2017-05-02 8:29 GMT+02:00 Urs Liska <u...@openlilylib.org>:
> Hi all,
>
> I'm trying to apply event functions to music passed into a music function
> like that:
>
> \version "2.19.57"
>
> test =
> #(define-music-function (mus)(ly:music?)
> #{
> #mus \startGroup
> #})
>
> {
> \test c' d' e' f' \stopGroup
> }
>
>
> (of course this is not what I ultimately want to achieve, but the nucleus
> from which I'll be able to continue on my own).
>
> This fails with "error: syntax error, unexpected EVENT_IDENTIFIER". I think
> it is because the #mus expression is somehow already complete (differently
> from when used in regular input) and I have to somehow *apply* the
> \startGroup event function to the #mus argument.
>
> From \displayMusic I can see that it is added as a NoteGroupingEvent to the
> note's articulations, but I'd like to ask if there's a more straightforward
> way to attach the event to the music than rebuilding the music expression in
> Scheme.
> OTOH I will want to do that for the first *and last* element in a music
> expression (in order to apply the start and stop command to a sequence of
> notes), so I may *have* to extract the Scheme representation anyway?
>
> TIA
> Urs
\layout {
\context {
\Voice
\consists "Horizontal_bracket_engraver"
}
}
test =
#(define-music-function (mus)(ly:music?)
#{
<>\startGroup
$mus
<>\stopGroup
#})
{
\test { c' d' e' f' }
}
Should do the trick.
Cheers,
Harm
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