Re: [Lilypond-auto] Issue 3560 in lilypond: Completion_heads_engraver with \scaleDurations

[lilypond]

Comment #47 on issue 3560 by address@hidden: Completion_heads_engraver with  
\scaleDurations
http://code.google.com/p/lilypond/issues/detail?id=3560

A music function has no notion of the starting time.  You can do
{ r8 \scaleDuration ... }
In a somewhat better situation are music functions run at scorification  
time.  But this kind of job (labelling music expressions with factors or  
whatever) would likely be best situated with an iterator: an iterator has  
an authoritive notion of timing and works on music expression rather than  
stream events.  But iterators don't have scoped variables like contexts  
have, so you probably have to copy the whole content before labelling it  
and and iterating into it (iterators are not supposed to change music  
expressions).

But you'd still want to use an _engraver_ for the actual splitting itself  
since you often want to limit that kind of action to single contexts.

And then we get something that is nice as long as it works in its  
envisioned use case, and unmaintainably complex to handle for the user when  
it doesn't.

I don't see the point.

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