%D \module
%D   [       file=m-visual,
%D        version=2000.01.10,
%D          title=\CONTEXT\ Extra Modules,
%D       subtitle=Visualization and Faking,
%D         author={Hans Hagen \& Ton Otten},
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

\unprotect

%D Much will probably be replaced by \LUA\ based solutions which is
%D rather trivial and fun doing.

%D This module collect a few more visual debugger features. I
%D needed them for manuals and styles. The macros are documented
%D in a my way document.

\definecolor[fakerulecolor]     [black]
\definecolor[fakebaselinecolor] [green]
\definecolor[fakeparindentcolor][blue]

\newif\iffakebaseline \fakebaselinetrue

\unexpanded\def\fakerule#1%
  {\strut
   \begingroup
   \directcolored[fakerulecolor]%
   \iffakebaseline
     \vrule\s!height1.25ex\s!depth-.05ex\s!width#1%
     \kern-#1%
     \vrule\s!height-.05ex\s!depth .25ex\s!width#1%
   \else
     \vrule\s!height1.25ex\s!depth .25ex\s!width#1%
   \fi
   \endgroup
   \allowbreak}

\unexpanded\def\dorandomrecurse#1%
  {\getrandomcount\scratchcounter{1}{#1}%
   \dorecurse\scratchcounter}

% can be used in hbox, so %'s are really needed

\unexpanded\def\fakelines#1#2% min max / 3 10
  {\fakeparindent
   \scratchdimen\hsize
   \ifindentation
     \advance\scratchdimen -\parindent
   \fi
   \fakerule\scratchdimen\break
   \getrandomcount\scratchcounter{\ifcase0#1 3\else#1\fi}{\ifcase0#2 10\else#2\fi}%
   \dorecurse\scratchcounter{\fakerule\hsize}%
   \getrandomdimen\scratchdimen{.25\hsize}\hsize
   \fakerule\scratchdimen
   \par} % indeed

\unexpanded\def\fakewords
  {\ifvmode\fakeparindent\fi\onlyfakewords}

\definepalet
  [fakerule]
  [fr1c=darkred,
   fr2c=darkgreen,
   fr3c=darkblue,
   fr4c=darkyellow,
   fr5c=darkgray]

\unexpanded\def\onlyfakewords#1#2% min max / 10 40
  {\getrandomcount\scratchcounter{\ifcase0#1 10\else#1\fi}{\ifcase0#2 40\else#2\fi}%
   \dofakewords\scratchcounter
   } % no \par

\unexpanded\def\fakenwords#1#2% words seed
  {\fakeparindent
   \getrandomseed\fakedwordseed
   \setrandomseed{\ifcase0#2 #1\else#2\fi}%
   \dofakewords{#1}%
   \setrandomseed\fakedwordseed
   } % no \par

\def\dofakewords#1%
  {\bgroup
   \dorecurse{#1}
     {\getrandomcount\scratchcounter{1}{5}%
      \dorecurse\scratchcounter
        {\getrandomdimen\scratchdimen{.5em}{1.25em}%
         \fakerule\scratchdimen}%
      \space}%
   \removeunwantedspaces
   \egroup}

\def\doshowfakewords#1%
  {\bgroup
   \setuppalet[fakerule]%
   \definecolor[fakerulecolor]%
   \dorecurse{#1}
     {\getrandomcount\scratchcounter{1}{5}%
      \dorecurse\scratchcounter
        {\getrandomdimen\scratchdimen{.5em}{1.25em}%
         \color[fr\recurselevel c]{\fakerule\scratchdimen}}%
      \space}%
   \removeunwantedspaces
   \egroup}

\unexpanded\def\showfakewords
  {\let\dofakewords\doshowfakewords}

\unexpanded\def\fakeword
  {\fakewords{1}{1}} % no \plusone

\unexpanded\def\fakeparindent
  {\noindent
   \ifindentation
     \ifx\dofakedroppedcaps\relax
       {\fakeparindentcolor
        \vrule
          \s!height \strutheight % not longer .5ex
          \s!depth  \strutdepth  % not longer 0pt
          \s!width  \parindent}%
     \else
       \dofakedroppedcaps \let\dofakedroppedcaps\relax
     \fi
%    \else
%      \dontleavehmode
   \fi}

