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%D \module
%D [ file=s-fonts-features, % was s-fnt-41, s-fnt-27
%D version=2012.11.27, % 2010.02.22
%D title=\CONTEXT\ Style File,
%D subtitle=Features,
%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.
\startmodule[fonts-features]
\registerctxluafile{s-fonts-features}{}
\installmodulecommandluasingle \showusedfeatures {moduledata.fonts.features.showused}
\installmodulecommandluasingle \showallkerns {moduledata.fonts.features.showallkerns}
\installmodulecommandluasingle \showbasekerns {moduledata.fonts.features.showbasekerns}
\installmodulecommandluasingle \showfeatureset {moduledata.fonts.features.showfeatureset}
\def\kernpairheight{.8\strutht}
\def\kernpairdepth {.8\strutdp}
\def\kernpairwidth {\onepoint}
\unexpanded\def\showkernpair#1#2#3% first kern second
{\dontleavehmode
\hbox \bgroup
\scratchdimen#2\scaledpoint
\kern\fontcharwd\font#1\relax
\ifdim\scratchdimen>\zeropoint
\bgroup
\darkgreen
\vrule width \scratchdimen height \kernpairheight depth \kernpairdepth
\egroup
\kern-\scratchdimen
\else\ifdim\scratchdimen<\zeropoint
\kern\scratchdimen
\bgroup
\darkred
\vrule width -\scratchdimen height \kernpairheight depth \kernpairdepth
\egroup
\else
\kern-.5\dimexpr\kernpairwidth\relax
\bgroup
\darkblue
\vrule width \kernpairwidth height \kernpairheight depth \kernpairdepth
\egroup
\kern-.5\dimexpr\kernpairwidth\relax
\fi\fi
\kern-\fontcharwd\font#1\relax
\char#1\relax
\char#3\relax
\egroup
\space}
\stopmodule
\continueifinputfile{s-fonts-features.mkiv}
\usemodule
[art-01]
\starttext
\showusedfeatures \page
\definefontfeature[default-base][default][mode=base]
\start
\definedfont[Serif*default-base]
\showbasekerns
\page
\stop
\start
\bf
\showallkerns
\page
\stop
\stoptext
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