local function fn(config, deck, deckfname)
    local mcl = {}
    for i, card in ipairs(deck) do
        for path in card.note:gmatch(IMG_PATTERN) do
            local fh = io.open((deckfname:match(".*/") or "") .. path, "r")
            if not fh then
                table.insert(mcl, i)
                break
            end
        end
    end
    if #mcl >= 1 then
        io.write(string.format("Found %d card%s with bad image references:\n", #mcl, #mcl == 1 and "" or "s"))
    else
        io.write(string.format("No cards with bad image references\n"))
    end
    for _, i in ipairs(mcl) do
        io.write(string.format("%d %s\n", i, deck[i].note))
    end
end

return { desc = "(i)mage reference check", nd = true, fn = fn }