коробочка

SIZE = 7;

function refuelIfNeeded()
    local fuel = turtle.getFuelLevel();
    if fuel<160 then
        local prev_slot = turtle.getSelectedSlot();
        turtle.select(16);
        turtle.refuel(math.ceil(fuel/80));
        turtle.select(prev_slot);
    end

end

function checkFindSlot(item_name)
    if  turtle.getItemCount()==0 or turtle.getItemDetail().name ~= item_name then
        for i=1,16,1 do
            turtle.select(i);
            if  turtle.getItemCount()~=0 and turtle.getItemDetail().name == item_name then
                return true;
            end

        end
        error("no blocks found");
    end

end

function checkedPlace(item_name)
    checkFindSlot(item_name);
    turtle.placeDown();
end

function checkedForward()
    refuelIfNeeded();
    if turtle.getFuelLevel()==0 then error("failed to refuel") end
    turtle.forward();
end

function checkedUp()
    refuelIfNeeded();
    if turtle.getFuelLevel()==0 then error("failed to refuel") end
    turtle.up();
end

function checkedDown()
    refuelIfNeeded();
    if turtle.getFuelLevel()==0 then error("failed to refuel") end
    turtle.down();
end

function drawLine(n)

    for i = 1,n-1,1 do

        checkedPlace(BLOCK);

        checkedForward();
    end

    checkedPlace(BLOCK);
end

function drawSquare(size)

    for row_number = 1,size,1 do
        drawLine(size);

        if row_number==size then break; end

        if row_number%2==1 then
            turtle.turnRight();
            checkedForward();
            turtle.turnRight();
        else
            turtle.turnLeft();
            checkedForward();
            turtle.turnLeft();
        end
    end

end

function drawPerimeter(size)

    for i = 1,4,1 do
        drawLine(size);
        turtle.turnRight();
    end

end

turtle.select(1);


BLOCK = turtle.getItemDetail().name;

print(BLOCK);


drawSquare(SIZE);

if SIZE%2==1 then
    turtle.turnLeft();
    turtle.turnLeft();
else
    turtle.turnRight();
end

checkedUp();

for i=1,3,1 do
    drawPerimeter(SIZE);
    checkedUp();
end

drawSquare(SIZE);

checkedForward();

for i=1,1+3+1,1 do
    checkedDown();
end