View difference between Paste ID: B6eHEeH3 and PPXUJmfc

 local tArgs = { ... }
 if #tArgs ~= 3 then
 	print( "Usage: <program> <far> <dump> <depth>" )
 	return
 end
 
 -- Mine in a one-wide pattern until we hit something we can't dig
 local size = tonumber( tArgs[1] )
 local gDump = tonumber( tArgs[2] )
 local tStop = tonumber( tArgs[3] )
 if size < 1 then
 	print( "Excavate outward must be positive" )
 	return
 end
 if tStop < 1 then
 	tStop = 255
 end
 if gDump < 1 then
 	gDump = 1
 end
 
 local xDir = 0
 local yDir = 1
 local myX = 0
 local myY = 0
 local myZ = 0
 local depth = 0
 local collected = 0
 local aDump = 0
 local cPos = 0
 local reseal = false
 local done = false
 local lastDepth = 0
 local bedrock = false
 local fcDown = 0
 local fcPush = 0
 
 local function findFuel()
 	if turtle.getFuelLevel() < 1 then
 		for i = 1, 16 do -- loop through the slots
   			turtle.select(i) -- change to the slot
   			if turtle.refuel(0) then -- if it's valid fuel
     			local halfStack = math.ceil(turtle.getItemCount(i)/2) -- work out half of the amount of fuel in the slot
     			turtle.refuel(halfStack) -- consume half the stack as fuel
 				return true
   			end
-local function proxyDown()
+
-	if not turtle.down() then
+
-		print ("Move down failed. Checking fuel...")
+		return true
-		if not findFuel() then
+
-			print ("Out of fuel!")
+
 end
 
-			if not turtle.down() then
+
-				print ("Something in the way! Bedrock?")
+
-				return false
+
-			end
+
 	end
 	while turtle.back() == false do
-	return true
+
 	end
 	turtle.turnLeft()
-local function proxyForward()
+
 	turtle.select(1)
-		print ("Move forward failed. Checking fuel...")
+
-		if not findFuel() then
+
-			print ("Out of fuel!")
+
 	turtle.select(3)
 	turtle.drop()
-			if not turtle.forward() then
+
-				print ("Something in front!")
+
-				return false
+
-			end
+
 	turtle.select(6)
 	turtle.drop()
-	return true
+
 	turtle.drop()
 	turtle.select(8)
-local function proxyUp()
+
-	if not turtle.up() then
+
-		print ("Move forward failed. Checking fuel...")
+
-		if not findFuel() then
+
-			print ("Out of fuel!")
+
 		sleep(0.8)
 	end
-			if not turtle.up() then
+
-				print ("Something in front!")
+
-				return false
+
 	turtle.turnLeft()
 	turtle.turnLeft()
 end
-	return true
+
 local function collect()
 	-- print( "Collect Called" )
 	collected = collected + 1
 	if math.fmod(collected, 25) == 0 then
 		print( "Mined "..collected.." blocks." )
 	end
 
 	for n=1,9 do
 		if turtle.getItemCount(n) == 0 then
 			return true
 		end
 	end
 
 	print( "No empty slots left." )
 	print (" Going Home to Dump. ")
 	lastDepth = depth
 	goHome()
 	return false
 end
 
 local function digFront()
 	if turtle.dig() then
 		collect()
 		return true
 	else
 		return false
 	end
 end
 
 local function digDown()
 	if turtle.digDown() then
 		collect()
 		return true
 	end
 	return false
 end
 
 local function digUp()
 	if turtle.digUp() then
 		collect()
 		return true
 	end
 	return false
 end
 
