[NTG-context] How does lua callback work?

[Hans Hagen]

On 11/4/2020 6:14 PM, Sylvain Hubert wrote:
> Dear List,
> 
> I'm trying to intervene whenever context encounters a character that it 
> cannot render in the current font. I guess this should have something to 
> do with lua callbacks (pls correct me if I'm wrong), but the document 
> <http://www.pragma-ade.nl/general/manuals/cld-mkiv.pdf> does not seem to 
> elaborate on this.
> 
> Does anyone know how the aforementioned task can be done, or how lua 
> callbacks work in terms of the meaning of the concerned events and 
> parameters?
no callback

\checkcharactersinfont

will report missing chars


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