Re: Glissando function

[David Kastrup]

Benjamin Fluehr <address@hidden> writes:

>> The examples in the manual don't really require Scheme knowledge.
>
> Mostly true, but my lack of Scheme knowledge prevents me from fully
> understanding the error messages when things go wrong. Here is my attempt:
>
> \version  "2.18.0"
>
> crossGlissando =
> #(define-music-function
>   (parser location noteA noteB)
>   (ly:music? ly:music?)
>   #{
>     #noteA \glissando
>     \change Staff = "up"
>     #noteB
>     \change Staff = "down"
>   #})
>
> \score {
>   \new StaffGroup <<
>     \new Staff = up
>     \new Staff = down {
>       \new Voice {
>         \crossGlissando c' d'
>       }
>     }
>   >>
> }
>
> And the associated errors:
> error: syntax error, unexpected EVENT_IDENTIFIER
> #noteA
> \glissando

That's actually a different problem: you cannot attach articulations to
music events in variables.  You can probably futz around this a bit by
using things like

< $NoteA >\glissando

but of course that only works when NoteA is just a single note.  It is
true that one can work around some of that by reverting to actual Scheme
programming.

-- 
David Kastrup