How to update Clojure Leiningen Emacs tool chain on Mac OS

Question

I have a working Clojure-1.4.0 / emacs24 / leiningen-2.0 tool chain working on Mac OSX 10.8. I got it going very quickly by following the instructions at the following URLs:

http://clojure.org/getting_started
https://github.com/technomancy/leiningen
http://clojure-doc.org/articles/tutorials/emacs.html

One way I check that it works is I go to a project directory and type

lein test

and it runs all the unit tests in my project directory. I can also do C-c , in clojure-mode in emacs, and it does the same thing. Great! Now the question: all this runs the clojure installation I have in ~/clojure-1.4.0, which I see by typing

lein repl

in a project directory. I have a new installation of clojure in ~/clojure-1.5.0 now, and I would like to make leiningen and emacs point to that new version. However, during the setup of leiningen and the emacs mode, I never manually told them where to find the clojure version. They found that magically and opaquely -- in fact, the whole process was very magic, and that was great at that time. I suppose I could tear everything down and build it up again from scratch, but that seems brute-forcedly inefficient. I could also hack-replace the files in the 1.4 directory with the files from the 1.5 directory. That might work one time, but it's so obviously wrong I really don't want to think about it. I need to do this the right way so that when the next version updates come along, I can keep the toolchain going as smoothly as possible.

I am just starting with all this, so I am far from mastery of any of these tools and I'll be grateful for noob-level advice on keeping it all going.

mobyte mobyte · Accepted Answer · 2013-03-03T16:15:18

Just change clojure version in ./project.clj in your project directory:

:dependencies [... [org.clojure/clojure "1.5.0"] ...]

test:

$ lein repl

user=> *clojure-version*
{:major 1, :minor 5, :incremental 0, :qualifier nil}

Edit:

They found that magically and opaquely

Default clojure version is built into lein's project.clj template which renders to your <name>/project.clj file when you do lein new <name>.

How to update Clojure Leiningen Emacs tool chain on Mac OS

1 Answers