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%D \module
%D [ file=spac-par,
%D version=2009.10.16, % 1997.03.31, was core-spa.tex
%D title=\CONTEXT\ Spacing Macros,
%D subtitle=Paragraphs,
%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 Spacing Macros / Paragraphs}
\unprotect
%D The dreadful sequence \type {\bgroup} \unknown\
%D \type {\carryoverpar} \unknown\ \type {\egroup} is needed
%D when for instance sidefloats are used in combination with
%D something that starts with a group. This is because
%D otherwise the indentation as set (by the output routine)
%D inside the group are forgotten afterwards. (I must
%D not forget its existence).
\def\carryoverpar#1% #1 can be \endgroup or \egroup or ... expandable !
{\normalexpanded
{\noexpand#1%
\hangindent\the\hangindent
\hangafter \the\hangafter
\parskip \the\parskip
\leftskip \the\leftskip
\rightskip \the\rightskip}}
\unexpanded\def\pushparagraphproperties
{\edef\currentparagraphproperties{\carryoverpar\relax}%
\pushmacro\currentparagraphproperties}
\unexpanded\def\popparagraphproperties
{\popmacro\currentparagraphproperties
\currentparagraphproperties}
\unexpanded\def\flushparagraphproperties
{\popmacro\currentparagraphproperties}
% Beware, changing this will break some code (like pos/backgrounds) but
% it has been changed anyway so let's see where things go wrong.
\installcorenamespace{paragraphintro}
\let\insertparagraphintro\relax % hook into everypar
\newtoks\t_spac_paragraphs_intro_first
\newtoks\t_spac_paragraphs_intro_next
\newtoks\t_spac_paragraphs_intro_each
\newconditional\c_spac_paragraphs_intro_first
\newconditional\c_spac_paragraphs_intro_next
\newconditional\c_spac_paragraphs_intro_each
\unexpanded\def\setupparagraphintro
{\dodoubleempty\spac_paragraphs_intro}
\unexpanded\def\spac_paragraphs_intro[#1][#2]%
{\def\spac_paragraphs_intro_step##1%
{\csname\??paragraphintro\ifcsname\??paragraphintro##1\endcsname##1\fi\endcsname{#2}}%
\processcommacommand[#1]\spac_paragraphs_intro_step}
\letvalue{\??paragraphintro\empty}\gobbleoneargument
\setvalue{\??paragraphintro\v!reset}#1%
{\global\setfalse\c_spac_paragraphs_intro_first
\global\setfalse\c_spac_paragraphs_intro_next
\global\setfalse\c_spac_paragraphs_intro_each
\global\t_spac_paragraphs_intro_first\emptytoks
\global\t_spac_paragraphs_intro_next \emptytoks
\global\t_spac_paragraphs_intro_each \emptytoks
\glet\insertparagraphintro\relax}
\setvalue{\??paragraphintro\v!first}#1%
{\global\settrue\c_spac_paragraphs_intro_first
\global\t_spac_paragraphs_intro_first\expandafter{\the\t_spac_paragraphs_intro_first#1}%
\glet\insertparagraphintro\spac_paragraphs_flush_intro}
\setvalue{\??paragraphintro\v!next}#1%
{\global\settrue\c_spac_paragraphs_intro_next
\global\t_spac_paragraphs_intro_next\expandafter{\the\t_spac_paragraphs_intro_next#1}%
\glet\insertparagraphintro\spac_paragraphs_flush_intro}
\setvalue{\??paragraphintro\v!each}#1%
{\global\settrue\c_spac_paragraphs_intro_each
\global\t_spac_paragraphs_intro_each\expandafter{\the\t_spac_paragraphs_intro_each#1}%
\glet\insertparagraphintro\spac_paragraphs_flush_intro}
%D We can say:
%D
%D \starttyping
%D \setupparagraphintro[first][\index{Knuth}]
%D \stoptyping
%D
%D Maybe more convenient is:
%D
%D \starttyping
%D \flushatparagraph{\index{Zapf}}
