Thomas Morley-2 wrote
> Maybe a step in this direction:
>
> \version "2.19.6"
>
> appear =
> #(define-music-function (parser location mrkp item)
> (markup? symbol-list-or-music?)
> (let ((stil (lambda (item)
> (grob-interpret-markup item mrkp))))
> #{ \tweak stencil #stil #item #}))
Assuming we would want to support stencils as well as markups, we'd need a
new type predicate:
markup-or-stencil?
And if it is to be as flexible as a \tweak, then it should also support
procedures (i.e. that return a stencil). So we'd need:
markup-or-stencil-or-procedure?
A stencil or procedure could just be passed through unmodified to the
\tweak, while a markup would be converted to a stencil first. (Would there
be a way to get procedures that return a markup to work? I don't think
so...)
http://lilypond.org/doc/v2.18/Documentation/notation/predefined-type-predicates
Cheers,
-Paul
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