crush.rb

#!/usr/bin/env ruby -W0
# Crush!
# Crushes png and jpg images by removing their headers and usually unnessecary data for the web.
# Needs pngcrush and jpegtran.
#
# Usage:
#   $ crush directory/to/copy new/directory
#
# Installing pngcrush and jpegtran under OS X:
#   $ sudo port install pngcrush
#
#   $ cd /tmp
#   $ curl http://txfx.net/files/osx/automatic-lossless-jpg-rotation-for-os-x.zip > jhead-jpegtran.zip
#   $ unzip jhead-jpegtran.zip
#   $ sudo cp Automatic\ Lossless\ Photo\ Rotation/jpegtran /usr/bin/
#   $ rm -fr jhead-jpegtran.zip Automatic\ Lossless\ Photo\ Rotation
#
# Author: Sunny Ripert <sunfox.org>
# Licence: WTFPL

require 'fileutils'
require 'tempfile'
include FileUtils

# Find directories in which to work
dir = ARGV[0]
abort "Usage: #{File.basename($0)} dir" if dir.nil?

# Find all files
files = []
cd(dir) do
  search = File.join('**', '*')
  files = Dir[search]
end

abort "No files found in #{dir}" if files.empty?

tmp_file = Tempfile.new('current_image').path

files.each do |file|
  old_file = File.expand_path(File.join(dir, file))
  next if File.directory?(old_file)

  case file
    when /\.png$/
      # Try pngcrush
      `pngcrush '#{old_file}' '#{tmp_file}'`
      if $?.exitstatus == 0
        cp tmp_file, old_file
        next
      end

      # Try optipng
      `optipng '#{old_file}'`

    when /\.jpe?g$/
      # Try jpegtran
      #`jpegtran -copy none -optimize -perfect #{file} #{tmp_file}`
      `jpegtran -copy none -optimize '#{old_file}' > '#{tmp_file}'`
      cp tmp_file, old_file if $?.exitstatus != 0

 end
end