Interesting.

Here is a an example that sort of works, Variant 1:

\definefontfamily[english] [rm] [ebgaramond] [features={default, dlig=no}]
\setupbodyfont[english,10pt]
\starttext

Variant 1:
Does this look like EBGaramond?

fi fl ffi ffl ct st
\stoptext


However, it turns of *all* the ligatures.

Here is an example that works as expected, Variant 2:

\definefontfeature[english][dlig=no]
\definefontfamily[ebgaramond] [rm] [EB Garamond]
                 [features={default,english}]
\setupbodyfont[ebgaramond,10pt]

\starttext

Variant 2:
Does this look like EBGaramond?

fi fl ffi ffl ct st
\stoptext


It turns off just the ct and st ligatures.

I've attached the generated PDF files for both variants.


On Wed, Dec 2, 2020 at 1:23 PM Pablo Rodriguez <oinos@gmx.es> wrote:

> On 12/2/20 6:56 PM, T. Kurt Bond wrote:
> > Ah, ok.
> >
> > Here is a minimal NONWORKING example: the resulting PDF shows the ct and
> > st ligatures.  What commands should I use to turn them off?
>
> Hi Kurt,
>
> here you have the sample that should work:
>
>   %~ \definefontfamily[ebgaramond] [rm] [ebgaramond]
>
>     %~ [features={default,dlig=no}]
>
>   \definefontfeature[english][dlig=no]
>
>   \definefontfamily[ebgaramond] [rm] [EB Garamond]
>
>     [features={default,english}]
>
>   \setupbodyfont[ebgaramond,10pt]
>
>   \starttext
>
>   ct st
>
>   \stoptext
>
> BTW, on my system the default doesn’t get discretionary ligatures.
>
> Your sample didn’t work because the identifier for \definefontfamily
> (english) was different from the one used in \setupbodyfont. (If they
> don’t match, it cannot work.)
>
> Another cleaner approach is to define font features to invoke them in
> \definefontfamily. This method seems cleaner to me.
>
> I hope it helps,
>
> Pablo
> --
> http://www.ousia.tk
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-- 
T. Kurt Bond, tkurtbond@gmail.com, https://tkurtbond.github.io