ComputerCraft/Tree_Farm/farmtree.lua

--[[Tree Farming App by Al Sweigart
Plants tree and cuts it down.]]

os.loadAPI('hare.lua') -- Load the hare module

local NUM_OF_TREES = 4
local TREE_SAPLING = 'spruce'
local blockExists, item
local logCount = 0

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

while true do
    -- First, empty the whole turtle
    for i = 1, 16 do
	turtle.select(i)
	turtle.drop()
    end

    -- Check if turtle has enough fuel
    if turtle.getFuelLevel() < (2 * (3 * NUM_OF_TREES)) then
	hare.getItemFromChest('minecraft:' .. TREE_SAPLING .. '_log')
	turtle.craft()
	hare.selectItem('minecraft:' .. TREE_SAPLING .. 'plan')
	turtle.refuel()
    end

    -- Take one stack of Saplings from the Chest
    if not hare.getItemFromChest('minecraft:' .. TREE_SAPLING .. '_sapling') then
        error('Out of saplingurtle.craft()  -- craft stone brickss')
    end
    
    -- Build a Loop, where we plant and cut trees
    for i = 1, NUM_OF_TREES do
	turtle.back()
	turtle.back()
	turtle.back()
	turtle.turnRight()
	blockExists, item = turtle.inspect()
	if blockExists and item['name'] == 'minecraft:' .. TREE_SAPLING .. 'log' then
            shell.run('choptree.lua') -- Run Choptree
	elseif block Exists and item['name'] ~= 'minecraft:' .. TREE_SAPLING .. 'sapling' then
	    turtle.drop()

    print('Planting...')
    turtle.place() -- plant sapling
    
    -- Loop until tree is grown
    while true do
        blockExists, item = turtle.inspect()
        if item['name'] ~= 'minecraft:spruce_log' then
            print('wait 5 seconds')
            os.sleep(5)
        else
            break -- tree has grown
        end 
    end
    hare.selectEmptySlot()
    shell.run('choptree.lua') -- run choptree
  
    -- move to and face chest
    turtle.back()
    turtle.turnLeft()
    turtle.turnLeft()
  
    -- put logs into chest
    while hare.selectItem('minecraft:spruce_log') do
        logCount = logCount + turtle.getItemCount()
        print('Total logs: ' .. logCount)
        turtle.drop()
    end
  
    --face planting sport
    turtle.turnLeft()
    turtle.turnLeft()
end