Currently 'font-ota.lua' hard codes the Arabic shaping properties,and it doesn't seem to be complete (e.g. the ڤ as in أڤاست is not joined), I think such information belong to 'char-def.lua' and should be derived from UCD, which provide 'ArabicShaping.txt[1]', covering Arabic, Syriac and N'Ko scripts which all need the same shaping as Arabic.
[1]http://unicode.org/Public/5.1.0/ucd/ArabicShaping.txt Regards, Khaled -- Khaled Hosny Arabic localiser and member of Arabeyes.org team Free font developer
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