thumbnails-dl.rb

require "json"
require "open-uri"
require "fileutils"

@hash

File.open("youtube-list.json") do |j|
    @hash = JSON.load(j)
end

# thumbnails という名前のディレクトリを作る処理をかけ
FileUtils.mkdir_p("thumbnails") unless File.exist?("thumbnails")

@hash.each_with_index do |data, i|
    File.open("thumbnails/#{i}-#{data["published_at"]}.jpg", "wb") do |file|
        open(data["thumbnails"]) do |img|
            file.puts img.read
        end
    end
end