build: automatically generate some file lists that the GN build uses

[nornagon]

This moves the hard-coded lists of source files into a generated .json file, which might make maintaining the GN build files a little easier, maybe?

[refack]

Interesting idea. I was just considering coding a tool for going the other way from V8 gn files...
FYI: nodejs/node#22920, I'm refactoring severl .gyp files and lists. I'd be happy to port those here, when I'm done.

[ryzokuken]

Awesome idea. One thing though: is it not a priority to make the .py file PEP8 compliant?

[nornagon]

@refack it would be super awesome if the "source of truth" for file lists like this was in a cross-build-system-compatible format, like JSON!

@ryzokuken good point, the python here was mostly POC, but I'll go clean it up :)

[nornagon]

Updated to reformat and clean up the python a little.

BTW, I noticed most of the python files in tools/ aren't PEP-8 compatible either. Is that a standard that node recently adopted?

[ryzokuken]

@nornagon 💯for the reformatting.

I don't even know if other peeps are node care a lot about PEP-8, but I think we should. I personally try to avoid straying away from it.