Very nice! Reminds me of Markdeep diagrams [1]. The examples are almost identical, so I'm curious if one of them should give credit to the other? Or was there a shared ancestor?

Either way, the core insight that it's OK to map the the monospace grid 1:1 to diagram coordinates was IMHO a breakthrough in text->diagram conversion that previous tools like ditaa missed by trying too hard to parse "semantic structure". (After that it's 99% perspiration of course.)

The editor is pretty great.

[1] https://casual-effects.com/markdeep/features.md.html#basicfo...