leiningen, clojure 1.2 and emacs

I had a bit of a struggle today.

I was trying to have a play with defrecord in clojure 1.2 in preparation for the May dojo. This meant that I needed to move up to clojure 1.2 as defrecord is new functionality. After much flailing, some help from technomancy and tcrayford on irc (Thanks!) I was able to get something up and running. Here is what works.

The most basic project.clj for this is:

(defproject my-proj "0.0.1"
:description "The simplest clojure 1.2 project.clj possible for emacs"
:dependencies [[org.clojure/clojure "1.2.0-master-SNAPSHOT"]
[org.clojure/clojure-contrib "1.2.0-SNAPSHOT"]]
:dev-dependencies [[swank-clojure "1.2.0"]]
:repositories {"clojure-releases" "http://build.clojure.org/releases"})


This is enough to get lein swank up and running. However, now clojure-test-mode won’t work. The version is elpa isn’t new enough (you are using elpa and emacs-starter-kit aren’t you?) so we need to get it from technomancy’s github.

Find a nice directory to keep the code and do the following:

$ git clone http://github.com/technomancy/clojure-mode.git


Then open up emacs and open the cloned clojure-mode.el file and type M-x package-install-from-buffer. Then do the same for clojure-test-mode.el. Now everything should work. You should be able to start lein swank from the command line and then connect to it using M-x slime-connect and do things like run the test cases using C-c , and do things like slime-who-calls (and make tcrayford happy.

Soon these versions should be in elpa and so you won’t need these instructions any more.

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