Minecraft Turtle Miner v1.03

tArgs = {...}

local torchSlot = 15
local fuelSlot = 16
local torchCompareSlot = 14
local torchCounter = 0
local torchPlacePoint = 7
local currentLevel = 0

function refuel(fuelAmount)
 if fuelAmount == nil then fuelAmount = 1 end
 turtle.select(fuelSlot)
 if turtle.refuel(fuelAmount) == true then
   turtle.select(1)
   return true
 else
   turtle.select(1)
   return false
 end
end

function getFuel()
  return turtle.getFuelLevel()
end

function turnRight(revolutions)
  if revolutions == nil then revolutions = 1 end
  for i =1, revolutions do
    turtle.turnRight()
  end
end

function turnLeft(revolutions)
  if revolutions == nil then revolutions = 1 end
  for i = 1, revolutions do
    turtle.turnLeft()
  end
end

function digLayer()
 dig()
 goForward(1)
 digUp(2)
 turnRight()
 dig()
 turnLeft()
 digDown(2)
 turnLeft()
 goForward(2)
 dig()
 goForward(1)
 turnRight()
 digUp(2)
 turnRight()
 goForward(1)
 turnLeft()
 goDown(2)
end

function goUp(distance)
  if distance == nil then distance = 1 end
  for i = 1, distance do
    turtle.up()
    currentLevel = currentLevel + 1
  end
end

function goDown(distance)
  if distance == nil then distance = 1 end
  for i = 1, distance do
    turtle.down()
    currentLevel = currentLevel - 1
  end
end

function goForward(distance)
  if distance == nil then distance = 1 end
  for i = 1, distance do
    turtle.forward()
  end
end

function goBack(distance)
  if distance == nil then distance = 1 end
  for i = 1, distance do
    turtle.back()
  end
end

function turnAround()
  turnRight(2)
end

function digUp(distance)
  if distance == nil then distance = 1 end
  for i = 1, distance do
    while turtle.detectUp() == true do
      turtle.digUp()
    end
    if distance > 1 then
      goUp()
    end
  end
end

function dig(distance)
  if distance == nil then distance = 1 end
  for i = 1, distance do
    while turtle.detect() == true do
      turtle.dig()
    end
  end
end

function digDown(distance)
  if distance == nil then distance = 1 end
  for i = 1, distance do
    turtle.digDown()
    if distance > 1 then
      goDown()
    end
  end
end

function goToFloor()
  if currentLevel > 0 then
    while turtle.detectDown == false do
      goDown()
      if currentLevel == 0 then
         print("Possibly over a chasm. Breaking")
         return false
      end
    end
  end
  return true
end

function placeTorch()
  turtle.select(torchSlot)
  if turtle.compareTo(torchCompareSlot) == true then
    if turtle.detectDown() == true then
      turnAround()
      goForward(1)
      if turtle.detectDown() == true then
        goBack(1)
        turtle.placeDown()
        turnAround()
      end
    else
      if goToFloor() == true then
        turnAround()
        goForward(1)
        if turtle.detectDown() == true then
          goBack(1)
          turtle.placeDown()
          turnAround()
        end
      end
    end
  else
    print("Out of torches!")
  end
end

function checkTorchPlacement()
  torchCounter = torchCounter + 1
  if torchCounter == torchPlacePoint then
    placeTorch()
    torchCounter = 0
  end
end

if tArgs[1] == nil then
  print("Usage: miner <length of shaft")
else
  shaftLength = tonumber(tArgs[1])
  for i = 1, shaftLength do
   print("Working on layer "..i)
   digLayer()
   checkTorchPlacement()
  end
  print("Job Done!")
end