%D \stoptyping
%D
%D \starttyping
%D \setupparagraphintro[first][\hbox to 3.5em{\tt FIRST \hss}]
%D \setupparagraphintro[first][\hbox to 3.5em{\tt TSRIF \hss}]
%D \setupparagraphintro[next] [\hbox to 3.5em{\tt NEXT \hss}]
%D \setupparagraphintro[next] [\hbox to 3.5em{\tt TXEN \hss}]
%D \setupparagraphintro[each] [\hbox to 3.0em{\tt EACH \hss}]
%D \setupparagraphintro[each] [\hbox to 3.0em{\tt HCEA \hss}]
%D
%D some paragraph \par
%D some paragraph \par
%D some paragraph \par
%D some paragraph \par
%D
%D \setupparagraphintro[first][\hbox to 3.5em{\tt FIRST \hss}]
%D \setupparagraphintro[first][\hbox to 3.5em{\tt TSRIF \hss}]
%D
%D some paragraph \par
%D some paragraph \par
%D
%D \setupparagraphintro[reset]
%D
%D some paragraph \par
%D \stoptyping
\unexpanded\def\flushatparagraph#1%
{\global\c_spac_paragraphs_intro_first\plusone
\global\t_spac_paragraphs_intro_first\expandafter{\the\t_spac_paragraphs_intro_first#1}%
\glet\insertparagraphintro\spac_paragraphs_flush_intro}
%D Here comes the flusher (we misuse the one level expansion of token
%D registers to feed a nice stream into the paragraph.)
\unexpanded\def\spac_paragraphs_flush_intro % we make sure that the token lists expand directly after another
{\normalexpanded{% % so the first code is there twice
\ifconditional\c_spac_paragraphs_intro_each
\ifconditional\c_spac_paragraphs_intro_next
\glet\insertparagraphintro\spac_paragraphs_flush_intro_next
\else
\glet\insertparagraphintro\spac_paragraphs_flush_intro_each
\fi
\ifconditional\c_spac_paragraphs_intro_first
\global\setfalse\c_spac_paragraphs_intro_first
\global\t_spac_paragraphs_intro_first\emptytoks
\the\t_spac_paragraphs_intro_first
\fi
\the\t_spac_paragraphs_intro_each
\else
\ifconditional\c_spac_paragraphs_intro_next
\glet\insertparagraphintro\spac_paragraphs_flush_intro_next
\fi
\ifconditional\c_spac_paragraphs_intro_first
\global\setfalse\c_spac_paragraphs_intro_first
\global\t_spac_paragraphs_intro_first\emptytoks
\the\t_spac_paragraphs_intro_first
\fi
\fi}}
\unexpanded\def\spac_paragraphs_flush_intro_next
{\normalexpanded{%
\global\setfalse\c_spac_paragraphs_intro_next
\global\t_spac_paragraphs_intro_next\emptytoks
\ifconditional\c_spac_paragraphs_intro_each
\glet\insertparagraphintro\spac_paragraphs_flush_intro_each
\the\t_spac_paragraphs_intro_next
\the\t_spac_paragraphs_intro_each
\else
\glet\insertparagraphintro\relax
\the\t_spac_paragraphs_intro_next
\fi}}
\unexpanded\def\spac_paragraphs_flush_intro_each
{\the\t_spac_paragraphs_intro_each}
%D \macros
%D {flushatnextpar}
%D
%D This macro collects data that will be flushed at the next paragraph.
%D By using this macro you can avoid interfering nodes (writes, etc).
\let\flushpostponednodedata\relax % hook into everypar
\newbox\b_spac_postponed_data
\unexpanded\def\flushatnextpar
{\begingroup
\glet\flushpostponednodedata\spac_postponed_flush
\dowithnextboxcs\spac_postponed_finish\hbox}
\def\spac_postponed_finish
{\global\setbox\b_spac_postponed_data\hbox
{\box\b_spac_postponed_data\box\nextbox}%
\endgroup}
\def\spac_postponed_flush
{\ifvoid\b_spac_postponed_data\else
\hbox{\smashedbox\b_spac_postponed_data}%
\fi
\glet\flushpostponednodedata\relax}
\protect \endinput
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