Flatten

-- Flatten Turtle Program
os.loadAPI("t")
local args = {...}
local versionNumber = "1.5"
local programName = "StarDustFlattener "
local digWidth = 0
local digLength = 0
local currentLine = 0
local lastLine = false

term.clear()
term.setCursorPos(1,1)
print(programName..versionNumber.." Coded by MrHG")
print("")
print("Slot 1: Fuel")
print("Slot 2: Materials")

if #args == 1 then
 digLength = args[1]
 digWidth = args[1]
elseif #args == 2 then
 digLength = args[1]
 digWidth = args[2]
else
 print ("Usage: Flatten (Length) [Width]")
 return
end

function digUpUntilEmpty()
 local emptyBlocks = 0
 local blocksFromFloor = 0
 while emptyBlocks < 2 do
  t.up()
  blocksFromFloor = blocksFromFloor + 1
  if turtle.detectUp() then
   emptyBlocks = 0
  else
   emptyBlocks = emptyBlocks + 1
  end
 end
 t.down(blocksFromFloor)
end

function placeBelow()
 local blocksBelowFloor = 0
 while not turtle.detectDown() do
  t.down()
  blocksBelowFloor = blocksBelowFloor + 1
 end
 t.up()
 if turtle.getItemCount(2) < blocksBelowFloor+1 then
  if t.restock(2,3,true) then
  -- keep going
  else
    t.restock(2,3,false)
  end
 end
 t.placeRow("down",2,"up",blocksBelowFloor-1)
 t.placeDown(2)
end

function digLine()
 local blocksDug = 0
 while blocksDug < digLength-1 do
  t.forward()
  blocksDug = blocksDug + 1
  if turtle.detectUp() then
   digUpUntilEmpty()
  end
  if not turtle.detectDown() then
   placeBelow()
  end
 end
 if lastLine then
  return
 end
 if currentLine % 2 == 0 then
  t.right()
  t.forward()
  t.right()
 else
  t.left()
  t.forward()
  t.left()
 end
  if turtle.detectUp() then
   digUpUntilEmpty()
  end
  if not turtle.detectDown() then
   placeBelow()
  end
end

-- Main Program loop
fuelRequired = (digLength*digWidth)*3
print("Fuel required: ~"..fuelRequired)
t.refuel(fuelRequired,2)
for i=1,digWidth do
 digLine()
 if i == digWidth - 1 then
  lastLine = true
 end
 currentLine = currentLine + 1
end
if digWidth % 2 == 0 then
 t.strafeRight(digWidth-1)
else
 t.turnAround()
 t.forward(digLength-1)
 t.strafeRight(digWidth-1)
end
t.turnAround()
print("")
print("Done!")