Niols <ni...@niols.fr> writes: > Hello again,
[...] > I have not managed to override the "\repeat" music function. It isn't a music function but a "reserved" word in LilyPond. > I suspect there is something I do not understand in the order in which > things are executed in LilyPond. > > I have however found a solution based on overriding "make-music". I > replace "make-music" by a wrapper around it that adds the callback > from the snippet to all 'VoltaRepeatedMusic and leaves the rest > alone. This is actually just a few lines: > > #(define the-make-music make-music) > > #(define (make-music-wrapped name . music-properties) > (let ((music (apply the-make-music (cons name music-properties)))) > (if (equal? name 'VoltaRepeatedMusic) > (ly:music-set-property! music 'elements-callback new-volta-set)) > music)) > > #(set! make-music make-music-wrapped) > > It might not be the cleanest, but that is all I have, and that seems > to work. It would be easier to do music-descriptions.VoltaRepeatedMusic.elements-callback = ... A cursory glance would suggest that might work (though its effect would not be limited to one session). You could also try to redefine the make-volta-set function. >> 2. Maybe there is a way to define a function that will be ran before >> processing on any music? But this I have no idea if this is >> possible, or how to do it, and my research has proven ineffective so >> far. There are the scorification hooks. >> 3. Maybe there is a way to override the "make-volta-set" callback >> instead of creating a new one? Such that then, in LilyPond's normal >> execution, it uses the new definition and not and old one that then >> needs to be replaced? > > For 2. and 3., I still have no idea as this is far beyond my > understanding of the internals of LilyPond. I am not really looking > into it though. Not a matter of internals. #(define original-make-volta-set make-volta-set) (define (make-volta-set ...) ...) Possibly (set! make-volta-set (lambda (...) ...)) but I think that the define probably works. > > Thank you for your help; have a great Summer! > — Niols > > -- David Kastrup
