Sugar Cane Farm

function forward(number)
    for i = 1, number do
        while not turtle.forward() do
            turtle.dig()
            turtle.attack()
        end
    end
end

function backward(number)
    for i = 1, number do
        while not turtle.back() do
            turtle.dig()
            turtle.attack()
        end
    end
end

function moveUp(number)
    for i = 1, number do
        while not turtle.up() do
            turtle.digUp()
            turtle.attackUp()
        end
    end
end

function moveDown(number)
    for i = 1, number do
        while not turtle.down() do
            turtle.digDown()
            turtle.attackDown()
        end
    end
end

function checkSugarCane(length, width)
    moveUp(2)
    forward(1)
    for i = 1, width / 2 do
        for j = 1, length do
            forward(1)
            turtle.digDown()
        end
        forward(1)
        turtle.turnRight()
        forward(2)
        turtle.turnLeft()
        for j = 1, length do
            backward(1)
            turtle.digDown()
        end
        backward(1)
        turtle.turnRight()
        forward(2)
        turtle.turnLeft()
    end
    turtle.turnLeft()
    forward(width * 2)
    turtle.turnRight()
    backward(1)
    moveDown(2)
    for i = 1, 16 do
        turtle.select(i)
        turtle.dropDown()
    end
    turtle.select(1)
end

function main()
    checkSugarCane(6, 4)
end

while true do
    main()
    sleep(120)
end