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%D \module
%D [ file=font-tra,
%D version=2009.01.02, % or so
%D title=\CONTEXT\ Font Macros,
%D subtitle=Tracing,
%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.
\unprotect
%D \macros
%D {showbodyfont}
%D
%D One can call for a rather simple overview of a bodyfont and the
%D relations between its alternative fonts.
%D
%D \showsetup{showbodyfont}
%D
%D The current bodyfont (here we omitted the argument) looks like:
%D
%D \showbodyfont
%D
%D The implementation is rather straightforward in using
%D \type{\halign}.
\fetchruntimecommand \showbodyfont {\f!fontprefix\s!run}
%D \macros
%D {showfontstrip, testminimalbaseline, showminimalbaseline}
%D
%D The next command can come in handy when combining
%D different fonts into a collection (typeface) and
%D determining optimal baseline distances.
%D
%D \showfontstrip \blank \showminimalbaseline
\fetchruntimecommand \showfontstrip {\f!fontprefix\s!run}
\fetchruntimecommand \testminimalbaseline {\f!fontprefix\s!run}
\fetchruntimecommand \showminimalbaseline {\f!fontprefix\s!run}
%D \macros
%D {showkerning}
%D
%D A goody is:
%D
%D \showkerning{Can you guess what kerning is?}
\fetchruntimecommand \showkerning {\f!fontprefix\s!run}
%D \macros
%D {showbodyfontenvironment,showfont,showfontstyle,showligatures}
%D
%D The current bodyfontenvironment is:
%D
%D \showbodyfontenvironment
%D
%D This overview is generated using:
%D
%D \showsetup{showbodyfontenvironment}
\fetchruntimecommand \showbodyfontenvironment {\f!fontprefix\s!run}
%D
%D The following command generates a fontmap:
%D
%D \startbuffer
%D \showfont[SansBold at 12pt]
%D \stopbuffer
%D
%D \typebuffer
%D \getbuffer
\fetchruntimecommand \showfont {\f!fontprefix\s!run}
\fetchruntimecommand \showfontstyle {\f!fontprefix\s!run}
\fetchruntimecommand \showligature {\f!fontprefix\s!run}
\fetchruntimecommand \showligatures {\f!fontprefix\s!run}
\fetchruntimecommand \showcharratio {\f!fontprefix\s!run}
\fetchruntimecommand \showfontparameters {\f!fontprefix\s!run}
\unexpanded\def\checkcharactersinfont {\ctxcommand{checkcharactersinfont()}}
\unexpanded\def\removemissingcharacters{\ctxcommand{removemissingcharacters()}}
\unexpanded\def\showchardata #1{\ctxcommand{showchardata("#1")}}
\unexpanded\def\showfontdata {\ctxcommand{showfontparameters()}}
%D \macros
%D {doiffontpresentelse}
%D
%D \starttyping
%D \doiffontpresentelse{texnansi-lmr10}{YES}{NO}
%D \doiffontpresentelse{adam-lindsay-modern-serif}{YES}{NO}
%D \stoptyping
\def\doiffontpresentelse#1{\ctxcommand{doifelse(fonts.names.exists("#1"))}}
% experimental, maybe this becomes a module
\newbox\otfcollector
\unexpanded\def\startotfcollecting{\ctxlua{nodes.tracers.steppers.start()}}
\unexpanded\def\stopotfcollecting {\ctxlua{nodes.tracers.steppers.stop()}}
\def\resetotfcollecting{\ctxlua{nodes.tracers.steppers.reset()}}
% Rather experimental:
%
% \page \showotfcomposition{arabtype*arab-default at 48pt}{-1}{الضَّرَّ} \page
% \page \showotfcomposition{arabtype*arab-default at 48pt}{-1}{لِلّٰهِ} \page
\def\showotfstepglyphs#1%
{\ctxlua{nodes.tracers.steppers.glyphs(\number\otfcollector,#1)}%
\unhbox\otfcollector}
\def\otfstepcharcommand#1#2#3% font char class
{\removeunwantedspaces
\hskip.5em plus .125em\relax
\doif{#3}{mark}{\underbar}{U+\hexnumber{#2}}:\ruledhbox{\ctxlua{nodes.tracers.fontchar(#1,#2)}}%
\hskip.5em plus .125em\relax}
\def\otfstepmessagecommand#1#2%
{\begingroup
\tttf\language\minusone
\veryraggedright
\forgetparindent
\forgeteverypar
\hangindent1em
\hangafter\plusone
\dontleavehmode\hbox{\detokenize{#1}}\removeunwantedspaces
\doifsomething{#2}{\break\detokenize{#2}}\endgraf
\endgroup
\blank}
\def\showotfstepchars#1%
{\ctxlua{nodes.tracers.steppers.codes(#1,"otfstepcharcommand")}}
\def\showotfstepmessages#1%
{\ctxlua{nodes.tracers.steppers.messages(#1,"otfstepmessagecommand",true)}}
\def\showotfstepfeatures
{\ctxlua{nodes.tracers.steppers.features()}}
\def\showotfsteps
{\begingroup
\veryraggedright
\forgetparindent
\forgeteverypar
\dontleavehmode\bgroup\tttf \language\minusone features: \showotfstepfeatures\egroup
\blank
\dontleavehmode\bgroup\tttf result:\egroup
\blank
\startlinecorrection
\ruledhbox\bgroup\box\otfcompositionbox\egroup
\stoplinecorrection
\dorecurse{\ctxlua{nodes.tracers.steppers.nofsteps()}}
{\blank
\showotfstepmessages\recurselevel
\blank
\startlinecorrection
\dontleavehmode\bgroup\resetallattributes\pardir TLT\textdir TLT\relax\tttf\recurselevel: \showotfstepchars\recurselevel\egroup
\stoplinecorrection
\blank
\startlinecorrection
\ruledhbox % can be mode
\bgroup\resetallattributes\showotfstepglyphs\recurselevel\egroup % reset is new, we don't want additional processing
\stoplinecorrection
\blank}%
\endgroup}
\unexpanded\def\startotfsample
{\enabletrackers[*otf.sample]% beware, kind of global
\startotfcollecting
\begingroup
\veryraggedright
\forgetparindent
\forgeteverypar}
\unexpanded\def\stopotfsample
{\endgroup
\stopotfcollecting
\disabletrackers[*otf.sample]% beware, kind of global: otf.sample
\showotfsteps
\resetotfcollecting}
\newbox\otfcompositionbox
\def\showotfcomposition#1#2#3% {font*features at size}, rl=-1, text
{\begingroup
\veryraggedright
\forgetparindent
\forgeteverypar
\setupcolors[\c!state=\v!start]% can be option
\startotfsample
\global\setbox\otfcompositionbox\hbox{\definedfont[#1]\ifnum#2<0 \textdir TRT\else\ifnum#2>0 \textdir TLT\fi\fi\relax#3}%
\stopotfsample
\endgroup}
\protect \endinput
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