Paul Morris <p...@paulwmorris.com> writes:
> Paul Morris wrote
>> (The only possible down side I see is that users may find it strange to
>> supply an output definition as a function argument, but I don't know of a
>> way around that.)
>
> Well, here's one possible way.
> -Paul
>
> \version "2.19.16"
>
> accept-like =
> #(define-scheme-function (parser location old new out)
> (symbol? symbol? ly:output-def?)
> (for-each
> (lambda (p)
> (let* ((sym (car p))
> (def (cdr p))
> (acc (ly:context-def-lookup def 'accepts)))
> (if (and (memq old acc) (not (memq new acc)))
> (ly:output-def-set-variable! out sym
> (ly:context-def-modify
> def
> (ly:make-context-mod
> `((accepts ,new))))))))
> (ly:output-find-context-def out))
> out)
>
> accept-like-layout =
> #(define-scheme-function (parser location old new)
> (symbol? symbol?)
> #{ \accept-like $old $new \layout { } #})
>
> accept-like-midi =
> #(define-scheme-function (parser location old new)
> (symbol? symbol?)
> #{ \accept-like $old $new \midi { } #})
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%
>
> \layout {
> \context {
> \Voice
> \name myVoice
> \alias Voice
> \override NoteHead.color = #blue
> }
> }
>
> \accept-like-layout Voice myVoice
An extra command seems like bikeshedding when you can just write
\accept-like Voice myVoice \layout { }
instead.
--
David Kastrup
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