download gif animations from kksg.net

gifs.rb

require 'fileutils'
require 'open-uri'
require 'json'

DIRNAME = File.join(File.dirname(File.expand_path(__FILE__)), 'gifs')
Dir.mkdir(DIRNAME) unless File.exists?(DIRNAME)

gifs = JSON.parse(open('http://kksg.net/api/gifs.json').read)
gifs.map{|gif| gif["md5"]}.each {|md5|
  url = "http://kksg.net/data/gif/#{md5}"
  filename = File.join(DIRNAME, "#{md5}.gif")
  
  if File.exists?(filename)
    puts "already downloaded #{url}"
  else
    puts "Download #{url}"
    gif = open(url)
    FileUtils.mv(gif.path, filename)
  end
}