startup

--[[Tree Farming Program by Al Swigart
--Plants trees in a line
--then cuts them down.]]

os.loadAPI('hare') -- load the hare module

local blockExists, item
local logCount = 0
function goFwd()
  turtle.forward()
  turtle.forward()
end

-- check if choptree program exists
if not fs.exists('choptree') then
  error('You must install choptree program first.')
end

while true do
  -- check inventory for saplings
  if not hare.selectItem('minecraft:sapling') then
    error('Out of saplings.')
  end

  print('Planting...')
  turtle.place() -- plant sapling

  -- loop until a tree has grown
  while true do
    blockExists, item = turtle.inspect()
    if blockExists and item['name'] == 'minecraft:sapling' then
      print("Not yet grown.")
      os.sleep(30)
    else
      break -- tree has grown
    end
  end
  -- goes down the line checking each tree and cutting down the grown ones
  shell.run("choptree")
  turtle.place()
  while not blockExists and item['name'] == 'minecraft:cobblestone' do
    turtle.turnRight()
    goFwd()
    turtle.turnLeft()
    if blockExists and item['name'] == 'minecraft:log' then
        shell.run('choptree') -- run choptree
        hare.selectItem("minecraft:sapling")
        turtle.place()
    else
        print("Not yet grown.")
    end
  end
  -- returns to initial location
  turtle.turnLeft()
  for i = 1,12 do
    turtle.forward()
  end
  turtle.turnLeft()

  -- put logs into chest
  while hare.selectItem("minecraft:log") do
    logCount = logCount + turtle.getItemCount()
    print("Total logs: " .. logCount)
    turtle.drop()
  end

  -- face planting spot
  turtle.turnLeft()
  turtle.turnLeft()
end