Talking Reddit Watchdog

talking_reddit.rb

require 'restclient'
require 'json'

subreddits = {
  'minimalism'  => 'http://www.reddit.com/r/minimalism.json?sort=new',
  'programming' => 'http://www.reddit.com/r/programming.json?sort=top&t=day',
  'lifeprotips' => 'http://www.reddit.com/r/lifeprotips.json?sort=new',
  'ruby'        => 'http://www.reddit.com/r/ruby.json?sort=new',
  'linux'       => 'http://www.reddit.com/r/linux.json?sort=new',
  'netsec'      => 'http://www.reddit.com/r/netsec.json?sort=new',
  #'pics'        => 'http://www.reddit.com/r/pics.json?sort=new',
}

def speak(text, lang='en')
  tmp_file = '/tmp/google_tts.mp3'
  File.open(tmp_file, 'w') do |f|
    f.write RestClient.get("http://translate.google.com/translate_tts?tl=#{lang}&q=#{URI.encode(text)}")
  end
  `mpg123 -q #{tmp_file}`
end

at_exit do
  unless $!.is_a?(Interrupt)
    speak "Oh no! I'm dying! The reason is: #{$!.message}" 
  end
end

known_posts = Hash[subreddits.keys.zip(Array.new(subreddits.size){{}})]

while true
  subreddits.each do |subreddit, url|
    data = JSON.parse(RestClient.get(url))['data']['children'].map{|e| e['data']}
    posts = Hash[data.map{|e| e['id']}.zip(data)]
    new_keys = posts.keys - known_posts[subreddit].keys
    new_posts = posts.select{|k,v| new_keys.include?(k)}
    puts "#{Time.now} - #{subreddit} - #{new_posts.size} new posts"
    if !known_posts[subreddit].empty? && !new_posts.empty?
      new_posts.each{|k,v| puts "#{v['title']} - #{v['domain']}"}
      speak "I found #{new_posts.count} new post#{new_posts.count==1 ? '':'s'} in #{subreddit}."
      new_posts.values.sort{|a,b| a['created']<=>b['created']}.each_with_index do |post, i|
        number = new_posts.size > 1 ? "Number #{i+1}: " : ''
        domain = post['is_self'] ? '' : ". Domain: #{post['domain']}"
        speak "#{number}#{post['title']}#{domain}"
      end
    end
    known_posts[subreddit].merge!(new_posts)
  end
  sleep 120
end