A Gravatar Downloader

grav.rb

#!/usr/bin/env ruby

require 'digest/md5'
require 'net/http'

class String
  def user_hash
    Digest::MD5.hexdigest self.downcase
  end
end

def url email
  "/avatar/#{email.user_hash}"
end

Net::HTTP.start("www.gravatar.com") do |http|
  resp = http.get(url(ARGV.first))
  open("avatar.png", "wb") do |file|
    file.write(resp.body)
  end
end

puts "Downloaded! => avatar.png"