grob-object information

[Marc Hohl]

Hello list,

for my work on the volta bracket inclusion for the new bar line interface,
I need to know how the bars are ordered in (ly:grob-object grob 'bars).

Please see the attached file.

For the \musOne, I get a grob array with eight BarLine grobs
(two for each staff) for the first volta bracket (and one for
the second volta bracket, of course):

|------volta------|
<BarLine> <BarLine>
<BarLine> <BarLine>
<BarLine> <BarLine>
<BarLine> <BarLine>


For \musTwo, I get a grob array consisting of eight BarLine grobs
(because the bracket spans eight bars in a single line) and a second
one for the second volta bracket.

|-------------------------------------volta-----------------------------------|
<BarLine> <BarLine> <BarLine> <BarLine> <BarLine> <BarLine> <BarLine> 
<BarLine>


Is there any chance to get to know how the grobs are arranged?
Or more formally: how can I get the 2D structure back from a 1D vector?

Thanks in advance,

Marc

shortvoltatest.ly
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