My son recently attended a "Coding with Minecraft" class at the library. He enjoyed himself and wanted to play with it at home. Since we don't have minecraft, I decided to see how hard it would be to implement it in minetest. The class used scriptcaft. After a little playing around, I managed to load the duktape javascript engine in minetest and get echo working. It's just a prototype at the moment. I don't have compiling/installing instructions yet.
https://github.com/dulsi/scriptmine
Why use javascript instead of just teaching him lua? Because he has friends using minecraft. If he has a compatible mod, they can trade scripts. Also scriptcraft is hard for people to install. If I had a simple package with minetest, I can probably get more people to try it out.