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% vim:ft=plaintex:
%
% Written and (C) by Jérôme Lelong <jerome.lelong@gmail.com>
% 2007 - 2016
%
% This program is free software; you can redistribute it and/or modify it
% under the terms of the GNU General Public License as published by the
% Free Software Foundation; either version 3 of the License, or (at your
% option) any later version.
%
% This program is distributed in the hope that it will be useful, but
% WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
% General Public License for more details.
%
% You should have received a copy of the GNU General Public License along
% with this program. If not, see <http://www.gnu.org/licenses/>.
%
% This small piece of code fixes the frame numbering in beamer when using
% an appendix such that the slides of the appendix are not counted in the
% total framenumber of the main part of the document. The total
% framenumber counter is reset to 0 and starts counting again when
% entering the appendix.
%
% Usage: \usepackage{appendixnumberbeamer}
% and declare the appendix as usual using the \appendix command.
\makeatletter
\let\appendixtotalframenumber\empty
\def\mainend{-1}
\let\appendixorig\appendix
% Redefine the \appendix command:
% - Reset the framenumber counter
% - Freeze the total framenumber for this first part of the document
\def\appendix{
\xdef\mainend{\theframenumber}
\immediate\write\@auxout{\string\global\string\@namedef{mainendframenumber}{\mainend}}
\appendixorig
\gdef\inserttotalframenumber{\appendixtotalframenumber}%
\setcounter{framenumber}{0}
}
% To be called at the end of the document to fix the total framenumber in the
% main document and in the appendix.
\def\pageatend{
\xdef\appendixend{\theframenumber}
\ifnum\mainend>0%
\immediate\write\@auxout{\string\global\string\@namedef{appendixtotalframenumber}{\appendixend}}%
\immediate\write\@auxout{\string\global\string\@namedef{inserttotalframenumber}{\mainend}}%
\immediate\write\@auxout{\string\@writefile{nav}{\noexpand \headcommand {%
\noexpand \def\noexpand \inserttotalframenumber{\mainend}}}}%
\immediate\write\@auxout{\string\@writefile{nav}{\noexpand \headcommand {%
\noexpand \def\noexpand \appendixtotalframenumber{\appendixend}}}}%
\else
\fi
}
\AtEndDocument{\pageatend}
\makeatother
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