% Output.tex copyright 1992 Victor Eijkhout
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%% O U T P U T %%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\@GenericConstruct{PageGrid}

\newif\if@pagegrid@installed
\ifini{\next@paragraph
   {\if@pagegrid@installed \else 
        \Wmessage{No page grid installed}\fi
   }}
\NewTrace:out
\add@PageGrid@default{\text@constructno}
\add@PageGrid@default{\has@marksyes}

\newtoks\user@overrides
\def\add@user@override#1{\append@to@list{user@overrides}{#1}}

\newif\if@nubalanceren
\newinsert\botins

%%%% Page counting
%
% \count0 is the paper counter: 
%     is increased for every \shipout in the output routine
% \count1 is the page counter:
%     you can do with it whatever you like.

% This appears to the users as if \NewCounter:Page had been done.
%
\countdef\sheet@counter=0
\csarg\countdef{\counter@name{Page}}=1 
\CounterRepresentation:Page=1
\newtoks\Page@RL %zwoeg, zwoeg!
\SetCounter:Page=1

%%%% Tests
%
\DefineTest:IsRightPage
\DefineTest:IsLeftPage
\DefineTest:IsFirstPage
\DefineTest:IsLastPage
\DefineTest:FlushBottom

%% anonieme cs'en zijn in gebruik bij opbouw en gebruik %%
% \tempdima : / klad; gebruikt voor hoofdmeting; daarna in \text@column
% \tempdimc : / klad; gebruikt voor voetmeting
% \cs@a : in gebruik door \haalitems

\def\slotpenalty{-10001}

\def\@pseudoif#1#2{\tempcounta\escapechar \noesc
    \edef\cs@e{\let\CSname{if@\string#1}\CSname{if\string#2}}\cs@e
    \escapechar\tempcounta}
\@pseudoif\IsFirstPage\true \@pseudoif\IsLastPage\true
\@pseudoif\IsRightPage\true
\@pseudoif\IsLeftPage\false

\def\leftright@setup
   {\csarg\ifodd{\counter@name{Page}}\relax 
                \IsRightPage:yes \IsLeftPage:no
          \else \IsRightPage:no  \IsLeftPage:yes
          \fi}
\def\firstpage@setup{\def\cs@a{yes}
    \edef\cs@b{\xp\get@placed\xp{\firstmark}{first@page}}
    \ifx\cs@a\cs@b \IsFirstPage:yes \else \IsFirstPage:no \fi}
\def\lastpage@setup
    {\ifnum\outputpenalty=\slotpenalty\relax 
        \Tmessage[out]{Last page}\IsLastPage:yes
     \else \IsLastPage:no
     \fi}
\def\output@setup{\let\par\@par
    \parindent\z@ \leftskip\z@ \rightskip\z@ \lineskip\z@
    \@defaulteverypar \MainFont
    \leftright@setup    \firstpage@setup    \lastpage@setup
    \@colnum\@ne \output@set@page@width
    \Tmessage[out]{Incoming text: (\the\ht\@cclv+\the\dp\@cclv) x
                   \the\wd\@cclv}
    }

%%%%%%%%%%%%%%%% Head, Foot, Body
%
% Separate boxes are allocated for the page
% head, body, and foot.
% Head and foot contain static material, the
% body contains the text. The body can be empty.
%
\newbox\page@head@box \newtoks\page@head@toks
\page@head@toks{}
\add@PageGrid@default
   {\page@head@toks={\setbox\page@head@box=\vbox\bgroup}}
\newdimen\head@height
\def\measure@head{\head@height=\ht\page@head@box
    \advance\head@height\dp\page@head@box
    \Tmessage[out]{Head measurement: \the\head@height}}

\newbox\page@foot@box \newtoks\page@foot@toks 
\page@foot@toks{}
\add@PageGrid@default{\page@foot@toks=
              {\setbox\page@foot@box=\vbox\bgroup}}
\newdimen\foot@height
\def\measure@foot{\foot@height=\ht\page@foot@box
    \advance\foot@height\dp\page@foot@box
    \Tmessage[out]{Foot measurement: \the\foot@height}}

\def\goal@height@trace
   {\tempdimb\text@height
    \multiply\tempdimb\ifnum\user@n@cols=\m@ne\n@cols\else\user@n@cols\fi
    \Tmessage[out]{Aim for  text height: \the\text@height\@space
    \ifnum\user@n@cols>\m@ne (\the\user@n@cols\@space columns;
                total height: \the\tempdimb)
    \else\ifnum\n@cols>\@ne (\the\n@cols\@space columns;
                total height: \the\tempdimb)
    \fi\fi}}

