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Re: Ottava printing at beginning of system

From: Thomas Morley
Subject: Re: Ottava printing at beginning of system
Date: Tue, 30 Nov 2021 00:16:22 +0100

Am Mo., 29. Nov. 2021 um 22:49 Uhr schrieb Valentin Petzel <>:
> Basically grob.after-line-breaking is a function that get’s called on grob
> after line breaks are determined and allows us to do tweaks related to line-
> breaking. So what this function does is:
> If the ottava bracket is broken we check if the grob is a broken part. This is
> done by getting all broken parts (the siblings) and checking if grob is the
> first of these (implying that it is the first part which we do not want to
> change) or not (in which case it is a broken part which we want to change).
> Then we we remove the text from these broken properties and recalculate the
> stencil (which will then be without text).
> Cheers,
> Valentin

Well, actually you set 'stencil for the _first_ of siblings.
Simply delete that:

#(define (my-callback grob)
  (let* (
         ; have we been split?
         (orig (ly:grob-original grob))
         ; if yes, get the split pieces (our siblings)
         (siblings (if (ly:grob? orig)
                     (ly:spanner-broken-into orig) '() )))

    (if (and (>= (length siblings) 2)
              (not (eq? (car siblings) grob)))
      (ly:grob-set-property! grob 'text #f))))

Furthermore, I think ly:grob-original will always return a grob, thus
the check for it could be removed.
Probably a different if-condition may be cheaper (not sure about it,
though), making for:

#(define (my-callback grob)
  (let* ((orig (ly:grob-original grob))
         (siblings (ly:spanner-broken-into orig)))
    (if (and (pair? siblings) (member grob (cdr siblings)))
        (ly:grob-set-property! grob 'text #f))))


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