gistfile1.rbx

require 'rubygems'
require 'sinatra'
require 'hpricot'
require 'open-uri'

helpers do
  def episodes_form
    body = '<form method="post" action="/"><select name="link">'

    doc = Hpricot(open("http://podcast.rubyonrails.pro.br/"))
    (doc/'div.sub').each do |sub|
      a = sub.next_sibling.search('a').last
      if a
        (sub/'h1').each do |h1|
          number = h1.children[0].inner_text
          puts number.to_s
          if number[0] == 35 # igual a #
            body << '<option value="' + a[:href] + '">Episódio ' + number + ' - ' + h1.children[2].inner_text + '</option>'
          end
        end
      end
    end
    body << '</select><button>Ok</button></form>'
  end
end

get '/' do
  episodes_form
end

post '/' do
  body = episodes_form

  doc = Hpricot(open("http://podcast.rubyonrails.pro.br#{params[:link]}"))
  body << (doc/'div.content ul').last.to_html
end