Re: how would one cross-reference two [or more] books?

[Jean Abou Samra]

Le 14/01/2023 à 21:51, Jeff Olson a écrit :
> On 1/13/2023 1:27 PM, Jean Abou Samra wrote:
> > LilyPond 2.24.1 is planned for the end of January or early February. 
> > Whether it includes this mostly depends on whether Ivan Maidanski has 
> > released BDWGC 8.2.3 by then.
>
> Thanks for the update, Jean!  Could you also help me understand what 
> was happening with \page-ref in my original post?  E.g., ...
>
> What causes \page-ref to fail for labels outside of the current \book?
>
> Can the caller of \page-ref predict when it would fail, so as to avoid 
> calling it if it would fail?
>
> Or if you have to let it fail, can the last arg (default) be replaced 
> with a callback that would undo the conversion of a label into a 
> stencil?  I considered checking the output stencil of \page-ref, but 
> doesn't that have specific position info included that would make it 
> difficult to match against?
>
> Why does the "Sav0" invocation of \save-page-refs behave as though it 
> is being called after the "Sav1" and "Sav2" invocations, while, in 
> contrast, the four invocations of \indexItem ("Top", "No.1", "No.2" 
> and "No.3") leave side effects in the index showing their results in 
> the order of appearance?
>
> Clearly Lilypond isn't just "executing" commands to completion in 
> order of appearance or the ordinary table-of-contents at the beginning 
> of a document wouldn't work. Maybe that's just old imperative thinking 
> vs functional thinking, but some of these temporal issues make it look 
> dysfunctional at times.
>
> What's the right way to think about these issues?


Sorry, I currently have little time to look into this / other
priorities. Maybe someone else can chime in.

Best,
Jean

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