1 -----------------------------------------------------------------------------
2 -- $Id: DriverUtil.hs,v 1.3 2000/10/11 15:26:18 simonmar Exp $
4 -- Utils for the driver
6 -- (c) The University of Glasgow 2000
8 -----------------------------------------------------------------------------
10 module DriverUtil where
12 #include "HsVersions.h"
28 -----------------------------------------------------------------------------
31 short_usage = "Usage: For basic information, try the `--help' option."
33 GLOBAL_VAR(path_usage, "", String)
36 usage_path <- readIORef path_usage
37 usage <- readFile usage_path
42 dump ('$':'$':s) = hPutStr stderr get_prog_name >> dump s
43 dump (c:s) = hPutChar stderr c >> dump s
45 version_str = cProjectVersion
48 = PhaseFailed String ExitCode
50 | UsageError String -- prints the short usage msg after the error
51 | OtherError String -- just prints the error message
54 GLOBAL_VAR(prog_name, "ghc", String)
56 get_prog_name = unsafePerformIO (readIORef prog_name) -- urk!
58 instance Show BarfKind where
59 showsPrec _ e = showString get_prog_name . showString ": " . showBarf e
61 showBarf (UsageError str) = showString str . showChar '\n' . showString short_usage
62 showBarf (OtherError str) = showString str
63 showBarf (PhaseFailed phase code) =
64 showString phase . showString " failed, code = " . shows code
65 showBarf (Interrupted) = showString "interrupted"
67 unknownFlagErr f = throwDyn (UsageError ("unrecognised flag: " ++ f))
69 barfKindTc = mkTyCon "BarfKind"
70 instance Typeable BarfKind where
71 typeOf _ = mkAppTy barfKindTc []
73 -----------------------------------------------------------------------------
74 -- Reading OPTIONS pragmas
77 :: String -- input file
78 -> IO [String] -- options, if any
79 getOptionsFromSource file
80 = do h <- openFile file ReadMode
81 catchJust ioErrors (look h)
82 (\e -> if isEOFError e then return [] else ioError e)
88 | prefixMatch "#" l -> look h
89 | prefixMatch "{-# LINE" l -> look h -- -}
90 | Just (opts:_) <- matchRegex optionRegex l
91 -> return (words opts)
92 | otherwise -> return []
94 optionRegex = mkRegex "\\{-#[ \t]+OPTIONS[ \t]+(.*)#-\\}" -- -}
96 -----------------------------------------------------------------------------
99 my_partition :: (a -> Maybe b) -> [a] -> ([(a,b)],[a])
100 my_partition _ [] = ([],[])
101 my_partition p (a:as)
102 = let (bs,cs) = my_partition p as in
105 Just b -> ((a,b):bs,cs)
107 my_prefix_match :: String -> String -> Maybe String
108 my_prefix_match [] rest = Just rest
109 my_prefix_match (_:_) [] = Nothing
110 my_prefix_match (p:pat) (r:rest)
111 | p == r = my_prefix_match pat rest
112 | otherwise = Nothing
116 handleDyn :: Typeable ex => (ex -> IO a) -> IO a -> IO a
117 handleDyn = flip catchDyn
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 = (reverse (stripDot rev_basename), reverse rev_ext)
137 where (rev_ext, rev_basename) = span ('.' /=) (reverse f)
138 stripDot ('.':xs) = xs
141 remove_suffix :: Char -> String -> String
143 | null pre = reverse suf
144 | otherwise = reverse pre
145 where (suf,pre) = break (==c) (reverse s)
147 drop_longest_prefix :: String -> Char -> String
148 drop_longest_prefix s c = reverse suf
149 where (suf,_pre) = break (==c) (reverse s)
151 take_longest_prefix :: String -> Char -> String
152 take_longest_prefix s c = reverse pre
153 where (_suf,pre) = break (==c) (reverse s)
155 newsuf :: String -> String -> String
156 newsuf suf s = remove_suffix '.' s ++ suf
158 -- getdir strips the filename off the input string, returning the directory.
159 getdir :: String -> String
160 getdir s = if null dir then "." else init dir
161 where dir = take_longest_prefix s '/'
163 newdir :: String -> String -> String
164 newdir dir s = dir ++ '/':drop_longest_prefix s '/'
166 remove_spaces :: String -> String
167 remove_spaces = reverse . dropWhile isSpace . reverse . dropWhile isSpace
171 \ __GLASGOW_HASKELL__" of