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%D \module
%D [ file=page-blk,
%D version=2022.06.04,
%D title=\CONTEXT\ Page Macros,
%D subtitle=Shuffling Pages,
%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.
\writestatus{loading}{ConTeXt Page Macros / Shuffling pages}
%D This is a somewhat tricky module and although we have a somewhat abstract
%D interface we are pretty much bound to \PDF\ output here. When large amounts of
%D documents are to be generated and|/|or when saving a run makes sense the table
%D of contents can be typeset at the end and moved to the beginning. However, it
%D assumes a rather stable and predictable rendering. Don't use this without
%D checking it really works out well.
%D
%D The low level backend code has been around for quite a while but we never had
%D a real (need and therefore) interface for it. There actually is not that much
%D code involved anyway. There is no need to backport it to \MKIV.
\registerctxluafile{page-blk}{autosuffix}
% Musical timestamp: end May 2022 xpropaganda (in loop mode to keep the pace).
% pitfalls: we need to keep the toc in order (or generate it 'manually' based on
% deltas but even then we get the numbers wrong)
\unprotect
\newinteger\c_pages_prerolled
\permanent\protected\def\startpageblock[#1]%
{\page
\clf_startpageblock{#1}}
\permanent\protected\def\stoppageblock
{\page
\clf_stoppageblock}
\permanent\protected\def\flushpageblocks[#1]%
{\page
\clf_flushpageblocks{#1}}
\permanent\def\pageblockrealpage#1%
{\clf_pageblockrealpage{#1}}
\tolerant\permanent\protected\def\startprerollpageblock[#1]%
{\page
\clf_startprerollpageblock{#1}%
\global\c_pages_prerolled\realpageno % hack
\setuppaper[\c!method=\v!none]}
\permanent\protected\def\stopprerollpageblock
{\page
\clf_stopprerollpageblock
\setcounter[realpage][\c_pages_prerolled]% hack
\setuppaper[\c!method=\v!normal]}
\permanent\def\prerolledpages#1%
{\clf_prerolledpages{#1}}
\protect \endinput
\usemodule[article-basic]
\setupinteraction[state=start]
% \enabletrackers[*reference*]
% \enabletrackers[*destination*]
\useMPlibrary[dum]
\starttext
\def\AlphaOffset{0}
\def\BetaOffset {0}
% the flexible ones (can come from files)
\startbuffer[alpha]
\startchapter[title=Alpha]
\dorecurse{20}{\samplefile{tufte}\par}
\stopchapter
\stopbuffer
\startbuffer[beta]
\startchapter[title=Beta]
\dorecurse{6}{\samplefile{tufte}\par}
\stopchapter
\stopbuffer
% the fixed ones
\startbuffer[gamma]
\startchapter[title=Gamma]
\externalfigure[whatever-dummy-3][width=\textwidth]
\stopchapter
\stopbuffer
\startbuffer[rest]
\startchapter[title=Rest A]
\samplefile{tufte}
\stopchapter
\startchapter[title=Rest B]
\samplefile{tufte}
\blank
Alpha : \goto{page \AlphaPages}[realpage(\AlphaPages)]\par
Beta : \goto{page \BetaPages }[realpage(\BetaPages )]
\stopchapter
\stopbuffer
\startbuffer[contents]
\starttitle[title=Contents]
\placelist[chapter][criterium=text]
\stoptitle
\stopbuffer
% Preroll.
\startprerollpageblock[alpha]
\start
\setuphead[chapter][incrementnumber=no]
\getbuffer[alpha]
\stop
\stopprerollpageblock
% \writestatus{!!!!!}{nofalphapages: \prerolledpages{alpha}}
\startprerollpageblock[beta]
\start
\setuphead[chapter][incrementnumber=no]
\getbuffer[beta]
\stop
\stopprerollpageblock
% \writestatus{!!!!!}{nofbetapages: \prerolledpages{beta}}
% Some titling.
\startpageblock[titlepage]
\startstandardmakeup
\externalfigure[whatever-dummy-1][height=\textheight,width=\textwidth]
\stopstandardmakeup
\stoppageblock
\startpageblock[boguspage]
\startstandardmakeup
\externalfigure[whatever-dummy-2][height=\textheight,width=\textwidth]
\stopstandardmakeup
\stoppageblock
% The contents will end up here.
% page 1
% The main document.
\setuppagenumber[number=2]
\startpageblock[chapters]
% we have a predictable rest:
\edef\AlphaPages{\the\numexpr 4 \relax}
\edef\BetaPages {\the\numexpr 4 + \prerolledpages{alpha} \relax}
\getbuffer[rest]
\getbuffer[alpha]
\getbuffer[beta]
\getbuffer[gamma]
\stoppageblock
% This one will move:
\setuppagenumber[number=1]
\startpageblock[contents]
\getbuffer[contents]
\stoppageblock
\flushpageblocks
[titlepage,
boguspage,
contents,
chapters]
\stoptext
|
