diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e04714b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+/target
+/classes
+/checkouts
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+/.lein-*
+/.nrepl-port
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..d6c408d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,33 @@
+# lein-watch
+
+A Leiningen plugin to watch directories and run tasks automatically.
+
+## Usage
+
+Put `[lein-watch "0.1.0-SNAPSHOT"]` into the `:plugins` vector of your project.clj and
+add :watch configuration to your project.clj.
+
+Example configuration (run compile task when .clj files changes) :
+
+    (defproject sample-project
+      ...
+      :watch {
+        :rate 500 ;; check file every 500ms (use 'watchtower' intanally)
+        :watches {
+          :compile {
+            :watch-dirs ["src"]
+            :file-patterns [#"\.clj"]
+            :tasks ["compile"]}}}
+      ...)
+
+and just run watch task
+
+    $ lein watch
+
+See [sample-project](http://github.com/runoshun/lein-watch/sample-project) for more complex usage.
+
+## License
+
+Distributed under the MIT License.
+
+Copyright © 2014 runoshun
diff --git a/project.clj b/project.clj
new file mode 100644
index 0000000..df8aa04
--- /dev/null
+++ b/project.clj
@@ -0,0 +1,7 @@
+(defproject lein-watch "0.0.1"
+  :description "A Leiningen plugin to watch directories and run tasks automatically."
+  :url "http://github.com/runoshun/lein-watch"
+  :license {:name "MIT"
+            :url "http://opensource.org/licenses/MIT"}
+  :dependencies [[watchtower "0.1.1"]]
+  :eval-in-leiningen true)
diff --git a/sample-project/.gitignore b/sample-project/.gitignore
new file mode 100644
index 0000000..e04714b
--- /dev/null
+++ b/sample-project/.gitignore
@@ -0,0 +1,9 @@
+/target
+/classes
+/checkouts
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+/.lein-*
+/.nrepl-port
diff --git a/sample-project/README.md b/sample-project/README.md
new file mode 100644
index 0000000..06fea3c
--- /dev/null
+++ b/sample-project/README.md
@@ -0,0 +1,9 @@
+# sample-project for lein-watch plugin
+
+See `project.clj`
+
+## License
+
+Distributed under the MIT License.
+
+Copyright © 2014 FIXME
diff --git a/sample-project/doc/intro.md b/sample-project/doc/intro.md
new file mode 100644
index 0000000..138fbda
--- /dev/null
+++ b/sample-project/doc/intro.md
@@ -0,0 +1,3 @@
+# Introduction to test-watch
+
+TODO: write [great documentation](http://jacobian.org/writing/great-documentation/what-to-write/)
diff --git a/sample-project/project.clj b/sample-project/project.clj
new file mode 100644
index 0000000..f2d0bb1
--- /dev/null
+++ b/sample-project/project.clj
@@ -0,0 +1,57 @@
+(defproject watch-sample "0.1.0-SNAPSHOT"
+  :license {:name "Eclipse Public License"
+            :url "http://www.eclipse.org/legal/epl-v10.html"}
+
+  ;; use 'lein-watch' plugin
+  :plugins [[lein-watch "0.0.1"]
+            [lein-garden "0.1.8"]]
+  :dependencies [[org.clojure/clojure "1.5.1"]]
+
+  ;; profiles used in watch tasks
+  :profiles {:garden {:source-paths ["src-garden"]
+                      :dependencies [[garden "1.1.5"]]}
+             :hiccup {:source-paths ["src-hiccup"]
+                      :dependencies [[hiccup "1.0.5"]]}}
+
+  :garden {
+    :builds [{:id "screen"
+              :stylesheet test-watch.css/screen
+              :compiler {:output-to "resources/public/screen.css"
+                         :pretty-print true}}]}
+
+  ;; configuration for 'lein-watch'
+  :watch {
+    ;; polling rate in 'ms' (it's directory passed to 'watchtower')
+    :rate 300
+
+    ;; watcher definition
+    :watchers {
+      ;; run 'lein garden once' when *.clj file under the 'src-garden' changed.
+      :garden {;; :watch-dirs (required) : vector of string
+               ;;   Put directories that you want watch.
