Re: Bar numbers “repeat aware” for music for dancing

[Niols]

Hello,

And thank you for your answer!

On 22/04/2020 20:01, Flaming Hakama by Elaine wrote:
> > For such tunes, we are not so interested in the “usual” printed bar
> > numbers, but rather in the bar numbers (“repeat aware”) from the dance.
> > In particular, a repeat in the music does not mean a repeat in the
> > dance: if the first eight bars are repeated in the music, I would like
> > the bar numbers to go from 1 to 8 and then directly to 17.
> >
> > I am unsure how to deal with that in an automated and clean way.
>
> I'm not aware of an automated way.

I would love to be able to write one, but I think it requires a much 
better understanding of the intrinsics of LilyPond, and especially the 
"iterators", "engravers" and "performers". I read the LilyPond 
developers documentation about this but that didn't help me so much. Are 
you aware of any reference on the topic?

> On the other hand, I find that it is not really much trouble to just reset
> the bar numbers as you need to.  You're already writing code for \repeat
> volta and \alternative and possibly \bar "||" and so forth, so what is one
> additional line of code to reset the bar number?

That is how I do it currently. However, we start having thousands of 
tunes and a lot of contributors, and every new rule we invent (whether 
it's that there is a || every 8 bars except if there is a volta, that 
there is a break every 4 bars, that the bar numbers are “repeat aware”) 
mean new maintenance tasks to change all the old tunes, new instructions 
for the contributors, and new automated tasks that the contributors have 
to think of. I tend to see computers as tools that should take care of 
everything that one can automate.

I guess it is also a way for me to find a project that will allow me to 
dive a bit into LilyPond, and to satisfy my craving for automation.

> > Also, I would want to not print one bar number but all the bar numbers
> > within the repeat. If the first eight bars are repeated, I would like to
> > print 1 9, 2 10, 3 11, etc. This is less a priority for me but I guess
> > it is linked to the same problem. Would you have pointers for that too?
>
> So, here is a function I use to show duplicate bar numbers.
> You pass in the starting bar number, and the number of repeated bars.
>
> Also, the ones I use for triple and quadruple numbers.

Thank you very much for those! They are definitely going to be useful.

Best regards,
— Nicolas “Niols” Jeannerod