Thanks Valentin, I will definitely use it in my code.
But this API change leaves me a bit perplexed. It's the first one I've
encountered since LilyPond 2.19.84! For this reason I am crossposting
this message with the devel mailing list.
Why has forward compatibility not been ensured for this function?
Il sab 8 feb 2025, 17:42 Valentin Petzel <valen...@petzel.at> ha scritto:
> Hello Paolo,
>
> > Is there a way to make this snippet compatible with all LilyPond
> > versions starting from 2.19.84?
>
> You could do something like this
>
> ```
> requireVersion =
> #(define-scheme-function (version then else)
> (string? scheme? scheme?)
> (define (list< x y)
> (if (null? x)
> #f
> (cond ((< (car x) (car y)) #t)
> ((> (car x) (car y)) #f)
> (else (list< (cdr x) (cdr y))))))
> (let* ((split (string-split version #\.))
> (nversion (map string->number split))
> (tversion (ly:version)))
> (if (list< tversion nversion)
> else
> then)))
>
> {
> \set Score.proportionalNotationDuration = \requireVersion "2.25.23"
> #1/32
> #(ly:make-moment 1 32)
> c' c' c'
> }
> ```
>
> to set a different value depending on the Lilypond version.
>
> Cheers,
> Valentin
