Ruby course RSS scapper

course.rb

require 'open-uri'
require 'nokogiri'

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
      self.xml.xpath('/rss/channel/item/title').each do |t|
        next if @old_titles.include? t.text
        yield t.text
        @old_titles << t.text
      end
    end

  end
end

planet = Course::PlanetFedora.new

loop do
  planet.fetch!
  planet.titles do |title|
    puts title
  end
  sleep(5)
  puts "Fetching new titles..."
end

=begin
old_titles = []

loop do
  f = open("http://planet.fedoraproject.org/rss20.xml")
  feed = Nokogiri::XML(f.read)
  old_title_size = old_titles.size
  feed.xpath("/rss/channel/item/title").each do |title|
    next if old_titles.include? title.text
    puts title.text
    old_titles << title.text
  end
  puts "No change..." if old_title_size == old_titles.size
  sleep(5)
end
=end