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%D \module
%D [ file=node-par,
%D version=2008.09.30,
%D title=\CONTEXT\ Node Macros,
%D subtitle=Paragraph Building,
%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 Node Macros / Paragraph Building}
%D This is very experimental, undocumented, subjected to changes, etc. just as
%D the underlying interfaces.
% \enableparbuilders
%
% \startparbuilder[default]
% \input tufte \par
% \startparbuilder[oneline]
% \input tufte \par
% \stopparbuilder
% \input tufte \par
% \stopparbuilder
\unprotect
\registerctxluafile{node-par}{1.001}
\definesystemattribute[parbuilder][public]
% todo auto-enable
% management (enable/disable) is global and will move to lua
\installcorenamespace {parbuilder}
\newcount\c_node_paragraphs_n_of_builders
\let\m_node_paragraphs_current_builder\empty
\unexpanded\def\defineparbuilder[#1]%
{\global\advance\c_node_paragraphs_n_of_builders\plusone
\ctxlua{builders.paragraphs.constructors.register("#1",\number\c_node_paragraphs_n_of_builders)}%
\setxvalue{\??parbuilder#1}{\attribute\parbuilderattribute\number\c_node_paragraphs_n_of_builders}}
\unexpanded\def\startparbuilder[#1]%
{\edef\m_node_paragraphs_current_builder{\number\attribute\parbuilderattribute}%
\globalpushmacro\m_node_paragraphs_current_builder
\getvalue{\??parbuilder#1}\relax
\node_paragraphs_builders_check}
\unexpanded\def\stopparbuilder
{\ifhmode\par\fi
\globalpopmacro\m_node_paragraphs_current_builder
\attribute\parbuilderattribute\m_node_paragraphs_current_builder\relax
\node_paragraphs_builders_check}
\unexpanded\def\setmainparbuilder[#1]%
{\ctxlua{builders.paragraphs.constructors.set("#1")}}
% no high level interface, after all implementing a linebreaker is not something that
% the average user will do
\defineparbuilder[default] % just for testing
\defineparbuilder[oneline] % just for testing
\defineparbuilder[basic] % just for testing
\def\enableparbuilders {\ctxlua{builders.paragraphs.constructors.enable ()}}
\def\disableparbuilders{\ctxlua{builders.paragraphs.constructors.disable()}}
\def\node_paragraphs_builders_check % can be made more efficient as we don't want to do this too often
{\ifcase\attribute\parbuilderattribute
\disableparbuilders
\else
\enableparbuilders
\fi}
\protect \endinput
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