Re: [Lilypond-auto] Issue 4083 in lilypond: \keepWithTag does not nest well

[lilypond]

Comment #1 on issue 4083 by tdanielsmusic: \keepWithTag does not nest well
https://code.google.com/p/lilypond/issues/detail?id=4083

Re #1:

> a) Provide a declaration \tagLayer #'(divI divII unisono) that
> declares the given tags as belonging to one layer.
> \keepWithTag will only remove material with tags in the same layer.

I like this as it is easy to explain and understand.

> Should be pretty robust and fully backwards-compatible but
> relies on global side effects.

What would these be?  Would they be serious?

> b) \keepWithTag only removes tagged music without the given
> tag(s) in sequential or parallel music only when one of the
> named tags is actually present on one of the other elements
> of the list.

What list?

I don't understand this, maybe because of the two "only"s.
I'm still trying to work out whether they have a subtle
meaning when present together or whether it's just a typo.

> That's probably my favorite though it will likely mandate
> that you place all the tags in one construct or via one function.

What sort of construct is meant here?  Do you mean via a
special (new) function?

> c) \keepWithTag, while keeping one piece of tagged music,
> removes all tags on the same music so that another call of
> \keepWithTag with a different tag will no longer see them.
> That one seems complex to explain and would likely either
> require using \keepWithTag calls in a certain order
> (in->out or was it the other way round) or would use a
> "commutatable" mechanism that would likely be even harder
> to explain.

Looks too complex to be a starter to me.

Trevor


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