[NTG-context] modify kern between two glyphs

[mf]

Il 05/04/22 13:54, Hans Hagen via ntg-context ha scritto:
> On 4/5/2022 1:45 PM, mf via ntg-context wrote:
> 
>> It's defined in typo-fkr.lua, but I can't understand what parameters 
>> to pass and whether it's the right macro. It looks like it's not.
> look at the extension examples in the test suite: you can define a kern 
> pair positioning feature than you enable for just that font
> 

Thanks Hans, here's the working MWE:

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\mainlanguage[it]

% from http://www.pragma-ade.com/context/latest/cont-tst.zip
% file doc/context/tests/mkiv/fonts/extensions-001.tex
\startluacode
     fonts.handlers.otf.addfeature {
         name = "ktest",
         type = "kern",
         data = {
             [ '’' ] = { [ '4' ] = -100 },
         }
     }
\stopluacode
\definefontfeature[ktest][ktest=yes]

\starttext

Default: «Questo è successo nel ’48».

Desired: «Questo è successo nel ’\kern-.1em 48».

Solved: \feature[+][ktest]«Questo è successo nel ’48».

\stoptext
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Massi