Ubiquity timezone command for Firefox

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var noun_type_city = {
  _name: "city",
  _cities: undefined,

  _fetchCityOffsets: function(callback, prefix) {
    if (this._cities) {
      this._suggestCities(callback, prefix)
    } else {
      var self = this
      jQuery.get( 'http://www.raphscallion.com/clock/timezones.php', {}, function( response ) {
        var lines = response.split('\n')
        var offsets = lines.reduce(function(dict, line) {
          var matches = /^\w+\/([\w_]+) (\d+)/.exec(line)
          if (!matches) return dict
          var city = matches[1].replace('_', ' ').toLowerCase()
          var offset = parseInt(matches[2])
          dict[city] = offset
          return dict
        }, {})
        var cities = []
        for (var city in offsets) {
          cities.push(city)
        }

        self._cities = cities;
        self._offsets = offsets
        
        self._suggestCities(callback, prefix)
      })
    }
  },

  _suggestCities: function(callback, prefix) {
    this._cities.filter(function(city) {
      return city.indexOf(prefix.toLowerCase()) == 0
    }).forEach(function(city) {
      callback(CmdUtils.makeSugg(city))
    })
  },

  getTimeAt: function(city) {
    var gmtOffsetMinutes = this._offsets[city]
    if (gmtOffsetMinutes == undefined) return 'unknown'
    var timeHere = (new Date).getTime()
    var timeThere = timeHere + gmtOffsetMinutes * 60 * 1000
    return new Date(timeThere)
  },

  suggest: function (text, html, callback) {
    this._fetchCityOffsets(callback, text)
    return [CmdUtils.makeSugg()];    
  }
}

CmdUtils.CreateCommand({
  name: "time",
  takes: {"city": noun_type_city },
  preview: function( previewBlock, city ) {
    var template = "The current time in ${city} is ${time}"
    var timeThere = noun_type_city.getTimeAt(city.text)
    previewBlock.innerHTML = CmdUtils.renderTemplate( template, {'city': city.text, 'time': timeThere} )
  },
  execute: function(city) {
    displayMessage( noun_type_city.getTimeAt(city.text).toString() );
  }
})