[luatex] callbacks in luatex 0.89

[Philipp Gesang]

···<Datum: Friday, 12. February 2016>···<Von: Ulrike Fischer>···

> Am Fri, 12 Feb 2016 19:13:51 +0100 schrieb Philipp Gesang:
> 
> >> This works fine in context but not with plain or latex in a current
> >> texlive, I get a "metric data not found or bad" error.
> > 
> > We don’t have a handler for ``.lua`` files. (Though improving the
> > error message is on my agenda, Context being the role model as
> > usual =) )
> 
> Well if I could make a wish: I can live with not so good error
> messages. I would prefer if the documentation would improve in the
> realm "what can we do to manipulate fonts". I would love to see
> examples about "how to reencode a font", "how to change the kerning
> of a char", "how to add a ligature", "how to pull a missing glyph
> from another font"

That’s stuff for a tutorial section or a wiki.

>                    -- naturally in a way that is "safe" and
> "official" and can e.g. be used in a package. 

We’ll see about the “safe” and “official” parts once Luatex
reaches 1.x. Of course concrete proposals for extending the
Luaotfload API are always welcome.

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