Merge_rss.rb

#!/usr/pkg/bin/ruby

require 'rss'
require 'uri'
require 'open-uri'

class RSS_Merge

  def initialize(url_arr)
    @contents = load(url_arr)
  end

  def load(url_arr)
    url_arr.map do |uri|
      parse(open(URI.encode(uri)))
    end
  end

  def parse(content)
      RSS::Parser::parse(content)
    rescue RSS::InvalidRSSError
      RSS::Parser::parse(content, false)
  end

  def merge_rss
    RSS::Maker.make("2.0") do |maker|
      maker.channel.about = "udonchan's rss"
      maker.channel.title = "udonchan"
      maker.channel.description = "udonchan's rss"
      maker.channel.link = 'http://udonchan.org/~udonchan/'
      maker.items.do_sort = true 

      @contents.each do |c|
        c.items.each do |i|
          i.setup_maker(maker)
        end
      end

    end
  end

end

print "Content-type: application/xml\n"
print "Pragma: no-cache\n"
print "Cache-Control: no-cache\n"
print "Expires: #{Time.now} \n\n"

puts RSS_Merge.new(['http://d.hatena.ne.jp/UDONCHAN/rss2', 
                    'http://roadbike.g.hatena.ne.jp/UDONCHAN/rss2',
                    'http://gist.github.com/udonchan.atom']).merge_rss