Module:bnt-pro-sortkey

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local export = {}
local u = mw.ustring.char
local a, b = u(0xF000), u(0xF001)

local remove_diacritics = u(0x0300) .. u(0x0301) -- grave, acute

local oneChar = {
	["ɪ"] = "i" .. a, ["ì"] = "i" .. b, ["í"] = "i" .. b, ["ʊ"] = "u" .. a, ["ù"] = "u" .. b, ["ú"] = "u" .. b
}

function export.makeSortKey(text, lang, sc)
	return mw.ustring.upper(mw.ustring.toNFC(mw.ustring.gsub(mw.ustring.toNFD(mw.ustring.gsub(mw.ustring.lower(text), ".", oneChar)), "[" .. remove_diacritics .. "]", ""))) -- decompose, remove appropriate diacritics, then recompose again
end

return export