the ability to turn txt into a diagram is intriguing
I think before there were GUI tools for editing ladder diagrams [0], there were tools that would read ASCII-art diagrams, and program PLCs with the corresponding logic. However, a quick Google didn't give a source confirming this.
[0]: https://en.wikipedia.org/wiki/Ladder_logic https://en.wikipedia.org/wiki/PGF/TikZ
Screen cast showing it off: http://www.cinsk.org/emacs/emacs-artist.html