2005/8/25, Ross Paterson
On Thu, Aug 25, 2005 at 12:03:25PM +0400, Bulat Ziganshin wrote:
Thursday, August 25, 2005, 7:37:39 AM, Frederik Eaton wrote: FE> I guess you could try to parse the "#!" line if MinGW is detected? ... FE> Anyway, it would seem that support for running "#!" scripts from FE> Haskell is a problem which is much more general than Cabal and should FE> be solved more centrally, like in the standard libraries.
i strongly agree. ignoring of first line if it starts from "#" must be added to all Haskell realizations
I think Frederik is suggesting that under Windows, System.Cmd.rawSystem and friends should examine the start of the file it is asked to execute, looking for #! and then try to simulate Unix behaviour. That might help some things, but it won't always work, so may not be worth it.
Haskell implementations already ignore lines starting with # if the file is a literate script.
It isn't so easy to simulate #! behaviour in rawSystem because the file path after #! is in Unix style. Cygwin keeps the mapping between Unix style paths and the native Windows paths. Usually /usr/bin/sh is mapped to something like c:\cygwin\bin\sh.exe. All executables which are compiled with cygwin.dll runtime library are working with Unix paths which are silently mapped to native paths. All GHC compiled executables are linked to the native msvcrt.dll runtime library so they understands only the native paths. I don't think that rawSystem should try to emulate Unix behaviour. Cheers, Krasimir