Real-time meta data from Icecast using LiquidSoap (reprise)

I found a bug in my script. It pops up when there's an apostrophe or a paren in the song title. Below, I've modified the script slightly to fix this issue. Also, I've changed the external program call so that it uses notify-send to pop up the song title on my desktop.

set("log.file",false) set("log.stdout",false) set("log.level",3)def apply_metadata(m) = title = m["title"] #print("Now playing: #{title}") system("notify-send #{quote(title)}") endradio = input.http( user_agent="joats/kludged-up-script", timeout=30., poll_delay=.5, new_track_on_metadata=true, force_mime="audio/mpeg", buffer=.5, id="original", "http://music.joat:8000/airtime_128" ) radio = on_metadata(apply_metadata,radio) output.dummy(fallible=true,radio)

For those that can't see it, the changes are all in the line starting with "system".