Re: issue with a font with no features

On 6/21/2026 2:34 PM, Pablo Rodriguez via ntg-context wrote:
> Dear list,
> 
> I have a couple of fonts (https://www.dafont.com/sv-basic-manual.font)
> which contain no GPOS/GSUB features.
> 
> I mean, the following command gives nothing as a result:
> 
>    otfinfo -f ~/many-fonts/SVBManual.ttf
> 
> But I get an error such as
> 
>    tex error       > tex error on line 6 in file :
> 
>    lua error:
>      …font-ctx.lmt:2483: attempt to index a nil value (field 'gpos')
> 
> Well, the minimal function reads on my end (font-ctx.lmt):
> 
>      function constructors.currentfonthasfeature(n)
>          local f = fontdata[currentfont()]
>          if not f then return end f = f.shared
>          if not f then return end f = f.rawdata
>          if not f then return end f = f.resources
>          if not f then return end f = f.features
>          return f and (f.gpos[n] or f.gsub[n])
>      end
> 
> I guess that lacking features is a problem with checking whether a font
> has a given feature.
> 
> I need to compile the original document ASAP. Is there an easy fix to
> make these fonts work?

here

{\definedfont[SVBasicManual.ttf] test}

just works, as does

 >mtxrun --script font --list --info --details --pattern=svbasicmanual*
mtx-fonts       |
mtx-fonts       | mapping   : svbasicmanualbold
mtx-fonts       | fontname  : svbasicmanualbold
mtx-fonts       | fullname  : svbasicmanualbold
mtx-fonts       | filename  : SVBasicManual-Bold.ttf
mtx-fonts       | family    : svbasicmanual
mtx-fonts       | weight    : bold
mtx-fonts       | style     : normal
mtx-fonts       | width     : normal
mtx-fonts       | variant   : normal
mtx-fonts       |

fwiw, otfinfo is not something you use in context

Hans

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