Script for creating a playlist Chapter 11 exercises

playlist_maker.rb

Dir.chdir #add your music directory here
all_music = (Dir['**/*.mp3'].shuffle)
puts "what do you want to name your playlist?"
answer = gets.chomp

File.open "#{answer}.m3u",'w' do |file|
  all_music.each do |mp3_file_name|
    file.write "#{mp3_file_name}\n"
  end
end
puts  "Wrote #{all_music.size} entries"

I tend to write most of these utilities by supplying the options on the command line rather than having "Where do you want X?" prompts and input capture in the app. It follows the "unix model" where you supply options on the command line and only output data to STDOUT that would be useful output to the user or to another program that would consume it (via pipes)

For example:

randomize_amazon_playlist /path/to/mp3folder /path/to/output_playlist.m3u

Or better yet to use a command line parser:

randomize_amazon_playlist --playlist /path/to/output_playlist.m3u -- mp3_folder /path/to/mp3folder

• Notice I changed the order because with the --option style you are now free from order dependency.