fedex.rb

require 'httparty'
require 'ruby-growl'

class FedEx
  include HTTParty 
  format :html

  class << self
    @status, @location = nil, nil

    def current_status
      body = get("http://www.fedex.com/Tracking/Detail?ftc_start_url=&totalPieceNum=&backTo=&template_type=print&cntry_code=us&language=english&trackNum=#{@number}&pieceNum=&selectedTimeZone=localScanTime")
      status = body.scan(/DIV CLASS="undeliveredstatustop" style="clear:both">(.+)<\/DIV>/).first.first
      location = body.scan(/DIV CLASS="undeliveredstatus">(.+)<\/DIV>/).first.first
      {:status=>status, :location=>location}
    end

    def notify_if_different(status)
      puts 'checking...'
      return if @status == status[:status] && @location == status[:location]
      @status, @location = status[:status], status[:location]
      alert
    end

    def alert
      puts "Update: #{@status}: #{@location}"
      growl = Growl.new("localhost", "ruby-growl", ["fedex"], ["fedex"], nil)
      growl.notify("fedex", "FedEx Update", "#{@status}: #{@location}", 1, true)
    end

    def track(number)
      @number = number
      while true do
        notify_if_different current_status
        sleep 20
      end
    end
  end

end

FedEx.track(440021480538)