[NTG-context] fixing kerning and substitutions

[Florian Grammel <florian.grammel@gmail.com>]

I am trying to reuse code of a project from 2017 with TL23 context. (Other questions probably coming up...)

Back then I used font handlers to fix some smaller problems in the font, i.e. a wrongly placed small capital and missing kerning for the small caps.

The following code works with context 2017.04.27 01:00 MKIV beta but has stopped having any effect using recent context (2023.05.05 18:36 LMTX).
There are no error messages.

Has the syntax changed? Or is the functionality dropped completely?

I was also wondering why it has never been working to adjust the kerning for the regular letters, e.g. "A" and "V" in the example, neither in 2017 nor today.

Thanks a lot in advance!
Florian.








\definefontfamily     [mainface] [serif] [Palatino Linotype] [oldstyle]

\setupbodyfont [mainface]



%\feature[+][oldstyle]
%\feature[+][kernup]



%works with Context beta from 2017, doesn't work with TL 2023
\directlua{
fonts.handlers.otf.addfeature
	{
    name = "smcp",
    type = "alternate",
    data =
    	{
            ['eth'] = 'Eth.ordn' ,
%            ['k.smcp'] = 'Ķ' ,
        },
	}
}

%works for the smcp with Context beta from 2017, doesn't work for the regular capital letters
%doesn't work at all with Context TL 2023
\directlua
{
 fonts.handlers.otf.addfeature 
  {
    name = "kern",
    type = "kern",
    data = 
        {
            ["A"] = { ["V"] =  1500 },
            ["P"] = { ["Æ"] =  1500 },
            ["a.smcp"] = { ["s.smcp"] =  1500 },
         },
  }
 }
 



\startdocument


AVAPÆV

þýðask

{\sc þýðask}

123



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