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I tried to write Arabic in plain Luatex but all letters in isolted mode

\input luaotfload.sty
\font\amiri={file:amiri-regular.ttf:mode=harf;script=arabic} at 12pt
\pagedir TRT \bodydir TRT \textdir TRT \pardir TRT
\amiri
 بسم الله الرحمن الرحيم

\bye
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    You need luahbtex for mode =harf. Did you use it?
    – Ulrike Fischer
    Commented Oct 7, 2021 at 5:57
  • @UlrikeFischer no I thinked there is no differ between luatex ver 1.14 and luahbtex. but as you told I was wrong. After compiling with lauhbtex it is OK.
    – hubaishan
    Commented Oct 7, 2021 at 6:07

1 Answer 1

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For mode=harf (Harfbuzz) you need as engine luahbtex. So your log should start like this:

This is LuaHBTeX, Version 1.13.2 (TeX Live 2021/W32TeX) ...

In texlive you get it with calling luahbtex

Then your example will give this:

enter image description here

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