本の名前を入力するとamazonのurlが表示されるrubyスクリプト

get_amazonurl_from_bookname.rb

# -*- encoding: utf-8 -*-
require 'rubygems'
require 'mechanize' #gem install mechanize
require 'uri'
 
def item2url(item)
   item = item.split("(").first
   item = item.split("/").first
 
   item_escape = URI.escape(item)
   url="http://www.amazon.co.jp/s/field-keywords=#{item_escape}"
 
   agent = Mechanize.new
 
   agent.user_agent_alias = 'Windows IE 7'
 
   page = agent.get(url)
      
   url_sell = page.search("h3.newaps").css("a")[0][:href]
    
   id = url_sell.split("/").select{|x|/^\d+$/.match(x)}.first

   return "http://www.amazon.co.jp/dp/#{id}/?tag=hougi-22"

end

while gets
   item = $_.chomp
   begin 
      puts item2url(item)   
   rescue
      puts "cannot find #{item}"
   end
end