David, I changed "define" in "define-music-function" and now it works
perfectly, thank you David!
I think this is something can be useful to others so I post the new working
code:
\version "2.19.80"
myScore =
#(define-scheme-function (music) (ly:music?) #{
\score {
$music
\layout{}
\midi{}
} #} )
\myScore {a b c'}
Regards, g.
On 24 November 2017 at 18:18, David Kastrup <d...@gnu.org> wrote:
> Gianmaria Lari <gianmarial...@gmail.com> writes:
>
> > I'm trying to put the score functionality inside a function (consider it
> a
> > test). Here it is the code:
> >
> > \version "2.19.80"
> > myScore =
> > #(define (music) (ly:music?) #{
> > \score {
> > $music
> > \layout{}
> > \midi{}
> > } #} )
> >
> > \myScore {a b c'}
> >
> >
> > The code correctly generate a score but it does not generate the midi
> file.
> > Why???
>
> There is a difference between define (which defines a pure Scheme
> function or expression) and define-music-function (which defines
> something taking arguments in LilyPond syntax and returning a music
> expression) and your input is an interesting mashup where \myScore will
> probably be left as *unspecified* after you define an argumentless
> Scheme function named `music' that first calls ly:music? without
> argument and then would return a score if the ly:music? call had not
> already caused an error due to a missing argument.
>
> Now a score is not a music expression anyway, so you should rather
> replace define with define-scheme-function here in order to avoid
> errors: the resulting \myScore can then return arbitrary expressions
> including whole scores.
>
> --
> David Kastrup
>
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