Re: How to get all Voice-Contexts?

[David Kastrup]

Thomas Morley <address@hidden> writes:

> Hi,
>
> for some engraver I need to look at all Voices, comparing them in some regard.
>
> If I put the engraver in every Voice, then every Voice is processed,
> yes, but I can't find a method to compare them.
> So I thought the way might be to put the engraver in Score, get the
> Voices and do nasty things ...
>
> Though, I can't find a method to select all Voices.
>
> Consider this tiny and boiled down example:
>
> %%%%%%%%%%%%%%%
> \version "2.19.32"
>
> get-Voices =
> \context Score \applyContext #(lambda (ctx) (display ctx))
>
> \score {
>     \new Staff
>     <<
>       \new Voice = "1" { \get-Voices c''1 }
>       \new Voice = "2" { e'1 }
>     >>
> }
> %%%%%%%%%%%%%%%%
>
> How to get all Voices looking down from Score?

You could have an engraver listen for AnnounceNewContext and
RemoveContext events and keep tally of the Voice contexts among them in
a hash table or something like that.

-- 
David Kastrup