Interesting. So if the default property is set at the Staff level, for
instance, then changed and \unset at the Voice level, it goes back to the
default for the higher-level context. But if in the example \new Staff
\with... is changed to \new Voice \with... the original problem arises
where \unset reverts to the built-in default.
Didn't realize about the \tuplet syntax. That's quite useful. Thanks for
the tip!
Actually, I just used tupletSpannerDuration because it was convenient to
write a tiny example. My practical use case is changing the default
keepAliveInterfaces for certain staves.
On Sun, Jul 1, 2018 at 1:00 AM David Kastrup <d...@gnu.org> wrote:
> Saul Tobin <saul.james.to...@gmail.com> writes:
>
> > In both 2.18 and 2.19, \unset appears to set a context property to the
> > built-in default, rather than the default set in the \with {} block:
> >
> > music = \relative c' {
> > \tuplet 3/2 {
> > c8 c c d d d e e e f f f |
> > }
> > \set Staff.tupletSpannerDuration = #(ly:make-moment 1/2)
> > \tuplet 3/2 {
> > c8 c c d d d e e e f f f |
> > }
> > \unset Staff.tupletSpannerDuration
> > \tuplet 3/2 {
> > c8 c c d d d e e e f f f |
> > }
> > }
> >
> > \new Staff \with {
> > tupletSpannerDuration = #(ly:make-moment 1/4)
> > } \music
> >
> > In cases like this, I would find it useful to reset the property to the
> > custom default value without having to explicitly \set it every time. Is
> > there a way to do this? Also, is this the most useful behavior of \unset?
>
> There are several approaches. The tupletSpannerDuration is actually
> interpreted at Voice level, so if you set/unset the Voice level value,
> it remains dominant while set and can be unset nicely:
>
> music = \relative c' {
> \tuplet 3/2 {
> c8 c c d d d e e e f f f |
> }
> \set tupletSpannerDuration = #(ly:make-moment 1/2)
> \tuplet 3/2 {
> c8 c c d d d e e e f f f |
> }
> \unset tupletSpannerDuration
> \tuplet 3/2 {
> c8 c c d d d e e e f f f |
> }
> }
>
> \new Staff \with {
> tupletSpannerDuration = #(ly:make-moment 1/4)
> } \music
>
> But of course for this functionality in particular, use the optional
> tuplet spanner duration argument to the \tuplet music function:
>
> music = \relative c' {
> \tuplet 3/2 {
> c8 c c d d d e e e f f f |
> }
> \tuplet 3/2 2 {
> c8 c c d d d e e e f f f |
> }
> \tuplet 3/2 {
> c8 c c d d d e e e f f f |
> }
> }
>
> \new Staff \with {
> tupletSpannerDuration = #(ly:make-moment 1/4)
> } \music
>
> In fact, I'd lean towards using it always and not even bother setting
> tupletSpannerDuration at all. So basically:
>
> music = \relative c' {
> \tuplet 3/2 4 {
> c8 c c d d d e e e f f f |
> }
> \tuplet 3/2 2 {
> c8 c c d d d e e e f f f |
> }
> \tuplet 3/2 4 {
> c8 c c d d d e e e f f f |
> }
> }
>
> \music
>
> It's minimal writing effort and keeps the information where it belongs.
>
> --
> David Kastrup
>
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