\let\dofakedroppedcaps\relax

\unexpanded\def\fakedroppedcaps#1%
  {\ifnum#1>0
     \def\dofakedroppedcaps
       {\setbox\scratchbox\hbox
          {\setbox\scratchbox\hbox{W}%
           \scratchdimen#1\lineheight
           \advance\scratchdimen -\lineheight
           \advance\scratchdimen \dp\strutbox
           \vrule
             \s!width#1\wd\scratchbox
             \s!height\ht\scratchbox
             \s!depth\scratchdimen}%
        \ht\scratchbox\ht\strutbox
        \dp\scratchbox\dp\strutbox
        \hangindent\wd\scratchbox
        \advance\hangindent .5em
        \wd\scratchbox\hangindent
        \hangafter-#1\noindent
        \llap{\fakeparindentcolor\box\scratchbox}}%
   \fi}

\unexpanded\def\fakefigure
  {\dodoubleempty\dofakefigure}

\def\dofakefigure[#1][#2]#3#4#5#6% [] [] minwidth maxwidth minheight maxheight
  {\getvalue{\e!place\v!figure}
     [#1][#2]%
     {\freezerandomseed
      \let\endstrut\relax
      \let\begstrut\relax
      \doifinsetelse{#1}{\v!left,\v!right}
        {\fakewords{2}{4}}
        {\fakewords{4}{10}}}%
     {\doifinset{#1}{\v!left,\v!right}
        {\dimen0=.75\dimen0
         \ifdim\dimen0>.6\hsize \dimen0=.5\hsize\fi
         \ifdim\dimen0<.3\hsize \dimen0=.3\hsize\fi}%
      \framed
        [\c!width=\dimen0,
         \c!height=\dimen2,
         \c!frame=\v!off,
         \c!background=\v!color,
         \c!backgroundcolor=fakeparindentcolor]
        {\bf\white#1}}%
   \defrostrandomseed}

\unexpanded\def\fakeimage#1#2#3#4%
  {\getrandomdimen{\dimen0}{#1}{#3}%
   \getrandomdimen{\dimen2}{#2}{#4}%
   \framed
     [\c!width=\dimen0,
      \c!height=\dimen2,
      \c!frame=\v!off,
      \c!background=\v!color,
      \c!backgroundcolor=fakeparindentcolor]
     {}}

\unexpanded\def\fakeformula
  {\dimen0\zeropoint
   \getrandomcount\scratchcounter{3}{6}%
   \dorecurse\scratchcounter
     {\getrandomdimen\scratchdimen{1em}{3em}%
      \mathinner{\red\fakerule\scratchdimen}%
      \ifnum\recurselevel<\scratchcounter+\fi
      \advance\scratchdimen\dimen0}%
   =\mathinner{\red\fakerule\scratchdimen}}

\unexpanded\def\fakespacingformula
  {\color[fakebaselinecolor]{\ruledbaseline}\fakeformula}

%D test \type{\bodyfontgrid}\space test
%D test \type{\emexgrid}    \space test

\unexpanded\def\smashedgrid
  {\dosingleempty\dosmashedgrid}

\def\dosmashedgrid[#1]%
  {\hsmashed
     {\setbox\scratchbox=\hbox
        {\basegrid
           [\c!nx=10,\c!ny=10,\c!dx=1,\c!dy=1,
            \c!unit=\bodyfontsize,#1]}%
      \hbox to \zeropoint
        {\hss\lower.5\ht\scratchbox\box\scratchbox\hss}%
      \hbox to \zeropoint
        {\hss
         \black\vrule\s!width6\linewidth\s!height3\linewidth\s!depth3\linewidth
         \hss}}}

\unexpanded\def\bodyfontgrid
  {\hbox
     {{\linewidth.1pt\yellow\smashedgrid[\c!nx=30,\c!ny=30,\c!scale=.3333]}%
      {\linewidth.2pt\green \smashedgrid[\c!nx=20,\c!ny=20,\c!scale=.5]}%
      {\linewidth.3pt\red   \smashedgrid[\c!nx=10,\c!ny=10,\c!scale=1]}}}

\unexpanded\def\emexgrid
  {\hbox
     {{\linewidth.15pt\green\smashedgrid[\c!nx=20,\c!ny=20,\c!unit=ex]}%
      {\linewidth.15pt\red  \smashedgrid[\c!nx=10,\c!ny=10,\c!unit=em]}}}