\def\report@body@measurement{
    \Tmessage[out]{Body measurement:
        (\the\ht\page@body@box+\the\dp\page@body@box) 
        x\the\wd\page@body@box}
    \ifvoid\topins\else
        \Tmessage[out]{Top inserts: \the\ht\topins+\the\dp\topins}\fi
    \ifvoid\botins\else
        \Tmessage[out]{Foot inserts: \the\ht\footins+\the\dp\footins}\fi
    }

\newbox\page@body@box \newtoks\page@body@toks
\page@body@toks{}
\add@PageGrid@default
   {\page@body@toks={\setbox\page@body@box=\vbox\bgroup}}

\def\finish@part@routines
   {\append@to@list{page@head@toks}{\egroup\measure@head}
    \append@to@list{page@foot@toks}{\egroup\measure@foot}
    \append@to@list{page@body@toks}{\egroup}}

\newbox\whole@page
\def\make@page{
    \setbox\whole@page=\vbox 
       {\box\page@head@box
            \ifabut@head\nointerlineskip\fi
            \ifabut@foot\tempdima\dp\page@body@box\fi
        \box\page@body@box 
            \ifabut@foot\ifvoid\page@foot@box\else
                 \kern-\tempdima\relax\nointerlineskip\fi\fi
        \box\page@foot@box}%\showbox\whole@page
    }

% \vsize has two possibilities:
% 1/ it is calculated dynamically by subtracting
% body and foot height from the total page height.
% If \vsize is different from \ht255, the page
% is thrown back.
% 2/ it is set and the page has whatever size results.
%
\newif\iftext@fits
\def\see@if@text@fits
   {{\multiply\text@height\n@cols 
     \tempdima\text@height
     \advance\tempdima-\vsize
     \ifdim\tempdima<\z@ \tempdima=-\tempdima \fi
     \ifdim\tempdima<.1pt\relax
           \global\text@fitsyes
           \Tmessage[out]{Page accepted.}
     \else \global\text@fitsno
           \Tmessage[out]{Text does not fit. (vsize=\the\vsize)}
           \global\vsize=\text@height
     \fi}}

% Multicolumn stuff
% 
% every PageGrid macro installs \n@cols, but the user
% can specify a different number with \NumberOfColumns:x
% This sets \user@n@cols which is usually -1
%
\newcount\n@cols \n@cols\@ne
\newcount\@colnum
\newcount\user@n@cols \user@n@cols\m@ne
\Distance:GutterWidth=1cm
\def\NumberOfColumns:#1
   {\user@n@cols=\w@w{#1}\relax
    \Tmessage[out]{Switch to \the\user@n@cols\@space columns}
    \hsize\page@width 
    \tempdima\GutterWidth \multiply\tempdima\user@n@cols
    \advance\tempdima-\GutterWidth
    \advance\hsize-\tempdima \divide\hsize\user@n@cols}
\add@user@override{\ifnum\user@n@cols=\m@ne\else
    \csarg\let{\output@routine @body}\trivial@body
    \n@cols\user@n@cols
    \Tmessage[out]{User override: \the\n@cols\@space columns.}%
    \fi}

\def\trivial@body{\Tmessage[out]{Trivial multicolumn (\the\n@cols) setup}
    \@colnum\@ne \splittopskip\topskip
    \setbox\page@body@box\hbox{\text@column}
    \@colnum\tw@
    \ifnum\n@cols>\@ne 
        \loop \setbox\page@body@box\hbox{\unhbox\page@body@box
              \kern\GutterWidth \text@column}
              \advance\@colnum\@ne
              \ifnum\@colnum>\n@cols\else\repeat
    \fi}
\def\real@text@column{\begingroup\vbadness\@M
    \setbox\z@
    \ifnum\n@cols=\@ne
        \vbox to \vsize{\boxmaxdepth\maxdepth
                 \ifvoid\topins\else\unvbox\topins \fi
                 \unvbox\@cclv
                 \ifvoid\footins\else\unvbox\footins \fi}%
        \Tmessage[out]{Column: \the\ht\z@+\the\dp\z@}%
    \else
        \vsplit\@cclv to \text@height
        \Tmessage[out]{Column \the\@colnum: \the\ht\z@+\the\dp\z@}%
    \fi \ifnum\badness=\@M\Wmessage{Underfull textcolumn}\fi
    \box\z@ \endgroup}

