now_playing.rb

#!/usr/bin/env ruby

require 'shellwords'

FIELDS = %w(artist album name duration spotify\ url).map { |x| "#{x} of current track" }.join(' & "\\n" & ')

SCRIPT =<<EOF
tell application "Spotify"
  #{FIELDS}
end tell
EOF

COMMAND = Shellwords.shelljoin(["osascript", "-e", SCRIPT])

artist, album, track, duration, uri = `#{COMMAND}`.strip.split("\n")
duration = (duration.to_i / 1000).divmod(60)

formatted = format(
  "%s - %s (%d:%02d) %s",
  artist,
  track,
  duration[0],
  duration[1],
  uri.sub(/^spotify:track:/, "https://open.spotify.com/track/")
)

puts formatted

IO.popen('pbcopy', 'w') do |io|
  io.write formatted
end