-- Original Code by Hmann53
-- Modifications by Gregulator
-- Strip mines a 2x1 hole of a lenghth of your choice, then it comes back 3 blocks to the right and mines its way back. After depositing the inventory, the process is repeated 3 more times.

-- Slot 1 : torches
-- Slot 2 : fuel
-- Slot 3 : Cobble
-- Slot 4 : Chests
-- Slots 5-16 : open
--variables

x = 0
z = 0
y = 0
--functions

local function refuel()

if turtle.getFuelLevel() < 40 then
turtle.select(2)
turtle.refuel(1)
end
end

local function mining()
refuel()
if not turtle.detectDown() then
turtle.select(3)
turtle.placeDown()
end
turtle.dig()
local f = turtle.forward()
if f then
x = x + 1
end
turtle.digUp()
sleep(0.2)
end

local function torch()
z = z + 1
if z == 10 then
turtle.turnRight()
turtle.turnRight()
turtle.select(1)
turtle.place()
turtle.turnLeft()
turtle.turnLeft()
z = 0
end
end

local function empty()
write("Empty inventory")
turtle.dig()
turtle.select(4)
turtle.place()
turtle.select(5)
turtle.drop()
turtle.select(6)
turtle.drop()
turtle.select(7)
turtle.drop()
turtle.select(8)
turtle.drop()
turtle.select(9)
turtle.drop()
turtle.select(10)
turtle.drop()
turtle.select(11)
turtle.drop()
turtle.select(12)
turtle.drop()
turtle.select(13)
turtle.drop()
turtle.select(14)
turtle.drop()
turtle.select(15)
turtle.drop()
turtle.select(16)
turtle.drop()
end

--code

write("How far do you want to dig? ")
distance = io.read()
distance = tonumber(distance)
write("Starting to mine...")

while y < 4 do
x = 0
while x < distance do
mining()
torch()
end

turtle.turnRight()
mining()
mining()
mining()
turtle.turnRight()

x = 0
while x < distance do
mining()
torch()
end


empty()
turtle.turnLeft()
mining()
mining()
mining()
turtle.turnLeft()

y = y + 1
end

write("Mission Complete!")