%D For Mojca:

\unexpanded\def\simplethesis
  {\setupsystem[random=1234]
   \title{\fakewords{3}{4}}
   \placelist[chapter,section]
   \dorecurse{6}
     {\chapter{\fakewords{5}{10}}
      \dorecurse{5}
        {\section{\fakewords{2}{5}}
         \dorecurse{2}
           {\dorecurse{3}{\fakewords{100}{200}\endgraf}
            \placefigure{\fakewords{8}{15}}{\fakeimage{5cm}{3cm}{10cm}{5cm}}
            \dorecurse{2}{\fakewords{100}{200}\endgraf}}}}}

%D Moved code:

%D \module
%D   [       file=trac-vis, % was core-vis,
%D        version=1996.06.01,
%D          title=\CONTEXT\ Tracking Macros,
%D       subtitle=Visualization,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

%D This module adds some more visualization cues to the ones
%D supplied in the support module.
%D
%D %\everypar   dual character, \the\everypar and \everypar=
%D %\hrule      cannot be grabbed in advance, switches mode
%D %\vrule      cannot be grabbed in advance, switches mode
%D %
%D %\indent     only explicit ones
%D %\noindent   only explicit ones
%D %\par        only explicit ones
%D
%D %\leftskip   only if explicit one
%D %\rightskip  only if explicit one

\writestatus{loading}{ConTeXt Tracking Macros / Visualization}

\unprotect

%D \macros
%D   {indent, noindent, par}
%D
%D \TeX\ acts upon paragraphs. In mosts documents paragraphs
%D are separated by empty lines, which internally are handled as
%D \type{\par}. Paragraphs can be indented or not, depending on
%D the setting of \type{\parindent}, the first token of a
%D paragraph and/or user suppressed or forced indentation.
%D
%D Because the actual typesetting is based on both explicit
%D user and implicit system actions, visualization is only
%D possible for the user supplied \type{\indent},
%D \type{\noindent}, and \type{\par}. Other
%D 'clever' tricks will quite certainly lead to more failures
%D than successes, so we only support these three explicit
%D primitives and one macro:

\unexpanded\def\showparagraphcue#1#2#3#4#5%
  {\bgroup
   \scratchdimen#1\relax
   \dontinterfere
   \dontcomplain
   %boxrulewidth5\testrulewidth
   #3#4\relax
   \setbox\scratchbox\normalhbox to \scratchdimen
     {#2{\ruledhbox to \scratchdimen
           {\vrule #5 20\testrulewidth \s!width \zeropoint
            \normalhss}}}%
   \smashbox\scratchbox
   \normalpenalty\plustenthousand
   \box\scratchbox
   \egroup}

\unexpanded\def\ruledhanging
  {\ifdim\hangindent>\zeropoint
     \ifnum\hangafter<\zerocount
       \normalhbox
         {%boxrulewidth5\testrulewidth
          \setbox\scratchbox\ruledhbox to \hangindent
            {\scratchdimen\strutht
             \advance\scratchdimen \strutdp
             \vrule
               \s!width  \zeropoint
               \s!height \zeropoint
               \s!depth -\hangafter\scratchdimen}%
          \normalhskip-\hangindent
          \smashbox\scratchbox
          \raise\strutht\box\scratchbox}%
     \fi
   \fi}

\unexpanded\def\ruledparagraphcues
  {\bgroup
   \dontcomplain
   \normalhbox to \zeropoint
     {\ifdim\leftskip>\zeropoint\relax
        \showparagraphcue\leftskip\llap\relax\relax\!!depth
        \normalhskip-\leftskip
      \fi
      \ruledhanging
      \normalhskip\hsize
      \ifdim\rightskip>\zeropoint\relax
        \normalhskip-\rightskip
        \showparagraphcue\rightskip\relax\relax\relax\!!depth
      \fi}%
   \egroup}

\unexpanded\def\ruledpar
  {\relax
   \ifhmode
     \showparagraphcue{40\testrulewidth}\relax\rightrulefalse\relax\s!height
   \fi
   \normalpar}

\unexpanded\def\rulednoindent
  {\relax
   \normalnoindent
   \ruledparagraphcues
   \showparagraphcue{40\testrulewidth}\llap\leftrulefalse\relax\s!height}

