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%% flushend.sty
%% Copyright 1997 Sigitas Tolu\v sis
%% VTeX Ltd., Akademijos 4, Vilnius, Lithuania
%% e-mail sigitas@vtex.lt
%% http://www.vtex.lt/tex/download/macros/
%%
% This program can redistributed and/or modified under the terms
% of the LaTeX Project Public License Distributed from CTAN
% archives in directory macros/latex/base/lppl.txt; either
% version 1 of the License, or (at your option) any later version.
%
% PURPOSE: Balanced columns on last page in twocolumn mode.
%
% SHORT DESCRIPTION:
%
% \flushend (loaded by default)
% ---------
% Switches on column balancing at last page
%
% \raggedend
% ----------
% Switches off column balancing at last page
%
% \atColsBreak={#1}
% ------------------
% Adds #1 in place of original column break (without balancing)
% Example: \atColsBreak{\vskip-2pt}
%
% \showcolsendrule
% ----------------
% Adds rule to the bottom of columns (just for debugging)
%
% P.S. To stretch right column by #1 add command \vskip-#1 just before
% command \end{document}.
% TO shrink right column by #1 add command \vskip#1 just before
% command \end{document}.
% Example: \vskip-10pt
% \end{document}
%
% \changes{1997/05/16}{first version}
% \changes{1997/09/09}{support for compatibility with cuted.sty}
% \changes{1997/10/01}{\vipersep changed to \stripsep for compatibility with cuted.sty}
%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{flushend}[1997/10/01]
%
\newbox\@aaa
\newbox\@ccc
\@ifundefined{@viper}{\newbox\@viper}{}
\@ifundefined{hold@viper}{\newbox\hold@viper}{}
\newtoks\atColsBreak \atColsBreak={}
\newdimen\@extra@skip \@extra@skip\z@
\newdimen\@nd@page@rule \@nd@page@rule\z@
\def\last@outputdblcol{%
\if@firstcolumn
\global \@firstcolumnfalse
\global \setbox\@leftcolumn \box\@outputbox
\else
\global \@firstcolumntrue
\if@lastpage
\@tempdima\ht\@leftcolumn
\splittopskip\topskip\splitmaxdepth\maxdepth
\setbox\@tempboxa\vbox{%
\unvbox\@leftcolumn\setbox0\lastbox\unskip%
\the\atColsBreak%
\unvbox\@outputbox\setbox0\lastbox\unskip}%
\@tempdimb .5\ht\@tempboxa%
\loop
\setbox\@aaa\copy\@tempboxa%
\setbox\@ccc\vbox to\@tempdimb{%
\vsplit\@aaa to\@tempdimb\vss\vsplit\@aaa to\@tempdimb}%
\wlog{Extra height:\the\ht\@aaa\space when \the\@tempdimb}%
\ifvoid\@aaa \else \advance\@tempdimb 1pt \repeat%
\loop
\setbox\@aaa\copy\@tempboxa%
\setbox\@ccc\vbox to\@tempdimb{%
\vsplit\@aaa to\@tempdimb\vss}%
\wlog{(2)Left:\the\ht\@ccc\space Right:\the\ht\@aaa\space Output:\the\@tempdimb}%
\ifdim \ht\@ccc<\ht\@aaa \@tempdimb \the\ht\@aaa \repeat%
\wlog{- LAST -^^JExtra skip:\the\@extra@skip^^JLeft:\the\ht\@ccc^^JRight:\the\ht\@aaa^^JOutput:\the\@tempdimb}%
\setbox\@ccc\vbox to\@tempdimb{%
\vsplit\@tempboxa to\@tempdimb\vss}%
\setbox\@leftcolumn\vbox to\@tempdima{%
\vbox to\@tempdimb{\unvbox\@ccc}%
\hrule\@height\@nd@page@rule%
\vss}%
\setbox\@outputbox\vbox to\@tempdima{%
\vbox to\@tempdimb{\unvbox\@tempboxa\vfilneg\vskip\@extra@skip}%
\hrule\@height\@nd@page@rule%
\vss}%
\setbox\@outputbox \vbox {%
\hb@xt@\textwidth {%
\hb@xt@\columnwidth {%
\box\@leftcolumn \hss}%
\hfil
\vrule \@width\columnseprule
\hfil
\hb@xt@\columnwidth {%
\box\@outputbox \hss}%
}%
}%
\else
\setbox\@outputbox \vbox {%
\hb@xt@\textwidth {%
\hb@xt@\columnwidth {%
\box\@leftcolumn \hss}%
\hfil
\vrule \@width\columnseprule
\hfil
\hb@xt@\columnwidth {%
\box\@outputbox \hss}%
}%
}%
\fi
\ifvoid\hold@viper
\else
\setbox\@outputbox \vbox{\box\hold@viper\box\@outputbox}%
\fi
\@combinedblfloats
\@outputpage
\begingroup
\@dblfloatplacement
\@startdblcolumn
\@whilesw\if@fcolmade \fi
{\@outputpage
\@startdblcolumn}%
\ifvoid\@viper
\else
\global\setbox\@viper\vbox{%
\vskip-\stripsep\unvbox\@viper}\@viperoutput
\fi
\endgroup
\fi
}
\let\prev@enddocument\enddocument
\newif\if@lastpage \@lastpagefalse
\def\enddocument{\global\@lastpagetrue\let\@outputdblcol\last@outputdblcol\prev@enddocument}
\def\raggedend{\global\let\enddocument\prev@enddocument}
\def\flushend{\gdef\enddocument{\global\@lastpagetrue\let\@outputdblcol\last@outputdblcol\prev@enddocument}}
\def\showcolsendrule{\global\@nd@page@rule=.4pt}
\endinput
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