Arabic with LuaTeX vs. XeTeX

[Otared Kavian <otared@gmail.com>]

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Dear all,

I just read the thread started by Burak Emir about "Typesetting Arabic  
today", and tried to typeset the sample sent by Idris Samawi Hamid.
One of the Arabic or Persian fonts that I have and LuaTeX can find is  
Nadeem (working on Mac OS X 10.5.3), but what I get after typesetting  
is the following attached PDF: all the characters are typeset with  
their isolated form. However typestting the same text with XeConTeXt  
or XeTeX gives a nice result.

So my question is, what should I add or subtract from the font  
features parameters to get a correct result?

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The source file is as follows:

% engine=luatex
\starttext

\definefontfeature
   [test]
   [analyze=yes,
   mode=node,
   language=dflt,
   script=arab,
   aalt=yes,
   init=yes,
   medi=yes,
   fina=yes,
   isol=yes,
   liga=yes,
   mset=yes]

\font\TradArabic = Nadeem*test    at 18pt

\startbuffer[paragraph]
الحمدلله حمد معترف بحمده، مغترف من  
بحار مجده، بلسان
الثناۤء شاكرا، ولحسن الاۤئه ناشرا؛  
الذي خلق الموت والحيوة، والخير
والشر، والنفع والضر، والسكون والحركة،  
والأرواح
والأجسام، والذكر والنسيان.

\blank

اَلْحَمْدُ لِلّٰهِ حَمْدَ مُعْتَرِفٍ  
بِحَمْدِهٖ، مُغْتَرِفٌ مِنْ بِحَارِ  
مَجْدِهٖ، بِلِسَانِ
الثَّنَاۤءِ شَاكِرًا، وَلِحُسْنِ  
اٰلاۤئِهٖ نَاشِرًا؛ اَلَّذِيْ خَلَقَ  
الْمَوْتَ وَالْحَيٰوةَ، وَالْخَيْرَ
وَالشَّرَّ، وَالنَّفْعَ وَالضَّرَّ،  
وَالسُّكُوْنَ وَالْحَرَكَةَ،  
وَالْأَرْوَاحَ
وَالْأَجْسَامَ، وَالذِّكْرَ  
وَالنِّسْيَانَ.

\stopbuffer

\start
\TradArabic
\pardir TRT \textdir TRT
\getbuffer[paragraph]
\stop

\stoptext 

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