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%#!lualatex
\documentclass{article}
\batchmode
\usepackage{luaotfload,booktabs,array,luacode,longtable}
\usepackage[scale=0.8]{geometry}
\errorstopmode

\ifdefined\myfontname\else
{\newlinechar=`@
\message{@Name of the font to test = }
\read-1 to\myfontname \global\let\myfontname\myfontname
\message{@}}
\fi
\font\test=\myfontname\space at 12pt
{\test\begin{luacode}
  ident = fonts.hashes.identifiers[font.current()]
\end{luacode}
}


\def\FMT#1#2{{\oalign{\test\char#1\crcr\rm\tiny\hss#2\hss\crcr}}}
\def\OUT#1{\leavevmode\hbox to 7em{{\test\char"#1}\ ({\tt U+#1})\hss}}%"
\begin{document}
{\noindent\Large\bf \myfontname\\\null\hfill (%
  \directlua{tex.sprint(ident.fullname)}%
)}

\bigskip
\baselineskip18pt

\begin{luacode}
local fl = fontloader.open(ident.filename)
local ft = fontloader.to_table(fl)

local ivs, ivsi = {}, {}
local uniq_flag
local function add_ivs_table(tg)
   for gu, gv in pairs(tg) do
      local ga = gv.altuni
      if ga then
	 for _,at in pairs(ga) do
	    local bu, vs = at.unicode, (at.variant or 0)-0xE0100
	    if vs>=0 and vs<0xF0 then
	       if not ivs[bu] then ivs[bu] = {}; ivsi[1+#ivsi]=bu end
	       uniq_flag = true
               for _,v in pairs(ivs[bu]) do
                  if v[1]==vs then uniq_flag = false; break end
               end
	       if uniq_flag then ivs[bu][1+#(ivs[bu])] = { vs, gv.name } end
	    end
	 end
      end
   end
end

add_ivs_table(ft.glyphs)
if ft.subfonts then
   for _,v in pairs(ft.subfonts) do
      add_ivs_table(v.glyphs)
   end
end
fontloader.close(fl)

local unicodes = ident.resources.unicodes
local sort = table.sort
local sortfn = function (a,b) return a[1]<b[1] end
sort(ivsi)
for _,v in pairs(ivsi) do 
   sort(ivs[v], sortfn) 
   tex.sprint('\\OUT{' .. string.format('%X', v) .. '}\\ ')
   for _, cn in pairs(ivs[v]) do
     tex.sprint('\\FMT{' .. tostring(unicodes[cn[2]]) .. '}{' .. cn[1] .. '}' )
   end
   tex.sprint('\\par')
end


\end{luacode}


\end{document}