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\unprotect
% clean up footnotes to notes
% We need to set the \dimen globally since we are in the
% OTR. Unfortunately this interferes with local settings,
% although we may assume that they will not cross page
% boundaries.
\def\OTRSETcheckcontent
{\bgroup
\donefalse
\def\OTRSETcheckcontent##1%
{\setbox\scratchbox##1\recurselevel
\setbox\scratchbox\vbox{\unvbox\scratchbox}%
\ifdim\ht\scratchbox>\zeropoint\donetrue\fi}%
\dorecurse{\nofcolumns}
{\OTRSETcheckcontent\columngettextbox
\OTRSETcheckcontent\columngetfootbox
\OTRSETcheckcontent\columngettopbox
\OTRSETcheckcontent\columngetbotbox}%
\ifdone\egroup\donefalse\else\egroup\donetrue\fi}
\def\OTRSETgetcolumntextheight#1% max - boven - top
{\scratchdimen=\OTRSETgetparameter\c!maxhoogte#1%
\advance\scratchdimen -\OTRSETgetparameter\c!bovenoffset#1%
\advance\scratchdimen -\ht\columntopbox#1%
\advance\scratchdimen -\getvalue{\??mc\number\mofcolumns-f}%
\advance\scratchdimen -\ht\columnbotbox#1} % not used
\def\OTRSETgetcolumnnaturalheight#1% max - boven - top
{\setbox\scratchbox\vbox{\unvcopy\columntextbox#1}%
\scratchdimen\ht\scratchbox
\advance\scratchdimen \OTRSETgetparameter\c!bovenoffset#1%
\advance\scratchdimen \ht\columntopbox#1%
\advance\scratchdimen -\getvalue{\??mc\number\mofcolumns-f}%
\advance\scratchdimen \ht\columnbotbox#1} % not used
\def\OTRSETdobalance% splitten in met en zonder footnotes
{\bgroup
\maxdeadcycles=1000
% collect content and notes
\bgroup
\OTRSEToutput
{\global\setbox1\vbox{\unvbox\normalpagebox}%
\global\setbox3\vbox{\unvbox\footins}}%
\vbox{\toonstruts\strut}\vskip-\lineheight % makes footnotes flush
\eject
\global\collectingcontentfalse
% check for footnotes only
\ifdim\ht1<\topskip % real dirty
\global\setbox1=\vbox{}
% fix height of first line
\ifdim\ht3>\!!zeropoint
\global\setbox3\vbox
{\setfootnotebodyfont
\kern-\strutht
\kern\topskip
\unvbox3}
\fi
% prepare trial box
\global\setbox5\vbox
{\ifdim\ht1>\zeropoint
\unvcopy1 \ifdim\ht3>\zeropoint \kern\skip\footins \fi
\fi
\ifdim\ht3>\zeropoint \unvcopy3 \fi}
\egroup
% erase old stuff
\columnerasetextboxes
\columnerasefootboxes
% prepare floats
\OTRSETdotopinsertions
\OTRSETdobotinsertions % not used can be removed
% calculate available space
\!!heighta\zeropoint % available total height
\dorecurse{\nofcolumns}
{\OTRSETgetcolumntextheight\recurselevel
\OTRSETcalculatelines\scratchdimen
\advance\!!heighta \scratchdimen}
% quick check
\ifdim\ht5>\!!heighta
% use normal routine
\columnerasetextboxes
\columnerasefootboxes
% TEMP, TODO, FORCE NEXT PASS !
