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%D \module
%D [ file=typo-bld, % was node-par,
%D version=2008.09.30,
%D title=\CONTEXT\ Typesetting 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 Typesetting Macros / Paragraph Building}
%D This is very experimental, undocumented, subjected to changes, etc. just as
%D the underlying interfaces. But at least it's cleaned as part of the status-mkiv
%D cleanup.
% \enabletrackers[builders.hpack.overflow]
% \enabletrackers[builders.hpack.quality]
% \enabletrackers[builders.vpack.quality]
% \startparbuilder[default]
% \input tufte \par
% \startparbuilder[oneline]
% \input tufte \par
% \stopparbuilder
% \input tufte \par
% \stopparbuilder
%
% \startparbuilder[oneline]
% \dorecurse{100}{\input ward \par}
% \stopparbuilder
% \startluacode
% function builders.paragraphs.constructors.methods.preroll_a(head)
% local result, info = tex.linebreak(head)
% tex.prevdepth = info.prevdepth
% tex.prevgraf = info.prevgraf
% return result
% end
% function builders.paragraphs.constructors.methods.preroll_b(head)
% local result, info = tex.linebreak(nodes.nuts.copylist(head))
% return true
% end
% \stopluacode
%
% \defineparbuilder[preroll_a]
% \defineparbuilder[preroll_b]
%
% \starttext
% \setmainparbuilder[default] \input tufte \par \input tufte \page
% \setmainparbuilder[preroll_a] \input tufte \par \input tufte \page
% \setmainparbuilder[preroll_b] \input tufte \par \input tufte \page
% \stoptext
\unprotect
\registerctxluafile{typo-bld}{autosuffix}
\definesystemattribute[parbuilder][public]
\installcorenamespace {parbuilder}
\permanent\protected\def\defineparbuilder [#1]{\clf_defineparbuilder{#1}}
\permanent\protected\def\setmainparbuilder[#1]{\clf_setparbuilder{#1}}
\permanent\protected\def\startparbuilder [#1]{\ifhmode\par\fi\clf_startparbuilder{#1}}
\permanent\protected\def\stopparbuilder {\ifhmode\par\fi\clf_stopparbuilder}
%D There is no high level interface because after all implementing a linebreaker
%D is not something that the average user will do.
\defineparbuilder[default] % just for testing
\defineparbuilder[oneline] % just for testing
\defineparbuilder[basic] % just for testing
%D This hooks in otr so we need to pickup.
\permanent\protected\def\enableparbuilders {\clf_enableparbuilder } % can be public implementor
\permanent\protected\def\disableparbuilders{\clf_disableparbuilder} % can be public implementor
\protect \endinput
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