clojure.osgi aware nREPL middleware

gistfile1.clj

(defn osgi-bundle-handler
  "If the namespace currently associated with this REPL has an OSGi
  bundle associated, use this to set osgi/*bundle* and
  clojure.lang.Compiler/LOADER."
  [h]
  (fn [msg]
    (let [ns-meta (meta (get (deref (:session msg)) #'clojure.core/*ns*))
          bundle (and ns-meta (:clojure.osgi.core/bundle ns-meta))
          classloader (or (:repl-classloader ns-meta)
                          (and bundle (osgi/bundle-class-loader bundle)))
          dynamic-loader (and classloader (clojure.lang.DynamicClassLoader. classloader))]
      (when bundle
        (swap! (:session msg) assoc #'osgi/*bundle* bundle))
      (when dynamic-loader
        (swap! (:session msg) assoc clojure.lang.Compiler/LOADER dynamic-loader))
      (h msg))))