Save web image as wallpaper

web_image.rb

#/usr/bin/env ruby
require 'nokogiri'
require 'open-uri'

doc = Nokogiri::HTML(open('https://medium.com'))
urls = doc.at_css('.cover-img')["style"].scan(/\('([^\)]*)'\)/)
image_src = 'http:'+urls[0][0]
ext = image_src.split('.').last
random = rand(2**256).to_s(36)[0..7]
download_path = "/tmp/#{random}.#{ext}"

puts "downloading: #{image_src} to #{download_path}\n" 

`wget -O #{download_path} #{image_src}`
`osascript -e 'tell application "System Events" to set picture of every desktop to "#{download_path}"'`