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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}{autosuffix}
\definesystemattribute[kern][public]
% more
%
% {\setcharacterkerning[extrakerning]\input davis\relax}
\installcorenamespace{characterkerning}
\installcommandhandler \??characterkerning {characterkerning} \??characterkerning
\permanent\protected\def\setcharacterkerning[#1]%
{\edef\currentcharacterkerning{#1}%
\ifx\currentcharacterkerning\s!reset
\resetcharacterkerning
\else
\typo_kerning_set
\fi}
\def\typo_kerning_set
{\usecharacterkerningstyleandcolor\c!style\c!color % goodie, maybe also strut
\useaddfontfeatureparameter\characterkerningparameter
\clf_setcharacterkerning{\characterkerningparameter\c!factor}}
\permanent\protected\def\resetcharacterkerning % fast one
{\c_attr_kern\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) \unknown\ this
%D 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 then we always
%D would get a command defined which is not beforehand a good idea.
%D
%D Here we need to keep the groupedcommand solution as it is used as modifier.
\appendtoks
\frozen\instance\setuevalue{\currentcharacterkerning}%
{\doifelsenextoptional
{\typo_kerning_apply_yes{\currentcharacterkerning}}%
{\typo_kerning_apply_nop{\currentcharacterkerning}}}%
\to \everydefinecharacterkerning
\protected\def\typo_kerning_apply_yes#1[#2]%
{\groupedcommand{\typo_kerning_apply_yes_indeed{#1}{#2}}\donothing}
\protected\def\typo_kerning_apply_nop#1%
{\groupedcommand{\typo_kerning_apply_nop_indeed{#1}}\donothing}
\def\typo_kerning_apply_yes_indeed#1#2%
{\edef\currentcharacterkerning{#1}%
\setupcurrentcharacterkerning[\c!factor=#2]%
\typo_kerning_set}
\def\typo_kerning_apply_nop_indeed#1%
{\edef\currentcharacterkerning{#1}%
\typo_kerning_set}
\definecharacterkerning [\v!kerncharacters] [\c!factor=.125]
\definecharacterkerning [\v!letterspacing ] [\v!kerncharacters] [\c!features=letterspacing]
%D \macros
%D {stretched}
%D
%D Stretching characters in a word is a sort of typographical murder. Nevertheless
%D we support this manipulation for use in for instance titles.
%D
%D \starttyping
%D \hbox to 5cm{\stretched{to the limit}}
%D \stretched{to the limit}
%D \stretched[width=10cm]{to the limit}
%D \stoptyping
%D
%D \typebuffer
%D
%D or
%D
%D \startexample
%D \getbuffer
%D \stopexample
%D
%D \showsetup{stretched}
%D
%D This command replaces the old \MKII\ variant.
\definecharacterkerning
[\v!stretched]
[\c!factor=\v!max,
\c!width=\availablehsize]
\permanent\protected\def\setupstretched
{\setupcharacterkerning[\v!stretched]}
\pushoverloadmode
\enforced\permanent\tolerant\protected\def\stretched[#1]#:#2%
{\begingroup
\let\currentcharacterkerning\v!stretched
\ifparameter#1\or
\setupcurrentcharacterkerning[#1]%
\fi
\edef\p_width{\characterkerningparameter\c!width}%
\ifempty\p_width \else
\hbox to \p_width
\fi
\bgroup
\usecharacterkerningstyleandcolor\c!style\c!color
\useaddfontfeatureparameter\characterkerningparameter
\typo_kerning_set
#2%
\egroup
\endgroup}
\popoverloadmode
\protect \endinput
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