This sounds very close to my dream IDE, I've always wanted to build a smalltalk + emacs like editor/ide in Clojure but never got around to it.

I wanted to try Easel but there were no instructions how. This is how I got it running:

  git clone git@github.com:phronmophobic/easel.git
  clj -X:deps prep
  clj
  # now in repl
  => ((requiring-resolve 'com.phronemophobic.easel/run))