Le jeudi 02 mars 2023 à 12:11 -0700, Alexandre Loomis a écrit :
> Hi,
>
> I'm having trouble defining a harp pedal spanner. I'd like to be able to
> write code like
>
> \relative c' { f4 _\startPedal "F♮" g fes \endPedal "♭" }
>
> and get as output the notes, with F♮ below the f natural, ♭ below the f flat,
> and a line connecting the markups. So far the closest I've been able to get
> is
>
> \relative c' { \startPedal "F♮" \endPedal "♭" f4 _\startTextSpan g fes
> \stopTextSpan }
>
> where startPedal and endPedal are defined as
>
> startPed =
> #(define-music-function
> (text)
> (markup?)
> #{
> \once \override TextSpanner.dash-fraction = #1.0
> \once \override TextSpanner.bound-details.left.text = #text
> \once \override TextSpanner.bound-details.left.stencil-align-dir-y =
> #CENTER
> \once \override TextSpanner.font-shape = #'upright
> #}
> )
>
> endPed =
> #(define-music-function
> (text)
> (markup?)
> #{
> \once \override TextSpanner.bound-details.right.text = #text
> \once \override TextSpanner.bound-details.right.stencil-align-dir-y =
> #CENTER
> #}
> )
> This produces the correct output, but needing to call all four of startPed,
> endPed, startTextSpan, and stopTextSpan is inconveniently verbose.
With `\override`, you need to put the command before the note, but LilyPond
also has `\tweak`, which attaches to the event itself, so you can do
```
\version "2.24.1"
startPed =
#(define-music-function (start-text end-text) (markup? markup?)
#{
\tweak dash-fraction #1.0
\tweak bound-details.left.text #start-text
\tweak bound-details.left.stencil-align-dir-y #CENTER
\tweak font-shape #'upright
\tweak bound-details.right.text #end-text
\tweak bound-details.right.stencil-align-dir-y #CENTER
\startTextSpan
#})
endPed = \stopTextSpan
\relative c' { f4 _\startPed "F♮" "♭" g fes \endPed }
```
Note that this isn't exactly your wished syntax because the end text is given
to `\startPed`, not to `\endPed`. There are no built-in ways to override the
properties of a spanner at a later point than the moment it has been created
in, so it would require custom Scheme code to make your original syntax work.
Unless you really want that, I suggest you just use this syntax, which isn't
more verbose than yours.
HTH,
Jean
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