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Re: make-musicglyph-markup puzzle

From: Dan Eble
Subject: Re: make-musicglyph-markup puzzle
Date: Sat, 8 Nov 2014 15:59:51 -0500

> On Nov 8, 2014, at 03:48 , David Kastrup <address@hidden> wrote:
> Dan Eble <address@hidden> writes:
>> I’m having trouble figuring out how to make this function fall back on 
>> another time signature style (make-simple-numbered-time-signature-markup 
>> fraction) if the requested glyph is not present.
>> (define-public (make-glyph-time-signature-markup style fraction)
>>    (make-musicglyph-markup (string-append
>>                             “timesig.”
>>                             (symbol->string style)
>>                             (number->string (car fraction))
>>                             (number->string (cdr fraction)))))
> That's probably not all that easy since a "markup" is just a sequence of
> sort-of function calls producing stencils.  And before the calls get
> executed, the fonts in question are not yet known.
> So you'll probably rather need to write
> (define-markup-command (glyph-time-signature ...
> since the code executed in _that_ definition is what is called at
> stencil creation time.

By morning’s light, I realized I had solved this problem before.  Behold the 
\or markup command:

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