View difference between Paste ID: ti3HtWk4 and BgmBvBFm

--- Programmed:  17 May 2014
+
--- by Skyler James
+if #tArgs ~= 2 then
---
+	print( "Usage: bridge <length> <direction of landmark (L, R, B)>" )
--- Builds a bridge <length>
+
--- blocks long, 1 block wide
+
---
+
--- The blocks to be used in
+
--- the bridge MUST be placed
+
--- in slot 9. There is error
+
--- checking to ensure this.
+
---
+
--- Turtle will NOT break any
+
--- blocks in its way
+
 -- Check that there are <length>
 -- blocks provided in slot 9
-if #tArgs ~= 1 then
+--local numblocks = turtle.getItemCount(9)
-	print( "Usage: bridge <length>" )
+--if numblocks < length then
 --	print("Please place at least "..length.." building blocks in slot 9")
 --	return
 --end
 
 -- Place a block underneath
 -- the turtle to build bridge
 function putblockdown()
 	if not (turtle.detectDown()) then
 		turtle.select(9)
 		turtle.placeDown()
 	end
 end
-local numblocks = turtle.getItemCount(9)
+
-if numblocks < length
+-- Place Landmark in front
-	print("Please place at least "..length.." building blocks in slot 9")
+function placelm()
     if tArgs[2] == "R" then
         if not (turtle.detect()) then
         	turtle.turnRight()
             turtle.forward()
             turtle.select(9)
 		    turtle.placeDown()
             turtle.back()
           	turtle.select(10)
             turtle.place()
             turtle.turnLeft()
         end
     end
 if tArgs[2] == "L" then
         if not (turtle.detect()) then
         	turtle.turnLeft()
             turtle.forward()
-for i,length,1 do
+            turtle.select(9)
-	if (turtle.detect()) then
+		    turtle.placeDown()
-		break
+            turtle.back()
-	else
+          	turtle.select(10)
-		putblockdown()
+            turtle.place()
-		turtle.forward()
+            turtle.turnRight()
         end
     end
 if tArgs[2] == "B" then
         if not (turtle.detect()) then
         	turtle.turnRight()
             turtle.forward()
             turtle.select(9)
 		    turtle.placeDown()
             turtle.back()
           	turtle.select(10)
             turtle.place()
             turtle.turnLeft()
             turtle.turnLeft()
             turtle.forward()
             turtle.select(9)
 		    turtle.placeDown()
             turtle.back()
           	turtle.select(10)
             turtle.place()
             turtle.turnRight()
         end
     end
 end
 
 function backhome()
     x = length
     while x > 0 do
 	-- putblockdown()
 	turtle.back()
     x = x - 1
 	end
 end
 -- Move forward <length> times
 -- and build a bridge with
 -- blocks provided in slot 9
 local i = 0
 while i < length do
 	-- putblockdown()
 	turtle.forward()
     i = i + 1
 end
 
 placelm()
 backhome()
 
 -- That's all, folks!
 print("Built a bridge "..i.." blocks long")
 return