Rake task to find unused images on Rails project to deletion.

find_unused_images.rake

# It requires ACK - http://betterthangrep.com/
task :find_unused_images do
  images = Dir.glob('app/sources/images/**/*')

  images_to_delete = []
  filelist = `cd .. && ack -g -i '(my-app/app|my-app/public|my-gem/app)'`
  images.each do |image|
    unless File.directory?(image)
      # print "\nChecking #{image}..."
      print "."
      result = `cd .. && echo "#{filelist}" | ack -x -w #{File.basename(image)}`
      # print "Found: #{result}" unless result.empty?
      if result.empty?
        images_to_delete << image
      else
      end
    end
  end
  puts "\n\nDelete unused files running the command below:"
  puts "rm #{images_to_delete.join(" ")}"
end