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%D \module
%D [ file=page-mis,
%D version=2008.11.17, % was part of page-flt.tex / 2000.10.20
%D title=\CONTEXT\ Page Macros,
%D subtitle=Postponing,
%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 / Postponing}
\registerctxluafile{page-pst}{}
\unprotect
% postponing
\newevery\everytopofpage\relax
\appendtoks
\the\everytopofpage
\to \everystarttext
\appendtoks
\global\everytopofpage\emptytoks
\to \everystoptext
% \startpostponing [pagenumber] [+pageoffset]
%
% \startpostponing[2]
% PAGE 2 \blank
% \stoppostponing
%
% \startpostponing[+1]
% PAGE +1 \blank
% \stoppostponing
%
% \startpostponing[+2]
% PAGE +2 \blank
% \stoppostponing
%
% \starttext \dorecurse{4}{\input tufte \page} \stoptext
%D There is no real need to use \LUA\ here but the bookkeeping is somewhat easier
%D and we also can erase buffers easier when we keep a local cache, especially as we
%D can flush per page.
\newinteger \c_page_postponed_blocks_next_page % set at the lua end
\newconditional\c_page_postponed_busy
\mutable\lettonothing\currentpostponedpage
\permanent\protected\defcsname\e!start\v!postponing\endcsname
{\bgroup
\obeylines
\doifelsenextoptional{\egroup\page_postponed_blocks_start}{\egroup\page_postponed_blocks_start[0]}}
\permanent\protected\defcsname\e!stop\v!postponing\endcsname
{\clf_registerpostponedblock{\currentpostponedpage}\relax}
\def\page_postponed_blocks_start[#1]%
{\edef\currentpostponedpage{#1}%
\grabbufferdatadirect{postponedblock}{\e!start\v!postponing}{\e!stop\v!postponing}}
%D Officially we should flush again after a flush as there can be new future pages
%D but that will be looked into when we run into it.
\c_page_postponed_mode\plusone
\protected\def\page_postponed_blocks_flush_indeed
{\begingroup
\setsystemmode\v!postponing
\settrue\c_page_postponed_busy
\ifnum\c_page_postponed_mode=\plusone
\savepagecontent
\fi
\pagetotal\zeropoint % here? still needed? (was after flush pagefloats)
\the\everytopofpage\relax
%\flushrestfloats
\page_floats_flush_page_floats
\setnormalcatcodes % postponing in verbatim
\uncatcodespacetokens % postponing in startlines
\restoreglobalbodyfont % otherwise problems inside split verbatim
\clf_flushpostponedblocks
% page {123}
\relax
\page_otr_command_flush_floats % new but potential dangerous, maybe we need a classification
\ifnum\c_page_postponed_mode=\plusone
\flushpagecontent
\fi
\endgroup} % of blocks: with and without flush
\protected\def\page_postponed_blocks_flush
{\ifconditional\c_page_postponed_busy
% probably a nested flush
\orelse\ifnum\c_page_postponed_blocks_next_page=\zerocount
% nothing in cache
\orelse\ifnum\c_page_postponed_blocks_next_page<\zerocount
% generic cache
\page_postponed_blocks_flush_indeed
\orelse\ifnum\c_page_postponed_blocks_next_page>\realpageno
% future content
\else
% pending content
\page_postponed_blocks_flush_indeed
\fi}
\protect \endinput
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