[patch] first-clef property

[Nicolas Sceaux]

Hi,

When typesetting ancient music, one may want to produce two editions:
eventually one with original clefs, as found in the manuscripts, and an
other one with new fashioned clefs. It is also custom in the later case
to print first the ancient clef (which bears some extra meaning, for
instance which particular instrument should play that part), then the
modern one, at the beginning of a piece.

I use a customized version of the \clef command, which allows specifying
two clefs, eg. \clef "soprano/treble". If some option is set, it behaves
like \clef "soprano", otherwise it behaves like \clef "treble", except
at the beginning of the first line, where a little soprano clef is
printed before the treble clef. The first-clef property makes it
possible to detect when it is the beginning of the piece.

The attached patch adds this first-clef grob property. May I apply it?
I understand that it may not be preferable to add code that presumably
would be useful to a single person... but this patch is very tiny :-)
And I've seen some posts showing interest for this kind of feature.

Nicolas

first-clef.patch
Description: Binary data