Re: macro for \once\override

[Aaron Hill]

On 2020-08-29 5:23 am, David Kastrup wrote:
> Wols Lists <antlists@youngman.org.uk> writes:
>
> > On 29/08/20 05:45, Werner LEMBERG wrote:
> > >       \once \override FretBoard.size = #'1.0
> > >       \once \override FretBoard.fret-diagram-details.barre-type = 
> > > #'straight
> > >       \once \override FretBoard.fret-diagram-details.dot-color = 
> > > #'black
> > >       \once \override FretBoard.fret-diagram-details.finger-code = 
> > > #'below-string
> > >       c'
> >
> > Unfortunately this might well require re-writing the parser, but it
> > struck me it might be a nice idea to nick an idea from other object
> > oriented languages as follows ...
> >
> >     \once \override FretBoard.size = #'1.0
> >     \once \override \using FretBoard.fret-diagram-details {
> >         .barre-type = #'straight
> >         .dot-color = #'black
> >         .finger-code = #'below-string
> >     }
> >     c'
>
> What's wrong with
>
>   \once \override FretBoard.fret-diagram-details =
>     #'((barre-type . straight)
>        (dot-color . black)
>        (finger-code . below-string))
>
> I mean, I am as proud as anybody that separate subproperty overrides
> don't cause LilyPond to go down in flames any more, but this is an
> alist, after all.

In my testing, that overwrites any existing overrides on the 
fret-diagram-details property, so it is not quite the same thing.

-- Aaron Hill