encode files with the data-uri scheme using base64

data-uri.rb

#!/usr/bin/env ruby

require 'base64'
require 'rack/mime'

if ARGV.empty?
  puts "usage: #{File.basename($0)} [glob ...]"
  exit 0
end

Dir[*ARGV].each do |path|
  code = Base64.strict_encode64(File.read(path))
  mime = Rack::Mime.mime_type(File.extname(path))
  puts "#{path}: data:#{mime};base64,#{code}"
end