#! /usr/bin/ruby

# Read RSS feed for computer books at Amazon



# Define as a method so it can be pasted into libraries later

def amazon_rss



	# Open the RSS file 

	require 'open-uri'



	uri = "http://xml.amazon.com/onca/xml3?mode=books&bcm=Books%3A%20Computers%20%26%20Internet" +

		"&t=webservices-20&dev-t=amznRss&type=lite&page=1&ct=text/xml&sort=+salesrank" +

		"&f=http://xml.amazon.com/xsl/xml-rss091.xsl&BrowseNodeSearch=5"



	rssfeed = open(uri) 

	

	# Use the built-in REXML module

	require "rexml/document"

	include REXML

	

	# Parse the RSS feed

	rssdoc = Document.new rssfeed.read



	# Create a list of each book and its URL

	result = "<strong>Current items in Amazon's <a href=#{uri}>Computer Book RSS feed</a>:</strong><ul>"

	rssdoc.elements.each("rss/channel/item") do |item| 

		title = item.elements["title"].text

		link = item.elements["link"].text

		result += "<li><a href='" + link + "'>" + title + "</a>"

	end

	

	return result + "</ul>"

end