View difference between Paste ID: uMGPhJCQ and Str34Geb

 -- Based on excavate from the original computercraft distribution
 -- written by hildenae
-rubberwood=1
+local rubberwood=1
-tool=2
+local tool=2
 -- electric hat has 200 uses.
 -- my size is 2 rows of 6 threes
 -- with a maxheight of 7 - this leves 4 uses
 local width = 6
 local rows = 2
 local MAX_USES=200
 local uses = 0
 local depth = 0
 local xPos,zPos = 0,0
 local xDir,zDir = 0,1
 
 local function turnLeft()
 	turtle.turnLeft()
 	xDir, zDir = -zDir, xDir
 end
 
 local function turnRight()
 	turtle.turnRight()
 	xDir, zDir = zDir, -xDir
 end
 
 function goTo( x, y, z, xd, zd )
 	while depth > y do
 		if turtle.up() then
 			depth = depth - 1
 		else
 			return false
 		end
 	end
 
 	if xPos > x then
 		while xDir ~= -1 do
 			turnLeft()
 		end
 		while xPos > x do
 			if turtle.forward() then
 				xPos = xPos - 1
 			else
 				return false
 			end
 		end
 	elseif xPos < x then
 		while xDir ~= 1 do
 			turnLeft()
 		end
 		while xPos < x do
 			if turtle.forward() then
 				xPos = xPos + 1
 			else
 				return false
 			end
 		end
 	end
 
 	if zPos > z then
 		while zDir ~= -1 do
 			turnLeft()
 		end
 		while zPos > z do
 			if turtle.forward() then
 				zPos = zPos - 1
 			else
 				return false
 			end
 		end
 	elseif zPos < z then
 		while zDir ~= 1 do
 			turnLeft()
 		end
 		while zPos < z do
 			if turtle.forward() then
 				zPos = zPos + 1
 			else
 				return false
 			end
 		end
 	end
 	while depth < y do
 		if turtle.down() then
 			depth = depth + 1
 		else
 			return false
 		end
 	end
 	while zDir ~= zd or xDir ~= xd do
 		turnLeft()
 	end
 	return true
 end
 
 local function forward()
 	turtle.forward()
 	xPos = xPos + xDir
 	zPos = zPos + zDir
 	return true
 end
 
 local function down()
 	if turtle.down() then
 		depth = depth + 1
 		return true
-	if turtle.compareTo(rubberwood) then
+
-	  	turtle.select(tool)
+
 	end
 end
 
 local function harvest()
 	turtle.select(rubberwood)
 	if turtle.compare() then
-	while(down()) do
+		turtle.select(tool)
 		turtle.place()
 		uses = uses + 1
 	else
 		print("not wood")
 	end
 end
 
 local function downTree()
 	local x,y,z,xd,zd = xPos,depth,zPos,xDir,zDir
 	repeat
 		harvest()
 	until not down()
 	goTo( x,y,z,xd,zd )
 end
 
 local function moveRight()
 	turnRight()
 	forward()
-	downTree()
+
 end
-	downTree()
+
 	turnLeft()
-	downTree()
+
 	turnRight()
 end
 local function turn180()
 	turnRight()
 	turnRight()
 end
 local function harvestRow()
 	local w = width
 	while(w > 0) do
 		downTree()
 		moveRight()
 		w = w -1
 	end
 	forward()
 	turnLeft()
 	downTree() -- check side for resin
 	moveRight()
 	turnLeft()
 	w = width
 	while(w > 0) do
 		moveRight()
 		downTree()
 		w = w -1
 	end
 	moveRight()
 	forward()
 	turnLeft()
 	downTree() -- check side for resin
 end
 
 run = true
 while run do
 
 	local r = rows
 	forward()
 	while (r > 0) do
 		harvestRow()
 		moveLeft()
 		forward()
 		turnLeft()
 		r = r -1
 	end
 
 	moveLeft() -- move out to the side
 	turn180()
 	for i = 0, rows, 2 do
 		print ("moving forward 2")
 		forward()
 		forward()
 	end
 	print("uses: ")
 	print (uses)
 
 	-- go to charge station
 	goTo(0,0,0,0,1)
 	run = false
 end