\unvbox1
\unvbox3
\doglobal\addtocommalist{-\realfolio}\OTRSETbalancinglist
\donefalse
%\writestatus\m!columns{no balancing, text overflows height}%
\else\ifdim\ht5>\zeropoint \relax
% some text and/or notes
\donetrue
\else
\donefalse
\dorecurse\nofcolumns
{\ifdim\ht\columntopbox\recurselevel>\zeropoint \donetrue \fi}%
\ifdone
% no text and notes, but figures
\else
% no text, no notes, no figures
\doglobal\addtocommalist{-\realfolio}\OTRSETbalancinglist
\writestatus\m!columns{no balancing, nothing to be placed}%
\fi
\fi\fi
\ifdone
\ifdim\ht5>\zeropoint \relax
% balancing text and notes
%\writestatus\m!columns{text may fit, balancing}%
\newcounter\loopcounter
\newcounter\balancinglines
\doloop
{\increment\loopcounter\relax
% initialize
\columnerasetextboxes
\columnerasefootboxes
\setbox0=\copy5
\splittopskip\topskip
% pre-split loop and quality calculation
%\writestatus\m!columns{pass \loopcounter: correction -\balancinglines}
\dorecurse\nofcolumns
{\OTRSETgetcolumntextheight\recurselevel
\OTRSETcalculatelines\scratchdimen
\!!heightc\scratchdimen
\ifnum\recurselevel<\nofcolumns
\advance\!!heightc -\balancinglines\lineheight
\fi
\columnsettextbox\recurselevel\vsplit0 to \!!heightc}
% just one method
\OTRSETgetcolumnnaturalheight1 \dimen4\scratchdimen
\OTRSETgetcolumnnaturalheight\nofcolumns \dimen6\scratchdimen
%\writestatus\m!columns{first column: \the\dimen4}%
%\writestatus\m!columns{last column: \the\dimen6}%
\ifdim\dimen4=\dimen6
\donetrue % perfect balance
\else\ifdim\dimen4>\dimen6
\donefalse % not yet good enough
\increment\balancinglines % try again
\edef\balancingcount{\the\!!counta}
\else
\donetrue % worse balance
\ifnum\balancinglines>0 % take previous
\decrement\balancinglines
\fi
\fi\fi
% extra check
% \ifdim\ht0>\zeropoint\relax \donefalse \fi
% another check
\ifdone
%\writestatus\m!columns{balancing finished in pass \loopcounter}%
\else \ifnum\loopcounter>100 \donetrue
%\writestatus\m!columns{balancing aborted after pass \loopcounter}%
\else
%\writestatus\m!columns{balancing continued after pass \loopcounter}%
\fi \fi
% final balancing pass
\ifdone
\setbox0\copy1
\setbox2\copy3
\columnerasetextboxes
\columnerasefootboxes
\dorecurse\nofcolumns
{\OTRSETgetcolumntextheight\recurselevel
\OTRSETcalculatelines\scratchdimen
\!!heightc\scratchdimen
\ifnum\recurselevel<\nofcolumns
\advance\!!heightc -\balancinglines\lineheight
\fi
% split off text
\ifdim\ht0>\zeropoint
\columnsettextbox\recurselevel\vsplit0 to \!!heightc
\setbox4\vbox{\unvcopy\columntextbox\recurselevel}
\advance\!!heightc -\ht4
\ifdim\ht0>\zeropoint
\columnsettextbox\recurselevel\box4
\advance\!!heightc \skip\footins
\fi
\fi
% split off footnotes
\ifdim\ht0>\zeropoint\relax \else
\ifdim\ht2>\zeropoint\relax
\setbox4\vsplit2 to \!!heightc
\setbox\footins=\vbox{\unvbox4} % ugly and dirty trick
\ifdim\ht\columntextbox\recurselevel=\zeropoint\relax
\columnsettextbox\recurselevel\hbox
{\raise\strutdp\hbox % ugly but needed
{\setfootnotebodyfont % both these moves
\lower\strutdp\hbox{\placebottomnotes}}}
\else
\columnsetfootbox\recurselevel\hbox{\placebottomnotes}
\fi
\fi
\fi}
\exitloop
\fi}
\else
% no reason to balance floats
\fi
\fi
\doglobal\addtocommalist{\realfolio}\OTRSETbalancinglist
\OTRSETdoflush
\fi
\egroup}
\protect \endinput
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