Sure --- it's a mess, though.

https://github.com/davidgiven/gruntle/blob/gruntle/build.nin...

https://github.com/davidgiven/gruntle/blob/gruntle/build

build is a tiny Lua preprocessor which expands templates in build.ninja.

It needs a cleanup but it works, it's way faster than gulp, and is much easier to debug. Haven't touched grunt so I don't know how it compares there.

Thanks. Could I get away without the Lua?

Yes, but you'd need to expand the source file rules inline --- I added the Lua because I was fed up with doing it by hand. (Ninja doesn't have implicit rules.)