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%D \module
%D [ file=anch-snc,
%D version=2003.12.01, % actually 1999 so real old
%D title=\CONTEXT\ Anchoring Macros,
%D subtitle=Synchronization,
%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 is a rather old mechanism that we once needed in an actually nice design.
%D Those were the times that processing a rather complex xml file with \PDFTEX\ into
%D a 400 page document took 45 minutes (a few runs) while nowadays with luatex and
%D \MKIV\ (and \LMTX) we express runtime in seconds.
%D
%D In retrospect it was a waste of time (and money) to invest in all these
%D mechanisms because the publishers we were dealign with were far from ready for
%D dealing with xml and let alone automatic rendering. But, as the code still worked
%D well after nearly two decades I decided to revive it .. maybe some curious
%D \CONTEXT\ user can benefit from it after all.
%D
%D The logic is mostly the same as in \MKII\ but some work is now delegated to \LUA\
%D so that we save memory and gain some runtime. As this was not really a used
%D module the interface also was upgraded. As we know the bottlenecks in \METAPOST\
%D we also work around those a bit. It made sense too change the interface to use
%D the new \LMTX\ mechanisms for passing parameters. The old interface can be found
%D in the \MKII\ and \MKIV\ files.
%D TODO: bleed | autobleed
\writestatus{loading}{ConTeXt Anchoring Macros / Synchronization}
\registerctxluafile{anch-snc}{}
\registerctxluafile{mlib-snc}{}
%D \stoptyping
%D \starttext
%D
%D \setuplayout[location=middle]
%D \setupbodyfont[dejavu]
%D
%D \definesyncpositions[1]
%D \definesyncpositions[2]
%D
%D % \startuseMPgraphic{sync1}
%D % StartPage ;
%D % lmt_synchronizer [ ... ] ;
%D % clip currentpicture to Page ;
%D % setbounds currentpicture to Page ;
%D % StopPage ;
%D % \stopuseMPgraphic
%D
%D \startuseMPgraphic{sync1}
%D lmt_synchronizer [
%D % page = "yes",
%D index = 1,
%D hoffset = 0,
%D width = BackSpace - LeftMarginDistance,
%D extend = false,
%D prune = true,
%D draw = false,
%D fill = true,
%D ] ;
%D \stopuseMPgraphic
%D
%D \startuseMPgraphic{sync2}
%D lmt_synchronizer [
%D index = 2,
%D region = OverlayRegion,
%D hoffset = -1cm,
%D width = 1cm,
%D extend = true,
%D prune = false,
%D draw = false,
%D fill = true,
%D ] ;
%D clip currentpicture to OverlayBox leftenlarged 1cm;
%D setbounds currentpicture to OverlayBox ;
%D \stopuseMPgraphic
%D
%D \defineoverlay[tempoverlay1][\useMPgraphic{sync1}]
%D \defineoverlay[tempoverlay2][\useMPgraphic{sync2}]
%D
%D \setupbackgrounds[page][background=tempoverlay1]
%D
%D \framed[region=yes,background=tempoverlay2,width=14cm,align=normal]{%
%D \syncposition[2][1]\samplefile{ward}\endgraf
%D \syncposition[2][2]\samplefile{ward}\endgraf
%D \syncposition[2][3]\samplefile{ward}\endgraf
%D }
%D
%D \vskip1cm \hskip1cm \framed[region=yes,background=tempoverlay2,width=16cm,align=normal]{%
%D \syncposition[2][1]\samplefile{ward}\endgraf
%D \syncposition[2][2]\samplefile{ward}\endgraf
%D \syncposition[2][3]\samplefile{ward}\endgraf
%D }
%D
%D \vskip1cm \hskip1cm \framed[region=yes,background=tempoverlay2,width=10cm,align=normal]{%
%D \syncposition[2][1]\samplefile{ward}\endgraf
%D \syncposition[2][2]\samplefile{ward}\endgraf
%D \syncposition[2][3]\samplefile{ward}\endgraf
%D }
%D
%D \dorecurse {100} {
%D \startchapter[title={Test #1}]
%D \syncposition[1][1,reset]\dorecurse{20}{\samplefile{ward}\endgraf}
%D \syncposition[1][2]\dorecurse {4}{\samplefile{ward}\endgraf}
%D \syncposition[1][3]\dorecurse {7}{\samplefile{ward}\endgraf}
%D \syncposition[1][4]\dorecurse {3}{\samplefile{ward}\endgraf}
%D \stopchapter
%D }
%D
%D \dorecurse {100} {
%D \startchapter[title={Test #1}]
%D \syncposition[1][1]\dorecurse{1}{\samplefile{ward}\endgraf}
%D \syncposition[1][2]\dorecurse{1}{\samplefile{ward}\endgraf}
%D \syncposition[1][3]\dorecurse{1}{\samplefile{ward}\endgraf}
%D \syncposition[1][4]\dorecurse{1}{\samplefile{ward}\endgraf}
%D \stopchapter
%D }
%D
%D \stoptext
%D \stoptyping
%D We could actually use par positions but in \LMTX\ we have syncpos entries
%D somewhat optimized.
\unprotect
\installcorenamespace{syncposcounter}
\let\c_sync_n\relax
\permanent\protected\def\definesyncpositions[#1]%
{\ifcsname\??syncposcounter:#1\endcsname \else
\expandafter\newcount\csname\??syncposcounter:#1\endcsname
\fi}
\permanent\tolerant\protected\def\syncposition[#1]#*[#2]%
{\dontleavehmode
\ifcsname\??syncposcounter:#1\endcsname
\let\c_sync_n\lastnamedcs
\global\advance\c_sync_n\plusone
\enabletextarearegistration
\setpositionplus{\s!syncpos:#1:\the\c_sync_n}{#2}\hpack{\strut}%
\else
\strut
\fi
\ignorespaces}
\protect
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