I understand. Maybe we could make sure to evaluate relevant properties in music_font_alist_chain should they be a callback? Alternatively we might also change the internal callback structure. Kind of if a property is a callback ((grob) ...) we might wrap it into a function like (() ((grob) ...) (this-grob))
This would allow us to call the callback property just by the property without always having the grob around (and it should not induce problems, as you’d normally not call a callback for a grob on a different grob). Cheers, Valentin Am Mittwoch, 2. März 2022, 07:37:52 CET schrieb Jean Abou Samra: > Le 01/03/2022 à 20:34, Valentin Petzel a écrit : > > Hello Robert, > > > > the problem here is that the font-size property of the NoteHead is not > > evaluated. (This happens from time to time, and I’m not sure why this is > > so.) > Look at Font_interface::get_default_font. It takes a property alist > chain from the grob and then applies the font selection mechanism > to this alist chain. If there are callbacks, they won't be understood, > and the grob is not available in this part. This is a known dark > corner in LilyPond's design, caused by the interaction between > markups and grobs. Font selection works with alist chains because > that's all you have when working with a markup. Similarly, this > means that the properties used by a markup that gets interpreted > by grob-interpret-markup are not automatically evaluated if > they are callbacks. Better would be changing markups not to use > alist chain but some kind of overarching data structure that > could come with a grob or not, and would automatically execute > callbacks transparently on property accesses. Another possibility > would be to make the interpretation of standalone markups > actually handled by a special grob. Yet another one would be > traversing the markup to resolve all properties it uses (as > declared by the markup command definitions) beforehand. > The last one would be less flexible though. > > Best, > Jean
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