Similarly, if there are any pointers to references on
some other data
structures in editors like TECO, QED and E, I’d welcome them as
well.
The classic is "cookbook for an emacs" but it's from 1980
https://dspace.mit.edu/handle/1721.1/15905
There's also this that's 25 years more recent but 16 years old:
https://ecc-comp.blogspot.com/2015/05/a-brief-glance-at-how-5-text-editors.…
And this:
https://nullprogram.com/blog/2017/09/07/