tunnel.lua

print("How Far would you like to go?")
local length = tonumber(read())
term.clear()
print("dig 3 block high?")
print("Type yes or no")
local answer = read()
local height = 2
if answer == "yes" then
    height = 3
end
term.clear()
local distance = 0

function empty()
    turtle.turnLeft()
    turtle.turnLeft()
    for i = 1,distance do
        turtle.forward()
    end
    for i = 2,16 do
        turtle.select(i)
        turtle.drop()
    end
    turtle.turnLeft()
    turtle.turnLeft()
    for i = 1,distance do
        turtle.forward()
    end
end
function mine()
    while distance < length do
        turtle.dig()
        turtle.forward()
        if height == 3 then
            turtle.digDown()
        end
        turtle.digUp()
        distance = distance +1
        check()
    end
end
function check()
    turtle.select(1)
    local number = turtle.getItemCount() -1
    if number > 0 then
        turtle.dropDown(number)
    end
    turtle.select(16)
    if turtle.getItemCount() >=1 then
        empty()
    end
    turtle.select(1)
end

mine()
function done()
    turtle.turnLeft()
    turtle.turnLeft()
    for i = 1,distance do
        turtle.forward()
    end
    if turtle.detect() then
        for i = 1,16 do
            turtle.select(i)
            turtle.drop()
        end
    end
    turtle.turnLeft()
    turtle.turnLeft()
end
done()