Update Ubuntu wallpaper based on Tweet content

class Wallpaper
  # This sets the specified image as the wallpaper and, by default, tiles it. Use
  #   $ gsettings range org.gnome.desktop.background picture-options
  # to see other options for centring/stretching the image. You can also specify a different source directory
  def self.update(filename,display="wallpaper",dir="file:///path/to/wallpaper")
    `gsettings set org.gnome.desktop.background picture-uri #{dir}/#{filename} && gsettings set org.gnome.desktop.background picture-options "#{display}"`
  end
end

# This is where the fun bit starts
require "rubygems"
require "twitter" # https://github.com/sferik/twitter

# Visit http://apps.twitter.com to set up your API keys
client = Twitter::Streaming::Client.new do |config|
  config.consumer_key        = "YOUR_CONSUMER_KEY"
  config.consumer_secret     = "YOUR_CONSUMER_SECRET"
  config.access_token        = "YOUR_ACCESS_TOKEN"
  config.access_token_secret = "YOUR_ACCESS_SECRET"
end

users = ["19455489"] # Just Matt, for the purposes of this script
attempts = 0

begin
  attempts = 1
  # Get the live stream for the relevant users
  client.filter(follow: users.join(",")) do |object|
    # We only care about tweets
    if object.is_a?(Twitter::Tweet)
      # This is so we don't trigger on replies/mentions etc.
      if object.user.screen_name.downcase == "jam_sponge"
        # Now we want to make sure this is one of the trigger phrases
        if object.text.include?("GOOD MORNING")
          Wallpaper.update("morning.png")
        elsif object.text.include?("GOOD NIGHT")
          Wallpaper.update("night.jpg")
        end
      end
    end
  end
rescue Twitter::Error::TooManyRequests => error
  puts "#{Time.now.strftime("%H:%M:%S")} -- Attempt #{attempts} failed"
  if attempts % 3 == 0
    puts "#{Time.now.strftime("%H:%M:%S")} -- Waiting 15 minutes..."
    sleep(15*60)
  end
  retry
end