Otared Kavian schrieb am 14.03.2024 um 14:48:
> Dear Emmanuel,
>
> Thank you for your reply: indeed I understand your approach, which is 
> quite efficient. I am not at all good in coding, so I naively thought 
> there would be a way for your setup to retrieve the information it 
> needs from what the user is doing. Maybe once things are settled, Hans 
> and Wolfgang will have a look in the Japanese part of ConTeXt so that 
> the user can avoid to enter the setup included in the \directlua part.

There is no need for these calculations because

     1. you can create named layouts (e.g. \definelayout[kinohanmen:a4]) 
for each paper size,

     2. you can put the fontsize etc. settings in a setups block and 
load the one needed for each paper size and

     3. you can put all of them in a module which can be loaded when 
writing documents in japanese, the paper size can be passed as argument 
to the module.

Wolfgang