[luatex] \noligs

[Hans Hagen]

On 2/17/2017 6:21 PM, David Carlisle wrote:
> According to the manual \noligs taks an integer and suppresses
> ligatures when node lists are being built.
>
> There's no example and no information about what the integer was supposed to be.
>
> I guessed the font id or 0/1 true false but nothing seemed to have any effect.
>
> Are there any examples of the correct usage of this command?
>
> I tried with tfm fonts as
>
> \font\rmm="cmr10" at 20pt
>
> {\rmm ffind ffish ffood}
>
> {\rmm \noligs\fontid\font ffind ffish ffood}
>
> {\rmm \noligs0 ffind ffish ffood}
>
> {\rmm \noligs1 ffind ffish ffood}

it's a bit of old junk staying around (for now) it is supposed to 
suppress ligs in math with traditional fonts .. not really advocated 
features

> \bye
>
> or with OpenType fonts by changing the first line to
>
> \input{luaotfload.sty}
> \font\rmm="[lmroman10-regular]:" at 20pt
>
> but all lines looked the same and had ff and ffi ligatures.

the opentype / unicode way is to inject a zwj or so

Hans

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