Number of pages in pdf

[ggrothendieck]

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It would be nice if there were a function to return the number of pages in a pdf since that can be needed for some calculations. This is already possible using pdftk but is a bit verbose. See https://stackoverflow.com/questions/72289280/split-pdf-files-in-multiples-files-every-2-pages-in-r/72290330#72290330

[yihui]

You can use qpdf::pdf_length(). Thanks for the suggestion, though!

[ggrothendieck]

The link in my message does point that out but the point is that pdftk itself can do it but it is onerous to access it.

[yihui]

Okay, then if anyone wants to contribute a PR, I'll be happy to merge it (although it seems to be beyond the scope of this animation package). Thanks!