jukebox.rb

require_relative './song_library.rb'

def jukebox(command)
  if command.downcase == "list"
    list_library
  else
    parse_command(command)
  end
end

def list_artist(artist, album_hash)
   artist_list = "\n---------------\n"
   artist_list += "#{artist}:\n"
   artist_list += "---------------"
   album_hash[:albums].each do |album_name, songs_array|
     artist_list += "\n#{album_name}:\n\t"
     artist_list += songs_array.join("\n\t")
   end
   artist_list
end

def list_library
  lib = full_library
  lib.each do |artist, album_hash|
    puts list_artist(artist, album_hash)
  end
end

def parse_command(command)
  parse_artist(command, full_library) || play_song(command, full_library) || not_found(command)
end

def parse_artist(command, lib)
  cmd = command.to_sym
  parsed = false
  if lib.has_key?(cmd)
    puts list_artist(command, lib[cmd])
    parsed = false
  else
    lib.each do |artist, hash|
      if command == artist.to_s.downcase
        puts list_artist(artist, hash)
        parsed = true
        break
      end
    end
  end
  parsed
end

def play_song(command, lib)
  lib.each do |artist, hash|
    hash.each do |album_name, albums_hash|
      albums_hash.each do |album, song_array|
        song_array.each do |song|
          if song.downcase == command
            puts "Now Playing: #{artist}: #{album} - #{song}\n"
            return true
          end
        end
      end
    end
  end
  false
end

def not_found(command)
  puts "I did not understand '#{command}'!\n\n"
  true
end

runner.rb

require_relative './jukebox.rb'

def run
  puts "Welcome to Ruby Console Jukebox!"
  puts "Enter a command to continue. Type 'help' for a list of commands."
  
  command = get_command

  while command.downcase != "exit" do  
    run_command(command) 
    puts "Enter a command to continue. Type 'help' for a list of commands.\n"
    command = get_command unless command == "exit"
  end
end

def get_command
  gets.strip.downcase
end

def run_command(command)
  case command
  when "help"
    show_help
  else
    jukebox(command)
  end
end

def show_help
  help = "Never worked a jukebox, eh? Pretty standard. Available commands are:\n"
  help += "'help' - shows this menu\n"
  help += "'list' - lists the whole song library\n"
  help += "or you can enter an artist's name to show that artist's songs\n"
  puts help
end

run

song_library.rb

def full_library
  {
    :"U2" => {
      :albums => {
        :"The Joshua Tree" => 
          ["With or Without You", "Still Haven't Found What I'm Looking For", "Bullet the Blue Sky"],
        :"Zooropa" => 
          ["Numb"]
        
      }
    },
    :"Talking Heads" => {
      :albums => {
        :"Fear of Music" => 
          ["Life During Wartime", "Heaven"],
        :"Speaking in Tongues" => 
          ["This Must Be the Place (Naive Melody)", "Burning Down the House"]
        
      }
    },
    :"Huey Lewis and the News" => {
      :albums => {
        :"Sports" => 
          ["I Want a New Drug", "If This is It", "Heart of Rock and Roll"]
      }
    }
  }
end