my itunes cli

itunescli.rb

#!/usr/bin/env ruby
require 'kconv'
require 'rubygems'
require 'rbosa'

class ItunesCLI

  COMMANDS = {
    'next'      => :next_track,
    'n'         => :next_track,
    'prev'      => :back_track,
    'back'      => :back_track,
    'b'         => :back_track,
    'pause'     => :pause,
    'play'      => :play,
    'playpause' => :playpause,
    'p'         => :playpause,
    'stop'      => :stop,
    'track'     => :current_track,
    't'         => :current_track,
  }

  def initialize
    @app = OSA.app('iTunes')
  end

  def run(argv)
    key = argv.empty? ? nil : argv.shift
    unless COMMANDS.keys.include? key
      puts usage
      exit
    end
    cmd = COMMANDS[key]
    @app.send(cmd) if cmd != :current_track
    puts track_info
  end

  def track_info
    track = @app.current_track
    str   = "%s - %s / %s" % [track.name, track.album, track.artist]
    str.toutf8
  end

  def usage
    keys = COMMANDS.keys.sort_by{|e| e.to_s}
    str =  "Usage: itunes [command]\n"
    str << "commands:\n"
    keys.each{|k|
      str << "  %-10s ... %s\n" % [ k, COMMANDS[k] ]
    }
    str
  end

end

ItunesCLI.new.run(ARGV) if __FILE__ == $0