Hi all,
I'm looking at my
Event listener to extract (some) music events
http://codereview.appspot.com/4373046/
patch. Neil and Han-Wen suggested that I avoid the music
typesetting process and hook into the even listener directly.
However, I'm confused/concerned about getting the text value of
text spanners. I'm currently doing:
#(define (format-textspan engraver event)
(let* ((context (ly:translator-context engraver))
(moment (ly:context-current-moment context))
(spanner-props (ly:context-property context TextSpanner))
(details (chain-assoc-get 'bound-details spanner-props))
(left-props (assoc-get 'left details '()))
(left-text (assoc-get 'text left-props '())))
(print-line engraver
"set_string"
(ly:event-property event 'span-direction)
left-text)))
which uses the engraver. I couldn't see any event-specific way to
get the text of a text spanner -- the information appears to exist
on the engraver level only.
Am I missing anything obvious?
If I'm not missing anything, then I think it would be cleaner in
the long run just to leave everything as it is (i.e. after the
whole typesetting process -- IMHO this would also make it easier
for other researchers to modify the script, since they could get
whatever engraver properties they wanted to get).
Cheers,
- Graham
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