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+// @name           every.js
+// @description    to run a specified command every time at specified interval.
+// @description-ja 指定のコマンドを指定の間隔で実行する。
+// @license        Creative Commons 2.1 (Attribution + Share Alike)
+// @version        1.0
+// @author         anekos (anekos@snca.net)
+// ==/VimperatorPlugin==
+//
+// Usage:
+//    :[INTERVAL]every <COMMAND>
+//      run <COMMAND> every time at [INTERVAL] sec.
+//
+//    :[INTERVAL]delay <COMMAND>
+//      run <COMMAND> after [INTERVAL] sec.
+//
+//    :every! <PROCESS-ID>
+//      kill specified process.
+//
+//    The default value of [INTERVAL] is 1 sec.
+//    While Vimperator's focus is at command-line,
+//    these commands does not run.
+//
+// Usage-ja:
+//    :[INTERVAL]every <COMMAND>
+//      [INTERVAL] 間隔で <COMMAND> を走らせる。
+//
+//    :[INTERVAL]delay <COMMAND>
+//      [INTERVAL] 秒後に <COMMAND> を走らせる。
+//
+//    :every! <PROCESS-ID>
+//      指定のプロセスを殺す。
+//
+//    [INTERVAL] のデフォルトは 1秒。
+//    コマンドラインにいるときには、実行されないようになっている。
+//
+// Links:
+//    http://d.hatena.ne.jp/nokturnalmortum/20081102#1225552718
+
+
+(function () {
+
+  let ps = [];
+
+  function run (command, interval) {
+    let fun = function () {
+      if (liberator.mode != liberator.modules.modes.COMMAND_LINE)
+        liberator.execute(command);
+    };
+    ps.push({
+      handle: setInterval(fun, interval),
+      command: command
+    });
+  }
+
+  function kill (index) {
+    if (index == '*') {
+      ps.forEach(function (process) clearInterval(process.handle));
+      liberator.echo(ps.length + ' processes were killed!');
+      ps = [];
+    } else {
+      let process = ps[index];
+      if (process) {
+        clearInterval(process.handle);
+        ps.splice(index, index);
+        liberator.echo('process "' + process.command + '" was killed!');
+      } else {
+        liberator.echoerr('unknown process');
+      }
+    }
+  }
+
+  function msec (count) {
+    return (count > 0) ? count * 1000 : 1000;
+  }
+
+  liberator.modules.commands.addUserCommand(
+    ['every', 'ev'],
+    'every',
+    function (arg, bang, count) {
+      if (bang) {
+        kill(arg.arguments[0]);
+      } else {
+        run(arg.string, msec(count));
+      }
+    },
+    {
+      count: true,
+      bang: true,
+      argCount: '+',
+      completer: function (str, bang) {
+        return bang ? [0, [['*', 'kill em all']].concat(ps.map(function (p, i) ([i, p.command])))]
+                    : liberator.modules.completion.ex(str);
+      }
+    }
+  );
+
+
+  liberator.modules.commands.addUserCommand(
+    ['delay'],
+    'delay',
+    function (arg, bang, count) {
+      let cmd = arg.string;
+      let f = function () {
+        if (liberator.mode == liberator.modules.modes.COMMAND_LINE) {
+          setTimeout(f, 500);
+        } else {
+          liberator.execute(cmd);
+        }
+      };
+      setTimeout(f, msec(count));
+    },
+    {
+      count: true,
+      argCount: '+',
+      completer: liberator.modules.completion.ex
+    }
+  );
+
+})();