sort.rb

    # Sort messages in this folder
    #
    # Example:
    #   Before Sort: msg0002, msg0005, msg0010, msg0020
    #   After Sort:  msg0000, msg0001, msg0002, msg0003
    def sort!
      temp = []
      messages.each_with_index do |message, index|
        # message.files is an array of files [msg0000.{txt,wav}]
        message.files.each do |file|
          ext = File.extname(file)
          filename = "#{@path}/temp_msg%04d#{ext}" % index
          temp << filename
          File.rename(file, filename)
        end
      end

      temp.each do |t|
        filename = t.sub('temp_msg', 'msg')
        File.rename(t, filename)
      end
    end