// config.get() and config.set() store config data in (near-)json in prefs.js.
var config = (function(data) {
  function get(name, value) {
    return data.hasOwnProperty(name) ? data[name] : value;
  }
  function set(name, value) {
    if (value === undefined)
      delete data[name];
    else
      data[name] = value;
    GM_setValue("config", uneval(data));
    return value;
  }
  function keys(re) {
    re = re || /./;
    var list = [];
    for (var id in data)
      if (data.hasOwnProperty(id) && id.test(re))
        list.push(id);
    return list;
  }
  function remove(id) {
    if (/function|object/.test(typeof id)) {
      var value = [], re = id;
      for (id in data)
        if (data.hasOwnProperty(id) && id.test(re)) {
          value.push(data[id]);
          delete data[id];
        }
    } else {
      value = data[id];
      delete data[id];
    }
    return value;
  }
  return { get:get, set:set, keys:keys, remove:remove };
})(eval(GM_getValue("config", "({})")));