> You're the first one ever to ask about broken spanners, (I am
> surpised no-one did it before), but there is no real way to control
> them except by getting your hands dirty. The problem is that during
> input & interpretation one doesn't know if a spanner is broken or
> not. I haven't thought of what kind of interface should be
> provided.
What about this:
Any spanner should be a triple of property sets for
not-broken
before-break
after-break
and the particular callbacks should use the proper set. (This is
similar to TeX's \discretionary primitive.)
In the normal case, the properties from non-broken are simply copied
to before-break and after-break.
> \property Voice.Tie \override #'after-line-breaking-callback =
> #my-callback
> c1\break ~ c2 ~ c
While this works for a single voice, it fails for chords, as far as I
can see -- right here you have to fiddle with offsets! At least
provide something similar to the accidental interface, e.g.
\context Staff \outputproperty #(make-after-break-position-checker 0)
#'extra-offset = #'(0 . 2)
\context Staff \outputproperty #(make-after-break-position-checker -1)
#'extra-offset = #'(0 . 1)
(I leave it to you to write a nice make-after-break-position-checker
function :-)
I think modifying the callback isn't the right solution since you
can't pass parameters, right?
Werner
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