Parinfer in Emacs Lisp
github.com
github.com
That said, I feel that this is a step in the wrong direction w.r.t. Lisp editing, because it focuses on vim-style text/line editing, and automatically rewriting structure around it. Editing with Parinfer or Lispy allows for structural manipulation, which is more usable and efficient IMO.
Are you sure you don't mean paredit or Lispy?
I'm a paredit user myself, and while it's very impressive and (obviously) the best mode for lisp ever, I recall it's learning curve being somewhat steep.
I think the author mentioned this was a mode trying to create an easier learning curve for lisp novices, which in itself isn't a bad goal.