Re: music function to be included somewhere in scm/*

[Alexander Kobel]

On 2016-12-14 19:46, Knut Petersen wrote:
> Am 14.12.2016 um 18:03 schrieb Simon Albrecht:
> > On 14.12.2016 14:54, Knut Petersen wrote:
> > > With a music function \autoextenders that adds extender events to
> > > every syllable you
> > > - can be sure never to forget extenders,
> > > - can be sure never to generate too short extenders
> > > - can use the same lyrics definition for voices that require
> > > extenders at different places.
> > >
> > > Nobody is forced to use \autoextenders, manual definition is still
> > > possible.
> >
> > Would it be possible/wanted to have this triggered by a context
> > property as well? I for one would prefer that, it’s easier to use.
>
> LyricEvents are generated by the following code in music-functions.scm:
>
> (define-public (make-lyric-event string duration)
>   (make-music 'LyricEvent
>               'duration duration
>               'text string))
>
> Here only a few lines of code are enough to add LyricExtender events for
> every syllable by default.

Yes. In fact, it's more straightforward to add it here than with the 
extra music function.
Not sure how a context property would come into play here; I guesss 
that'd mean that make-lyric-event branches on a variable named, say, 
autoAddExtenders, and adds an ExtenderEvent if and only if it is set to 
#t? Not sure how to code that part, but it seems plausible that we can 
make that work.

> Of course we  would need to disable the warning about more than one
> extender event.

And we might need to offer a way to remove a LyricExtender event. Unless 
we go the radical route and ...

> But do we want to enable lyric extenders by default?

... have them enabled by default, get rid of ExtenderEvent entirely, and 
just assume it's there for every syllable, unless there is a HyphenEvent 
(any use case for hyphen + extender?). If a user doesn't want it, we 
need to provide a function \extenderOff (that translates, e.g., to 
\override LyricExtender.stencil = ##f).
Only thing to consider there: We'd need a "stop sign" for extenders that 
shall only extend to some point in a _ _ _ sequence, as required in a 
divisi lyrics setting.


Cheers,
Alexander