Embed all images directly in HTML file (OS X)

embed.rb

require 'base64'
require 'fileutils'

img = /img src="(.*)" /

File.open("#{ARGV[0]}.html") do |i|
  File.open("#{ARGV[0]}-embedded.html", 'w') do |o|
    i.each_line do |l|
      if match = img.match(l)
        location = match[1]
        basename = File.basename(location)

        FileUtils.cp(location, '.')
        `sips -Z 1280 #{basename}`
        
        image = File.open(basename, 'rb') do |f|
          f.read
        end

        l.sub!(img, "img src=\"data:image/png;base64,#{Base64.strict_encode64(image)}\" ")
      end

      o.puts l
    end
  end
end