Paul Morris <p...@paulwmorris.com> writes:
> 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).
I don't think it makes a lot of sense to support procedures as then so
many internals shine through that the abstraction is basically gone.
I am already unconvinced about stencils for that reason.
> So we'd need:
>
> markup-or-stencil-or-procedure?
markup-or-stencil-or-procedure-or-false? ...
We don't do this elsewhere.
--
David Kastrup
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