How does lua callback work?

How does lua callback work?

[Sylvain Hubert]

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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?

Thanks!

Best,
Sylvain

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Re: 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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Re: How does lua callback work?

[Sylvain Hubert]

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On Wed, 4 Nov 2020 at 19:25, Hans Hagen <j.hagen@xs4all.nl> wrote:

> no callback
>
> \checkcharactersinfont
>
> will report missing chars
>
Thanks, but this command doesn't seem to add any information on top of the
missing characters that context already reported without the command.

My motivation was to write a module that suggests fallback fonts to the
user, ideally at the moment of encountering a missing character, but at the
end of processing is still acceptable.

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