\let\OriginalShipout\shipout \let\CurrentShipout\shipout
\newif\ifCountSheets \CountSheetsyes
\def\finish@off@page{\Tmessage[out]{Whole page:
                        \the\ht\whole@page+\the\dp\whole@page}
    {\def\protect{\noexpand\protect\noexpand}
     \def\cprotect{\expandafter\string}
     \normalesc
     \ifsink@pages 
       \message{Page sunk [\the\sheet@counter.\csarg\the
                                     {\counter@name{Page}}]}
       \deadcycles\z@
     \else \CurrentShipout\box\whole@page
           \ifCountSheets\global\advance\sheet@counter\@ne\fi
     \fi
     }
    \global\step@counter{Page}
    }  
\def\shipout@and@unbox@remainder{
    \iftext@fits \make@page \finish@off@page \fi
    \ifvoid\@cclv \Tmessage[out]{Shipped out whole page}
    \else \Tmessage[out]{Part of page not shipped: \the\ht\@cclv} 
          \unvbox\@cclv 
          \ifnum\outputpenalty=\@M\else\penalty\outputpenalty\fi
    \fi
    \iftext@fits \ifother@grid\install@next@page@grid
                 \else\Tmessage[out]{Same grid once again.}\fi 
    \fi}

\newif\ifsink@pages
\sink@pagesno
\let\NoPages\sink@pagesyes \let\PagesOut\sink@pagesno

% this is a mess. clear up please.
\newtoks\page@options
\def\options@to@pagepart
   {\append@cs@to@list{page@\page@part @toks}\page@options
              \page@options={}}
\add@PageGrid@default{\csarg\newtoks{\@name @routine}
    \def\@current@options@list{page@options}
    \def\page@part{head}\page@options{}
    }

\def\install@output@routine#1{{\globaldefs\@ne
    \output=\xp{\csname#1@routine\endcsname}%
    \def\output@routine{#1}%
    \Tmessage[out]{Install output: #1 ---}%
    \@pagegrid@installedyes
    \csname#1@install@parameters\endcsname
    }}

\newdimen\text@height

% During the load of this file we build up a list of
% defaults and test. These are then turned into PageGrid@default
% at the end of this file.
\newtoks\otr@settings \newtoks\otr@conditions
\def\add@otr@setting#1{\append@to@list{otr@settings}{#1}}
\def\del@otr@setting#1{\del@tok@from@list{otr@settings}#1}
\def\add@otr@condition#1{\append@to@list{otr@conditions}{#1}}
\def\set@otr@stuff{\def\cs@e##1{
    \edef\cs@f{\nxp\adds@PageGrid@default{\global##1={\the##1}}}
    \cs@f}
  \cs@e\otr@settings \cs@e\otr@conditions}
%\showthe\otr@settings \showthe\otr@conditions
%\showthe\PageGrid@defaults}
       