+               :watch-dirs ["src-garden"]
+
+               ;; :file-patterns (optional) : vector of java.util.regex.Pattern
+               ;;   If file name that changed is matched this patterns, tasks are executed.
+               ;;   otherwise not executed.
+               ;;   default : [#".*"].
+               :file-patterns [#"\.clj"]
+
+               ;; :tasks (required) : vector of (string|symbol)
+               ;;   Put tasks that you want executed when file changed.
+               ;;   If a value is string, it is evaluated as a leiningen task.
+               ;;   If a value is symbol, it is called as a function in project context and
+               ;;   is passed changed file as argument.
+               :tasks ["garden once"]
+
+               ;; profiles (optional) : vector of keyword
+               ;;   profile names used when executing tasks.
+               ;;   default : []
+               :profiles [:garden]}
+      ;; call 'test-watch.hiccup/generate' (defined in 'src-hiccup/test_watch/hiccup.clj')
+      ;; when *.clj file under the 'src-hiccup' changed.
+      :hiccup {:watch-dirs ["src-hiccup"]
+               :profiles [:hiccup]
+               :file-patterns [#"\.clj"]
+               :tasks [test-watch.hiccup/generate]}}})
+
diff --git a/sample-project/resources/public/index.html b/sample-project/resources/public/index.html
new file mode 100644
index 0000000..eff07d8
--- /dev/null
+++ b/sample-project/resources/public/index.html
@@ -0,0 +1 @@
+<html><head><link href="screen.css" rel="stylesheet" type="text/css" /></head><body><div><span>Hello world</span></div></body></html>
\ No newline at end of file
diff --git a/sample-project/resources/public/screen.css b/sample-project/resources/public/screen.css
new file mode 100644
index 0000000..00fb820
--- /dev/null
+++ b/sample-project/resources/public/screen.css
@@ -0,0 +1,5 @@
+body {
+  line-height: 1.5;
+  font-size: 20px;
+  font-family: sans-serif;
+}
\ No newline at end of file
diff --git a/sample-project/src-garden/test_watch/css.clj b/sample-project/src-garden/test_watch/css.clj
new file mode 100644
index 0000000..6501207
--- /dev/null
+++ b/sample-project/src-garden/test_watch/css.clj
@@ -0,0 +1,9 @@
+(ns test-watch.css
+  (:require [garden.def :refer [defstylesheet defstyles]]
+            [garden.units :refer [px]]))
+
+(defstyles screen
+  [:body
+   {:font-family "sans-serif"
+    :font-size (px 20)
+    :line-height 1.5}])
diff --git a/sample-project/src-hiccup/test_watch/hiccup.clj b/sample-project/src-hiccup/test_watch/hiccup.clj
new file mode 100644
index 0000000..0d90af0
--- /dev/null
+++ b/sample-project/src-hiccup/test_watch/hiccup.clj
@@ -0,0 +1,9 @@
+(ns test-watch.hiccup
+  (:require [hiccup.core :refer [html]]))
+
+(defn generate [& _]
+  (spit "resources/public/index.html"
+        (html [:html
+               [:head [:link {:rel "stylesheet" :type "text/css" :href "screen.css"}]]
+               [:body [:div [:span "Hello world"]]]])))
+
diff --git a/sample-project/src/test_watch/core.clj b/sample-project/src/test_watch/core.clj
new file mode 100644
index 0000000..01bc78b
--- /dev/null
+++ b/sample-project/src/test_watch/core.clj
@@ -0,0 +1,6 @@
+(ns test-watch.core)
+
+(defn foo
+  "I don't do a whole lot."
+  [x]
+  (println x "Hello, World!"))
diff --git a/sample-project/test/test_watch/core_test.clj b/sample-project/test/test_watch/core_test.clj
new file mode 100644
index 0000000..de70f6e
--- /dev/null
+++ b/sample-project/test/test_watch/core_test.clj
@@ -0,0 +1,7 @@
+(ns test-watch.core-test
+  (:require [clojure.test :refer :all]
+            [test-watch.core :refer :all]))
+
+(deftest a-test
+  (testing "FIXME, I fail."
