Get currently playing song/artist in Google Play

safari-google-song.osa

#!/usr/bin/osascript
#
# Usage ./safari-google-song.osa [tab url]
#
# Example: ./safari-google-song.osa play.google.com
# Example: ./safari-google-song.osa spotify.com

on replace_chars(this_text, search_string, replacement_string)
 set AppleScript's text item delimiters to the search_string
 set the item_list to every text item of this_text
 set AppleScript's text item delimiters to the replacement_string
 set this_text to the item_list as string
 set AppleScript's text item delimiters to ""
 return this_text
end replace_chars

on run argv
  if (count of argv) > 0 then
    set _url to (item 1 of argv)
  else
    set _url to "play.google.com"
  end if

  tell application "Safari"
    set tabsList to front window's tabs as list
    set tabsInfo to {}
    repeat with currTab in tabsList
      set currHost to do Javascript "window.location.host" in currTab
      if (currHost = _url) then set raw_title to do Javascript "document.title" in currTab
    end repeat
  end tell

  try
    set song to replace_chars(raw_title, " - Google Play Music", "")
    log ("♪ " & song & " ♫")
  on error
    log "There's no song playing"
  end try

end run