Make deps generic. Add draft symlink implementation.

src/leiningen/deps.clj

@@ -7,6 +7,34 @@
            [org.apache.maven.artifact.ant DependenciesTask RemoteRepository]
            [org.apache.tools.ant.util FlatFileNameMapper]))
 
+;; Add symlinking to Lancet's toolbox.
+(lancet/define-ant-task symlink symlink)
+
+;; Set this to one of :symlink or :copy to decide how dependencies are added to
+;; the library path."
+(def *copy-behavior* :copy)
+
+(defmulti copy-dependencies (fn [k destination flatten? fileset] k))
+
+(defmethod copy-dependencies :copy [k destination flatten? fileset]
+  (lancet/copy {:todir destination :flatten (if flatten? "on" "off")}
+               fileset))
+
+(defmethod copy-dependencies :symlink [k destination flatten? fileset]
+  (let [files (.getIncludedFiles (.getDirectoryScanner fileset lancet/ant-project))
+        dir (.getDir fileset)]
+
+    ;; In principle, this should work... but it doesn't.
+    ;; Instead we link each file in turn.
+    #_
+    (symlink {:action "record" :linkfilename destination}
+             fileset))
+
+    (doseq [f files]
+      (symlink {:link destination
+                :resource (.getCanonicalPath (java.io.File. dir f))})))
+
+
 ;; TODO: unify with pom.clj
 
 (defn make-exclusion [excl]
@@ -60,7 +88,8 @@ dependencies with the following:
            (.addDependency deps-task (make-dependency dep))))
        (.execute deps-task)
        (.mkdirs (file (:library-path project)))
-       (lancet/copy {:todir (:library-path project) :flatten "on"}
-                    (.getReference lancet/ant-project
-                                   (.getFilesetId deps-task)))))
+       (copy-dependencies *copy-behavior*
+                          (:library-path project) true 
+                          (.getReference lancet/ant-project
+                                         (.getFilesetId deps-task)))))
   ([project] (deps project false)))