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diff --git a/tex/context/base/s-fonts-coverage.lua b/tex/context/base/s-fonts-coverage.lua
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+++ b/tex/context/base/s-fonts-coverage.lua
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+if not modules then modules = { } end modules ['s-fonts-coverage'] = {
+ version = 1.001,
+ comment = "companion to s-fonts-coverage.mkiv",
+ author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+ copyright = "PRAGMA ADE / ConTeXt Development Team",
+ license = "see context related readme files"
+}
+
+moduledata.fonts = moduledata.fonts or { }
+moduledata.fonts.coverage = moduledata.fonts.coverage or { }
+
+local upper, format = string.upper, string.format
+local lpegmatch = lpeg.match
+local concat = table.concat
+
+local context = context
+local NC, NR, HL = context.NC, context.NR, context.HL
+local char, bold, getvalue = context.char, context.bold, context.getvalue
+
+local chardata = characters.data
+
+function moduledata.fonts.coverage.showcomparison(specification)
+
+ specification = interfaces.checkedspecification(specification)
+
+ local fontfiles = utilities.parsers.settings_to_array(specification.list or "")
+ local pattern = upper(specification.pattern or "")
+
+ local present = { }
+ local names = { }
+ local files = { }
+
+ if not pattern then
+ -- skip
+ elseif pattern == "" then
+ pattern = nil
+ elseif tonumber(pattern) then
+ pattern = tonumber(pattern)
+ else
+ pattern = lpeg.oneof(utilities.parsers.settings_to_array(pattern))
+ pattern = (1-pattern)^0 * pattern
+ end
+
+ 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,
+ }
+ if id and fontdata then
+ for k, v in next, fontdata.characters do
+ present[k] = true
+ end
+ names[#names+1] = fontname
+ files[#files+1] = fontfile
+ end
+ end
+
+ local t = { }
+
+ context.starttabulate { "|Tr" .. string.rep("|l",#names) .. "|" }
+ for i=1,#files do
+ local file = files[i]
+ t[#t+1] = i .. "=" .. file
+ NC()
+ context(i)
+ NC()
+ context(file)
+ NC()
+ NR()
+ end
+ context.stoptabulate()
+
+ context.setupfootertexts {
+ table.concat(t," ")
+ }
+
+ context.starttabulate { "|Tl" .. string.rep("|c",#names) .. "|Tl|" }
+ NC()
+ bold("unicode")
+ NC()
+ for i=1,#names do
+ bold(i)
+ NC()
+ end
+ bold("description")
+ NC()
+ NR()
+ HL()
+ for k, v in table.sortedpairs(present) do
+ if k > 0 then
+ local description = chardata[k].description
+ if not pattern or (pattern == k) or (description and lpegmatch(pattern,description)) then
+ NC()
+ context("%05X",k)
+ NC()
+ for i=1,#names do
+ getvalue(names[i])
+ char(k)
+ NC()
+ end
+ context(description)
+ NC()
+ NR()
+ end
+ end
+ end
+ context.stoptabulate()
+
+end