Hi, I'm looking into implementing C preprocessing in WinHugs. I've looked around and bundling a copy of cpphs seems like the best solution, since few windows users will have a cpp hanging around somewhere that can be found. I've hacked together a basic implementation, the only thing is that its a lot slower, mainly because its being run on every single file which is completely unneeded. Is there some way to detect if a hs file requires preprocessing? If not, its almost going to be better to stick with no preprocessing, and have a faster development environment. The ways I thought of were: * Add some magic to the parser, so that if it encounters a # at the start of a line, it bails out and restarts again after preprocessing. * Only preprocess .cpp.hs or .hscpp or some other special suffix as having cpp directives. * Look into the file for some sort of command line arguments pragma on the first line denoting preprocessing. Thoughts? Thanks Neil