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

[lilypond]

Comment #8 on issue 4083 by address@hidden: \keepWithTag does not  
nest well
https://code.google.com/p/lilypond/issues/detail?id=4083

Here's another idea in the interest of brainstorming various possibilities.

d) Allow hierarchical tags, something like:

\tag aa.red \musicZ
\tag aa.blue \musicY
\tag bb.apple \musicX
\tag bb.pear \musicW

\removeWithTag bb
% removes both bb.apple and bb.pear

Then provide a version of \keepWithTag that only removes tags at the given  
level of depth.

\keepWithTagAtSameDepth aa.blue
% only removes aa.red

Or have \keepWithTag itself only work at the given level of depth.  Then  
you would need to use it at each level to remove all but one tag.  Like so:

\keepWithTag aa
\keepWithTag aa.blue
% removes all tags except aa.blue

This avoids global variable scope, but I'm not sure if it's worth the added  
complexity of hierarchical tags, and of course it requires more typing for  
each tag instance.  The LSR's \keepOrRemoveWithTag may be a better approach.



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