Time signature and event-listener

[Karim Haddad]

Hi 

Did somebody knows or succeeded in retrieving (outputting) the Time signatures 
using the event-listener.ly ?

I tried this :

#(define (format-measure engraver event)
   (print-line engraver
               "timesig"    
               (list (ly:event-property event 'numerator )
                   (ly:event-property event 'denominator ))))          

but don't seem to find any event accepting it. It seems there's no event that 
interacts with the time signature. (timeSignature Engraver ???)
In this case, re there anyways to retrieve this info specially if thee are 
TimeSignature changes?

I only succeeded in using music-event but this is not working since it prints 
out each event (not on time signature calls) and outputs :

Unsupported SCM value for format: ()



Thank you

Karim