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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