minetest.register_chatcommand("mapfix", {
	params = "<size>",
	description = "Recalculate the flowing liquids of a chunk",
	func = function(name, param)
		local pos = minetest.get_player_by_name(name):getpos()
		local size = tonumber(param) or 40
		if size > 50 and not minetest.check_player_privs(name, {server=true}) then
			return false, "You need the server privilege to exceed the radius of 50 blocks"
		end
		local minp, maxp = {x = math.floor(pos.x - size), y = math.floor(pos.y - size), z = math.floor(pos.z - size)}, {x = math.ceil(pos.x + size), y = math.ceil(pos.y + size), z = math.ceil(pos.z + size)}
		local vm = minetest.get_voxel_manip()
		vm:read_from_map(minp, maxp)
		vm:calc_lighting()
		vm:update_liquids()
		vm:write_to_map()
		vm:update_map()
		return true, "Done."
	end,
})