\lastsavedimageresourcepages in lua

Question

I am attempting to get the total number of pages of an external PDF document as a lua variable through

\saveimageresource{index.pdf}%
\the\lastsavedimageresourcepages

However, when i call the lua code, the returned value is nil.

token.get_macro('lastsavedimageresourcepages') returns nil

I also tried tex.count['lastsavedimageresourcepages'] but it throws an error.

\directlua{tex.print(tex.lastsavedimageresourcepages)} – Ulrike Fischer Oct 10 '23 at 19:10 — Ulrike Fischer, Oct 10 '23 at 19:10

score 2 · Accepted Answer · answered Oct 10 '23 at 19:08

2

You want

tex.lastsavedimageresourcepages

to access the value from Lua

answered Oct 10 '23 at 19:08

David Carlisle

Thank you. Is there a function like tex.saveimageresource also? The luatex manual does not seem to make this clear. – likethevegetable Oct 10 '23 at 20:01
@likethevegetable I think that's img.write(img.scan{ file = "foo.pdf" }) (luatex manual section 11.1.8) – David Carlisle Oct 10 '23 at 20:16

1 Answers1