A long long time ago on a toy lisp called Interlisp/65 I used something that was like the s-exp equivalent of a line editor. https://atariwiki.org/wiki/Wiki.js

A long long time ago on a toy lisp called Interlisp/65 I used something that was like the s-exp equivalent of a line editor. https://atariwiki.org/wiki/Wiki.jsp?page=Lisp https://atariwiki.org/wiki/Wiki.jsp?page=Lisp Source is here: https://atariwiki.org/wiki/Wiki.jsp?page=LispEditor https://atariwiki.org/wiki/Wiki.jsp?page=LispEditor If you really wanted a vi-like experience for editing lisp, you could figure out how to make an editor like that full-screen and interactive.