1 -----------------------------------------------------------------------------
2 -- $Id: DriverUtil.hs,v 1.39 2003/08/20 15:07:57 simonmar Exp $
4 -- Utils for the driver
6 -- (c) The University of Glasgow 2000
8 -----------------------------------------------------------------------------
10 module DriverUtil where
12 #include "../includes/config.h"
13 #include "HsVersions.h"
17 import Config ( cLeadingUnderscore )
19 import EXCEPTION ( Exception(..), finally, throwDyn, catchDyn, throw )
20 import qualified EXCEPTION as Exception
22 import DATA_IOREF ( IORef, readIORef, writeIORef )
30 -----------------------------------------------------------------------------
31 -- Reading OPTIONS pragmas
34 :: String -- input file
35 -> IO [String] -- options, if any
36 getOptionsFromSource file
37 = do h <- openFile file ReadMode
38 catchJust ioErrors (look h `finally` hClose h)
39 (\e -> if isEOFError e then return [] else ioError e)
43 let l = remove_spaces l'
46 | prefixMatch "#" l -> look h
47 | prefixMatch "{-# LINE" l -> look h -- -}
48 | Just opts <- matchOptions l
50 return (words opts ++ rest)
51 | otherwise -> return []
54 | Just s1 <- maybePrefixMatch "{-#" s, -- -}
55 Just s2 <- maybePrefixMatch "OPTIONS" (remove_spaces s1),
56 Just s3 <- maybePrefixMatch "}-#" (reverse s2)
61 -----------------------------------------------------------------------------
62 -- A version of getDirectoryContents that is non-fatal if the
63 -- directory doesn't exist.
65 softGetDirectoryContents d
66 = IO.catch (getDirectoryContents d)
67 (\_ -> do hPutStrLn stderr
68 ("WARNING: error while reading directory " ++ d)
72 -----------------------------------------------------------------------------
73 -- Create a hierarchy of directories
75 createDirectoryHierarchy :: FilePath -> IO ()
76 createDirectoryHierarchy dir = do
77 b <- doesDirectoryExist dir
79 createDirectoryHierarchy (directoryOf dir)
82 -----------------------------------------------------------------------------
83 -- Verify that the 'dirname' portion of a FilePath exists.
85 doesDirNameExist :: FilePath -> IO Bool
86 doesDirNameExist fpath = doesDirectoryExist (directoryOf fpath)
88 -----------------------------------------------------------------------------
89 -- Prefixing underscore to linker-level names
90 prefixUnderscore :: String -> String
92 | cLeadingUnderscore == "YES" = ('_':)
95 -----------------------------------------------------------------------------
98 unknownFlagErr :: String -> a
99 unknownFlagErr f = throwDyn (UsageError ("unrecognised flag: " ++ f))
101 unknownFlagsErr :: [String] -> a
102 unknownFlagsErr fs = throwDyn (UsageError ("unrecognised flags: " ++ unwords fs))
104 my_partition :: (a -> Maybe b) -> [a] -> ([(a,b)],[a])
105 my_partition _ [] = ([],[])
106 my_partition p (a:as)
107 = let (bs,cs) = my_partition p as in
110 Just b -> ((a,b):bs,cs)
114 handleDyn :: Typeable ex => (ex -> IO a) -> IO a -> IO a
115 handleDyn = flip catchDyn
117 handle :: (Exception -> IO a) -> IO a -> IO a
118 #if __GLASGOW_HASKELL__ < 501
119 handle = flip Exception.catchAllIO
121 handle h f = f `Exception.catch` \e -> case e of
122 ExitException _ -> throw e
126 split :: Char -> String -> [String]
127 split c s = case rest of
129 _:rest -> chunk : split c rest
130 where (chunk, rest) = break (==c) s
132 add :: IORef [a] -> a -> IO ()
135 writeIORef var (x:xs)
137 addNoDups :: Eq a => IORef [a] -> a -> IO ()
140 unless (x `elem` xs) $ writeIORef var (x:xs)
142 ------------------------------------------------------
143 -- Filename manipulation
144 ------------------------------------------------------
148 splitFilename :: String -> (String,Suffix)
149 splitFilename f = split_longest_prefix f (=='.')
151 getFileSuffix :: String -> Suffix
152 getFileSuffix f = drop_longest_prefix f (=='.')
154 -- "foo/bar/xyzzy.ext" -> ("foo/bar", "xyzzy.ext")
155 splitFilenameDir :: String -> (String,String)
157 = let (dir, rest) = split_longest_prefix str isPathSeparator
158 real_dir | null dir = "."
162 -- "foo/bar/xyzzy.ext" -> ("foo/bar", "xyzzy", ".ext")
163 splitFilename3 :: String -> (String,String,Suffix)
165 = let (dir, rest) = split_longest_prefix str isPathSeparator
166 (name, ext) = splitFilename rest
167 real_dir | null dir = "."
169 in (real_dir, name, ext)
171 remove_suffix :: Char -> String -> Suffix
173 | null pre = reverse suf
174 | otherwise = reverse pre
175 where (suf,pre) = break (==c) (reverse s)
177 drop_longest_prefix :: String -> (Char -> Bool) -> String
178 drop_longest_prefix s pred = reverse suf
179 where (suf,_pre) = break pred (reverse s)
181 take_longest_prefix :: String -> (Char -> Bool) -> String
182 take_longest_prefix s pred = reverse pre
183 where (_suf,pre) = break pred (reverse s)
185 -- split a string at the last character where 'pred' is True,
186 -- returning a pair of strings. The first component holds the string
187 -- up (but not including) the last character for which 'pred' returned
188 -- True, the second whatever comes after (but also not including the
191 -- If 'pred' returns False for all characters in the string, the original
192 -- string is returned in the second component (and the first one is just
194 split_longest_prefix :: String -> (Char -> Bool) -> (String,String)
195 split_longest_prefix s pred
197 [] -> ([], reverse suf)
198 (_:pre) -> (reverse pre, reverse suf)
199 where (suf,pre) = break pred (reverse s)
201 replaceFilenameSuffix :: FilePath -> Suffix -> FilePath
202 replaceFilenameSuffix s suf = remove_suffix '.' s ++ suf
204 -- directoryOf strips the filename off the input string, returning
206 directoryOf :: FilePath -> String
207 directoryOf = fst . splitFilenameDir
209 replaceFilenameDirectory :: FilePath -> String -> FilePath
210 replaceFilenameDirectory s dir
211 = dir ++ '/':drop_longest_prefix s isPathSeparator
213 remove_spaces :: String -> String
214 remove_spaces = reverse . dropWhile isSpace . reverse . dropWhile isSpace
216 escapeSpaces :: String -> String
217 escapeSpaces = foldr (\c s -> if isSpace c then '\\':c:s else c:s) ""
219 isPathSeparator :: Char -> Bool
221 #ifdef mingw32_TARGET_OS
222 ch == '/' || ch == '\\'