I don't quite understand why you can't just use pathSeparator (or ) here. The code in the quotes is still Haskell, and it's going to compile on the same platform it's going to run on, right? Erik On Mon, Jan 6, 2014 at 9:13 AM, Kees Bleijenberg 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

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