图片压缩脚本

通过 tinypng 提供的 api 批量压缩工程中 xcassets 的图片。对于已压缩的图片，在图片的 exif 信息中添加 Comment 字段，防止重复压缩操作。

def isImageCompressed(path)
  require 'rmagick'
  image = Magick::Image.read(path).first
  result = image["Comment"] 
  return false if result.nil?
  result.include?("Compressed by tinypng")
end

def recordImageCompressed(path)
  require 'rmagick'
  image = Magick::Image.read(path).first
  commnet = image["Comment"].nil? ? "" : "#{image["Comment"]}\n"
  image["Comment"] = commnet + "Compressed by tinypng"
  image.write(path)
end

desc "压缩图片"
lane :compress_images do
  require "tinify"
  Dir.chdir ".."
  require "json"
  require "tinify"
  keys = ["key1", "key2", "key3"]
  Tinify.key = keys[0]

  puts "图片检索中..."
  exclude_dirs = ["Pods", "*.bundle"].map { |d| "./dealer/**/#{d}/**/*.{png,jpg}" }
  images = Dir.glob("./dealer/**/*.{png,jpg}")
  images -= Dir.glob(exclude_dirs)
  images = images.select { |image| !isImageCompressed(image) }
  puts "待压缩图片数量: #{images.count}"
  images.each_with_index { |f, i|
    puts "正在处理图片: #{f}"
    begin
      Tinify.from_file(f).to_file(f)
      recordImageCompressed(f)
      key_index = (i + 1) / 500
      if key_index < keys.count
        Tinify.key = keys[key_index]
      else
        puts "key 用完了, 快给我新 key  (●ﾟωﾟ●)"
        break
      end
    rescue => exception
      puts "😭 #{f} 压缩失败了，失败原因: #{exception}"
      break
    end
  }
end