DWriteShapePy doesn't seem to analyse RTL texts correctly:
PS C:\Users\simon\Desktop> python3 -m dwriteshapepy --language ar .\NNUTest.ttf -u 06cc,0679,06d2
[alefMaksura-ar.fina.alt=0+504.0|[email protected],-389.0+0.0|[email protected],375.0+204.0|nobari=0+0.0|yehbarree-ar.isol=0+1409.0]
The text should be the other way around. (06cc FARSI YEH should be in initial position, 0x6d2 YEH BARREE should be in final position)