TinyPNG script

tinypng.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'bundler/setup'

require 'dotenv'
Dotenv.load

require 'tinify'
require 'json'

Tinify.key = ENV['TINYPNG_API_KEY']

JSON_STORE = 'tinied.json'

tinied = File.exist?(JSON_STORE) ? JSON.load(File.read(JSON_STORE)) : []

ARGV.each do |path|
  if tinied.include?(path)
    puts "Already shrunk #{path}"
  else
    puts "Shrinking #{path}"
    size_before = File.size(path)
    source = Tinify.from_file(path)
    source.to_file(path)
    size_after = File.size(path)
    tinied << path
    puts "Shrunk from #{size_before} bytes to #{size_after} bytes (#{(100.0 * size_after / size_before).round(2)}%)"
  end
end

File.open(JSON_STORE, 'w') { |f| f << tinied.to_json }