\def\@DefinePageGrid{\options@to@pagepart \finish@part@routines
    \csarg\edef{\@name @install@parameters}{%
          \vsize\the\height@toks\relax \set@topskip
          \multiply\vsize
            \nxp\ifnum\user@n@cols>\@ne\user@n@cols\relax
            \nxp\else\the\n@cols\relax\nxp\fi
          \hsize\the\width@toks\relax
          \def\CSname{\@name @page@width}%
                 {\the\width@toks\relax}%
          \nxp\Tmessage[out]{Initial hsize: \nxp\the\hsize}%
          \ifwidth@of@text 
          \else \nxp\hsize@from@page@width
                \ifnum\the\n@cols>1 
                    \divide\hsize\the\n@cols\relax\fi
          \fi
          \nxp\Tmessage[out]{Installed hsize: \nxp\the\hsize}%
          }
    \csarg\edef{\@name @otr@parameters}{%
          \the\otr@settings
          \xp\@empty\the\otr@conditions
          \CSname{height@of@text\ifheight@of@text yes\else no\fi}%
          \text@height\the\height@toks\relax
          \CSname{width@of@text\ifwidth@of@text yes\else no\fi}%         
          \n@cols\the\n@cols\relax}
    \csarg\edef{\@name @head@foot}{\the\page@head@toks 
          \the\page@foot@toks
          \ifheight@of@text\else
          \advance\text@height-\head@height 
          \advance\text@height-\foot@height
          \fi}
    \csarg\edef{\@command @body}{\the\page@body@toks}
    \csarg\edef{\@command}{%
          \nxp\EjectPage
          \nxp\install@output@routine{\@name}%
          %\global\hsize= \ifseen@text \CSname{\@name @text@width}%
          %           \else \CSname{\next@page@grid @text@width}%
          %           \fi
          \outer@start@commands \after@indent
          }
    \csarg\edef{\@name @routine}{
      \nxp\Tmessage[out]{======== Output routine: \@name\@space ==========}
      \nxp\output@setup 
      \CSname{\@name @otr@parameters}
      \nxp\the\user@overrides
      \CSname{\@name @head@foot}
      \nxp\goal@height@trace
      \ifnum\n@cols=\z@ %% no text, trivial case.
            \setbox\page@body@box\voidb@x 
            \nxp\text@fitsyes
      \else \nxp\ifragged@bottom\nxp\text@fitsyes
            \nxp\else\nxp\see@if@text@fits\nxp\fi
            \nxp\iftext@fits%\nxp\show
              %\CSname{\@name @body}
               \let\nxp\text@column\nxp\real@text@column
               \CSname{\@name @body}
               \nxp\report@body@measurement
            \nxp\fi
      \fi
      \nxp\shipout@and@unbox@remainder
      \nxp\Tmessage[out]{==========}%
      }
    \xp\install@output@routine\xp{\@name}
    }

% not operative yet.
\new@dimen{user@page@height}{\m@ne sp}
\new@dimen{user@text@height}{\m@ne sp}
\def\Height:#1=#2
   {\switch {\if\EqualString{#1}}
    {Page} {\user@page@height\w@w{#2}}
    {Text} {\user@text@height\w@w{#2}}
    {default} {\Wmessage{Unknown option: `Height:#1=#2'}}
    \endswitch}

%-- height of page/text
%
% the \ifheight@of@text conditional is also used
% during run time.
%
\newif\ifheight@of@text
\newtoks\height@toks \newdimen\page@height
\add@PageGrid@default{\height@of@textyes\height@toks{20cm}}
\add@PageGrid@default{\let\text@lines\relax}
\@PageGridOption{height}{
    \switch {\if\EqualString{#1}}
        {page}  {\height@of@textno}
        {text}  {\height@of@textyes}
        {lines} {\height@of@textyes
              \edef\cs@e{\def\nxp\text@lines{\@w@w{#2}}}\cs@e}
        {default} {\Wmessage{Strange modifier: `height:#1=#2'}}
    \endswitch
    \edef\cs@e{\nxp\height@toks={\@w@w{#2}}}\cs@e
    }
% Make sure that the \Height command is not used!
\@PageGridNOOP{Height}

%%%%
%
% Width handling
%
\newif\ifwidth@of@text
\newtoks\width@toks \newdimen\page@width
\@PageGridOption{width}{
    \switch {\if\EqualString{#1}}
        {page} {\width@of@textno}
        {text} {\width@of@textyes}
        {default} {\Wmessage{Strange modifier: `width:#1=#2'}}
    \endswitch
    \edef\cs@e{\nxp\width@toks={\@w@w{#2}}}\cs@e
    }

% Make sure that the \Width command is not used!
\@PageGridNOOP{Width}

% At installation of the output routine, calculate the hsize
% if the page width is given.
%
\def\hsize@from@page@width
   {\def\text@column{\hskip\z@\relax}%
    \let\maybe@to@page@width\relax
    \the\page@body@toks %\showthe\page@body@toks 
    \Tmessage[out]{Width page body minus text: \the\wd\page@body@box}%
    \global\advance\hsize-\wd\page@body@box}

% At the start of the output routine, calculate the page width
% from the hsize (which may have been tinkered with), or set to
% routine-specific page width (which may also have been changed).
%
\def\output@set@page@width
   {\ifwidth@of@text
        \edef\text@column{\hskip\the\wd\@cclv\relax\hskip\z@\relax}%
        \let\maybe@to@page@width\relax
        \csn\output@routine @body\ecs
        \page@width\wd\page@body@box
        \Tmessage[out]{Deduced page width: \the\page@width}
    \else \def\maybe@to@page@width{ to \page@width}
        \page@width\csn\output@routine @page@width\ecs\relax
    \fi}

