Download plugins. RT/addURL is a nest of filthy lies.

bin/lein

@@ -40,7 +40,7 @@ if [ "$LEIN_HOME" = "" ]; then
   fi
 fi
 
-DEV_PLUGINS="$(ls -1 lib/dev/*jar 2> /dev/null)"
+DEV_PLUGINS="$(ls -1 lib/dev/*jar .lein-plugins/*jar 2> /dev/null)"
 USER_PLUGINS="$(ls -1 "$LEIN_HOME"/plugins/*jar 2> /dev/null)"
 
 artifact_name () {

sample.project.clj

@@ -37,9 +37,13 @@
                                               javax.jms/jms
                                               com.sun.jdmk/jmxtools
                                               com.sun.jmx/jmxri]]]
+  ;; The plugins listed here will be accessible in Leiningen's own
+  ;; process, but not in the project.
+  :plugins [[lein-tar "1.0.6"]]
   ;; Dev dependencies are intended for use only during
   ;; development. Projects that depend on this project will not pull
   ;; in its dev-dependencies, and they won't be included in the uberjar.
+  ;; These will appear both in Leiningen's process and the project's.
   :dev-dependencies [[org.clojure/swank-clojure "1.2.1"]]
   ;; Global exclusions are applied across the board, as an alternative
   ;; to duplication for multiple depedencies with the same excluded libraries.

src/leiningen/deps.clj

@@ -1,6 +1,7 @@
 (ns leiningen.deps
   "Download all dependencies and put them in :library-path."
-  (:require [lancet.core :as lancet])
+  (:require [lancet.core :as lancet]
+            [clojure.string :as string])
   (:use [leiningen.core :only [repositories-for user-settings
                                *current-task* no-dev?]]
         [leiningen.clean :only [clean]]
@@ -109,12 +110,13 @@
   (.toString (BigInteger. 1 (-> (MessageDigest/getInstance "SHA1")
                                 (.digest (.getBytes content)))) 16))
 
-(defn- deps-checksum [project]
-  (sha1-digest (pr-str [(:dependencies project)
-                        (:dev-dependencies project)])))
+(defn- deps-checksum
+  ([project keys] (sha1-digest (pr-str (map project keys))))
+  ([project] (deps-checksum project [:dependencies :dev-dependencies])))
 
-(defn- new-deps-checksum-file [project]
-  (File. (:root project) ".lein-deps-sum"))
+(defn- new-deps-checksum-file
+  ([project name] (File. (:root project) name))
+  ([project] (new-deps-checksum-file project ".lein-deps-sum")))
 
 (defn- has-dependencies? [project]
   (some (comp seq project) [:dependencies :dev-dependencies]))
@@ -184,11 +186,25 @@
         (.mkdirs f)
         (copy (.getInputStream jar entry) f)))))
 
+(defn download-plugins [project]
+  (let [dir (.getAbsolutePath (file (:root project) ".lein-plugins"))]
+    (when (and (seq (:plugins project))
+               (or (not (.exists (file dir "checksum")))
+                   (not= (deps-checksum project [:plugins])
+                         (slurp (file dir "checksum")))))
+      (.setContextClassLoader (Thread/currentThread) (doto classloader prn))
+      (doseq [plugin (-> (do-deps (assoc project :library-path dir) :plugins)
+                         .getDirectoryScanner .getIncludedFiles)]
+        #_(clojure.lang.RT/addURL (str "file://" dir "/" plugin)))
+      (spit (file dir "checksum")
+            (deps-checksum project [:plugins])))))
+
 (defn deps
   "Download :dependencies and put them in :library-path."
   [project & [skip-dev]]
   (when skip-dev
     (println "WARNING: passing an argument to deps is deprecated."))
+  (download-plugins project)
   (when (fetch-deps? project)
     (when-not (or (:disable-deps-clean project)
                   (:disable-implicit-clean project))

src/leiningen/jar.clj

@@ -35,7 +35,8 @@
   ([{:keys [group name version]}]
      (unix-path (format
                  "%s/%s/%s/%s/%s-%s.jar"
-                 (.getBasedir (make-local-repo)) (.replace group "." "/") name version name version))))
+                 (.getBasedir (make-local-repo))
+                 (.replace group "." "/") name version name version))))
 
 (defn- script-classpath-for [project deps-fileset system]
   (let [deps (when deps-fileset