[NTG-context] Setting and measuring boxes TeX/Lua

[Hans Hagen]

On 11/25/2020 10:28 PM, Jano Kula wrote:
> Hello Hans!
> 
> On Wed, 25 Nov 2020 at 21:25, Hans Hagen <j.hagen at xs4all.nl 
> <mailto:j.hagen at xs4all.nl>> wrote:
> 
>     \startluacode
>     context.stepwise (function()
>           context.step()
>     end)
>     \stopluacode
> 
> 
> Thank you very much!
> 
> I was trying context.stepwise several times (and \dowithnextbox, 
> \nextboxht and other things). I bet there was no example of empty 
> context.step().
> 
> The usage was: stepping in TeX end with 
> context.step("\\texcommands\\with\\doubleslashes") without leaving Lua.
> What is the purpose of empty context.step()? Knocking on TeX's door?
no, kind of quit, goto tex and then pickup again (coroutine magic)

(this mechanism is already kind of old, there are also other cheats 
possible)

Hans

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