%%%% Topskip
% initially the outer topskip is picked up, unless
% the option 'topskip' is given.
%
\add@PageGrid@default
   {\edef\set@topskip
      {\topskip\the\topskip\relax\splittopskip\topskip}}
\@PageGridOption{topskip}{
    \edef\cs@e
       {\def\nxp\set@topskip{\topskip\@w@w{#1}\relax
                     \splittopskip\topskip}}
    \cs@e
    }
% ragged bottom the way it's done in plain TeX.
\newif\ifragged@bottom
\add@otr@setting{\ragged@bottomno}
\@PageGridOption{raggedbottom}{
    \del@otr@setting{\ragged@bottomno}
    \add@otr@setting{\ragged@bottomyes}
    \if\EmptyList{#1}\@add@toks{\var@topskip{60pt}}
    \else\edef\cs@e{\nxp\@add@toks{\nxp\var@topskip{\@w@w{#1}}}}
         \cs@e
    \fi}
\def\var@topskip#1{\tempdima\topskip\tempskipa\z@ plus #1\relax
    \topskip\tempdima \advance\topskip\tempskipa
    \splittopskip\topskip}

%-- textband
\newif\ifin@textband \add@PageGrid@default{\in@textbandno}
\@PageGridOption{textband}{
    \switch {\if\EqualString{#1}}
        {start} {\start@textband}
        {stop}  {\stop@textband}
        {default} {\Wmessage{Strange modifier `textband:#1'}}
    \endswitch}
\newdimen\text@width
\def\start@textband
   {\options@to@pagepart 
    \b@group[textband]\@hmodeyes\in@textbandyes
    \@add@toks{\hbox \maybe@to@page@width\bgroup}
    }
\def\stop@textband
   {\@add@toks{\egroup} \e@group[textband]
    \ifseen@text \before@textno
             \def\page@part{body} \options@to@pagepart
             \def\page@part{foot} 
    \fi}

%-- band
\newif\ifabut@foot \newif\ifabut@head
\add@otr@setting{\abut@footno \abut@headno}
\@PageGridOption{band}{
    \switch {\if\EqualString{#1}}
        {start} {\@add@toks{\hbox to \page@width\bgroup}
              \b@group[band]\@hmodeyes
              \def\block@closing{\@add@toks{\hfil\egroup}
                  \e@group[band]}}
        {invisible} {\@add@toks{\setbox\tempboxa
                                \hbox to \page@width\bgroup}
              \b@group[band]\@hmodeyes
              \def\block@closing{\@add@toks{\hfil\egroup}
                  \ifbefore@text
                      \@add@toks{\vtop to\z@{\kern\z@\box\tempboxa\vss}
                                      \nointerlineskip}
                      \del@otr@setting{\abut@headno}
                      \add@otr@setting{\abut@headyes}
                      %\global\abut@headyes
                  \else  \@add@toks{\nointerlineskip
                                      \vbox to\z@{\vss\box\tempboxa}}
                      \del@otr@setting{\abut@footno}
                      \add@otr@setting{\abut@footyes}
                      %\global\abut@footyes
                  \fi\e@group[band]}}
        {stop}  {\block@closing}
        {default} {\Wmessage{Strange modifier `band:#1'}}
    \endswitch}


%-- next page grid
\newif\ifother@grid
\add@PageGrid@default{\other@gridno}
\add@otr@setting{\other@gridno}
\add@otr@condition{\ifother@grid
    \def\nxp\install@next@page@grid
       {\nxp\install@output@routine{\next@page@grid}}%
  \fi}
\@PageGridOption{NextPageGrid}{\other@gridyes
    \del@otr@setting{\other@gridno}
    \add@otr@setting{\other@gridyes}
    \def\next@page@grid{#1}
    }

%-- text
\add@PageGrid@default{\n@cols\z@}
\newif\ifbefore@text 
\newif\ifseen@text %this one is also used by 'external'
\add@PageGrid@default{\before@textyes \seen@textno}
\@PageGridOption{text}{\global\seen@textyes
    \ifin@textband\else\Emessage{'text' has to be in 'textband'}\fi
    \global\advance\n@cols\@ne
    \@add@toks{\text@column}}

