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+%D \module
+%D [ file=s-fonts-steps, % was s-fnt-20
+%D version=2009.01.10,
+%D title=\CONTEXT\ Style File,
+%D subtitle=Tracing Feature Application (1),
+%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.
+
+%D This file is used by Idris and me in the process of getting the
+%D best arabic fonts getting rendered best. As such it might change.
+
+\startmodule[fonts-steps]
+
+% \setvariables
+% [otftracker]
+% [title=Reverse Chaining,
+% figure=test-003-volt.pdf,
+% font=husayni,
+% sample={ببب بببب ببببب بببببب}]
+
+\def\checkedotftrackerfeature #1{otftracker-\ifnum\featureattribute{otftracker-#1}=\zerocount default\else#1\fi}
+\def\checkedotftrackerdirection#1{\csname otftracker-direction-\ifcsname otftracker-direction-#1\endcsname#1\else default\fi\endcsname}
+
+% we can consider adding a dir key to features
+
+\definefontfeature
+ [otftracker-default]
+ [default]
+ [mode=node]
+
+\definefontfeature
+ [otftracker-arabtype]
+ [mode=node,analyze=yes,
+ language=dflt,script=arab,ccmp=yes,
+ init=yes,medi=yes,fina=yes,isol=yes,
+ liga=yes,dlig=yes,rlig=yes,clig=yes,
+ mark=yes,mkmk=yes,kern=yes,curs=yes]
+
+\definefontfeature
+ [otftracker-husayni-default]
+ [analyze=yes,mode=node,
+ language=dflt,script=arab,
+ init=yes,medi=yes,fina=yes,
+ spacekern=yes,
+ calt=yes,
+ rlig=yes,
+ ccmp=yes,
+ salt=yes,
+ ss01=yes, % full Allah, Muhammad, Allahumma
+ ss05=yes, % full Jiim stacking
+ ss09=yes, % full Haa stacking
+ ss10=yes, % partial dipped Miim
+ ss13=yes, % full stacked Miim
+ ss15=yes, % full stacked Laam-on-Miim
+ ss17=yes, % full stacked Ayn-on-Miim
+ ss19=yes, % LM_im
+ ss24=yes, % BX specials
+ ss25=yes, % LH_im specials
+ ss26=yes, % full Yaa.final specials
+ ss27=yes, % partial thin Miim.final
+ ss31=yes, % partial Raa.final contexts
+ ss34=yes, % partial Raa.final contexts
+ ss35=yes, % full Kaaf contexts
+ ss36=yes, % full Laam contexts
+ ss37=yes, % Miim-Miim contexts
+ ss38=yes, % fancy thin Haa.medial-Miim.final
+ ss39=yes, % high and low Baa strings
+ ss40=yes, % diagonal entry
+ ss41=yes, % initial alternates
+ mark=yes,mkmk=yes,kern=yes,curs=yes]
+
+\definefontfeature
+ [otftracker-husayni]
+ [otftracker-husayni-default]
+
+\definefontfeature
+ [otftracker-simplenaskhi]
+ [analyze=yes,mode=node,
+ language=dflt,script=arab,
+ init=yes,medi=yes,fina=yes,calt=yes,
+ rlig=yes,liga=yes,dlig=yes,
+ mark=yes,mkmk=yes,kern=yes,curs=yes]
+
+\setvalue{otftracker-direction-arabtype}{r2l}
+\setvalue{otftracker-direction-husayni}{r2l}
+\setvalue{otftracker-direction-simplenaskhi}{r2l}
+\setvalue{otftracker-direction-default}{}
+\setvalue{otftracker-direction-sbl-hbrw}{r2l}
+
+\setvariables
+ [otftracker]
+ [font=Serif,
+ features=\checkedotftrackerfeature{\getvariable{otftracker}{font}},
+ direction=\checkedotftrackerdirection{\getvariable{otftracker}{font}},
+ size=48pt,
+ figure=,
+ title=Feature Check,
+ sample=no sample,
+ set=\setups{otftracker}]
+
+\setuplayout
+ [topspace=1.5cm,
+ backspace=1.5cm,
+ width=middle,
+ height=middle,
+ header=1.5cm,
+ footer=1.5cm]
+
+\setuphead
+ [chapter]
+ [header=high,
+ number=no]
+
+\setupfootertexts
+ [chapter]
+
+\setupalign
+ [flushleft]
+
+\setupcolors
+ [state=start]
+
+\startsetups otftracker-steps
+ \doifsomething {\getvariable{otftracker}{figure}} {
+ \startlinecorrection
+ \externalfigure[\getvariable{otftracker}{figure}][maxwidth=\hsize,frame=on]
+ \stoplinecorrection
+ }
+ \showotfcomposition
+ {\getvariable{otftracker}{font}*\getvariable{otftracker}{features} at \getvariable{otftracker}{size}}
+ {\getvariable{otftracker}{direction}}
+ {\getvariable{otftracker}{sample}}
+\stopsetups
+
+\startsetups otftracker
+ \setupbodyfont[tt,10pt]
+ \starttext
+ \normalexpanded{\startchapter[title={\getvariable{otftracker}{title}}]}
+ \directsetup{otftracker-steps}
+ \directsetup{otftracker-extra}
+ \stopchapter
+ \setvariables[otftracker][comment=]
+ \stoptext
+\stopsetups
+
+%D For old times sake we keep this one:
+
+\unexpanded\def\ShowOtfTrackerSample#1%
+ {\doiffile{#1}
+ {\blank
+ \startlinecorrection
+ \vbox \bgroup
+ \forgetall
+ \setbox\scratchbox\hbox{\component #1 \relax}
+ \hbox{\copy\scratchbox\quad\lower\dp\scratchbox\hbox{\ruledhbox{\externalfigure[#1-volt.pdf][height=\htdp\scratchbox]}}}
+ \hbox{\strut\tttf#1}%
+ \egroup
+ \stoplinecorrection
+ \blank}}
+
+\stopmodule
+
+\continueifinputfile{s-fonts-steps.mkiv}
+
+\usemodule[art-01]
+
+\setupbodyfont
+% [cambria]
+ [dejavu]
+
+\starttext
+
+\setvariables
+ [otftracker]
+ [font=Serif,
+ size=48pt,
+ figure=,
+ title=Feature Check,
+ sample={affiliation}]
+
+\stoptext