Re: optional transposition triggered by an external file?

[Marc Hohl]

Am 30.07.2013 02:30, schrieb David Rogers:
> Marc Hohl <address@hidden> writes:
>
> > [...]
> > I need a way to define an optional variable that controls (if defined)
> > the transposition so I can say, for example:
> >
> > \begin{appendix}
> > \chapter{For Bb instruments}
> > \begin{lilypond}
> > #(define transposeTo d)
> > \include{A.ly}
> > \end{lilypond}
> >
> > \begin{lilypond}
> > #(define transposeTo d)
> > \include{B.ly}
> > \end{lilypond}
> >
> > ...
> > \end{appendix}
>
>
> I've never tried this. Is it even possible to define things in the latex
> file that are then parsed by Lilypond? If it is possible, perhaps adding
> a special line inside each of A.ly, B.ly, and C.ly, which contains
> \transpose C \transposeTo .

Yes, that's the plan.

 That looks to me [if it was going to work at
> all] as if your .ly files would then refuse to work if you ever forgot
> to define \transposeTo in your latex file - but maybe it's worth it.

That's exactly what I want to avoid. My idea boils down to allow for
something like

transposeTo = transposeTo OR c

which is Lua-like. Is something similar possible in scheme?

Marc