Re: make-musicglyph-markup puzzle

[Dan Eble]

> 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:

    https://codereview.appspot.com/169290045/
— 
Dan