Built-in method to get path of current gyp/gypi file? #129

I'm working on a module that helps with build/OS environment checking (similar to autoconf) and would like to have a standardized placement of the file that describes the checking to be done. Ideally the user would just stick the file in the same directory as the relevant gyp that utilizes it, but I'm not sure if the path to the current gyp/gypi (with or without filename included) is available in one way or another?

I've looked through the documentation but don't see anything obvious standing out.