Re: optional transposition triggered by an external file?

[Marc Hohl]

Am 30.07.2013 09:56, schrieb David Kastrup:
> Marc Hohl <address@hidden> writes:
>
> > > > \begin{appendix}
> > > > \chapter{For Bb instruments}
> > > > \begin{lilypond}
> > > > #(define transposeTo d)
> > > > \include{A.ly}
> > > > \end{lilypond}
>
> Rather \include "A.ly"

Of course, silly me.

> > 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?
>
> Well, Scheme does not autodeclare variables, so it's more complex:
>
> #(define transposeTo (if (defined? 'transposeTo) transposeTo #{ c #}))

'defined?' is exactly what I needed – thanks a lot!

Marc