[NTG-context] alternate to font feature file for glyph substitution ?

jfbu jfbu at free.fr
Thu Apr 28 16:08:45 CEST 2016


how should I go at the Plain TeX level about implementing
the following glyph substitution which I formerly expressed
in a font feature file:

languagesystem DFLT dflt;
languagesystem latn dflt;

feature oneb {
  sub one by one.ss01;
} oneb;

The font is Vollkorn, a Plain LuaTeX file which worked in TL2015 would be

\input luaotfload.sty
\x 123
% Local Variables:
% TeX-engine: luatex
% End:

The glyph for digit 1 is modified and picked in stylistic set 1. I don't want
to globally switch to that stylistic set, I am only interested into digit 1.

My use case is more with LuaLaTeX+fontspec, but if I am explained 
a Plain LuaTeX approach I can at least forward to Will Robertson 
who maintains fontspec and cross my fingers that it trickles down
back to me at some point via update of fontspec, or luatex, or luaotfload, 

Please CC to me as although I asked for (temporary) list inscription
I might not yet be registered.

I am aware of https://mailman.ntg.nl/pipermail/ntg-context/2016/083952.html
but can't work it out from there.


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