On Wed, Feb 23, 2022 at 12:00 AM Hans Hagen via nt= g-context <ntg-context@ntg.nl&= gt; wrote:

On 2/= 19/2022 4:59 PM, Stefan Nedeljkovic via ntg-context wrote:
> Dear list,
>
> I'm using the typeface Neacademia Text, and I'm trying to conf= igure it
> to the specifics of the Serbian language. I want to replace the usual =
> form of the lowercase cyrillic=C2=A0letter BE with the traditional Ser= bian
> form. I opened the font file in Font Forge and looked up the glyph inf= o.
> Here is what I tried and what failed:
>
> \startluacode
> fonts.handlers.otf.addfeature {
> name =3D "besub",
> type =3D "substitution",
> data =3D {
> ["uni0431"] =3D "uni0431.SRB.alt"
> }
> }
> \stopluacode
>
> \definefontfeature[default]
>=C2=A0 =C2=A0 [mode=3Dnode,kern=3Dyes,
>=C2=A0 =C2=A0 liga=3Dyes,dlig=3Dyes,
>=C2=A0 =C2=A0 calt=3Dyes,ss03=3Dyes,
>=C2=A0 =C2=A0 case=3Dyes,ccmp=3Dyes,
>=C2=A0 =C2=A0 locl=3Dyes,script=3Dcyrl,language=3Dsrb,
>=C2=A0 =C2=A0 besub=3Dyes]
>
> No luck using hex codes either:
>
> \startluacode
> fonts.handlers.otf.addfeature {
> name =3D "besub",
> type =3D "substitution",
> data =3D {
> [0x1ab] =3D 0x3f8
> }
> }
> \stopluacode"uni0431"
>
> Interestingly the single substitutions from page 175 of the fonts manu= al
> seem to work just fine.
> Any help is appreciated.
hard to say but you enabel quite some features so probably uni0431 is
already replaced .. maybe

=C2=A0 =C2=A0 =C2=A0prepend =3D true,

helps

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