Hugs uses cpphs for preprocessing the libraries, so there should already be a copy in the distribution. There is a copy of the source code, but not a compiled binary.
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.
Are you using -F? Actually the preprocessor is run twice on most files, due to the way Hugs handles imports.
Yes, I'm using -F, but with some additional tweaks because popen on WinHugs without a console spawns an additional console window every time it is run, which is most annoying, and plays havoc with the focus of the window.
None are terribly attractive (and they would only be for cpp).
I agree. Is there no other way to stop the preprocessor running on all files, and restricting it to just those which are needed?