+    (is (= 0 1))))
diff --git a/src/leiningen/watch.clj b/src/leiningen/watch.clj
new file mode 100644
index 0000000..5809a41
--- /dev/null
+++ b/src/leiningen/watch.clj
@@ -0,0 +1,111 @@
+(ns leiningen.watch
+  (:require [clojure.string :as string]
+            [clojure.java.io :as io]
+            [watchtower.core :as wt]
+            [leiningen.core.eval :as lein-eval]
+            [leiningen.core.main :as lein-main]
+            [leiningen.core.project :as lein-project]))
+
+(def ^:private default-watcher-options
+  {:file-patterns [#".*"]
+   :profiles []})
+
+(def ^:private default-global-settings
+  {:rate 300})
+
+(defn- non-nils [coll] (remove nil? coll))
+
+(defn- ensure-regex [pat]
+  (if (instance? java.util.regex.Pattern pat)
+    pat
+    (re-pattern pat)))
+
+(defn- match? [patterns file]
+  (boolean (first (non-nils (map #(re-find % (str file))
+                                (map ensure-regex  patterns))))))
+
+(defn- child? [parent child]
+  (not (.isAbsolute (.relativize (.toURI (io/file parent))
+                                 (.toURI (io/file child))))))
+
+(defn- make-route [dir patterns group]
+  (fn [file]
+    (if (and (child? dir file) (match? patterns file))
+      group
+      nil)))
+
+(defn- make-router [watchers]
+  (fn [file]
+    (let [routes (mapcat (fn [group]
+                           (let [options (group watchers)
+                                 patterns (-> options :file-patterns)
+                                 dirs (-> options :watch-dirs)]
+                             (map (fn [dir] (make-route dir patterns group)) dirs)))
+                         (keys watchers))]
+      (first (non-nils (map #(% file) routes))))))
+
+(defn- separate-ns [sym]
+  (let [syms (string/split (str sym) #"/")]
+    (if (= 2 (count syms))
+      (symbol (first syms))
+      nil)))
+
+(defn- run-tasks [project watcher file]
+  (let [project (lein-project/merge-profiles project (:profiles watcher))
+        tasks (:tasks watcher)]
+    (println (str "[lein-watch] file changed : " file))
+    (println (str "[lein-watch] run-tasks : " tasks))
+    (doseq [task tasks]
+      (cond
+        (string? task) (lein-main/resolve-and-apply
+                         project
+                         (string/split (string/replace-first task #"%f" (str file)) #"\s+"))
+        (symbol task) (let [ns (separate-ns task)
+                            file-str (.getAbsolutePath file)
+                            form (if ns
+                                   `(do (require '~ns) (~task ~file-str))
+                                   `(~task ~file-str))]
+                        (lein-eval/eval-in-project project form))))))
+
+(defn- ensure-slash [dir]
+  (if-not (.endsWith dir "/")
+    (str dir "/")
+    dir))
+
+(defn watch
+  "Watch directories and run tasks when file changed."
+  [project & args]
+  (let [settings (:watch project)
+        settings (merge default-global-settings settings)
+        watchers (:watchers settings)
+        watchers (reduce (fn [m [k v]] (assoc m k (merge default-watcher-options v))) {} watchers)
+        router (make-router watchers)
+        dirs (map ensure-slash (mapcat :watch-dirs (vals watchers)))
+        process-event (fn [files]
+                        (doseq [file files]
+                          (run-tasks project (watchers (router file)) file)))]
+    (if watchers
+      (deref
+        (wt/watcher dirs
+                    (wt/rate (:rate settings))
+                    (wt/on-change process-event)))
+      (println "no watcher found."))))
+
+(comment
+(do
+  (def project
+    {:watch
+     {:watchers
+      {:garden {:watch-dirs ["src-garden"]
+                :file-patterns [#".*"]
+                :tasks ["garden once"]}
+       :hiccup {:watch-dirs ["src-hiccup"]
+                :file-patterns [#"\.txt"]
+                :tasks ["hiccpu once"]}}}})
+
+  (def router (make-router (-> project :watch :watchers)))
+  (assert (= (router (io/file "src-garden/foo")) :garden))
+  (assert (= (router "src-hiccup/bar") nil))
+  (assert (= (router "src-hiccup/bar.txt") :hiccup))
+
+))