gistfile1.rb

class SoxEncoder
  
  attr_accessor :input_files, :output_file, :command_line

  def initialize
    @input_files = []
  end
  
  def input_file=(filename)
    @input_files << filename
  end
  
  def convert
    if @input_files.length > 0
      @command_line = "sox #{@input_files.join(' ')} #{@output_file}"
    else
      raise ArgumentError, "No input file specified."
    end
    return run_command
  end
  
  def run_command
    raise ArgumentError, "No output file specified." unless @output_file
    puts @command_line
    if system @command_line
      return true
    else
      return false
    end
  end
  
end