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%% 
%% This program is provided under the terms of the
%% LaTeX Project Public License distributed from CTAN
%% archives in directory macros/latex/base/lppl.txt.
%% 
%% Author: Mike Kaufmann
%%         m.km@gmx.de
%% 
\def\fileversion{0.1}
\def\filedate{2011/06/29}
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{beamersubframe}[\filedate\space
    v\fileversion\space reordering beamer frames]

% check for beamer class
\@ifclassloaded{beamer}{}{%
    \PackageError{beamersubframe}{%
        The package works only with the beamer class,\MessageBreak
        therefore it is not loaded.
    }{%
        The package is not loaded, because it needs the\MessageBreak
        beamer class. Continuing may lead to additional\MessageBreak
        errors because of undefined commands.
    }
    \endinput
}

\newif\if@bsf@append
\newif\if@bsf@firstline
\newtoks\sub@frame@param
\newwrite\sfr@out
\newwrite\sfr@sub

\DeclareOption{embed}{\@bsf@appendfalse}
\DeclareOption{append}{\@bsf@appendtrue}

\ExecuteOptions{embed}
\ProcessOptions*\relax

\RequirePackage{verbatim}

\def\beamer@subnum{%
    \the\c@part.\the\c@section.\the\c@subsection.\the\c@subsectionslide
}

\def\beamersubframepages#1#2#3#4#5#6{%
    \expandafter\def\csname beamer@substartpage#1.#2.#3.#4\endcsname{#5}%
    \expandafter\def\csname beamer@subendpage#1.#2.#3.#4\endcsname{#6}%
}

\def\beamer@writeslidentry@miniframes{%
    \addtocontents{nav}%
      {\protect\headcommand{%
          \protect\slideentry{\the\c@section}{\the\c@subsection}{\the\c@subsectionslide}%
          {\protect\@nameuse{beamer@substartpage\beamer@subnum}/%
           \protect\@nameuse{beamer@subendpage\beamer@subnum}}{\lastsubsection}{\the\c@part}}}%
}

\def\beamer@writeslidentry@navbar{%
  \expandafter\beamer@ifempty\expandafter{\beamer@framestartpage}{}% does not happen normally
  {%else
    \addtocontents{nav}%
      {\protect\headcommand{% 
        \protect\beamer@framepages{\beamer@framestartpage}{\beamer@frameendpage}}}%
    \immediate\write\sfr@sub{\string\beamersubframepages%
                             {\the\c@part}{\the\c@section}{\the\c@subsection}%
                             {\the\c@subsectionslide}{\beamer@framestartpage}{\beamer@frameendpage}}%
    \clearpage\beamer@notesactions%
  }
}
\let\beamer@writeslidentry@orig\beamer@writeslidentry

\newcommand{\beamerrestore}[6]{%
    \setcounter{part}{#1}%
    \setcounter{section}{#2}%
    \setcounter{subsection}{#3}%
    \setcounter{subsectionslide}{#4}%
    \def\insertsectionhead{#5}%
    \def\insertsubsectionhead{#6}%
}

\if@bsf@append
    \newenvironment{subframe}{%
        \immediate\write\sfr@out{\string\beamerrestore{\the\c@part}{\the\c@section}%
                {\the\c@subsection}{\the\c@subsectionslide}{\insertsectionhead}{\lastsubsection}}
        \addtocounter{subsectionslide}{1}%
        \@bsf@firstlinetrue
        \let\do\@makeother\dospecials\catcode`\^^M\active
        \def\verbatim@processline{%
            \if@bsf@firstline
                \immediate\write\sfr@out{\string\begin{frame}\the\verbatim@line}%
                \@bsf@firstlinefalse
            \else
                \immediate\write\sfr@out{\the\verbatim@line}%
            \fi
        }%
        \verbatim@}{\immediate\write\sfr@out{\string\end{frame}^^J}%
        \beamer@writeslidentry@miniframes
    }
\else
    % problem here: adding ``environment=subframe'' to the options
    \def\sub@frame@#1\@@end{\begin{frame}#1}
    \def\sub@@@frame#1#2#3\@@end{%      processing for one optional argument
        \def\@tempa{#2}\def\@tempb{<}%
        \ifx\@tempa\@tempb\relax%       test for default overlay spec
            \sub@frame@param={#1[#2#3][environment=subframe]}%
        \else
            \sub@frame@param={#1[environment=subframe,#2#3]}%
        \fi
    }
    \def\sub@@frame#1#2[#3]{%
        \def\@tempa{#2}
        \ifx\@tempa\@empty%         this means: no default overlay spec and no options
            \sub@frame@param={#1[environment=subframe]}%
        \else
            \def\@tempb{#3}
            \ifx\@tempb\@empty%     this means: one optional argument
                \sub@@@frame{#1}#2\@@end
            \else%                  both, default overlay spec and options present
                \sub@frame@param={#1[#2][environment=subframe,#3]}%
            \fi
        \fi
        \expandafter\sub@frame@\the\sub@frame@param\@@end
    }
    \def\sub@frame#1#2{%
        \@ifnextchar[{\sub@@frame{#1}{#2}}{\sub@@frame{#1}{#2}[]}%
    }
    \newenvironment<>{subframe}[1][]{%
        \sub@frame@param={}%
        \sub@frame{#2}{#1}}{\end{frame}}
\fi

\newcommand{\appendsubframes}{%
    \if@bsf@append
        \let\beamer@writeslidentry\beamer@writeslidentry@navbar
        \immediate\closeout\sfr@out
        \input{\jobname.sfr}
%        \immediate\openout\sfr@out\jobname.sfr
        \let\beamer@writeslidentry\beamer@writeslidentry@orig
    \fi
}

\AtBeginDocument{%
    \InputIfFileExists{\jobname.sfp}{}{}%
    \if@bsf@append
        \immediate\openout\sfr@out\jobname.sfr\relax
        \immediate\openout\sfr@sub\jobname.sfp\relax
    \fi
}
\AtEndDocument{%
    \if@bsf@append
%        \immediate\closeout\sfr@out
        \immediate\closeout\sfr@sub
    \fi
}

% simple command for user macros
\newcommand{\ifappend}[2]{\if@bsf@append #1\else #2\fi}