Hi all,
here is a new toy:

  Emlua: a way to run a Lua interpreter inside Emacs as a module
  https://github.com/edrx/emlua

To test Emlua you will need: 1) an Emacs compiled with support for
dynamic modules, 2) liblua5.3-dev or something equivalent to it, and
3) eev. People with some practice with eev should be able to download,
compile, and test everything just by using the script that is here:

  https://github.com/edrx/emlua#testing-everything

The github page has lots of explanations, links, and even a
screenshot (!!!). Its last section says:

  This is a prototype!
  At this moment emlua isn't very useful per se, but it is very easy
  to hack and extend.

I hope that the code is well-commented enough.
Cheers & happy hacking,
  Eduardo Ochs
  http://angg.twu.net/#eev