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+// ==VimperatorPlugin==
+// @name           Auto Source
+// @description    Sourcing automatically when the specified file is modified.
+// @description-ja 指定のファイルが変更されたら自動で :so する。
+// @license        Creative Commons 2.1 (Attribution + Share Alike)
+// @version        1.0
+// @author         anekos (anekos@snca.net)
+// @maxVersion     2.0pre
+// @minVersion     2.0pre
+// ==/VimperatorPlugin==
+//
+// Usage:
+//    Start watching
+//      :aso taro.js
+//      :autoso[urce] taro.js
+//    Stop watching
+//      :aso! taro.js
+//      :autoso[urce]! taro.js
+//
+// Usage-ja:
+//    監視を開始
+//      :aso taro.js
+//      :autoso[urce] taro.js
+//    監視を中止
+//      :aso! taro.js
+//      :autoso[urce]! taro.js
+//
+// Links:
+//    http://d.hatena.ne.jp/nokturnalmortum/20081114#1226652163
+//    http://p-pit.net/rozen/
+
+(function () {
+
+  let files = {};
+  let firstTime = window.eval(liberator.globalVariables.auto_source_first_time || 'false');
+  let interval = window.eval(liberator.globalVariables.auto_source_interval || '500');
+
+  function getFileModifiedTime (filepath) {
+    let file = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsILocalFile);
+    file.initWithPath(filepath);
+    return file.lastModifiedTime;
+  }
+
+  function startWatching (filepath) {
+    if (files[filepath] !== undefined)
+      throw "The file has already been watched: " + filepath;
+    let last = firstTime ? null : getFileModifiedTime(filepath);
+    files[filepath] = setInterval(function () {
+      let current = getFileModifiedTime(filepath);
+      if (last != current) {
+        liberator.log('sourcing: ' + filepath);
+        last = current;
+        io.source(filepath);
+      }
+    }, interval);
+  }
+
+  function killWatcher (filepath) {
+    if (files[filepath] === undefined)
+      throw "The file is not watched: " + filepath;
+    clearInterval(files[filepath]);
+    delete files[filepath];
+  }
+
+  commands.addUserCommand(
+    ['autoso[urce]', 'aso'],
+    'Sourcing automatically when the specified file is modified.',
+    function (arg, bang) {
+      liberator.log(arg);
+      liberator.log(io.expandPath(arg.string));
+      (bang ? killWatcher : startWatching)(io.expandPath(arg.string));
+    },
+    {
+      bang: true,
+      completer: function (arg, bang) {
+        return bang ? [0, [[filepath, ''] for (filepath in files)]]
+                    : completion.file.apply(this, arguments);
+      }
+    },
+    true
+  );
+
+})();