1 -----------------------------------------------------------------------------
2 -- $Id: DriverUtil.hs,v 1.23 2001/06/02 09:45:51 qrczak 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"
23 import Directory ( getDirectoryContents )
30 #ifndef mingw32_TARGET_OS
34 -----------------------------------------------------------------------------
37 GLOBAL_VAR(v_Path_usage, "", String)
40 usage_path <- readIORef v_Path_usage
41 usage <- readFile usage_path
46 dump ('$':'$':s) = hPutStr stderr progName >> dump s
47 dump (c:s) = hPutChar stderr c >> dump s
49 -----------------------------------------------------------------------------
50 -- Reading OPTIONS pragmas
53 :: String -- input file
54 -> IO [String] -- options, if any
55 getOptionsFromSource file
56 = do h <- openFile file ReadMode
57 catchJust ioErrors (look h)
58 (\e -> if isEOFError e then return [] else ioError e)
64 | prefixMatch "#" l -> look h
65 | prefixMatch "{-# LINE" l -> look h -- -}
66 | Just (opts:_) <- matchRegex optionRegex l
68 return (words opts ++ rest)
69 | otherwise -> return []
71 optionRegex = mkRegex "\\{-#[ \t]+OPTIONS[ \t]+(.*)#-\\}" -- -}
73 -----------------------------------------------------------------------------
74 -- A version of getDirectoryContents that is non-fatal if the
75 -- directory doesn't exist.
77 softGetDirectoryContents d
78 = IO.catch (getDirectoryContents d)
79 (\_ -> do hPutStr stderr
80 ("WARNING: error while reading directory " ++ d)
84 -----------------------------------------------------------------------------
87 unknownFlagErr :: String -> a
88 unknownFlagErr f = throwDyn (UsageError ("unrecognised flag: " ++ f))
90 my_partition :: (a -> Maybe b) -> [a] -> ([(a,b)],[a])
91 my_partition _ [] = ([],[])
93 = let (bs,cs) = my_partition p as in
96 Just b -> ((a,b):bs,cs)
98 my_prefix_match :: String -> String -> Maybe String
99 my_prefix_match [] rest = Just rest
100 my_prefix_match (_:_) [] = Nothing
101 my_prefix_match (p:pat) (r:rest)
102 | p == r = my_prefix_match pat rest
103 | otherwise = Nothing
107 handleDyn :: Typeable ex => (ex -> IO a) -> IO a -> IO a
108 handleDyn = flip catchDyn
110 handle :: (Exception -> IO a) -> IO a -> IO a
111 #if __GLASGOW_HASKELL__ < 501
112 handle = flip Exception.catchAllIO
114 handle h f = f `Exception.catch` \e -> case e of
115 ExitException _ -> throw e
119 split :: Char -> String -> [String]
120 split c s = case rest of
122 _:rest -> chunk : split c rest
123 where (chunk, rest) = break (==c) s
125 add :: IORef [a] -> a -> IO ()
128 writeIORef var (x:xs)
130 addNoDups :: Eq a => IORef [a] -> a -> IO ()
133 unless (x `elem` xs) $ writeIORef var (x:xs)
135 splitFilename :: String -> (String,String)
136 splitFilename f = split_longest_prefix f '.'
138 getFileSuffix :: String -> String
139 getFileSuffix f = drop_longest_prefix f '.'
141 -- "foo/bar/xyzzy.ext" -> ("foo/bar", "xyzzy", ".ext")
142 splitFilename3 :: String -> (String,String,String)
144 = let (dir, rest) = split_longest_prefix str '/'
145 (name, ext) = splitFilename rest
146 real_dir | null dir = "."
148 in (real_dir, name, ext)
150 remove_suffix :: Char -> String -> String
152 | null pre = reverse suf
153 | otherwise = reverse pre
154 where (suf,pre) = break (==c) (reverse s)
156 drop_longest_prefix :: String -> Char -> String
157 drop_longest_prefix s c = reverse suf
158 where (suf,_pre) = break (==c) (reverse s)
160 take_longest_prefix :: String -> Char -> String
161 take_longest_prefix s c = reverse pre
162 where (_suf,pre) = break (==c) (reverse s)
164 -- split a string at the last occurence of 'c', returning the two
165 -- parts of the string with the 'c' removed. If the string contains
166 -- no 'c's, the entire string is returned in the second component.
167 split_longest_prefix :: String -> Char -> (String,String)
168 split_longest_prefix s c
170 [] -> ([], reverse suf)
171 (_:pre) -> (reverse pre, reverse suf)
172 where (suf,pre) = break (==c) (reverse s)
174 newsuf :: String -> String -> String
175 newsuf suf s = remove_suffix '.' s ++ suf
177 -- getdir strips the filename off the input string, returning the directory.
178 getdir :: String -> String
179 getdir s = if null dir then "." else init dir
180 where dir = take_longest_prefix s '/'
182 newdir :: String -> String -> String
183 newdir dir s = dir ++ '/':drop_longest_prefix s '/'
185 remove_spaces :: String -> String
186 remove_spaces = reverse . dropWhile isSpace . reverse . dropWhile isSpace
190 prependToolDir :: String -> IO String
191 #if defined(mingw32_TARGET_OS) && defined(MINIMAL_UNIX_DEPS)
192 ghcToolDir = unsafePerformIO $ do
193 bs <- getEnv "GHC_TOOLDIR" `IO.catch` (\ _ -> return "")
200 | term `elem` ['/', '\\'] = bs
201 | otherwise = bs ++ ['/']
205 prependToolDir x = return (dosifyPath (ghcToolDir ++ x))
208 prependToolDir x = return x
211 appendInstallDir :: String -> IO String
212 appendInstallDir cmd =
215 _ -> return (unwords [cmd, '-':'B':ghcToolDir])
217 -- convert filepath into MSDOS form.
218 dosifyPath :: String -> String
219 #if defined(mingw32_TARGET_OS) && defined(MINIMAL_UNIX_DEPS)
220 dosifyPath stuff = subst '/' '\\' real_stuff
222 -- fully convince myself that /cygdrive/ prefixes cannot
223 -- really appear here.
224 cygdrive_prefix = "/cygdrive/"
227 | "/cygdrive/" `isPrefixOf` stuff = drop (length cygdrive_prefix) stuff
230 subst a b ls = map (\ x -> if x == a then b else x) ls
235 #ifdef mingw32_TARGET_OS
236 foreign import "_getpid" myGetProcessID :: IO Int
238 myGetProcessID :: IO Int
239 myGetProcessID = Posix.getProcessID