%%%%%%%%%%%%%%%%%%%%%%% user commands

\def\leegbladinvoegen{\@g@stapteller{Page}}
\def\EjectPage{\vfil\eject}
\def\ToRecto{\csarg\ifodd{\counter@name{Page}}\else\step@counter{Page}\fi}
\def\ToVerso{\csarg\ifodd{\counter@name{Page}}\step@counter{Page}\fi}

% less useful user command (mostly for formatting the manual :-)
%
\newbox\saved@page@box \newdimen\saved@hsize \newcount\saved@pageno
\newtoks\saved@mark@items
\def\SuspendOutput{\xdef\saved@output@routine{\output@routine}%
    \global\saved@hsize\hsize \global\saved@mark@items\mark@items
    \global\saved@pageno\cs@counter@name{Page}%
    \output{\global\setbox\saved@page@box\box\@cclv
            \Tmessage[out]{Suspend output; 
               saved (\the\ht\saved@page@box+\the\dp\saved@page@box)
               x \the\wd\saved@page@box}%
            \global\output{\Emessage{You should not call output now!}%
                           \OriginalShipout\box\@cclv}}%
    \eject
    }
\def\ResumeOutput
   {\xp\install@output@routine\xp{\saved@output@routine}%
    \global\hsize\saved@hsize \global\mark@items\saved@mark@items
    \global\cs@counter@name{Page}\saved@pageno
    \unvbox\saved@page@box
    }
 
%%%%%%%%%%%%%%%% Marks
%%%%
\NewTrace:mark
\def\FirstPlaced:#1 
   {\Tmessage[mark]{First Placed #1 from \firstmark}%
    \xp\get@placed\xp{\firstmark}{#1}}
\def\PreviousPlaced:#1
   {\Tmessage[mark]{Previous Placed #1 from \topmark}%
    \xp\get@placed\xp{\topmark}{#1}}
\def\LastPlaced:#1
   {\Tmessage[mark]{Last Placed #1 from \botmark}%
    \xp\get@placed\xp{\botmark}{#1}}
\def\get@placed#1#2{%
    \get@@placed{#2}#1{SM}{}$}% SM: StopMarker
\def\get@@placed#1#2#3{\if\EqualStringX{#2}{SM}\xp\take@to@dollar
    \else\if\EqualStringX{#1}{#2}%
              \maybe@uppercase{#3}\xp\xp\xp\take@to@dollar
         \else\xp\xp\xp\get@@placed\fi
    \fi{#1}}
\ifini{\newtoks\mark@items}
      % \newtoks\mark@toks % is this one used?

\newif\ifhas@marks
\add@generic@default{\has@marksno}
    % only yes in heading and output routine.
    % it seems that you can have page breaks at marks...
\@GenericOption{nomarks}{\has@marksno}
\def\add@mark@item#1{\csarg\newtoks{mark@toks@#1}%
    \Tmessage[mark]{Adding mark item #1}%
    \global\mark@items\xp{\the\mark@items{#1}}}
\def\refresh@mark@item#1#2{\csarg\global{mark@toks@#1}{#2}}
\def\get@mark@items#1{\if\EqualStringX{#1}{SM}%
    \else{#1}{\csarg\the{mark@toks@#1}}\xp\get@mark@items
    \fi}
\def\place@mark{\mark{\xp\get@mark@items\the\mark@items{SM}}}

% this one should be defined in document.tex
\add@mark@item{first@page}

% Page wide rule

\@PageGridOption{pagerule}{
    \@add@toks{\hrule width\page@width\relax\nobreak}}

% Set default otr@settings and otr@conditions
\set@otr@stuff

\endinput

92/10/24 raggedbottom in progress
92/11/04 splittopskip made equal to topskip
92/11/14 messed with otr@xyz token lists
92/11/15 warning on underfull text column;
           ragged bottom still not working properly


%%%%%%%%%%%%%%%%%%%%%% Old Stuff; maybe useful, maybe not

\newskip\@topS \newskip\@botS
{\noeol
\othercr
\gdef\topillustratie{\bgroup\othercr \@topill}
\gdef\@topill:#1=#2^^M{\edef\cs@e{\gdef\CSname{@topS#1}{#2}}
    \cs@e \global\advance\@topS #2\egroup}
\gdef\botillustratie{\bgroup\othercr \@botill}
\gdef\@botill:#1=#2^^M{\edef\cs@e{\gdef\CSname{@botS#1}{#2}}
    \cs@e \global\advance\@botS #2\egroup}}

