[NTG-context] trying out "plug mode" and the harfbuzz plugin

I read the guitex article about ffi and luatex and wanted to try if I could run tests with harfbuzz and the plug-mode. Looking in the newest context I found in onandon-ffi.tex a reference to the module fonts-plugins. But this module loads a lua file which isn't in context: \registerctxluafile{font-phb}{} % harfbuzz plugin Is this an oversight or is the code not meant to be used? Or is there something newer somewhere else? -- Ulrike Fischer http://www.troubleshooting-tex.de/