[NTG-context] Clipping multiple PDFs

[Aditya Mahajan]

On Mon, 22 Aug 2022, Jethro Djan via ntg-context wrote:

> 
> Thanks for the solution Pablo. It works well.
> 
> I wanted to add more pdfs (which also has many pages) and found it was easier for me to reason in the lua side of things. This is what I have at the moment:
> 
> \starttext
> \startluacode
>   local function doc(fil)
>     return fil..[[.pdf]]
>   end
> 
>   local function disppdf(fname)
>     n = 1 
>     repeat 
>       context.externalfigure({fname},{
>         page = n,
>         width = "200mm",
>         scale = "950"
>       })
>       n = n + 1
>     until n == context(context.noffigurepages)
>   end
> 
>   local pdffiles = {"ass1", "ass2", "ass3", "ass4", "ass5", "ass6", "ass7", "ass8"}
>   for index=1,#pdffiles do 
>     local f = doc(pdffiles[index])
>     context.getfiguredimensions({f})
>     disppdf(pdffiles[index])
>   end
> \stopluacode
> \stoptext
> 
> I didn’t know how to get an array (or indexed table or whatever you call it) in ConTeXt/Tex. My problem is now with context(context.noffigurepages). It doesn’t produce an integer so n is being compared to nil. Am I calling it wrong? All I want to do is call \noffigurepages from the lua side. Is there something I am missing?

For a more low-level interface to finding the number of pages, see:

https://adityam.github.io/context-blog/post/include-multi-page-pdf/

Aditya