Re: Anybody invested in ly:make-simple-closure?

[Thomas Morley]

2015-09-24 11:10 GMT+02:00 David Kastrup <address@hidden>:
>
> ly:make-simple-closure is a powerful tool that can be used for doing a
> lot of things in connection with callbacks.  It is also utterly
> inscrutable and seriously underdocumented and it does not help that
> nobody ever bothered defining a macro preprocessing its input which
> would have obviated the need for extensive quasiquotes making for yet
> more inscrutability.
>
> It's likely that there are still LSR snippets using it

As far as I can tell, ly:make-simple-closure isn't used in any LSR-snippet.

For myself I can say I never used it. I didn't understand what it does
at first and second sight and never put in more work of deeper
investigation.

Cheers,
  Harm

> even though our
> current LilyPond code base only uses it in some very limited places
> internally (and in some outdated manuals).  I am planning on throwing it
> out altogether, preferably without replacement in the near future.  I
> think that pretty much all the stuff it has been used for can be dealt
> with using ordinary callbacks and unpure-pure-containers.
>
> While it could be used as the basis for something more user-friendly,
> I want to reorganize the pure/unpure/grob property caching mess and it
> makes more sense to think about reintroducing more convenient callback
> assembly mechanisms after I've done that.  So I think at the current
> point of time we are better off throwing it out altogether while this
> can be done at reasonable cost rather than trying to drag it through the
> reorganization.
>
> --
> David Kastrup
>
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