View difference between Paste ID: wA7q4iB0 and Ln2CWBVP

 local length = 160
 local width = 160
 local mining = true
 local l = 0
 local w = 0
 local clean = 32
 local clean_count = 0
 local turn = 1--1=>right,-1=>left
 
 --fuel is first slot
 --then important blocks
 --then inventory
 --overlapping is undefined (except fuel slot being important)
 --gaps are undefined (except btwn important_end and inven_start, blocks there will be collected but only up to one stack)
 local fuel = 1
 local important_start = 1
 local important_end = 3
 local inven_start = important_end+1
 local inven_end = 16
 
 function refuel()--returns false if it ran out of coal and has low energy
     if turtle.getFuelLevel() < 3 then
         if turtle.getItemCount(1) <= 1 then
             return false
         else
             print("Refueling")
             turtle.refuel(1)
             print("new fuel level: "..turtle.getFuelLevel())
             print("remaing fuel: "..turtle.getItemCount(1))
             return true
         end
     end
     return true
 end
 
 function dig_forward()--returns if it can dig and move forward
     while turtle.detect() do
         turtle.dig()
     end
     local rtn = turtle.forward()
     while turtle.detectUp() do
         turtle.digUp()
     end
     while turtle.detectDown() do
         turtle.digDown()
     end
     return rtn
 end
 
 function clean_inventory()--returns false if inventory is full of important blocks
     local full = 0
     local selected = turtle.getSelectedSlot()
     for i=inven_start,inven_end do
         turtle.select(i)
         drop = true
         for i=important_start,important_end do
             if turtle.compareTo(i) then
                 drop = false
             end
         end
         if drop then
             turtle.drop()
         end
         if turtle.getItemSpace(i) == 0 then
             full = full+1
         end
     end
     turtle.select(selected)
 
     if full >= inven_end - inven_start + 1 then
         return false
     else
         return true
     end
 end
 
 while mining do
     dig_forward()
     l = l+1
     if l>length then
         if turn > 0 then
             turtle.turnRight()
             dig_forward()
             turtle.turnRight()
         else
            turtle.turnLeft()
            dig_forward()
            turtle.turnLeft()
         end
         turn = turn*-1
         l = 0
         w = w+1
         if w > width then
             print("End or route")
             w = 0
             mining = false
         end
     end
 
     if clean_count >= clean then
         if not clean_inventory() then
             print("Inventory full")
             mining = false
         end
         clean_count = 0
     else
         clean_count = clean_count + 1
     end
 
     if not refuel() then
         print("out of fuel")
         mining = false
     end
 end