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%D \module
%D [ file=page-str,
%D version=2010.03.13, % 2006.03.21,
%D title=\CONTEXT\ Page Macros,
%D subtitle=Page Streams,
%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 / Page Streams}
%D The first version of this component of \CONTEXT\ was written
%D for Thomas Schmitz who asked for parallel page streams. While
%D playing with the code, I decided to make it into a component
%D that can be used to construct all kind of stream related
%D mechanisms. Because I could apply this feature in a project,
%D there is some additional code here (related to graphics).
%D
%D These macros were written while listening to and watching the DVD
%D \quotation {Rush In Rio}.
%D
%D The reimplementation (or rather experimenting with the complete
%D rewrite) was done while looping over \quotation {Wende Snijders
%D No.9}.
%D
%D Remark: marknotes are gone, at least for a while.
\registerctxluafile{page-str}{1.001}
\unprotect
\let \currentoutputstream \empty
\newif \ifinoutputstream % will become a conditional or mode
\newtoks \everyenableoutputstream
\appendtoks
\page_otr_command_flush_side_floats
\to \everyenableoutputstream
\unexpanded\def\initializeoutputstreams
{\clf_initializestream
\glet\initializeoutputstreams\relax}
\unexpanded\def\enableoutputstream[#1]% could be \startoutputsubstream
{\initializeoutputstreams
\the\everyenableoutputstream
\inoutputstreamtrue
\xdef\currentoutputstream{#1}%
\clf_enablestream{#1}}
\unexpanded\def\disableoutputstream
{\inoutputstreamfalse
\global\let\currentoutputstream\s!default
\clf_disablestream}
\unexpanded\def\startoutputstream[#1]%
{\begingroup
\initializeoutputstreams
\the\everyenableoutputstream
\inoutputstreamtrue
\xdef\currentoutputstream{#1}%
\clf_startstream{#1}}
\unexpanded\def\stopoutputstream
{\clf_stopstream
\endgroup}
\unexpanded\def\startoutputsubstream[#1]% just push/pop instead
{\globalpushmacro\currentoutputstream
\enableoutputstream[#1]}
\unexpanded\def\stopoutputsubstream
{\globalpopmacro\currentoutputstream
\enableoutputstream[\currentoutputstream]}
\def\flushoutputstream [#1]{\clf_flushstream{#1}}
\def\outputstreambox [#1]{\vbox{\clf_flushstream{#1}}}
\def\outputstreamcopy [#1]{\vbox{\clf_flushstreamcopy{#1}}}
\def\outputstreamunvbox [#1]{\clf_flushstream{#1}}
\def\outputstreamunvcopy[#1]{\clf_flushstreamcopy{#1}}
\def\synchronizestreams [#1]{\clf_synchronizestream{#1}}
\def\dopushoutputstream [#1]{\clf_pushstream{#1}}
\unexpanded\def\pushoutputstream
{\dosingleempty\dopushoutputstream}
% \unexpanded\def\defineoutputstream[#1]%
% {\doifundefined{otrs:#1}{\expandafter\newbox\csname otrs:#1\endcsname}}
%
% \def\useoutputstream[#1]%
% {\writestatus{otr}{using output stream #1}%
% \xdef\currentoutputstream{#1}}
%
% \directsetup{stream:\firstoutputstream:set}
% \directsetup{stream:\firstoutputstream:top}
% \directsetup{stream:\firstoutputstream:bottom}
% \directsetup{stream:\firstoutputstream:reset}
% Obsolete in \MKIV:
%
% \unexpanded\def\definemarknote
% {\dodoubleempty\dodefinemarknote}
%
% \def\dodefinemarknote[#1][#2]{}
% \def\setmarknote [#1]{\gobbleoneargument}
% \def\flushmarknotes [#1]{}
% \def\erasemarknotes [#1]{}
\protect \endinput
% \enabletrackers[streams.flushing]
%
% \setuplayout[grid=yes] \showgrid
%
% \starttext
%
% \input tufte
%
% \startoutputstream[nl]
%
% Wat doen we hier?
%
% \enableoutputstream[en]
%
% Are you sleeping, brother John?\footnote{xxx}
%
% \dorecurse{4}{x \footnote{note \recurselevel}\input tufte \par \pushoutputstream}
%
% \enableoutputstream[de]
%
% Bruder Jakob, schläfst du noch?\footnote{yyy}
%
% \dorecurse{4}{x \footnote{note \recurselevel}\input ward \par \pushoutputstream}
%
% \disableoutputstream
%
% \stopoutputstream
%
% Vader Jacob, slaap je nog?\footnote{zzz}
%
% \input tufte
%
% \synchronizestreams[en,de,nl]
%
% \page \flushoutputstream[en] \input knuth
% \page \flushoutputstream[de] \input knuth
% \page \flushoutputstream[nl] \input knuth
%
% \stoptext
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