Hello Paul, while I’m not entirely sure what is going on there it seems like the iterator for quoted music is messing with the logic of the iterator for percent repeated music. This is done not by the engraver, but by the iterator. Basically the iterator decides on whether to create PercentReapeat, DoublePercentRepeat or RepeatSlash by determining whether the repeated music as well as the first repeat starts on the start of a measure (that is, main part of measure position > 0) and if the current measure is by 1 (Percent) or by 2 (Double Percent) higher than the starting measure.
Essentially it checks: Do we start at the begin of a measure, and if so, does
or repeated music take exactly one or two measures?
Here this check seems to fail, so Lilypond defaults to Repeat slashes.
I’ve added some debug output to the code in question, which returned that in
fact the measure position is always 0 and the internal bar number unset for
the quoted music. This seems to imply that in the quoted case the music stream
is iterated all at the beginning.
#######
Upon further investigation (sorry, I’m not motivated enough to reword the
above): It seems like the quoted music is in fact iterated during addQuote.
So this means we have two conflicting assumptions there: The percent repeat
iterator assumes that it may depend on the current timing position, while the
quoting system assumes that this is not done.
This particular problem should be solvable by shifting the decision of what
type of repeat to create into the engraver rather than the iterator. But on
more general terms I think this is a problem of the quoting system, as we do
have more than just this one iterator that depend on timing information, such
as grace notes, which cause similar problems:
anotes = \fixed c' {
\time 2/4 \grace { a'8 b' } a'2
}
\addQuote qa \anotes
bnotes = \absolute{ \time 2/4 \quoteDuring qa s2 }
\score{ << \anotes \bnotes >> }
So the proper solution would be to actually change the mechanism of how
quoting works, so that the quoted music is only iterated at the correct time.
Maybe we could for example have quoted musics be iterated, but broadcasted to
a special "sink", and the quoted music iterator would then simply take the
events thus produced and broadcast them to the relevant contexts. This could
even keep track of spanner events to keep track of currently active spanners,
and handle situations like this:
anotes = \fixed c' {
a2( a a a)
}
\addQuote qa \anotes
bnotes = \absolute{ a'1 \quoteDuring qa s1 }
\score{ << \anotes \bnotes >> }
I’ll CC this to devel for discussion.
Cheers,
Valentin
Am Dienstag, 16. Mai 2023, 07:54:42 CEST schrieb Paul Scott:
> I asked about this 3 years and I don't remember getting a workable answer:
>
> I would expect the two voices in the following MWE to have the same
> simple percent signs. Is there a way get the expected result?
>
> \version "2.25.4"
>
> anotes = \fixed c' {
> \time 2/4 \repeat percent 2 { a2 } \repeat percent 2 { a16( g f g a8) b }
> }
> \addQuote qa \anotes
>
> bnotes = \absolute{ \time 2/4 \quoteDuring qa s2*4 }
>
> \score{ << \anotes \bnotes >> }
>
> TIA,
>
> Paul
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