Different notehead if beaming used

[Aleksandr Andreev]

Hello list,

After a hiatus related to the end of the semester here, I figured I'd
take a stab at solving this issue:
http://code.google.com/p/lilypond/issues/detail?id=2492

The problem is that a different note head needs to appear for the
Kievan eighth note if the note is beamed. (In Kievan notation, only
two notes would be beamed. You would never have more than two notes
beamed together).

Related to this is the fact that since stems are not used, the beam
engraver evidently cannot figure out the correct placement of the
beam. A set of warnings is also returned. Perhaps this could be solved
by making stems invisible instead of turning them off completely?

With regard to the note head, the approach I am thinking of taking is
to add two additional glyphs, which would be used for an eighth note
that is beamed (an "up" glyph and a "down" glyph.) These glyphs would
be identical to the glyphs for the quarter note.

My question is this: is it possible to determine, from note-head.cc,
whether the note head will be beamed? Then the selection could be done
much in the same way as the selection based on staff position.

Any guidance is always appreciated!

Aleksandr