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%D \module
%D [ file=t-lua-widow-control,
%D version=1.1.4, %%version
%D title=lua-widow-control,
%D subtitle=\ConTeXt module for lua-widow-control,
%D author=Max Chernoff,
%D date=2022-02-04, %%date
%D copyright=Max Chernoff,
%D license=MPL-2.0+,
%D url=https://github.com/gucci-on-fleek/lua-widow-control]
\startmodule[lua-widow-control]
\unprotect
\installnamespace{lwc}
\installcommandhandler \????lwc {lwc} \????lwc
\newdimen\lwcemergencystretch
\appendtoks
\lwcemergencystretch=\lwcparameter{emergencystretch}
\to\everysetuplwc
\appendtoks
\doifelse{\lwcparameter{\c!state}}\v!start{
\ctxlua{lwc.enable_callbacks()}
}{
\ctxlua{lwc.disable_callbacks()}
}
\to\everysetuplwc
\define\iflwc{\ctxlua{lwc.if_lwc_enabled()}}
\ctxloadluafile{lua-widow-control}
\setuplwc[emergencystretch=3em, \c!state=\v!start]
% We can't just set the penalties because they will be reset automatically
% at \\starttext.
\startsetups[*default]
\clubpenalty=1
\widowpenalty=1
\displaywidowpenalty=0
\interlinepenalty=0
\brokenpenalty=0
\stopsetups
\setups[*default]
% Here, we enable font expansion/contraction. It isn't strictly necessary for
% \lwc/'s functionality; however, it is required for the
% lengthened paragraphs to not have terrible spacing.
\definefontfeature[default][default][expansion=quality]
\setupalign[hz]
% Expansion of some parts of the document, such as section headings, is quite
% undesirable, so we'll disable \lwc/ for certain commands.
% We should only reenable \lwc/ at the end if it was already enabled.
\newif\iflwc@should@reenable
\define\lwc@patch@pre{\iflwc%
\lwc@should@reenabletrue%
\setuplwc[state=stop]%
\fi}
\define\lwc@patch@post{\iflwc@should@reenable%
\setuplwc[state=start]%
\fi}
\prependtoks\lwc@patch@pre\to\everybeforesectionheadhandle % Sectioning
\prependtoks\lwc@patch@post\to\everyaftersectionheadhandle
\protect
\stopmodule
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