%D \module
%D   [       file=page-app, % from meta-fig
%D        version=1998.01.15,
%D          title=\CONTEXT\ Core Macros,
%D       subtitle=Independent page building,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

\writestatus{loading}{Context Page Macros / Applications}

%D The fitting page code is moved from \type {meta-fig} to
%D here.

\unprotect

\definepapersize
  [\??fp\s!dummy]
  [\c!width=\fittingwd,
   \c!height=\fittinght]

\definelayout
  [\??fp\s!dummy]
  [\c!width=\fittingwd,\c!height=\fittinght,\c!location=\v!middle,
   \c!topspace=\!!zeropoint,\c!backspace=\!!zeropoint,
   \c!cutspace=\!!zeropoint,\c!bottomspace=\!!zeropoint,
   \c!textdistance=\!!zeropoint,\c!lines=0,\c!grid=\v!no,
   \c!top=\!!zeropoint,\c!bottom=\!!zeropoint,
   \c!margin=\!!zeropoint,\c!edge=\!!zeropoint,
   \c!leftmargin=\!!zeropoint,\c!leftedge=\!!zeropoint,
   \c!rightmargin=\!!zeropoint,\c!rightedge=\!!zeropoint,
   \c!header=\!!zeropoint,\c!footer=\!!zeropoint]

\def\dostartfittingpage[#1][#2]%
  {\page % this is kind of tricky! there can be preceding page refs
   \bgroup % resulting in a zero height page; test fig-make !
   \def\currentfittingpage{#1}%
   \dontcomplain
   % runs under current page regime, i.e. page variables passed to mp
   \getparameters[\currentfittingpage][\c!paper=,#2]% auto or size or nothing
   \setbox\scratchbox\hbox
     \bgroup
     % needed later \getparameters[\currentfittingpage][\c!paper=,#2]% auto or size or nothing
     \doifvalue{\currentfittingpage\c!margin}\v!page % undocumented
       {\offsetbox
          [\c!leftoffset=\backspace,
           \c!rightoffset=\cutspace,
           \c!topoffset=\topspace,
           \c!bottomoffset=\bottomspace]\hbox}%
     \bgroup
     \scale[\c!scale=\getvalue{\currentfittingpage\c!scale}]%
     \bgroup\localframed[\currentfittingpage]%
     \bgroup}

\def\dostopfittingpage
  {\egroup % localframed
   \egroup % scale
   \egroup % offsetbox
   \egroup % scratchbox
   \edef\fittingwd{\the\wd\scratchbox}%
   \edef\fittinght{\the\ht\scratchbox}%
   \startlocallayout
   \ifdim\fittinght<\lineheight
     % write status : too small
     \setbox\scratchbox\vbox to \lineheight{\vss\box\scratchbox\vss}%
     \edef\fittinght{\the\lineheight}%
   \fi
   \let\checkcurrentlayout\relax % else interference with odd/even layout
   \processaction
     [\getvalue{\currentfittingpage\c!paper}]
     [   \v!auto=>\let\fittingpapersize\printpapersize,
      \s!unknown=>\let\fittingpapersize\commalistelement,
      \s!default=>\def\fittingpapersize{\??fp\s!dummy}]%
   \expanded{\setuppapersize[\??fp\s!dummy][\fittingpapersize]}%
   \definelayout
     [\v!page]%
     [\c!location=\v!middle,
      \c!width=\fittingwd,
      \c!height=\fittinght]%
   \setuplayout
     [\v!page]%
   \startmakeup[\v!standard][\c!textstate=\v!empty,\c!doublesided=\v!no,\c!page=]%
     \centerbox{\box\scratchbox}%
   \stopmakeup
   \stoplocallayout
   \egroup}

%D \TEX\ pages (for \METAPOST\ pages, see \type {meta-fig}):

\presetlocalframed[\??tg]

\def\setupTEXpage
  {\dodoubleargument\getparameters[\??tg]}

\def\startTEXpage
  {\dosingleempty\dostartTEXpage}

\def\dostartTEXpage[#1]%
  {\dostartfittingpage[\??tg][#1]\gobblespacetokens}

\def\stopTEXpage
  {\removelastspace
   \dostopfittingpage}

\setupTEXpage
  [\c!scale=1000,
   \c!strut=\v!no,
   \c!align=\v!normal, % needed, else problems !
   \c!offset=\v!overlay,
   \c!width=\v!fit,
   \c!height=\v!fit,
   \c!frame=\v!off]

%D Application pages (for an example, see \type {m-pstric}):

\def\@@texapp{texapp}
\def\@@texdim{texdim}

\def\saveTEXapplication#1#2%
  {\immediate\openout\scratchwrite=\bufferprefix\@@texdim.tmp
   \immediate\write\scratchwrite{\dimen#1=\the\ht\scratchbox}%
   \immediate\write\scratchwrite{\dimen#2=\the\wd\scratchbox}%
   \immediate\closeout\scratchwrite}

\def\restoreTEXapplication
  {\readlocfile{\bufferprefix\@@texdim.tmp}\donothing\donothing}

\def\startTEXapplication
  {\dosingleempty\dostartTEXapplication}

\long\def\dostartTEXapplication[#1]#2#3\stopTEXapplication
  {\bgroup
   \bgroup
   \let\f!temporaryextension\c!tex
   \setbuffer[\@@texapp]%
     \starttext
     #2% preamble
     \startTEXpage[#1]%
       \topskip\zeropoint
       \setbox\scratchbox\hbox{#3}%
       \saveTEXapplication02% dimensions
       \box\scratchbox
     \stopTEXpage
     \stoptext
   \endbuffer
   \egroup
   \doifelse\jobsuffix{dvi}\donetrue\donefalse
   \executesystemcommand{texexec \bufferprefix\@@texapp.tex --once --batch}%
   \ifdone % eps
     \executesystemcommand{dvips -E* -o \@@texapp.eps \@@texapp}%
   \else % pdf
     \executesystemcommand{dvips \bufferprefix\@@texapp}%
     \executesystemcommand{ps2pdf \bufferprefix\@@texapp.ps \bufferprefix\@@texapp.pdf}%
   \fi
   \restoreTEXapplication % dimensions
   \setbox\scratchbox\hbox
     {\expanded{\externalfigure
        [\bufferprefix\@@texapp.\ifdone eps\else pdf\fi]
        [\c!object=\v!no]}}%
   \setbox\scratchbox\hbox
     {\lower\ht\scratchbox\hbox{\raise\dimen2\box\scratchbox}}%
   \wd\scratchbox\dimen0
   \ht\scratchbox\dimen2
   \dp\scratchbox\zeropoint
   \box\scratchbox
   \egroup}

\protect \endinput
