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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 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 / Kerning}
\unprotect
\registerctxluafile{typo-krn}{1.001}
\definesystemattribute[kern][public]
% more
%
% {\setcharacterkerning[extrakerning]\input davis\relax}
\installcorenamespace{characterkerning}
\installcommandhandler \??characterkerning {characterkerning} \??characterkerning
\unexpanded\def\setcharacterkerning[#1]%
{\edef\currentcharacterkerning{#1}%
\ifx\currentcharacterkerning\s!reset
\resetcharacterkerning
\else
\typo_kerning_set
\fi}
% \def\typo_kerning_set
% {\ctxcommand{setcharacterkerning(\characterkerningparameter\c!factor)}}
\def\typo_kerning_set
{\usecharacterkerningstyleandcolor\c!style\c!color % goodie, maybe also strut
\ctxcommand{setcharacterkerning(\characterkerningparameter\c!factor)}}
\unexpanded\def\resetcharacterkerning % fast one
{\attribute\kernattribute\attributeunsetvalue}
\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 always 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]
% Here we need to keep the groupedcommand solution as it is
% used as modifier.
\unexpanded\def\kerncharacters
{\doifnextoptionalelse\typo_kerning_apply_yes\typo_kerning_apply_nop}
\def\typo_kerning_apply_yes[#1]%
{\groupedcommand{\typo_kerning_apply_yes_indeed{#1}}\donothing}
\def\typo_kerning_apply_nop
{\groupedcommand\typo_kerning_apply_nop_indeed\donothing}
\def\typo_kerning_apply_yes_indeed#1%
{\let\currentcharacterkerning\v!kerncharacters
\setupcurrentcharacterkerning[\c!factor=#1]%
\typo_kerning_set}
\def\typo_kerning_apply_nop_indeed
{\let\currentcharacterkerning\v!kerncharacters
\typo_kerning_set}
\protect \endinput
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