Moving a namespace in a clj/cljs/cljc project with mranderson

move-namespace.clj

;; needed if you don't use leiningen
(do
  (create-ns 'leiningen.core.main)
  (intern 'leiningen.core.main 'warn #(apply println "[warn]" %&))
  (intern 'leiningen.core.main 'info #(apply println "[info]" %&))
  (intern 'leiningen.core.main 'debug #(apply println "[debug]" %&))
  (dosync (commute @#'clojure.core/*loaded-libs* conj 'leiningen.core.main)))

(require '[mranderson.move :as move])
(require '[clojure.java.io :as io])
(require '[clojure.string :as str])

(defn munge-name [lib]
  (.. (name lib)
      (replace \- \_)
      (replace \. \/)))

(defn ns-file [sym]
  (io/file (some #(io/resource (str (munge-name sym) "." %)) ["clj" "cljc" "cljs"])))

(defn ns-extension [ns-name]
  (let [f (str (ns-file ns-name))]
    (subs f (str/last-index-of f "."))))

(move/move-ns 
  'io.your.app.logging ;; source namespace
  'io.your.app.log ;; target namespace
  (io/file "src") ;; where one can find your namespace
  (ns-extension 'io.your.app.logging)
  (list (io/file "src")) ;; all directories where namespaces should be renamed
  nil)

Credit for the snippet goes to @plexus.