Turtle

local tunnelLength = 50
local length = 50

local currentTunnelLength = 0
local currentLength = 0

function refuel()
    for i=1,15,1 do
        turtle.select(i)
        if(turtle.getFuelLevel() < (length*3)+tunnelLength) then
            while (turtle.refuel(1) and turtle.getFuelLevel() < (length*3)+tunnelLength) do
            end
        end
    end
end
function foundEmptySlots()
    foundEmpty = 0
    for i=1,15,1 do
        if(turtle.getItemCount(i) == 0) then
            foundEmpty = foundEmpty + 1
        end
    end
    if(turtle.getItemCount(16) == 0) then
        foundEmpty = -1
    end
    return foundEmpty
end

function mine()
    while(currentTunnelLength < tunnelLength) do
        refuel()
        if(currentTunnelLength%3==0) then
            turtle.turnLeft()
            while(currentLength < length) do
                turtle.dig()
                moveForward()
                turtle.digUp()
                currentLength = currentLength+1
            end
            turtle.turnLeft()
            turtle.turnLeft()
            while(currentLength > 0) do
                moveForward()
                if(currentLength%8==0) then
                    turtle.select(16)
                    turtle.placeUp()
                    turtle.select(1)
                end
                currentLength = currentLength-1
            end
            while(currentLength < length) do
                turtle.dig()
                moveForward()
                turtle.digUp()
                currentLength = currentLength+1
            end
            turtle.turnLeft()
            turtle.turnLeft()
            while(currentLength > 0) do
                moveForward()
                if(currentLength%8==0) then
                    turtle.select(16)
                    turtle.placeUp()
                    turtle.select(1)
                end
                currentLength = currentLength-1
            end
            turtle.turnRight()
            empties = foundEmptySlots()
            if(empties < 3 or empties == -1) then
                turtle.turnLeft()
                turtle.turnLeft()
                for i=1,currentTunnelLength,1 do
                    moveForward()
                end
                for i=1,15,1 do
                    turtle.select(i)
                    turtle.drop()
                end
                while(foundEmptySlots() == -1) do
                    print("Waiting for Torches: ")
                end
                turtle.turnLeft()
                turtle.turnLeft()
                for i=1,currentTunnelLength,1 do
                    moveForward()
                end
            end
        end

        turtle.dig()
        moveForward()
        turtle.digUp()
        currentTunnelLength = currentTunnelLength + 1

    end
    turtle.turnLeft()
    turtle.turnLeft()
    while(currentTunnelLength > 0) do
        moveForward()
        currentTunnelLength = currentTunnelLength - 1
    end
end

function moveForward()
    while not turtle.forward() do turtle.attack() end
end
function moveDown()
    while not turtle.down() do turtle.attackDown() end
end

print("TunnelLength:")
tunnelLength = tonumber(read())
print("Length:")
length = tonumber(read())
mine()