treebot2.0

-- Keeps track of what side the tree is on true is right false is left
local wSide = true

-- Stay fueled up, uses the logs it harvests for fuel
local function fuelTime()
  if turtle.getFuelLevel() < 200 then
    turtle.select(2)
    turtle.refuel(1)
    turtle.select(1)
  end
end

local function chopTime()
-- Determines if the tree is on the left or right.
  if wSide then
    turtle.turnRight()
  else
    turtle.turnLeft()
  end
-- If there is somthing there try to harvest it.
  if turtle.detect() then
    turtle.dig()
    turtle.forward()
-- Climbs the tree
    while turtle.detectUp() do
      turtle.digUp()
      turtle.up()
    end
-- Goes back to the ground
    while not turtle.detectDown() do
      turtle.down()
    end
    turtle.back()
  end
-- If there is nothing there plant a sapling
  if not turtle.detect() then
    turtle.select(1)
    turtle.place()
  end
-- Determines what direction it wants to go
  if wSide then
    turtle.turnLeft()
  else
    turtle.turnRight()
  end
end

-- Moves to the next tree
local function nextRow()
  for i=1,4 do
    turtle.forward()
  end
end

-- Moves to the next column of trees
local function nextColumn()
  turtle.forward()
  if wSide then
    turtle.turnRight()
  else
    turtle.turnLeft()
  end
  for i=1,4 do
    turtle.forward()
  end
  if wSide then
    turtle.turnRight()
  else
    turtle.turnLeft()
  end
    turtle.forward()
-- Lets it know what side of the trees it is on
    wSide = not wSide
end

-- Returns back to the starting point
local function homeTime()
  for i=1,26 do
    turtle.back()
  end
    turtle.turnLeft()
  for i=1,24 do
    turtle.forward()
  end
  turtle.turnRight()
  wSide = true
end

-- Drops what it picked up into a water flow below
local function dropLoot()
  for i=3,16 do
    turtle.select(i)
    turtle.dropDown()
  end
  turtle.select(1)
end

-- make it run
while true do
  fuelTime()
  turtle.forward()
  turtle.forward()
  for i=1,7 do
    fuelTime()
    for n=1,7 do
      chopTime()
      dropLoot()
      if n < 7 then
        nextRow()
      end
    end
    if i < 7 then
      nextColumn()
    end
  end
  homeTime()
-- Pause for 2 min while the trees regrow
  os.sleep(120)
end