class CheckPagePlugin < Plugin

  URL_CHECKED  = "http://www.example.com" # URL of the page you want to check
  CHANNEL_NAME = '#yourchannel' # name of the channel to announce to
  CHECK_EVERY  = 900 # number of seconds to check (15 minutes is default)
  MESSAGE      = "Page updated!" # message displayed before the URL when the announcement is made

  def help(plugin, topic="")
    return "Checks #{URL_CHECKED} regularly and tells the channel when its updated."
  end

  def initialize
    super
    @last_update = @bot.httputil.get(URL_CHECKED)
    @bot.timer.add(CHECK_EVERY) { check_page }
  end

  def check_page
    html = @bot.httputil.get(URL_CHECKED)
    if html != @last_update
      @bot.say CHANNEL_NAME, "#{MESSAGE} #{URL_CHECKED}"
      @last_update = html
    end
  end

end

plugin = CheckPagePlugin.new