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\startluacode

local format, upper, find = string.format, string.upper, string.find
local chardata = characters.data

function fonts.tracers.coverage(fontfiles,pattern) -- todo: patterns

    local present, names = { }, { }
    local pattern = pattern and upper(pattern)

    for i=1,#fontfiles do
        local fontname = format("testfont-%s",i)
        local fontfile = fontfiles[i]
        local fontsize = tex.dimen.bodyfontsize
        local id, fontdata = fonts.definers.define {
            name = fontfile,
            size = fontsize,
            cs   = fontname,
        }
        for k, v in next, fontdata.characters do
            present[k] = true
        end
        names[i] = fontname
    end

    context.starttabulate {"|Tr" .. string.rep("|l",#names) .. "|" }
        for i=1,#names do
            context.NC()
            context(i)
            context.NC()
         -- context.getvalue(names[i])
            context.type(fontfiles[i])
            context.NC()
            context.NR()
        end
    context.stoptabulate()

    context.starttabulate {"|Tl" .. string.rep("|c",#names) .. "|Tl|" }
        context.NC()
        context.type("unicode")
        context.NC()
        for i=1,#names do
            context.type(i)
            context.NC()
        end
        context.type("description")
        context.NC()
        context.NR()
        context.HL()
        for k, v in table.sortedpairs(present) do
            local description = chardata[k].description
            if not pattern or (pattern == k) or (description and find(description,pattern)) then
                context.NC()
                context(format("%05X",k))
                context.NC()
                for i=1,#names do
                    context.getvalue(names[i])
                    context.char(k)
                    context.NC()
                end
                context(description)
                context.NC()
                context.NR()
            end
        end
    context.stoptabulate()

end

\stopluacode

\doifnotmode{demo}{\endinput}

\setupbodyfont[10pt]

\setuplayout
  [backspace=1cm,
   topspace=1cm,
   footer=1cm,
   header=0cm,
   height=middle,
   width=middle]

\starttext

% \startluacode
%     fonts.tracers.coverage {
%         "pirat.ttf",
%     }
% \stopluacode

% \startluacode
%     fonts.tracers.coverage {
%      -- "cambria.ttf",
%         "lbr.afm",
%         "LucidaBrightRegular.ttf",
%         "lbi.afm",
%         "LucidaBrightItalic.ttf",
%         "lbd.afm",
%         "LucidaBrightDemiBold.ttf",
%         "lbdi.afm",
%         "LucidaBrightDemiItalic.ttf",
%     }
% \stopluacode

% \startluacode
%     fonts.tracers.coverage ( {
%         "LucidaBrightRegular.ttf",
%         "cambria.ttf",
%         "iwona-regular.otf",
%         "texgyrepagella-regular.otf",
%         "texgyretermes-regular.otf",
%         "texgyrebonum-regular.otf",
%         "antpolt-regular.otf",
%     }, "OGONEK")
% \stopluacode

% \loadfontgoodies[lucida-math]
% \loadfontgoodies[lm-math]

% \startluacode
%     fonts.tracers.coverage {
%         "LucidaBrightRegular.ttf",
%         "LucidaBrightOne@lucida-math",
%         "cambria.ttc(Cambria Math)",
%         "xits-math.otf",
%         "LMMath10-Regular@lmroman10-math",
%     }
% \stopluacode

\loadfontgoodies[px-math]
\loadfontgoodies[lm-math]

\startluacode
    fonts.tracers.coverage {
        "cambria.ttc(Cambria Math)",
        "xits-math.otf",
        "LMMath10-Regular@lmroman10-math",
        "pxmath@px-math",
        "LinLibertine_Re-4.7.5.otf",
    }
\stopluacode

\stoptext