Automatically folding #defines in vim

Question

I work with quite a bit of multi-platform C/C++ code, separated by common #defines (#if WIN, #if UNIX, etc). It would be nice if I could have vim automatically fold the sections I'm currently not interested in when I open a file. I've searched through the vim script archives, but I haven't found anything useful. Any suggestions? Places to start?

Answer 1

Just add a folding region to your syntax http://vim.wikia.com/wiki/Syntax_folding_of_Vim_scripts#Syntax_definitions

:syn region myFold start="\#IF" end="\#ENDIF" transparent fold
:syn sync fromstart
:set foldmethod=syntax

Answer 2

To add to @hometoasts answer, you can add that command as a comment in the first ten or last ten lines of the file and vim will automatically use it for that file.

    /* vim: syn region regionName start="regex" end="regex": */