There's some discussion in #unrepl about a new repl protocol that uses edn or something similar. A few parties here may be interested

2 approaches to an unrepl client: 1) write an edn parser in vimscript, and parse right off the stdin/stdout 2) Use an existing edn parser in a 3rd party language, and run callbacks into vimscript (piece of cake via the rpc in neovim)

Maintaining anything minimally complex in vimscript is a pain...