cartographer/autofill.lua

local chunk, scanner, maps = ...;

-- Periodically-called function to fill in maps and queue chunks for manual
-- scanning
local function fill_loop()
    -- Fill in all player-held maps
    for _,p in ipairs(minetest.get_connected_players()) do
        local inventory = p:get_inventory();
        local pos = p:get_pos();
        if pos.y > -10 then
            for i = 1,inventory:get_size("main") do
                local stack = inventory:get_stack("main", i);
                local map = maps.get(stack:get_meta():get_int("cartographer:map_id"));

                if map then
                    map:fill_local(pos.x, pos.z);
                end
            end
            for i = -2,2 do
                for j = -2,2 do
                    local adjusted_pos = {
                        x = pos.x + chunk.from(i),
                        y = pos.y,
                        z = pos.z + chunk.from(j),
                    }
                    scanner.queue_region(adjusted_pos);
                end
            end
        end
    end

    for _ = 1,10 do
        scanner.scan_regions();
    end
    minetest.after(5, fill_loop);
end
minetest.after(5, fill_loop);