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+%D \module
+%D [ file=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 / Hans Hagen \& Ton Otten}]
+%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.
+
+% \setvariables
+% [otftracker]
+% [title=Reverse Chaining,
+% figure=test-003-volt.pdf,
+% font=husayni,
+% sample={ببب بببب ببببب بببببب}]
+
+\def\checkedfeature#1#2{\ifnum\featureattribute{#1}=\zerocount#2\else#1\fi}
+
+% 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]
+% [analyze=yes,mode=node,
+% language=dflt,script=arab,ccmp=yes,
+% init=yes,medi=yes,fina=yes,isol=yes,
+% calt=yes,
+% mark=yes,mkmk=yes,kern=yes,curs=yes]
+
+\definefontfeature
+ [otftracker-husayni]
+ [analyze=yes,mode=node,
+ language=dflt,script=arab,ccmp=no,
+ init=yes,medi=yes,fina=yes,
+ rlig=yes,
+ ccmp=yes,
+ ss01=yes, % full Allah, Muhammad, Allahumma
+ ss05=yes, % full Jiim stacking
+ ss09=yes, % full Haa stacking
+ ss10=yes, % partial dipped Miim
+ % ss11=yes, % full 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,ss25=yes,ss26=yes, % BX, LH_im, 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
+ % js06=yes,js08=yes,js10=yes,js11=yes,js17=yes,
+ % ttwl=yes,
+ mark=yes,mkmk=yes,
+ kern=yes,curs=yes]
+
+\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,curs=yes]
+
+\setvalue{otftracker-direction-arabtype}{-1}
+\setvalue{otftracker-direction-husayni}{-1}
+\setvalue{otftracker-direction-simplenaskhi}{-1}
+
+\setvariables
+ [otftracker]
+ [font=Serif,
+ features=\checkedfeature{otftracker-\getvariable{otftracker}{font}}{otftracker-default},
+ size=48pt,
+ figure=,
+ title=Feature Check,
+ sample=no sample,
+ direction=\executeifdefined{otftracker-direction-\getvariable{otftracker}{font}}{0},
+ 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
+ \setupbodyfont[tt,10pt]
+ \starttext
+ \chapter{\getvariable{otftracker}{title}}
+ \doifsomething {\getvariable{otftracker}{figure}} {
+ \startlinecorrection
+ \externalfigure[\getvariable{otftracker}{figure}]
+ \stoplinecorrection
+ }
+ \showotfcomposition
+ {\getvariable{otftracker}{font}*\getvariable{otftracker}{features} at \getvariable{otftracker}{size}}
+ {\getvariable{otftracker}{direction}}
+ {\getvariable{otftracker}{sample}}
+ \stoptext
+\stopsetups