% code-page.tex: the examples load it before \documentclass. The illustration goes on the first page, and
% the last pages show the code of the example: the lines that follow \input{code-page}.
\PassOptionsToClass{multi=page}{standalone}
\AddToHook{class/standalone/after}{\RequirePackage{fvextra}}
\AddToHook{class/beamer/after}{\RequirePackage{fvextra}}
\ExplSyntaxOn
\int_new:N \g__codepage_first_int
\ior_new:N \g__codepage_ior
\cs_new_protected:Npn \__codepage_find: {
	\int_zero:N \l_tmpa_int
	\ior_open:Nn \g__codepage_ior {\c_sys_jobname_str .tex}
	\ior_str_map_inline:Nn \g__codepage_ior {
		\int_incr:N \l_tmpa_int
		\str_if_in:nnT {##1} {{code-page}}
			{\int_gset:Nn \g__codepage_first_int {\l_tmpa_int + 1} \ior_map_break:}
	}
	\ior_close:N \g__codepage_ior
}
\cs_new_protected:Npn \__codepage_code:n #1 {
	\VerbatimInput[fontsize = #1, breaklines, tabsize = 4, firstline = \int_use:N \g__codepage_first_int]
		{\c_sys_jobname_str .tex}
}
\AddToHook{begindocument/before}{\__codepage_find:}
\AddToHook{begindocument/end}{
	\cs_if_exist:cTF {ver@beamer.cls} {} {\begin{page}\ignorespaces}
}
\AddToHook{enddocument}{
	\cs_if_exist:cTF {ver@beamer.cls}
		{
			\setbeamertemplate{frametitle~continuation}{}
			\begin{frame}[allowframebreaks]{The~code~of~this~presentation}
				\__codepage_code:n {\tiny}
			\end{frame}
		}
		{
			\unskip
			\end{page}
			\standaloneconfig{varwidth = false}
			\begin{page}
				\begin{minipage}{16cm}\__codepage_code:n {\small}\end{minipage}
			\end{page}
		}
}
\ExplSyntaxOff