtil.hs
index 9c282f6..264be5c 100644 (file)
--- a/ghc/compiler/main/DriverUtil.hs
+++ b/ghc/compiler/main/DriverUtil.hs
@@ -1,5 +1,5 @@
 -----------------------------------------------------------------------------
--- $Id: DriverUtil.hs,v 1.19 2001/03/08 09:50:18 simonmar Exp $
+-- $Id: DriverUtil.hs,v 1.27 2001/08/16 11:06:10 simonmar Exp $
 --
 -- Utils for the driver
 --
@@ -14,33 +14,23 @@ module DriverUtil where
 
 import Util
 import Panic
+import Config          ( cLeadingUnderscore )
 
 import IOExts
 import Exception
 import Dynamic
 import RegexString
 
+import Directory       ( getDirectoryContents )
 import IO
-import System
 import List
 import Char
 import Monad
 
+
 -----------------------------------------------------------------------------
 -- Errors
 
-GLOBAL_VAR(v_Path_usage,  "",  String)
-
-long_usage = do
-  usage_path <- readIORef v_Path_usage
-  usage <- readFile usage_path
-  dump usage
-  exitWith ExitSuccess
-  where
-     dump "" = return ()
-     dump ('$':'$':s) = hPutStr stderr progName >> dump s
-     dump (c:s) = hPutChar stderr c >> dump s
-
 -----------------------------------------------------------------------------
 -- Reading OPTIONS pragmas
 
@@ -49,7 +39,7 @@ getOptionsFromSource
        -> IO [String]          -- options, if any
 getOptionsFromSource file
   = do h <- openFile file ReadMode
-       catchJust ioErrors (look h)
+       catchJust ioErrors (look h `finally` hClose h)
          (\e -> if isEOFError e then return [] else ioError e)
   where
        look h = do
@@ -66,6 +56,24 @@ getOptionsFromSource file
 optionRegex = mkRegex "\\{-#[ \t]+OPTIONS[ \t]+(.*)#-\\}"   -- -}
 
 -----------------------------------------------------------------------------
+-- A version of getDirectoryContents that is non-fatal if the
+-- directory doesn't exist.
+
+softGetDirectoryContents d
+   = IO.catch (getDirectoryContents d)
+         (\_ -> do hPutStrLn stderr 
+                         ("WARNING: error while reading directory " ++ d)
+                   return []
+         )
+
+-----------------------------------------------------------------------------
+-- Prefixing underscore to linker-level names
+prefixUnderscore :: String -> String
+prefixUnderscore
+ | cLeadingUnderscore == "YES" = ('_':)
+ | otherwise                   = id
+
+-----------------------------------------------------------------------------
 -- Utils
 
 unknownFlagErr :: String -> a
@@ -80,8 +88,8 @@ my_partition p (a:as)
        Just b  -> ((a,b):bs,cs)
 
 my_prefix_match :: String -> String -> Maybe String
-my_prefix_match [] rest = Just rest
-my_prefix_match (_:_) [] = Nothing
+my_prefix_match []    rest = Just rest
+my_prefix_match (_:_) []   = Nothing
 my_prefix_match (p:pat) (r:rest)
   | p == r    = my_prefix_match pat rest
   | otherwise = Nothing
@@ -92,7 +100,13 @@ handleDyn :: Typeable ex => (ex -> IO a) -> IO a -> IO a
 handleDyn = flip catchDyn
 
 handle :: (Exception -> IO a) -> IO a -> IO a
+#if __GLASGOW_HASKELL__ < 501
 handle = flip Exception.catchAllIO
+#else
+handle h f = f `Exception.catch` \e -> case e of
+    ExitException _ -> throw e
+    _               -> h e
+#endif
 
 split :: Char -> String -> [String]
 split c s = case rest of
@@ -110,11 +124,20 @@ addNoDups var x = do
   xs <- readIORef var
   unless (x `elem` xs) $ writeIORef var (x:xs)
 
-splitFilename :: String -> (String,String)
+------------------------------------------------------
+--             Filename manipulation
+------------------------------------------------------
+               
+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")
-splitFilename3 :: String -> (String,String,String)
+splitFilename3 :: String -> (String,String,Suffix)
 splitFilename3 str
    = let (dir, rest) = split_longest_prefix str '/'
         (name, ext) = splitFilename rest
@@ -122,7 +145,7 @@ splitFilename3 str
                  | otherwise = dir
      in  (real_dir, name, ext)
 
-remove_suffix :: Char -> String -> String
+remove_suffix :: Char -> String -> Suffix
 remove_suffix c s
   | null pre  = reverse suf
   | otherwise = reverse pre
@@ -146,7 +169,7 @@ split_longest_prefix s c
        (_:pre) -> (reverse pre, reverse suf)
   where (suf,pre) = break (==c) (reverse s)
 
-newsuf :: String -> String -> String
+newsuf :: String -> Suffix -> String
 newsuf suf s = remove_suffix '.' s ++ suf
 
 -- getdir strips the filename off the input string, returning the directory.
@@ -160,3 +183,4 @@ newdir dir s = dir ++ '/':drop_longest_prefix s '/'
 remove_spaces :: String -> String
 remove_spaces = reverse . dropWhile isSpace . reverse . dropWhile isSpace
 
+