Ruby course RSS scapper mail

scapper2.rb

require 'open-uri'
require 'nokogiri'
require 'pony'
#sudo gem install pony

module Course
  class RSSSource
    attr_accessor :url
    attr_accessor :xml

    def initialize(url)
      self.url = url
      self
    end

    def fetch!
      f = open(url)
      self.xml = Nokogiri::XML(f.read)
    end

    def titles
      []
    end
  end

  class PlanetFedora < RSSSource
    def initialize
      super('http://planet.fedoraproject.org/rss20.xml')
      @old_titles = []
      self
    end

    def titles
      titles_arr = []
      self.xml.xpath('/rss/channel/item/title').each do |t|
        next if @old_titles.include? t.text
        yield t.text if block_given?
        titles_arr << t.text
        @old_titles << t.text
      end
      titles_arr
    end

  end
end

planet = Course::PlanetFedora.new

loop do
  planet.fetch!
  last_article = planet.titles.first
  Pony.mail(
    :from => 'mi@mifo.sk',
    :to => 'mi@mifo.sk', 
    :subject => last_article
  ) unless last_article.nil?
  sleep(5)
end