[Haskell-cafe] preprocessor, how to?

[Magnus Therning]

On Mon, Jan 06, 2014 at 09:25:25PM +1300, Chris Wong wrote:
> You can use forward slashes in Windows as well.

It's worth clarifying this somewhat I think.  I found this at
http://is.gd/a5gCuk:

  Every version of Windows has accepted "/" as a path separator. So
  has every version of MS-DOS beginning with DOS 2.0 (the first
  version that had subdirectories).

  It's only been in command lines that "/" was not allowed, because it
  had already been used as a switch delimiter in MS-DOS 1.0.

So as long as you keep away from stuff like System.Process.system you
should be fine with ordinary slashes.

/M

> On Jan 6, 2014 9:13 PM, "Kees Bleijenberg" <k.bleijenberg at lijbrandt.nl>
> wrote:
> 
> > In a program I use a lot of hamlet files. All these hamlet files are in a
> > submap of the source map. In code:
> > allHtml = Mconcat   [  $(hamletFile "hamlet\\belastingen.hamlet") renderUrl
> >                        ,$(hamletFile "hamlet\\winddruk.hamlet") renderUrl
> >                       ..
> >                        ,$(hamletFile "hamlet\\berekeningDruk.hamlet")
> > renderUrl
> >                        ,$(hamletFile "hamlet\\drukNaarBuigTrek.hamlet")
> > renderUrl]
> > This is a Windows program.
> >
> > For another project I want to use this piece of code on Linux. The code
> > should now be:
> > .. $(hamletFile "hamlet/winddruk.hamlet") renderUrl
> >
> > I can't use pathSeparator here, because this is all happening at compile
> > time. So I think I need a preprocessor.
> > I would like to have a kind of hamletDir macro and change the code to
> > something like:
> >
> > #ifdef Win32
> >   hamletDir = "hamlet\\"
> > #else
> >   hamletDir = "hamlet/"
> > #endif
> > ...
> > $(hamletFile "{hamletDir}winddruk.hamlet") renderUrl
> > Is it possible in Haskell and how do I it?
> >
> > All examples of preprocessing in Haskell I found are something like this:
> > #ifdef xxx
> >         aaaa
> > #else
> >         Bbbbb
> > #endif
> > I could use that. But a user defined macro is less code.
> >
> > Kees
> >
> >
> >
> >
> >
> > _______________________________________________
> > Haskell-Cafe mailing list
> > Haskell-Cafe at haskell.org
> > http://www.haskell.org/mailman/listinfo/haskell-cafe
> >

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-- 
Magnus Therning                      OpenPGP: 0xAB4DFBA4 
email: magnus at therning.org   jabber: magnus at therning.org
twitter: magthe               http://therning.org/magnus

Unreadable code,
Why would anyone use it?
Learn a better way.
     -- Geoff Kuenning's contribution to the 2004 Perl Haiku Contest,
        Haikus about Perl - 'Dishonerable Mention' winner
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