 local function moveForward()
 	if not findFuel() then
 		return false
 	end
 	if not turtle.forward() then
 		if not digFront() then
 			return false
 		end
 	else
 		myX = myX + xDir
 		myY = myY + yDir
 		return true
 	end
 	return false
 end
-local function tryPush()
+
-	if not proxyForward() then
+local function faceLeft()
-		if turtle.dig() then
+	yd = yDir
-			collect()
+	xd = xDir
-	    else
+	-- 0,1 -> -1,0
-			fcPush = fcPush + 1
+	-- -1,0 -> 0,-1
-			-- give sand a chance to fall
+	-- 0,-1 -> 1,0
- 			sleep(0.8)
+	-- 1,0 -> 0,1
-	    	if turtle.dig() then
+
-	    		collect()
+	-- 0,1 -> -1
-	    	else
+	-- -1,0 -> 0
-				fcPush = fcPush + 1
+	-- 0,-1 -> 1
-		    	return false
+	-- 1,0 -> 0
-		    end
+
-	    end
+	-- 0,1 -> 0
 	-- -1,0 -> -1
-		cPos = cPos + 1
+	-- 0,-1 -> 0
 	-- 1,0 -> 1
-	return true
+	xDir = -1*yd
 	yDir = xd
 	turtle.turnLeft()
-local function tryDown()
+
--- print (" Down Called ")
+
-	if not proxyDown() then
+local function faceRight()
-		print (" Can't move down, trying dig... ")
+	yd = yDir
-		if turtle.digDown() then
+	xd = xDir
-			collect()
+	-- 0,1 -> 1,0
-	    else
+	-- 1,0 -> 0,-1
-			fcDown = fcDown + 1
+	-- 0,-1 -> -1,0
 	-- -1,0 -> 0,1
-		if not proxyDown() then
+
-			fcDown = fcDown + 1
+	-- 0,1 -> 1
-			print ("Move down failed.")
+	-- 1,0 -> 0
 	-- 0,-1 -> -1
-			depth = depth + 1
+	-- -1,0 -> 0
 
 	-- 0,1 -> 0
 	-- 1,0 -> -1
 	-- 0,-1 -> 0
-	print (" I moved down. ")
+	-- -1,0 -> 1
-	return true
+
 	xDir = yd
 	yDir = -1 * xd
 	turtle.turnRight()
 end
 
 
 local function goHome()
 print( " Coming Home... From Depth: "..depth )
 	while depth > 0 do
 		if proxyUp() == true then
 			print ( "Updiddy: "..depth  )
 			depth = depth - 1
 		else
 			turtle.digUp()
 			print ( "Up is blocked, panicing." )
 		end
 
 	end
 
 	while cPos > 0 do
 		if turtle.back() == false then
 			print ( "Back is blocked, panicing." )
 			turtle.turnLeft()
 			turtle.turnLeft()
 			turtle.dig()
 			turtle.turnLeft()
 			turtle.turnLeft()
 		else
 			cPos = cPos - 1
 		end
 	end
 	print ( "Now Home, failed: "..(fcDown+fcPush).." times." )
 
 	dump()
 
 	if done == false then
 	print ( " Going back to work. " )
 		while depth < lastDepth do
 			if tryDown() == true then
 				-- D
 			end
 		end
-local function goOut()
+
-	while cPos < size do
+
-		if tryPush() == false then
+
 
-			-- print( "Not Moving " )
+
 	if not turtle.digDown() then
-			-- print( "Moving" )
+
 		return false
 	else
 		depth = depth + 1
 		print ( " Layer: "..depth )
 	end
-local function comeBack()
+
 
-		if turtle.back() == true then
+local function digLocal()
 	digDown()
 	digUp()
 	digFront()
 end
 
 local function digLine()
 	while (myY < size) do
-			-- print ( "Move your ass" )
+		digLocal()
 		moveForward()
-		-- print (cPos)
+
 	digUp()
 	while (myY > 0) do
 		digDown()
 		moveBack()
-	if tryDown() == false then
+
 end
 
 local function newLine()
-		-- depth = depth + 1
+	faceRight()
 	digFront()
 	moveForward()
 	faceLeft()
 end
-local fcTotal = 0
+
 local function digall()
 	while (~done == true) do
-	while (done ~= true) do
+		while (myX < size)  do
-		fcTotal = fcPush + fcDown
+			digLine()
-		print ("Fails: "..fcPush.." : "..fcDown)
+			faceRight()
-		if fcTotal > 2 then
+			digFront()
-			done = true
+			moveForward()
 			faceLeft()
-		if (depth > tStop) then
+
-			done = true
+		digLine()
 		digDown()
-		goOut()
+		moveDown()
-		comeBack()
+		digDown()
-		if digDown() == false then
+		moveDown()
-			done = true
+		while (myX > 0)  do
 			digLine()
 			faceLeft()
 			digFront()
 			moveForward()
 			faceRight()
 		end
 		digLine()
 		digDown()
 		moveDown()
 		digDown()
 		moveDown()
 	end
 	print (" Done, Coming Home Last Time ")
 	done = true
 	goHome()
 end
 
 digall()