% Copyright 2003--2007 by Till Tantau
% Copyright 2010 by Vedran Mileti\'c
% Copyright 2015 by Vedran Mileti\'c, Joseph Wright
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file LICENSE.md for more details.

\newif\ifbeamerseminar@accumulated
\beamerseminar@accumulatedfalse

\DeclareOption{accumulated}{\beamerseminar@accumulatedtrue}
\ProcessOptions


\newcount\beamerseminar@overlay

\def\overlay#1{%
  \beamerseminar@overlay=#1\relax%
  \advance\beamerseminar@overlay by1\relax%
  \ifbeamerseminar@accumulated%
    \expandafter\onslide\expandafter<\the\beamerseminar@overlay->%
  \else%
    \expandafter\onslide\expandafter<\the\beamerseminar@overlay>%
  \fi%
  \aftergroup\beamerseminar@endoverlay\ignorespaces}
\def\beamerseminar@endoverlay{%
  \ifbeamerseminar@accumulated%
    \expandafter\onslide\expandafter<\the\beamerseminar@overlay->%
  \else%
    \expandafter\onslide\expandafter<\the\beamerseminar@overlay>%
  \fi}

\newif\ifbeamerseminar@starred
\newenvironment{slide}[1][]{%
  \beamerseminar@starredfalse
  \ifbeamer@inframe%
    \beamerseminar@overlay=1\bgroup\overlay{0}%
  \else%
    \frame[containsverbatim]\bgroup%
  \fi}
  {\egroup}
\newenvironment{slide*}[1][]{\begin{slide}\beamerseminar@starredtrue}{\end{slide}}

\newcommand{\newslide}{%
  \ifbeamerseminar@starred%
    \end{slide*}\begin{slide*}%
  \else%
    \end{slide}\begin{slide}%
  \fi}

\beamerseminar@overlay=1

\def\blue{\color{blue}}
\def\red{\color{red}}
\def\green{\color{green}}

\def\ptsize#1{}

\newif\ifarticle
\articlefalse
\newif\ifslidesonly
\slidesonlytrue
\newif\ifslide
\slidetrue
\newif\ifportrait
\portraitfalse
\newif\ifcenterslides
\centerslidestrue
\newdimen\semin
\newdimen\semcm

\semin=.5in
\semcm=.5cm

\mode<article>{\articletrue\slidefalse\slidesonlyfalse}
