Re: Scheme function for ossia

[Trevor Daniels]

Jonathan Wilkes wrote Monday, August 24, 2009 6:24 AM


> Would probably help if I showed the file :).  I'm guessing the 
> problem
> is it's not allowed to use a variable inside of the braces after 
> the \with
> command, but I don't understand why.

Correct.  A \with clause may contain only

a) property operations

That's changing context or grob properties

b) context definitions

That's things like \consists, \accepts etc.

This was one of my questions as a newbie
three years ago next week!  The answer came
from Nicolaus Sceaux, see
http://lists.gnu.org/archive/html/lilypond-user/2006-08/msg00560.html

A music function has to return some music,
so you need to pass the ossia music to the
music function too, and include the \new Staff
as well, like this:

ossia = #(define-music-function (parser location staffName music)
 (string? ly:music?)
#{
 \new Staff \with {
   alignAboveContext = #$staffName
   \remove "Time_signature_engraver"
   fontSize = #-3
   \override StaffSymbol #'staff-space = #(magstep -3)
   \override StaffSymbol #'thickness = #(magstep -3)
 }
 $music
#})

Trevor

> -Jonathan
>
> \version "2.12.2"
>
> ossia = #(define-music-function (parser location staffName)
>  (string?)
> #{
> alignAboveContext = #$staffName
> \remove "Time_signature_engraver"
> fontSize = #-3
> \override StaffSymbol #'staff-space = #(magstep -3)
> \override StaffSymbol #'thickness = #(magstep -3)
> #})
>
> myMelody = \new Staff = main {
> \relative c' {
> c8 d e f g a b c |
> <<
> {
> d1
> }
> {
> \new Staff \with { \ossia #'main } {
> \relative c' {
> \clef bass
> c4 d e f
> }
> }
> }
> >>
> }
> }
>
> \score {
> \myMelody
> \layout {
>  }
> }
>
>
>
>
>
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