View difference between Paste ID: 4HLi33cn and jMuZxGSQ

 -- http://pastebin.com/4HLi33cn
 f,u,d=false,false,false
 
 function look()
   print("look")
   local test,data = turtle.inspect()
   f = test and data or false
   test,data = turtle.inspectUp()
   u = test and data or false
   test,data = turtle.inspectDown()
   d = test and data or false
 end
 
 function step()
   print("step")
   look()
   if d and (
     d.name=="minecraft:stone"
     or d.name=="minecraft:dirt"
     or d.name=="minecraft:grass"
   )
   and not f then
     print("plant sapling")
     turtle.select(1)
     turtle.place()
   elseif f and f.name=="minecraft:sapling" then
     print("drop bonemill")
     turtle.select(2)
     turtle.place()
   elseif f and f.name=="minecraft:log" then
     print("Cutting")
     turtle.select(5)
     turtle.dig()
     turtle.digUp()
     turtle.up()
   elseif not f or f.name~="minecraft:log"
   and not d then
     print("landing")
     turtle.down()
   end
 end
 
 function main()
   local timer = os.startTimer(.5)
   while true do
     local e,k = os.pullEvent()
     if e=="key" and k==keys.t then
       break
     elseif e=="timer" then
       step()
       timer = os.startTimer(.5)
     end
   end
 end
 
 
 main()