Hi David,
But it does not seem to be possible to _set_ this "current duration"
from scheme, does it?
Why would that be a good idea?
Consider a situation where \myFunction with signature (ly:duration?)
generates some complex music expression in which the given duration is used.
Currently, in
(*) { a2 \myFunction 4 c }
is equivalent to
{ a2 \myFunction 4 c2 }
but in some situations it might be more natural for the user to expect
(*) to yield
{ a2 \myFunction 4 c4 }.
(More concretely, in our use case, \myFunction expected "a chord or a
duration". This leads to a behaviour where
a2 \myFunction 4
does not change the "current duration", but
a2 \myFunction <a c>4
does.)
Lukas
