Re: Export from LilyPond to MusicXML (Thomas Morley)

[Thomas Morley]

Am Do., 7. Okt. 2021 um 11:30 Uhr schrieb Peter Toye <lilypond@ptoye.com>:
>
> The potential need has gone away now - my Sibelius user has told me that he 
> uses ScoreMuse to export the PDF into a suitable format for Sibelius. Looks 
> to me like an expensive way of doing it, but if he can afford Sibelius he can 
> probably afford ScoreMuse as well.
>
>
>
> I agree that exchanging music information between different engravers is an 
> extremely complex problem and I don't underestimate the difficulty.
>
>
>
> I tried Jan-Peter's code on Github, but it seems to be broken on recent 
> versions of LilyPond. I'm told it works on 19.0  but I don't have that 
> version any more. And I don't have a contact for him to ask - is he on this 
> mailing list?

Not sure Jan-Peter's approach is the best method ...
Anyway, applying the following diff makes it work with recent versions
(although you'll get a bunch of messages):

~/openlilylib/lilypond-export (master)$ git diff
diff --git a/api.scm b/api.scm
index 8307dc5..3bfa69a 100644
--- a/api.scm
+++ b/api.scm
@@ -275,8 +275,8 @@
          (let ((musicstep (ly:context-property context ctprop::export-step))
                (staff-id (ly:context-property context ctprop::staff-id))
                (voice-id (ly:context-property context ctprop::voice-id)))
-           (ly:message "stem info ~A" (map car (ly:grob-properties grob)))
-           (tree-set! musicstep `(,staff-id ,voice-id stem dir)
(ly:grob-properties grob)) ;(ly:stem::calc-direction grob))
+           (ly:message "stem info ~A" (map car
(ly:grob-basic-properties grob)))
+           (tree-set! musicstep `(,staff-id ,voice-id stem dir)
(ly:grob-basic-properties grob)) ;(ly:stem::calc-direction grob))
            ))
         )


Cheers,
  Harm