amazon.co.jp stock check script

gistfile1.rb

# -*- coding: utf-8 -*-
require 'nokogiri'
require 'open-uri'
require 'kconv'

page = open "http://www.amazon.co.jp/exec/obidos/ASIN/4048860690/"
# page = open "http://www.amazon.co.jp/exec/obidos/ASIN/4774149942/"

html = Nokogiri::HTML(page.read, nil, 'Shift_JIS')
stock = html.search "//div[@class='buying']//span[@class='availGreen']"

if stock.inner_html.toutf8 == "在庫あり。"
  puts 'この商品の在庫はあります。'
else
  puts '売りきれ'
end