task to time stamp images in css

timestamp_css_image

task :timestamp do
  file_list.each do |file_name|  
    file_path = "#{RAILS_ROOT}/public/stylesheets/"+file_name
    file = File.new(file_path)
    temp_file_path = "#{RAILS_ROOT}/public/stylesheets/"+file_name+"_1"
    temp_file = File.new(temp_file_path, File::CREAT|File::TRUNC|File::RDWR, 0644)

    file.readlines.map {|line|
      line = line.gsub(/\.(ico|gif|jpe?g|png)/) {|s| s+'?'+rand(1000000000000)}
      temp_file.write line
    }
    file.close
    File.delete(file_path)
    temp_file.close
    File.rename(temp_file_path, file_path)
  end
end