WoodChop

local function moveForward()
 for i = 1,6,1 do
  turtle.forward()
 end
end

local function checkFuel()
 if turtle.getFuelLevel() < 96 then
  turtle.select(1)
  turtle.refuel(1)
 end
end

local function getCoal()
 turtle.select(1)
 while turtle.getItemCount(1) < 16 do
  os.sleep(3)
  turtle.drop()
  turtle.suck()
 end
end

local function getSaplings()
turtle.select(2)
 while turtle.getItemCount(2) < 16 do
  os.sleep(3)
  turtle.drop()
  turtle.suck()
 end
end

local function getBonemeal()
 turtle.select(3)
 while turtle.getItemCount(3) < 4 do
  os.sleep(3)
  turtle.dropUp()
  turtle.suckUp()
 end
end

local function storeWood()
 chestfull = true
 while chestfull == true do
  for i=4,16,1 do
   if turtle.getItemCount(i) > 1 then
    turtle.select(i)
    items = turtle.getItemCount(i) - 1
    chestfull = turtle.drop(items)
   end
  end

  chestfull = not chestfull

  if chestfull == true and turtle.detectUp() == false then
   turtle.up()
  end

  if chestfull == true and turtle.detectUp() == true then
   print("Wood! Wood everywhere!!!")
   print("Try to add more vertical chests or take wood out of them.")
   if turtle.detectDown() == false then
    turtle.down()
   end
   os.shutdown()
  end
 end
 if turtle.detectDown() == false then
  turtle.down()
 end
end

local function plantTree()
 turtle.forward()
 turtle.forward()
 turtle.turnRight()
 turtle.select(2)
 turtle.place()
 turtle.turnLeft()
 turtle.back()
 turtle.place()
 turtle.turnRight()
 turtle.place()
 turtle.turnLeft()
 turtle.back()
 turtle.place()
 turtle.select(3)
 turtle.place()
end

local function getMaterials()
 turtle.turnRight()
 turtle.turnRight()
 moveForward()
 turtle.turnLeft()

 getSaplings()
 getBonemeal()

 turtle.turnRight()
 turtle.forward()
 turtle.select(4)
 items = turtle.getItemCount(4) - 1
 turtle.dropDown(items)

 storeWood()

 turtle.turnRight()
 getCoal()

 if redstone.getInput("back") == true then
  turtle.turnRight()
  moveForward()
  turtle.forward()
 else
  print("Shutdown by redstone signal!")
  os.shutdown()
 end
end

local function cutWood()
 local height = 0
 turtle.select(2)
 turtle.dig()
 turtle.forward()
 turtle.dig()
 while turtle.detectUp() do
  turtle.digUp()
  turtle.up()
  turtle.dig()
  height = height + 1
 end
 checkFuel()
 turtle.turnRight()
 turtle.dig()
 turtle.forward()
 turtle.turnLeft()
 turtle.dig()
 while height > 0 do
  turtle.digDown()
  turtle.down()
  turtle.dig()
  height = height - 1
 end
 turtle.back()
 turtle.turnLeft()
 turtle.forward()
 turtle.turnRight()
end




if redstone.getInput("back") == true then
 getCoal()
 checkFuel()
 if turtle.getItemCount(4) > 1 then
  turtle.turnLeft()
  storeWood()
  turtle.turnRight()
 end
 if turtle.getItemCount(2) < 16 then
  turtle.turnRight()
  turtle.forward()
  turtle.turnRight()
  getSaplings()
  turtle.turnRight()
  if turtle.getItemCount(3) < 4 then
   getBonemeal()
  end
  turtle.forward()
  turtle.turnRight()
 end
 turtle.turnRight()
 turtle.forward()
 moveForward()

 while true do
  checkFuel()
  local needMaterials = false
  if turtle.getItemCount(1) < 4 or turtle.getItemCount(2) < 4 then
   needMaterials = true
  end
  if turtle.getItemCount(3) == 0 or turtle.getItemCount(14) > 1 then
   needMaterials = true
  end
  if needMaterials == true then
   getMaterials()
  end
  plantTree()
  checkFuel()
  cutWood()
 end
else
 print("No redstone signal, no wood!")
end