Quick hack to recompress epub files

epub_compressor.rb

def compress(file)
  raise unless system("rm -rf tmp/")
  raise unless system("unzip -q -o -d tmp/ '#{file}'")
  raise unless system("imageOptim --directory tmp/ ")
  raise unless system("pushd tmp/ && zip -q -9 -rX '#{file}' 'mimetype' '*' && popd")
end

def filesize(file)
  '%.2f' % (File.size(file).to_f / 2**20)
end

if File.directory?(ARGV[0])
  inputs = Dir[File.join(ARGV[0], '/**/*.epub')]
  inputs.each do |file|
    puts "Working on #{file}: #{filesize(file)} MB"
    compress(file)
    puts "Done with #{file}: #{filesize(file)} MB"
  end
else
  compress(ARGV[0])
end