Thank you, Jean, for the clarification and the suggestion for using the
\repeatTie.
Finally I decided to stick to a more general slur and \tweak control-points
that shift the slur horizontally to the desired position. The below example
cleanly compiles without a programming error.
*Working example*
\version "2.23.14"
\relative {
\repeat volta 2 {
g'1( |
\alternative {
\volta 1 { g2 g) | }
\volta 2 {
g2
\tweak control-points
#'((-0.5 . -3.0) (2.5 . -3.0) (4.5 . -3.0) (5.3 . -2.0))
( g)
\bar "|."
}
}
}
}
[image: image.png]
Just for curiosity, why did the Lilypond version change from 2.23.14 to
2.23.80?
Thank you,
Vlad
On Fri, Oct 28, 2022 at 12:01 AM Jean Abou Samra <j...@abou-samra.fr> wrote:
>
>
> Le 27/10/2022 à 23:06, Volodymyr Prokopyuk a écrit :
> > Hello,
> >
> > When working with the manually shaped slurs using the \tweak
> > control-points approach, I've got the right output, but with the
> > following programming error: bounds of this piece aren't breakable
> > that always happens when the shaped slur is attached to the last note
> > in a measure.
> >
> > *Minimal failing example*
> >
> > \version "2.23.14"
> >
> > \relative {
> > \repeat volta 2 {
> > g'1( |
> > \alternative {
> > \volta 1 { g2 g) | }
> > \volta 2 {
> > g2 g
> > \tweak control-points
> > #'((-5.5 . -3.0) (-3.5 . -3.0) (-1.5 . -3.0) (-0.3 . -2.0))
> > ( <>)
> > \bar "|."
> > }
> > }
> > }
> > }
> >
> >
> > The output is rendered, but with the below programming error
> >
> > GNU LilyPond 2.23.14 (running Guile 2.2)
> > Processing `shaped-slur.ly <http://shaped-slur.ly>'
> > Parsing...
> > Interpreting music...
> > Preprocessing graphical objects...
> > Finding the ideal number of pages..
> > Fitting music on 1 page...
> > Drawing systems...
> > shaped-slur.ly:10:9: programming error: bounds of this piece aren't
> > breakable.
> >
> > \tweak control-points
> > shaped-slur.ly:10:9: continuing, cross fingers
> > Converting to `shaped-slur.pdf'...
> > Success: compilation successfully completed
> >
> > *Minimal working example*
> > *
> > *
> > However,/if there is a rest/ after the note with the attached shaped
> > slur, there is no programming error
> >
> > \version "2.23.14"
> >
> > \relative {
> > \repeat volta 2 {
> > g'1( |
> > \alternative {
> > \volta 1 { g2 g) | }
> > \volta 2 {
> > g2 g4
> > \tweak control-points
> > #'((-5.5 . -3.0) (-3.5 . -3.0) (-1.5 . -3.0) (-0.3 . -2.0))
> > ( <>) r
> > \bar "|."
> > }
> > }
> > }
> > }
> >
> > What is the reason for the programming error in the failing example?
> > Is there a way to get the output from the failing example, but without
> > the programming error?
>
>
>
>
> This sounds like this issue in the LilyPond bug tracker:
>
> https://gitlab.com/lilypond/lilypond/-/issues/6232
>
> When you do
>
> \version "2.23.80"
>
> { c'( <>) c' }
>
> this is equivalent to
>
> \version "2.23.80"
>
> { c'( c') }
>
>
> In other words, using the empty chord <> attaches the event at
> the same moment as the notes that follow this empty chord. Now,
> in
>
> { c'( <>) }
>
> you are conceptually attaching the end of the slur to some
> non-existent note after the end of the piece. I understand
> the request that it should work, but I think it's not very
> surprising that it doesn't work.
>
> If I were you, I would just use \repeatTie and \shape.
> You are already using \shape, so the default layout
> of \repeatTie that looks like a tie and not like a slur
> is not so problematic.
>
> Best,
> Jean
>
>