\def\@wisill{\global\@topS\z@ \global\@botS\z@
    \csarg\gdef{@topS1}{\z@}\csarg\gdef{@botS1}{\z@}
    \csarg\gdef{@topS2}{\z@}\csarg\gdef{@botS2}{\z@}
    \csarg\gdef{@topS3}{\z@}\csarg\gdef{@botS3}{\z@}
    }
\@wisill

\newtoks\@stramienlijst
\def\invoerpad{}
\def\opmaak: #1\par{\@stramienlijst={}
    \def\cs@a##1 {\eqstring{##1}{klaar}{}%
       {\append@to@list{@stramienlijst}{\@probeerstramien ##1;}
        \cs@a}}
    \cs@a #1klaar }%% let op de significante spaties!!
    %% en de spatie achter het laatste stramien komt van de ^^M
\def\invoer: #1 {
    \def\@probeerstramien ##1;{\csn ##1\ecs 
        \message{Ik probeer het met opmaak: ##1}
        \@installeertellers{##1}
        \input \invoerpad#1.tex
        \vfill\eject
        \@bewaartellers{##1}
        }
    \the\@stramienlijst}

%% uitloop van vorige output routine
% iftempf: als pagina geen uitloop gebruikt, direct eventuele
%          uitloop leeg gooien.
% laatste pagina: tempboxa <- vbox{unvcopy255}
% er wordt een pagina uitgeworpen:
%    - 255 is void: invoer is op, dus uitlopen 
%                   als dit de laatste pagina was
%    - 255 non-void: er is iets terug te werpen; dit was kennelijk niet
%                   de laatste pagina, dus geen uitloop.

\newbox\@uitloop \newbox\@tempuitloop \newif\ifisereenuitloop
    \Tmessage[out]{Aangetroffen uitloop: \the\ht\@uitloop+\the\dp\@uitloop}

%-- uitloop
% mag alleen in kop of voet voorkomen.
\setbox\@tempuitloop=
        \vbox{\ifvoid\topins\else\unvcopy\topins\fi
              \unvcopy\@cclv\kern\z@}
\setbox\@tempuitloop=\hbox{}
\@PageGridOption{uitloop}{\tempfyes 
    \@add@toks{\Tmessage[out]{Uitloop wordt verwerkt.}% 
          \copy\@uitloop 
          }}

          \iftempd
              \iftempc \Tmessage[out]{Eerste pagina, derhalve:}
                       \@loopnietuit \else \@loopuit \fi
          \else \Tmessage[out]{Niet de laatste pagina, derhalve:}
                \@loopnietuit \fi

          \iftempf \else \nxp\@uitloopwegwerpen \fi %geheugenbesparing.

\def\@loopuit{\global\isereenuitloopyes 
    \global\setbox\@uitloop=\box\@tempuitloop
    \Tmessage[out]{Uitloop: \the\ht\@uitloop+\the\dp\@uitloop}}
\def\@loopnietuit{\global\isereenuitloopno \@uitloopwegwerpen}
\def\@uitloopwegwerpen{
    \Tmessage[out]{Uitloop weggegooid: \the\ht\@uitloop+\the\dp\@uitloop}
    \global\setbox\@uitloop=\hbox{}}

%-- veld %% is deze nog nodig nu we 'tekstblok' generisch hebben?
\@PageGridOption{veld}{
    \eqstring{#1}{stop}%
         {\@add@toks{\egroup}}%
         {\@add@toks{\vtop\bgroup\kern0cm}
          \eqstring{#1}{uitvullen}{}%
                   {\@add@toks{\hsize=\w@w{#1}}
                    \iftempc\advance\text@width-\w@w{#1}\fi}
         }}
%-- parallel Nog eens goed over nadenken.
\@PageGridOption{parallel}{
    \eqstring{#1}{stop}%
         {\@add@toks{\vfil\egroup\egroup}}%
         {\@add@toks{\vtop\bgroup\kern0cm
                \vbox to \vsize\bgroup}% dit is fout.
          \eqstring{#1}{uitvullen}{}%
                {\iftempc\advance\text@width-\w@w{#1}\relax\fi
                 \@add@toks{\hsize=\w@w{#1}}}
          }}
%-- kolommenbalanceren
% heeft alleen zin voor meerkoloms uitvoer,
% werkt alleen op laatste pagina
\@PageGridOption{kolommenbalanceren}{
    \eqstring{#1}{}{\tempgyes}{\csn tempg#1\ecs}}

