playo.rb

require 'http'
require 'colored'
require 'nokogiri'

$url = 'http://playo.ru/goods/241/#.Ur8zaWRdVmg'
$run = '/Applications/VLC.app/Contents/MacOS/VLC /Users/bugagazavr/Downloads/1.mp3'
$start_price = 695

def get
  res = HTTP.get($url).response
  if res.code == 200
    doc = Nokogiri::HTML(res.body)
    p = doc.css('div#game_main_price span').text.to_i
    if p != $start_price
      puts 'SWAG'.green
      Kernel.exec($run)
    else
      puts 'NOTHING'.blue
    end
  else
    puts 'FAILED'.red
  end
end

while true do
  get
  sleep(30)
end