farm

function farmForward(distance, reversed)
    for _=1,distance do
        turtle.forward()
        if not reversed then
            turtle.turnLeft()
        else
            turtle.turnRight()
        end
        local success, data = turtle.inspect()
        if success then
            if data.name == "carrots" and data.state.age == 7 then
                turtle.dig()
                turtle.suck()
                turtle.place()
            end
        end
        if not reversed then
            turtle.turnRight()
        else
            turtle.turnLeft()
        end
    end
end


length = 11
width = 1
amount = 2
oneRun = 2*(amount*(5*length + 3*width + 2) - 2*length)

while turtle.getItemCount(1) > 0 do
    if turtle.getFuelLevel() < oneRun then
        turtle.select(1)
        turtle.refuel()
        turtle.select(2)
    end
    for passage=1,2 do
        reversed = passage == 2
        for line=1,amount do
            if line%2 == passage then
                farmForward(length, reversed)
                turtle.forward()
                turtle.turnLeft()
                farmForward(width, reversed)
            else
                farmForward(length, reversed)
                turtle.forward()
                turtle.turnRight()
                farmForward(width, reversed)
            end
        end
    end
end