Re: \fromproperty as instrument name

[David Kastrup]

Menu Jacques <address@hidden> writes:

> Hello folks,
>
> I’d like to use the instrument name specified in the header as the actual 
> instrument name:
>
> %%%%%%%%%%
> \version "2.19.39"
>
> \header {
>   instrument = "Premier"
> }
>
> % The score definition
> \score {
>   {
>     \new Staff <<
>       \set Staff.instrumentName = \markup{\fill-line{\fromproperty 
> #'header:instrument}}
>
>       \context Staff <<
>         \context Voice = "PremierVoiceOne"
>         {
>           a b c d
>         }
>       >>
>     >>
>   }
>
>   \layout {}
> }
> %%%%%%%%%%
>
>
> But I get an error message on the next syntactical element, here \context 
> Staff, see below.

Well, your problem is that header:instrument}} is a valid Scheme
identifier, and \fromproperty apparently just ignores identifiers it
finds undefined.  So your \context appears right after
\markup{\fill-line{ where LilyPond has no idea what to do with it.

If you insert spaces a bit more liberally, you will be less likely to
forget them where they are absolutely essential, like after symbols
parsed by the Scheme interpreter.

-- 
David Kastrup