Wallpaper downloader for Ubuntu to the last Macanudo comics from the website http://www.macanudo.com.ar. Tested in Ubuntu 13.04. Run with --help to see some more options.

macanudo_del_dia.rb

#!/usr/bin/env ruby


require 'open-uri'
require 'nokogiri'
require 'RMagick'

include Nokogiri
include Magick

def latest_comic
  day=Date.today
  dom=nil
  today_str=nil

  loop do
    today_str=day.strftime("%Y-%m-%d")
    url="http://www.macanudo.com.ar/#{today_str}"
    dom=Nokogiri.parse(open(url))

    break if dom.css('.nohaymacanudo')
    day=day - 1
  end
  
  build_wallpaper(dom, today_str)
end

def random_comic
  first_date=Date.new(2008,06,28)
  delta_days=(Date.today-first_date).to_i

  day_str=nil
  dom=nil
  loop do
    day=first_date + Random.rand(delta_days)
    day_str=day.strftime("%Y-%m-%d")
    url="http://www.macanudo.com.ar/#{day_str}"
    dom=Nokogiri.parse(open(url))

    break if dom.css('.nohaymacanudo')
  end

  puts "Setting wallpaper to macanudo from #{day_str}"
  build_wallpaper(dom, day_str)
end

def from_date date
  url="http://www.macanudo.com.ar/#{date}"
  dom=Nokogiri.parse(open(url))

  if dom.css('.nohaymacanudo')
    puts 'There is no comic for this date :('
    exit 1
  end

end

def build_wallpaper dom, today_str
  comic_src=dom.css('td[colspan~=\'2\']>img')[0]['src']
  header_src=dom.css('a>img')[0]['src']

  comic=ImageList.new(comic_src)
  header=ImageList.new(header_src)

  # get first screen size
  scrx, scry = `xrandr`.scan(/connected (\d+)x(\d+)\+0\+0/).flatten.map{|s|s.to_i}

  # compose wallpaper
  wallpaper=ImageList.new
  wallpaper.new_image(scrx, scry){ self.background_color = "white" }
  wallpaper.composite!(comic, Magick::CenterGravity,Magick::AtopCompositeOp)
  wallpaper.composite!(header, Magick::SouthEastGravity,Magick::AtopCompositeOp)

  FileUtils.mkdir_p File.expand_path('~/.macanudos')
  filename=File.expand_path("~/.macanudos/#{today_str}.png")
  wallpaper.write filename
  system("gsettings set org.gnome.desktop.background picture-uri 'file://#{filename}'")
end


require 'trollop'
opts = Trollop::options do
  opt :random, "Random image"
  opt :date, "Image from date (format: YYYY-MM-DD)", :type => :string
end

if opts[:random]
  random_comic
elsif opts[:date]
  from_date opts[:date]
else
  latest_comic
end