You need to use the LuaHBTeX backend which isn't actually supported by ConTeXt (and Hans doesn't like it either, I think). There's a plugin mode, however. If not in the mailing list, more info about Harfbuzz in ConTeXt is available in some articles.

Regards,

Jairo

El vie., 18 de dic. de 2020 9:24 p. m., Robert Zydenbos <context@zydenbos.net> escribió:
Dear all,

Recently I read about the use of Harfbuzz-enhanced LuaTeX with LaTeX for writing Arabic. Following that example, I wrote a minimal test text that worked excellently for Kannada script as well:

-----
\documentclass{article}
\usepackage{fontspec}

\setmainfont{Kedage}[RawFeature={mode=harf;script=knda;}]

\begin{document}
ಇದು ಹೇಗಿದೆ? ನಾನು ಹೀಗೆ ತುಂಬ ಬರೆಯಬೇಕೆಂದು ಯೋಚಿಸುತ್ತಿದ್ದೇನೆ.
\end{document}
-----

I want to do this in ConTeXt too! Can anyone tell me how to translate “\setmainfont{Kedage}[RawFeature={mode=harf;script=knda;}]” into ConTeXt? This could be the key to using MkIV with Indic scripts.

Robert

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________