-----------------------------------------------------------------------------
--- $Id: DriverUtil.hs,v 1.6 2000/11/10 14:29:21 simonmar Exp $
+-- $Id: DriverUtil.hs,v 1.27 2001/08/16 11:06:10 simonmar Exp $
--
-- Utils for the driver
--
module DriverUtil where
+#include "../includes/config.h"
#include "HsVersions.h"
-import Config
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
-short_usage = "Usage: For basic information, try the `--help' option."
-
-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 get_prog_name >> dump s
- dump (c:s) = hPutChar stderr c >> dump s
-
-data BarfKind
- = PhaseFailed String ExitCode
- | Interrupted
- | UsageError String -- prints the short usage msg after the error
- | OtherError String -- just prints the error message
- deriving Eq
-
-GLOBAL_VAR(v_Prog_name, "ghc", String)
-
-get_prog_name = unsafePerformIO (readIORef v_Prog_name) -- urk!
-
-instance Show BarfKind where
- showsPrec _ e = showString get_prog_name . showString ": " . showBarf e
-
-showBarf (UsageError str) = showString str . showChar '\n' . showString short_usage
-showBarf (OtherError str) = showString str
-showBarf (PhaseFailed phase code) =
- showString phase . showString " failed, code = " . shows code
-showBarf (Interrupted) = showString "interrupted"
-
-unknownFlagErr f = throwDyn (UsageError ("unrecognised flag: " ++ f))
-
-barfKindTc = mkTyCon "BarfKind"
-instance Typeable BarfKind where
- typeOf _ = mkAppTy barfKindTc []
-
-----------------------------------------------------------------------------
-- Reading OPTIONS pragmas
+
getOptionsFromSource
:: String -- input file
-> 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
| prefixMatch "#" l -> look h
| prefixMatch "{-# LINE" l -> look h -- -}
| Just (opts:_) <- matchRegex optionRegex l
- -> return (words opts)
+ -> do rest <- look h
+ return (words opts ++ rest)
| otherwise -> return []
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
+unknownFlagErr f = throwDyn (UsageError ("unrecognised flag: " ++ f))
+
my_partition :: (a -> Maybe b) -> [a] -> ([(a,b)],[a])
my_partition _ [] = ([],[])
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
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
[] -> [chunk]
xs <- readIORef var
unless (x `elem` xs) $ writeIORef var (x:xs)
-splitFilename :: String -> (String,String)
-splitFilename f = (reverse (stripDot rev_basename), reverse rev_ext)
- where (rev_ext, rev_basename) = span ('.' /=) (reverse f)
- stripDot ('.':xs) = xs
- stripDot xs = xs
+------------------------------------------------------
+-- Filename manipulation
+------------------------------------------------------
+
+type Suffix = String
-remove_suffix :: Char -> String -> 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,Suffix)
+splitFilename3 str
+ = let (dir, rest) = split_longest_prefix str '/'
+ (name, ext) = splitFilename rest
+ real_dir | null dir = "."
+ | otherwise = dir
+ in (real_dir, name, ext)
+
+remove_suffix :: Char -> String -> Suffix
remove_suffix c s
| null pre = reverse suf
| otherwise = reverse pre
take_longest_prefix s c = reverse pre
where (_suf,pre) = break (==c) (reverse s)
-newsuf :: String -> String -> String
+-- split a string at the last occurence of 'c', returning the two
+-- parts of the string with the 'c' removed. If the string contains
+-- no 'c's, the entire string is returned in the second component.
+split_longest_prefix :: String -> Char -> (String,String)
+split_longest_prefix s c
+ = case pre of
+ [] -> ([], reverse suf)
+ (_:pre) -> (reverse pre, reverse suf)
+ where (suf,pre) = break (==c) (reverse s)
+
+newsuf :: String -> Suffix -> String
newsuf suf s = remove_suffix '.' s ++ suf
-- getdir strips the filename off the input string, returning the directory.
remove_spaces :: String -> String
remove_spaces = reverse . dropWhile isSpace . reverse . dropWhile isSpace
+
+
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