[luatex] Documentation improvement about open_read_file callbacks and readers

[luigi scarso]

On Fri, May 6, 2022 at 10:50 PM Jérôme LAURENS <
jerome.laurens at u-bourgogne.fr> wrote:

> The documentation about readers (p 172 for v1.15) is
>
> ```
> Your function should return either a string or nil. The value nil signals
> that the end of file has
> occurred, and will make TEX call the optional close function next.
>
> ```
> This is partly exact. If the reader returns nil since the very first call,
> then it is called once again and only then the close function is eventually
> called. The reader is always called at least twice. It is worth mentioning
> because it may be counterintuitive.
>
>
(sorry for the delay)
For sake of completeness,  can you add an example ?



-- 
luigi
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