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%D \module
%D [ file=typo-krn,
%D version=2009.03.27, % code moved from core-spa.mkiv
%D title=\CONTEXT\ Typesetting Macros,
%D subtitle=Spacing,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright=\PRAGMA]
%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 / Kerning}
\unprotect
\registerctxluafile{typo-krn}{1.001}
\definesystemattribute[kern] \chardef\kernattribute\dogetattributeid{kern}
% more
%
% {\setcharacterkerning[extrakerning]\input davis\relax}
\unexpanded\def\definecharacterkerning
{\dodoubleargument\dodefinecharacterkerning}
\def\dodefinecharacterkerning[#1][#2]%
{\getparameters[\??ck#1][\c!factor=0.125,#2]%
\setuvalue{\??ck:#1}{\dosetcharacterkerning{#1}}}
\unexpanded\def\setupcharacterkerning
{\dodoubleargument\dosetupcharacterkerning}
\def\dosetupcharacterkerning[#1][#2]%
{\ifcsname\??ck:#1\endcsname
\getparameters[\??ck#1][#2]%
\else
\dodefinecharacterkerning[#1][#2]% bonus
\fi}
\unexpanded\def\dosetcharacterkerning#1%
{\ctxlua{typesetting.kerns.set(\csname\??ck#1\c!factor\endcsname)}}
\unexpanded\def\setcharacterkerning[#1]%
{\csname\??ck:#1\endcsname}
\unexpanded\def\resetcharacterkerning % fast one
{\attribute\kernattribute\attributeunsetvalue}
\letvalue{\??ck\s!reset\c!factor}\attributeunsetvalue % trick
\appendtoks
\resetcharacterkerning
\to \everyresettypesetting
\definecharacterkerning [extrakerning] [\c!factor=.125] % used in manuals
%D Added after discussion on list (posted by WS, adapted abit by HH)
%D \unknown\ this needs to be interfaced (\type {\v!kerncharacters}).
%D
%D \starttyping
%D \setuphead[section][style=\sca,textstyle={\kerncharacters[.5]}] \section{Section}
%D \stoptyping
%D
%D We could combine this with the previous definition command but
%D then we alwasy would get a command defined which is not beforehand
%D a good idea.
\def\v!kerncharacters{kerncharacters} % no time now for translations
\definecharacterkerning [\v!kerncharacters] [\c!factor=.125]
\unexpanded\def\kerncharacters
{\dosingleempty\dokerncharacters}
\def\dokerncharacters[#1]%
{\groupedcommand{\dodokerncharacters{#1}}\donothing}
\def\dodokerncharacters#1%
{\iffirstargument
\setupcharacterkerning[\v!kerncharacters][\c!factor=#1]%
\fi
\setcharacterkerning[\v!kerncharacters]}
\protect \endinput
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