Extracting two last page from a beamer pdf respectif the original format

Question

I want to extract the two or three last pages from a beamer produced pdf respecting the original format.

I have no idea how to select the two last pages and witch documentclass to use to respect the original format : both beamer and article go wrong.

\documentclass{article}
\usepackage{pdfpages}
\begin{document}
\includepdf[pages=last]{file.pdf}
\end{document}

As far as I can see, there is no interface to access the last page number. — egreg, Jul 17 '22 at 22:29
As pdfpages knows the last page and last-1 lists all the pages in revers order, I try to know if there is some thing as : last - (last-1). — Tarass, Jul 17 '22 at 22:42
With a fresher mind after a night's sleep, I remembered I already solved the problem. — egreg, Jul 18 '22 at 08:33

Paul Gaborit · Accepted Answer · 2022-07-18T23:48:53.187

Here is a solution:

\documentclass{article}
\usepackage{pdfpages}
\usepackage{xparse}
\usepackage{l3graphics}
\ExplSyntaxOn
\NewDocumentCommand\settotalpagestomacro{mm}{\graphics_get_pagecount:nN {#1}#2}
\ExplSyntaxOff
\usepackage{xfp}
\NewDocumentCommand\includelastpages{O{1}m}{%
  \bgroup%
  \settotalpagestomacro{#2}\lastpage%
  \edef\prevlastpage{\fpeval{max(1,\lastpage-#1+1)}}%
  \includepdf[pages=\prevlastpage-\lastpage,fitpaper]{#2}%
  \egroup%
}
\begin{document}
\includelastpages[2]{file1.pdf}
\includelastpages[4]{file2.pdf}
\end{document}

The \settotalpagestomacro uses recent version of l3graphics to get number of pages (see this answer Get number of pages of external PDF).

The fitpaper option adjusts the paper size to the one of the inserted document.

The \includelastpages macro includes the last pages from a PDF file. The optional argument defines the number of pages (default value: 1).

Extracting two last page from a beamer pdf respectif the original format

1 Answers1