Hi,tex.fontidentifier is supposed to return the csname of a font, but if \pdftracingsfonts=1, it will additionally include the fontname, which is not what I would expect:
\input luaotfload.sty
\font\x = "Latin Modern Roman" \x
\pdftracingfonts1
\directlua{texio.write_nl(tex.fontidentifier(font.current()))}
\bye
yields `\x ("Latin Modern Roman")' instead of `\x'.
(This is with luatex 0.80.)
Best,
--
Robert
