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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
\writestatus{loading}{ConTeXt Font Macros / Tracing}
%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\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
\unexpanded\def\doifelsefontpresent#1{\clf_doifelsefontpresent{#1}}
\let\doiffontpresentelse\doifelsefontpresent
% experimental, maybe this becomes a module
\newbox\otfcollector
\unexpanded\def\startotfcollecting{\ctxlua{nodes.tracers.steppers.start()}}
\unexpanded\def\stopotfcollecting {\ctxlua{nodes.tracers.steppers.stop()}}
\unexpanded\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
\unexpanded\def\showotfstepglyphs#1%
{\ctxlua{nodes.tracers.steppers.glyphs(\number\otfcollector,#1)}%
\unhbox\otfcollector}
\unexpanded\def\otfstepspace
{\removeunwantedspaces
\hskip.5\emwidth \s!plus .125\emwidth \s!minus .125\emwidth\relax}
\unexpanded\def\otfstepcharcommand#1#2#3% font char class
{\otfstepspace
\doif{#3}{mark}{\underbar}{U+\hexnumber{#2}}:\ruledhbox{\ctxlua{nodes.tracers.fontchar(#1,#2)}}%
\otfstepspace}
\unexpanded\def\otfstepfontcommand#1#2#3% id font size
{\begingroup
\tttf #1: #2 @ \the\dimexpr#3\scaledpoint\relax
\endgroup}
\unexpanded\def\otfstepmessagecommand#1#2%
{\begingroup
\tttf\language\minusone
\veryraggedright
\forgetparindent
\forgeteverypar
\hangindent\emwidth
\hangafter\plusone
\dontleavehmode\detokenize{#1}\removeunwantedspaces
\doifsomething{#2}{,\space\detokenize{#2}}\endgraf
\endgroup
\blank}
\unexpanded\def\showotfstepfont
{\ctxlua{nodes.tracers.steppers.font("otfstepfontcommand")}}
\unexpanded\def\showotfstepchars#1%
{\ctxlua{nodes.tracers.steppers.codes(#1,"otfstepcharcommand","otfstepspace")}}
\unexpanded\def\showotfstepmessages#1%
{\ctxlua{nodes.tracers.steppers.messages(#1,"otfstepmessagecommand",true)}}
\unexpanded\def\showotfstepfeatures
{\ctxlua{nodes.tracers.steppers.features()}}
\unexpanded\def\otfnoffeaturesteps
{\ctxlua{nodes.tracers.steppers.nofsteps()}}
% \unexpanded\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\otfnoffeaturesteps
% {\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\showotfsteps
{\begingroup
\veryraggedright
\forgetparindent
\forgeteverypar
\tt
\lefttoright
\hbox to \hsize \bgroup
\hbox to 6\emwidth{\bf font\hss}%
\vtop \bgroup
\hsize\dimexpr\hsize-6\emwidth\relax
\language\minusone
\bf
\showotfstepfont
\egroup
\egroup
\blank
\hbox to \hsize \bgroup
\hbox to 6\emwidth{\bf features\hss}%
\vtop \bgroup
\hsize\dimexpr\hsize-6\emwidth\relax
\language\minusone
\showotfstepfeatures
\egroup
\egroup
\blank
\scratchcounter\otfnoffeaturesteps\relax
\dorecurse\scratchcounter
{\blank
\begingroup
\advance\leftskip6\emwidth
\showotfstepmessages\recurselevel
\par
\endgroup
\blank
\dontleavehmode
\hbox to \hsize \bgroup
\hbox to 6\emwidth \bgroup
\bf
\ifnum\recurselevel=\scratchcounter result\else step \recurselevel\fi
\hss
\egroup
\vtop \bgroup
\hsize\dimexpr\hsize-6\emwidth\relax
\resetallattributes
\pardir TLT\textdir TLT\relax
\dontleavehmode
\ifnum\recurselevel=\scratchcounter
\ruledhbox{\box\otfcompositionbox}%
\else
\ruledhbox{\showotfstepglyphs\recurselevel}%
\fi
\quad
\showotfstepchars\recurselevel
\hfill
\par
\egroup
\egroup
\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
% this should go in spac-ali:
\installcorenamespace{otfcompositiondir}
\letvalue{\??otfcompositiondir -1}\righttoleft
\letvalue{\??otfcompositiondir r2l}\righttoleft
\letvalue{\??otfcompositiondir l2r}\lefttoright
\letvalue{\??otfcompositiondir +1}\lefttoright
\letvalue{\??otfcompositiondir 1}\lefttoright
\unexpanded\def\showotfcomposition#1#2#3% {font*features at size}, rl=-1, text
{\begingroup
\forgetparindent
\forgeteverypar
% \setupcolors[\c!state=\v!start]%
\setupalign[\v!verytolerant,\v!flushleft]%
\startotfsample
\nohyphens
\global\setbox\otfcompositionbox\hbox{\definedfont[#1]\relax\getvalue{\??otfcompositiondir#2}\relax#3}%
\stopotfsample
\endgroup}
\protect \endinput
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