\unexpanded\def\ruledindent
  {\relax
   \normalnoindent
   \ruledparagraphcues
   \ifdim\parindent>\zeropoint
     \showparagraphcue\parindent\relax\relax\relax\s!height
   \else
     \showparagraphcue{40\testrulewidth}\llap\relax\relax\s!height
   \fi
   \normalhskip\parindent}

\unexpanded\def\dontshowimplicits
  {\let\noindent   \normalnoindent
   \let\indent     \normalindent
   \let\par        \normalpar}

\unexpanded\def\showimplicits
  {\testrulewidth  \defaulttestrulewidth
   \let\noindent   \rulednoindent
   \let\indent     \ruledindent
   \let\par        \ruledpar}

%D The next few||line examples show the four cues. Keep in
%D mind that we only see them when we explicitly open or close
%D a paragraph.
%D
%D \bgroup
%D \def\voorbeeld#1%
%D   {#1Visualizing some \TeX\ primitives and Plain \TeX\
%D    macros can be very instructive, at least it is to me.
%D    Here we see {\tt\string#1} and {\tt\string\ruledpar} in
%D    action, while {\tt\string\parindent} equals
%D    {\tt\the\parindent}.\ruledpar}
%D
%D \showimplicits
%D
%D \voorbeeld \indent
%D \voorbeeld \noindent
%D
%D \parindent=60pt
%D
%D \voorbeeld \indent
%D \voorbeeld \noindent
%D
%D \startnarrower
%D \voorbeeld \indent
%D \voorbeeld \noindent
%D \stopnarrower
%D \egroup
%D
%D These examples also demonstrate the visualization of
%D \type {\leftskip} and \type {\rightskip}. The macro
%D \type {\nofruledbaselines} determines the number of lines
%D shown.

\newcounter\ruledbaselines

\def\nofruledbaselines{3}

\unexpanded\def\ruledbaseline
  {\vrule \s!width \zeropoint
   \bgroup
   \dontinterfere
   \doglobal\increment\ruledbaselines
   \scratchdimen\nofruledbaselines\baselineskip
   \setbox\scratchbox\normalvbox to 2\scratchdimen
     {\leaders
        \normalhbox
          {\strut
           \vrule
             \s!height \testrulewidth
             \s!depth \testrulewidth
             \s!width 120\points}
      \normalvfill}%
   \smashbox\scratchbox
   \advance\scratchdimen \strutheightfactor\baselineskip
   \setbox\scratchbox\normalhbox
     {\normalhskip -48\points
      \normalhbox to 24\points
        {\normalhss
         {\ttxx\ruledbaselines}%
         \normalhskip6\points}%
      \raise\scratchdimen\box\scratchbox}%
   \smashbox\scratchbox
   \box\scratchbox
   \egroup}

\unexpanded\def\showbaselines
  {\testrulewidth\defaulttestrulewidth
   \EveryPar{\ruledbaseline}}

%D \macros
%D   {showpagebuilder}
%D
%D The next tracing option probaly is only of use to me and a
%D few \CONTEXT\ hackers.

\unexpanded\def\showpagebuilder
  {\EveryPar{\doshowpagebuilder}}

\unexpanded\def\doshowpagebuilder
  {\strut\llap
     {\startcolor[blue]\vl
      \high{\infofont v:\the\vsize    }\vl
      \high{\infofont g:\the\pagegoal }\vl
      \high{\infofont t:\the\pagetotal}\vl
      \stopcolor}}

%D \macros
%D   {colormarkbox,rastermarkbox}
%D
%D This macro is used in the pagebody routine. No other use
%D is advocated here.
%D
%D \starttyping
%D \colormarkbox0
%D \stoptyping

\def\colormarkoffset{\cutmarkoffset}
\def\colormarklength{\cutmarklength}

\def\dodocolorrangeA#1%
  {\fastcolored[#1]{\hrule\s!width3em\s!height\scratchdimen\s!depth\zeropoint}}

\def\docolorrangeA#1 #2 %
  {\vbox
     {\hsize3em % \scratchdimen
      \ifcase#1\or
        \dodocolorrangeA{c=#2}\or
        \dodocolorrangeA{m=#2}\or
        \dodocolorrangeA{y=#2}\or
        \dodocolorrangeA{m=#2,y=#2}\or
        \dodocolorrangeA{c=#2,y=#2}\or
        \dodocolorrangeA{c=#2,m=#2}\fi
      \ifdim\scratchdimen>1ex
        \vskip-\scratchdimen
        \vbox to \scratchdimen
          {\vss\hbox to 3em{\hss#2\hss}\vss}%
      \fi}}

