Re: wrapping music

[Urs Liska]

Am 11.03.2014 14:57, schrieb Xavier Noria:
> I am writing a score that has a few notes with cross heads. It would be
> helpful to define \cross such that
>
>     \cross { c8 c8 c8 }
>
> would expand to:
>
>     \override NoteHead.style = #'cross
>     c8 c8 c8
>     \revert NoteHead.style
>
> Is that possible?
Yes:

cross =
#(define-music-function (parser location music)(ly:music?)
   #{
     \temporary\override NoteHead.style = #'cross
     $music
     \revert NoteHead.style
   #}
   )

{
  \cross { c8 c8 c8 }
}

(I don't know when (recently) the \temporary was included (I think 
somewhere in 2.17). This ensures that NoteHead.style won't be reverted 
to its _default_ value but to the value that was active _immediately 
before_.

HTH
Urs