If you are interested in small Lua-based text editors, I advise you to take a look at Textadept: https://foicica.com/textadept/ . Specifically as to minimalism: "Relentlessly optimized for speed and minimalism over the years, the editor consists of less than 2000 lines of C code and less than 4000 lines of Lua code." I believe this is a limit that the editor's author self-imposed and keeps to it with an impressive st…
texadept is great, it can handle really large files where most other editors crash/die.
From textadepts FAQ:
Q: Why can’t Textadept handle HUGE files very well?
A: Textadept is an editor for programmers. It is unlikely a programmer would be editing a gigantic log file. There are other tools for that case.