\def\colorrangeA#1%
  {\vbox
     {\startcolor[\s!white]%
      \scratchdimen\dimexpr(-\colormarklength*4+\tractempheight+\tractempdepth)/21\relax
      \offinterlineskip
      \docolorrangeA #1 1.00 \docolorrangeA #1 0.95
      \docolorrangeA #1 0.75
      \docolorrangeA #1 0.50
      \docolorrangeA #1 0.25 \docolorrangeA #1 0.05
      \docolorrangeA #1 0.00
      \stopcolor}}

\def\docolorrangeB #1 #2 #3 #4 #5 %
  {\fastcolored
    [\c!c=#2,\c!m=#3,\c!y=#4,\c!k=#5]
    {\vrule\s!width\scratchdimen\s!height\colormarklength\s!depth\zeropoint}%
   \ifdim\scratchdimen>2em
     \hskip-\scratchdimen
     \vbox to \colormarklength
       {\vss\hbox to \scratchdimen{\hss#1\hss}\vss}%
   \fi}

\def\colorrangeB
  {\hbox
     {\startcolor[\s!white]%
      \scratchdimen\dimexpr(-\colormarklength*\plustwo+\tractempwidth)/11\relax
      \docolorrangeB .5~C .5  0  0  0
      \docolorrangeB .5~M  0 .5  0  0
      \docolorrangeB .5~Y  0  0 .5  0
      \docolorrangeB .5~K  0  0  0 .5
      \docolorrangeB    C  1  0  0  0
      \docolorrangeB    G  1  0  1  0
      \docolorrangeB    Y  0  0  1  0
      \docolorrangeB    R  0  1  1  0
      \docolorrangeB    M  0  1  0  0
      \docolorrangeB    B  1  1  0  0
      \docolorrangeB    K  0  0  0  1
      \stopcolor}}

\def\docolorrangeC#1 %
  {\fastcolored
     [\c!s=#1]%
     {\vrule\s!width\scratchdimen\s!height\colormarklength\s!depth\zeropoint}%
   \ifdim\scratchdimen>2em
     \hskip-\scratchdimen
     \vbox to \colormarklength
       {\vss\hbox to \scratchdimen{\hss#1\hss}\vss}%
   \fi}

\def\colorrangeC
  {\hbox
     {\startcolor[\s!white]%
      \scratchdimen\dimexpr(-\colormarklength*2+\tractempwidth)/14\relax
      \docolorrangeC  1  \docolorrangeC .95
      \docolorrangeC .9  \docolorrangeC .85
      \docolorrangeC .8  \docolorrangeC .75
      \docolorrangeC .7
      \docolorrangeC .6
      \docolorrangeC .5
      \docolorrangeC .4
      \docolorrangeC .3
      \docolorrangeC .2
      \docolorrangeC .1
      \docolorrangeC  0
      \stopcolor}}

\def\docolormarkbox#1#2%
  {\tractempheight\ht#2%
   \tractempdepth \dp#2%
   \tractempwidth \wd#2%
   \setbox#2\hbox
     {\scratchdimen\dimexpr\colormarklength/2\relax
      \forgetall
      \ssxx
      \setbox\scratchbox\vbox
        {\offinterlineskip
         \vskip\dimexpr-\colormarkoffset\scratchdimen-2\scratchdimen\relax
         \ifcase#1\relax
           \vskip\dimexpr\colormarklength+\scratchdimen+\tractempheight\relax
         \else
           \hbox to \tractempwidth{\hss\hbox{\colorrangeB}\hss}%
           \vskip\colormarkoffset\scratchdimen
           \vbox to \tractempheight
             {\vss
              \hbox to \tractempwidth
                {\llap{\colorrangeA1\hskip\colormarkoffset\scratchdimen}\hfill
                 \rlap{\hskip\colormarkoffset\scratchdimen\colorrangeA4}}%
              \vss
              \hbox to \tractempwidth
                {\llap{\colorrangeA2\hskip\colormarkoffset\scratchdimen}\hfill
                 \rlap{\hskip\colormarkoffset\scratchdimen\colorrangeA5}}%
              \vss
              \hbox to \tractempwidth
                {\llap{\colorrangeA3\hskip\colormarkoffset\scratchdimen}\hfill
                 \rlap{\hskip\colormarkoffset\scratchdimen\colorrangeA6}}%
              \vss}%
         \fi
         \vskip\colormarkoffset\scratchdimen
         \hbox to \tractempwidth
           {\hss\lower\tractempdepth\hbox{\colorrangeC}\hss}}%
      \ht\scratchbox\tractempheight
      \dp\scratchbox\tractempdepth
      \wd\scratchbox\zeropoint
      \box\scratchbox
      \box#2}%
   \wd#2\tractempwidth
   \ht#2\tractempheight
   \dp#2\tractempdepth}

