Re: Issue 3918: Add \alternatingTimeSignatures (issue 97110045)

[Thomas Morley]

2014-05-17 0:38 GMT+02:00 Urs Liska <address@hidden>:
> Am 16.05.2014 09:41, schrieb address@hidden:

>>
>> Well, we have \omit already.  What if we had
>> \appearance [markup] [grobname or music]
>>
>> Which would basically be the syntactic sugar for overriding the stencil
>> with an appropriate grob-interpret-markup?
>>
>> That way one could just define some markup function for formatting time
>> signatures and use it either in markup contexts or indeed for overriding
>> a time signature.
>
>
> If I understand you correctly this would mean that one would write
>
> \appearance \fractionList #'((6 8)(5 4)) Score.TimeSignature
>
> instead of
>
> \override Score.TimeSignature.stencil = \fractionList #'((6 8)(5 4))
>
> ?

I think David thought of something at the lines of the following function:

appearance =
#(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 #}))

\relative c' {
    \appearance
      \markup "XY"
      Staff.Clef

    \appearance
      \markup
        \override #'(baseline-skip . 0)
        \override #'(word-space . 0.2)
        \line {
          \center-column { \number 3 \number 4 }
          \center-column { \number 6 \number 8 }
        }
      Score.TimeSignature
    c1
}

Cheers,
  Harm