Explain how to use in Leiningen 2.x.

.gitignore

@@ -5,3 +5,4 @@ pom.xml
 .lein-deps-sum
 /.lein-plugins/checksum
 /test-project/.lein-plugins/checksum
+target

README.md

@@ -4,16 +4,19 @@ Compile Scala source from Leiningen.
 
 ## Usage
 
-Add [lein-scalac "0.1.0"] to `:plugins` project.clj. (Or
+Add `[lein-scalac "0.1.0"]` to `:plugins` project.clj. (Or
 `:dev-dependencies` on Leiningen versions earlier than 1.7.0)
 
 Set `:scala-source-path` in project.clj, usually to "src/scala", and
 place your `.scala` source files in there.
 
 Run `lein scalac` to compile them to `.class` files.
 
-If you'd like `scalac` to run before every `compile` invocation you
-can add `leiningen.hooks.scalac` to `:hooks` in project.clj.
+If you want `scalac` to run automatically, add `:prep-tasks ["scalac"]`
+to `project.clj`
+
+For Leiningen 1.x support, need to add `leiningen.hooks.scalac` to
+`:hooks` in project.clj.
 
 ## License
 

src/leiningen/hooks/scalac.clj

@@ -2,6 +2,8 @@
   (:require [robert.hooke]
             [leiningen.compile]))
 
+;; This is only needed in Leiningen 1.x
+
 (robert.hooke/add-hook (resolve 'leiningen.compile/prep)
                        (fn [f project & args]
                          ;; Don't load scalac at every lein launch.

test-project/project.clj

@@ -1,8 +1,10 @@
 (defproject test-project "0.1.0"
   :description "test project with some scala"
-  :dependencies [[org.clojure/clojure "1.3.0"]
+  :dependencies [[org.clojure/clojure "1.4.0"]
                  [org.scala-lang/scala-library "2.9.1"]]
+  :scala-source-path "scala"
   :plugins [[lein-scalac "0.1.0"]]
-  :hooks [leiningen.hooks.scalac]
-  :source-path "src/clj"
-  :scala-source-path "src/scala")
+  :prep-tasks ["scalac"]
+  ;; for Leiningen 1.x you need this instead:
+  ;; :hooks [leiningen.hooks.scalac]
+  :main test-project.core)