Connect to a running Repl

You can connect to a REPL started elsewhere, for example the command line with lein repl, then connect to it from inside Spacemacs. You will need to know:

• host name / ip address
• port the repl is listening too

Spacemacs	Major mode	Emacs	Evil	Command
SPC m s c	M-RET s c	C-c M-c	, s c	cider-connect

Use the lein repl command to run a new REPL on the command line. Then connect to that REPL using M-x cider-connect

Configuration Required

If you are going to connect to an external repl from Spacemacs, you will need to add the Leiningen plugin called cider-nrepl and the Clojure tools.nrepl library. Rather than add this to all projects, you add these to your Leiningen configuration ~/.lein/profiles.clj file. The versions of each library also had to be kept in sync with updates in the Spacemacs Clojure layer.

{:dev {:plugins      [[cider/cider-nrepl "0.15.0-SNAPSHOT"]
                       [refactor-nrepl "2.3.0-SNAPSHOT"]]
        :dependencies [[org.clojure/tools.nrepl "0.2.12"]]}}

Without this configuration, you will see warning messages in the repl buffer stating that the versions of ... are out of sync.