\unexpanded\def\colormarkbox {\docolormarkbox\plusone  } % #1
\unexpanded\def\rastermarkbox{\docolormarkbox\zerocount} % #1

%D \macros
%D   {showwhatsits, dontshowwhatsits}
%D
%D \TEX\ has three so called whatsits: \type {\mark}, \type
%D {\write} and \type {\special}. The first one keeps track of
%D the current state at page boundaries, the last two are used
%D to communicate to the outside world. Due to fact that
%D especially \type {\write} is often used in conjunction with
%D \type {\edef}, we can only savely support that one in \ETEX.
%D
%D \bgroup \showwhatsits \setupcolors[state=start]
%D
%D Whatsits show up \color[blue]{in color} and are
%D characterized bij their first character.\footnote [some note]
%D {So we may encounter \type {w}, \type {m} and \type{s}.}
%D They are \writestatus{dummy}{demo}\color[yellow]{stacked}.
%D
%D \egroup

\newif\ifimmediatewrite

\let\supernormalmark  \normalmark  % mark may already been superseded
\let\supernormalmarks \normalmarks % mark may already been superseded

\unexpanded\def\showwhatsits
  {\protected\def\normalmark {\visualwhatsit100+m\supernormalmark }%
   \protected\def\normalmarks{\visualwhatsit100+m\supernormalmarks}%
   \protected\def\special    {\visualwhatsit0100s\normalspecial   }%
   \protected\def\write      {\visualwhatsit001-w\normalwrite     }%
   \let\immediate\immediatewhatsit
   \appendtoks\dontshowwhatsits\to\everystoptext}

\unexpanded\def\immediatewhatsit
  {\bgroup\futurelet\next\doimmediatewhatsit}

\unexpanded\def\doimmediatewhatsit
  {\ifx\next\write
     \egroup\immediatewritetrue
   \else
     \egroup\expandafter\normalimmediate
   \fi}

\unexpanded\def\dontshowwhatsits
  {\let\immediate \normalimmediate
   \let\normalmark\supernormalmark
   \let\special   \normalspecial
   \let\write     \normalwrite}

\unexpanded\def\visualwhatsit#1#2#3#4#5%
  {\bgroup
   \pushwhatsit
   \dontinterfere
   \dontcomplain
   \dontshowcomposition
   \dontshowwhatsits
   \ttx
   \ifvmode\donetrue\else\donefalse\fi
   \setbox\scratchbox\hbox
     {\ifdone
        \colored[r=#1,g=#2,b=#3]{#5}% temp hack
      \else
        \colored[s=0]{#5}% temp hack
      \fi}%
   \setbox\scratchbox\hbox
     {\ifdone
        \colored[r=#1,g=#2,b=#3]{\vrule\s!width\wd\scratchbox}% temp hack
      \else
        \colored[s=0]{\vrule\s!width\wd\scratchbox}% temp hack
      \fi
      \hskip-\wd\scratchbox\box\scratchbox}%
   \scratchdimen1ex
   \setbox\scratchbox\hbox
     {\ifdone\hskip\else\raise#4\fi\scratchdimen\box\scratchbox}%
   \smashbox\scratchbox
   \ifdone\nointerlineskip\fi
   \box\scratchbox
   \ifvmode\nointerlineskip\fi
   \popwhatsit
   \egroup
   \ifimmediatewrite
     \immediatewritefalse
     \expandafter\normalimmediate
   \fi}

