[Haskell-cafe] How to get program command line arguments in
Unicode-aware way (Unix/Linux)?
bulat.ziganshin at gmail.com
Thu Mar 12 05:57:47 EDT 2009
Thursday, March 12, 2009, 5:42:14 AM, you wrote:
depends on your OS. for windows i use this code:
myGetArgs = do
alloca $ \p_argc -> do
p_argv_w <- commandLineToArgvW getCommandLineW p_argc
argc <- peek p_argc
argv_w <- peekArray (i argc) p_argv_w
mapM peekTString argv_w >>== tail
foreign import stdcall unsafe "windows.h GetCommandLineW"
getCommandLineW :: LPTSTR
foreign import stdcall unsafe "windows.h CommandLineToArgvW"
commandLineToArgvW :: LPCWSTR -> Ptr CInt -> IO (Ptr LPWSTR)
note that it doesn't skip over +RTS sections. btw, i plan to make
unicode-aware version of System.Directory module to solve all these problems
> I am trying to process command line arguments that may contain Unicode
> (cyrillic in this example) characters.
> The standard GHC's getArgs seems to pass whatever was obtained from
> the underlying C library
> without any regard to encoding, e. g the following program (testarg.hs):
> module Main where
> import System.Environment
> main = do
> x <- getArgs
> mapM (putStrLn . show) x
> being invoked (ghc 6.10.1)
> runghc testarg -T 'при<в>ет'
> prints the following:
> (not correct, all bytes were passed without proper encoding)
> Is there any way to get program arguments in GHC Unicode-aware? Or at
> least assuming that they are always in UTF-8?
> Something like System.IO.UTF8, but for command line arguments?
> PS: BTW runhugs testarg -T 'при<в>ет' prints:
> which is correct.
Bulat mailto:Bulat.Ziganshin at gmail.com
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