gistfile1.rb

#!/usr/bin/env ruby
require 'pp'
require 'spotify'
require 'io/console'

USERNAME='tliff'
PLAYLIST='spotify:user:1121758979:playlist:1ohNJvub3eoB86tKumCC7U'
CONFIG = Spotify::SessionConfig.new({
    api_version: Spotify::API_VERSION.to_i,
    application_key: File.binread(File.expand_path("~/.spotify/spotify_appkey.key")),
    cache_location: File.expand_path("~/.spotify/"),
    settings_location: File.expand_path("~/.spotify/"),
    user_agent: "spotify for ruby",
    callbacks: Spotify::SessionCallbacks.new
})
def prompt(message, default = nil)
  if default
    print "\n#{message} [#{default}]: "
    input = gets.chomp

    if input.empty?
      default
    else
      input
    end
  else
    print "\n#{message}: "
    gets.chomp
  end
end
def initialize_spotify!
  $session = FFI::MemoryPointer.new(Spotify::Session) do |ptr|
    Spotify.try(:session_create, CONFIG, ptr)
    break Spotify::Session.new(ptr.read_pointer)
  end

  remembered_user_length = Spotify.session_remembered_user($session, nil, 0)

  if remembered_user_length > 0
    username = FFI::MemoryPointer.new(:int, remembered_user_length + 1) do |username_ptr|
      Spotify.session_remembered_user($session, username_ptr, username_ptr.size)
      break username_ptr.read_string.force_encoding("UTF-8")
    end

    Spotify.try(:session_relogin, $session)
  else
    username = prompt("Spotify username, or Facebook e-mail")
    password = $stdin.noecho { prompt("Spotify password, or Facebook password") }

    Spotify.try(:session_login, $session, username, password, true, nil)
  end

  poll { Spotify.session_connectionstate($session) == :logged_in }
 # puts "a"
  at_exit do
    Spotify.session_logout($session)
    poll { Spotify.session_connectionstate($session) != :logged_in }
  end

end

def poll
  until yield
    #puts '.'
    process_events
    sleep(0.05)
  end
end

def process_events
  FFI::MemoryPointer.new(:int) do |ptr|
    Spotify.session_process_events($session, ptr)
  end
end

track_id=`osascript -e 'tell Application "Spotify" to get the spotify url of current track'`.strip
exit 1 unless track_id =~ /^spotify:track:\w+/

$session = nil
initialize_spotify!

user_link = "spotify:user:#{USERNAME}"
link = Spotify.link_create_from_string(user_link)

user = Spotify.link_as_user(link)
poll { Spotify.user_is_loaded(user) }


playlist_link = Spotify.link_create_from_string(PLAYLIST)
playlist = Spotify.playlist_create($session, playlist_link)
poll { Spotify.playlist_is_loaded(playlist) }

track_link = Spotify.link_create_from_string(track_id)
track = Spotify.link_as_track(track_link)
poll { Spotify.track_is_loaded(track) }

tracks = [track]
tracks_pointer = FFI::MemoryPointer.new(Spotify::Track, tracks.length)
tracks_pointer.write_array_of_pointer(tracks)
Spotify.playlist_add_tracks(playlist, tracks_pointer, tracks.length, Spotify.playlist_num_tracks(playlist), $session)

sleep 1