\unexpanded\def\pushwhatsit
  {\ifzeropt\lastskip
     \ifcase\lastpenalty
       \ifzeropt\lastkern
         \ifhmode
           \let\popwhatsit\relax
         \else
           \edef\popwhatsit{\prevdepth\the\prevdepth}%
         \fi
       \else
         \ifhmode
           \edef\popwhatsit{\kern\the\lastkern}\unkern
         \else
           \edef\popwhatsit{\kern\the\lastkern\prevdepth\the\prevdepth}%
           \kern-\lastkern
         \fi
       \fi
     \else
       \ifhmode
         \edef\popwhatsit{\the\lastpenalty}%
         \unpenalty
       \else
         \edef\popwhatsit{\penalty\the\lastpenalty\prevdepth\the\prevdepth}%
        %\nobreak
       \fi
     \fi
   \else
     \ifhmode
       \edef\popwhatsit{\hskip\the\lastskip}\unskip
     \else
       \edef\popwhatsit{\vskip\the\lastskip\prevdepth\the\prevdepth}%
       \vskip-\lastskip
     \fi
   \fi}

%D The next macro can be used to keep track of classes of
%D boxes (handy for development cq.\ tracing).

\def\dodotagbox#1#2#3% can be reimplemented
  {\def\next##1##2##3##4%
     {\vbox to \ht#2{##3\hbox to \wd#2{##1#3##2}##4}}%
   \processaction
     [#1]
     [        l=>\next\relax\hfill\vfill\vfill,
              r=>\next\hfill\relax\vfill\vfill,
              t=>\next\hfill\hfill\relax\vfill,
              b=>\next\hfill\hfill\vfill\relax,
             lt=>\next\relax\hfill\relax\vfill,
             lb=>\next\relax\hfill\vfill\relax,
             rt=>\next\hfill\relax\relax\vfill,
             rb=>\next\hfill\relax\vfill\relax,
             tl=>\next\relax\hfill\relax\vfill,
             bl=>\next\relax\hfill\vfill\relax,
             tr=>\next\hfill\relax\relax\vfill,
             br=>\next\hfill\relax\vfill\relax,
     \s!default=>\next\hfill\hfill\vfill\vfill,
     \s!unknown=>\next\hfill\hfill\vfill\vfill]}

\def\dotagbox[#1]#2%
  {\bgroup
   \dowithnextbox
     {\setbox\scratchbox\flushnextbox
      \setbox\nextbox\ifhbox\nextbox\hbox\else\vbox\fi
        \bgroup
          \startoverlay
            {\copy\scratchbox}
            {\dodotagbox{#1}\scratchbox{\framed
               [\c!background=\v!screen,\c!backgroundscreen=1]{#2}}}
          \stopoverlay
        \egroup
      \nextboxwd\the\wd\scratchbox
      \nextboxht\the\ht\scratchbox
      \nextboxdp\the\dp\scratchbox
      \flushnextbox
      \egroup}}

\unexpanded\def\tagbox
  {\dosingleempty\dotagbox}

%D \macros
%D   {coloredhbox,coloredvbox,coloredvtop,
%D    coloredstrut}
%D
%D The following visualizations are used in some of the manuals:

\definecolor[boxcolor:ht][r=.5,g=.75,b=.5]
\definecolor[boxcolor:dp][r=.5,g=.5,b=.75]
\definecolor[boxcolor:wd][r=.75,g=.5,b=.5]
\definecolor[strutcolor] [r=.5,g=.25,b=.25]

\unexpanded\def\coloredbox#1%
  {\dowithnextbox{#1{\hbox
     {\blackrule[\c!width=\nextboxwd,\c!height=\nextboxht,\c!depth=\zeropoint,\c!color=boxcolor:ht]%
      \hskip-\nextboxwd
      \blackrule[\c!width=\nextboxwd,\c!height=\zeropoint,\c!depth=\nextboxdp,\c!color=boxcolor:dp]%
      \hskip-\nextboxwd
      \box\nextbox}}}#1}

\unexpanded\def\coloredhbox{\coloredbox\hbox}
\unexpanded\def\coloredvbox{\coloredbox\vbox}
\unexpanded\def\coloredvtop{\coloredbox\vtop}

\unexpanded\def\coloredstrut
  {\color[strutcolor]{\def\strutwidth{2\points}\setstrut\strut}}

\protect

\continueifinputfile{m-visual.mkiv}

\starttext
    \simplethesis
\stoptext
