gistfile1.rb

require 'net/http'
require 'nokogiri'

def scrape
  uri = URI('http://www.reddit.com/')
  page = Net::HTTP.get(uri)

  document = Nokogiri::HTML(page)

  data = {}
  document.css('#siteTable .thing').each do |story_el|
     title_el = story_el.css(".title a").first

     title = title_el.content
     score = story_el.css(".score.unvoted").first.content.to_i
     link = title_el[:href]

     data[title] = { title: title, link: link, score: score }
  end
  data
end

# scrape.each do |id, entry|
#   puts entry[:title]
#   puts entry[:link]
#   puts "Score: #{entry[:score]} points"
#   puts
# end

old_state = scrape
loop do
  state = scrape
  staying_stories = old_state.keys & state.keys
  staying_stories.each do |title|
    if state[title][:score] != old_state[title][:score]
      puts "#{title} score: #{old_state[title][:score]} -> #{state[title][:score]}"
    end
  end

  new_stories = state.keys - old_state.keys
  new_stories.each do |title|
    puts "New: #{title} on frontpage with #{state[title][:score]}"
  end

  gone_stories = old_state.keys - state.keys
  gone_stories.each do |title|
    puts "#{title} gone from frontpage :( – had #{old_state[title][:score]} points"
  end

  sleep 5
  old_state = state
end