Updated the file to support modules.lua and check fuel

The app now checks if it has enough fuel and if not, it asks for more.
Additionally it digs everythin in front of it, except for the last block.

Tree_Farm/farmtree.lua

@@ -1,10 +1,10 @@
 --[[Tree Farming App by Al Sweigart
 Plants tree and cuts it down.]]
 
-os.loadAPI('hare.lua') -- Load the hare module
+os.loadAPI('modules.lua') -- Load the modules module
 
 local NUM_OF_TREES = 4
-local TREE_SAPLING = 'spruce'
+local TREE_SAPLING = 'oak'
 
 -- Check if choptree program exists
 if not fs.exists('choptree.lua') then
@@ -14,11 +14,10 @@ end
 while true do
   -- First of all, wait a few minutes
   os.sleep(300)
-    -- Check if turtle has enough fuel
-    if turtle.getFuelLevel() < (2 * (3 * NUM_OF_TREES)) then
-	hare.selectItem('minecraft:' .. TREE_SAPLING .. 'log')
-	turtle.refuel(2)
-    end
+
+  -- Sort all Items together
+  modules.sort_items()
+
 
   -- Empty everything except for the saplings
   for i = 1, 16 do
@@ -32,19 +31,25 @@ while true do
 
 
   -- Check if we have saplings in our inventory
-    if not hare.selectItem('minecraft:' .. TREE_SAPLING .. '_sapling') then
+  if not modules.select_item('minecraft:' .. TREE_SAPLING .. '_sapling') then
     error('Out of ' .. TREE_SAPLING .. ' saplings')
   end
 
   -- Build a Loop, where we plant and cut trees
+  turtle.turnLeft()
+  turtle.turnLeft()
   for i = 1, NUM_OF_TREES do
-	turtle.back()
-	turtle.back()
-	turtle.back()
-	turtle.turnRight()
+    for j = 1, 3 do
+      check_fuel()
+      if i ~= 3 * NUM_OF_TREES then
+        turtle.dig()
+      end
+      turtle.forward()
+    end
+    turtle.turnLeft()
     blockExists, item = turtle.inspect()
     if blockExists and item['name'] == 'minecraft:' .. TREE_SAPLING .. '_log' then
-	    hare.selectEmtySlot()
+      modules.selectEmptySlot()
       shell.run('choptree.lua') -- Run Choptree
     elseif blockExists and item['name'] ~= 'minecraft:' .. TREE_SAPLING .. '_sapling' then
       print('Error! Wrong block')
@@ -56,16 +61,22 @@ while true do
         turtle.back()
       else
         turtle.back()
-		hare.selectItem('minecraft:' .. TREE_SAPLING .. '_sapling')
+        modules.selectItem('minecraft:' .. TREE_SAPLING .. '_sapling')
         turtle.place()
       end
     end
-	turtle.turnLeft()
+    turtle.turnRight()
   end
 
   -- Move forward to the chest again
+  turtle.turnLeft()
+  turtle.turnLeft()
   for i = 1, (3 * NUM_OF_TREES) do
-        turtle.forward()
+    check_fuel()
+    if i ~= 3 * NUM_OF_TREES then
+      turtle.dig()
+    end
+    turtle.foward()
   end
 
 end