require 'rubygems'
require 'open-uri'
require 'nokogiri'
require 'fileutils'

FileUtils.mkdir_p 'downloads/'

def podcasts
  feed = 'http://s.ch9.ms/Shows/Azure-Friday/feed/mp4high'
  Nokogiri::XML(open(feed)).xpath('//item')
end

podcasts.each do |podcast|
  source      = podcast.at('enclosure')['url'].to_s
  name        = source.split('/').last
  local_file  = "downloads/#{name}"

  next if File.exist? local_file

  File.open(local_file, "wb") do |file|
    puts " downloading " + name
    file.write open(source).read
  end
end