tree

-- tree
-- Cut down a single tree directly in front of turtle
-- Trees must be 1x1 trunks with no branches
-- Program assumes turtle is pre-fueled
-- Written by HarvDad, April 2014

args = {...}
nArgs = #args

version = "tree: Rev 0.1"
mission = "Cut down a single tree"

usage = "tree"

x = 0
y = 0
z = 0
face = 0
missionMessage = "Mission complete."
abort = false
local currentFuelLevel = turtle.getFuelLevel()

-- The following 'face' directions are relative to the starting position of the turtle in this program
north = 0
west = 1
south = 2
east = 3

areaCovered = 1
currentSlot = 2
materialSlot = 1
maxSlot = 16

nextTurn = "left"

function setFace(f)
	if f == 0 then
	  if face == 0 then return end
	  if face == 1 then right() return end
	  if face == 2 then right() right() return end
	  if face == 3 then left() return end
	end

	if f == 1 then
	  if face == 0 then left() return end
	  if face == 1 then return end
	  if face == 2 then right() return end
	  if face == 3 then right() right() return end
	end

	if f == 2 then
	  if face == 0 then left() left() return end
	  if face == 1 then left() return end
	  if face == 2 then return end
	  if face == 3 then right() return end
	end

	if f == 3 then
	  if face == 0 then right() return end
	  if face == 1 then left() left() return end
	  if face == 2 then left() return end
	  if face == 3 then return end
	end
end

function forward()
	for i=1,10 do				-- This loop trys to handle pests (mob) that might be in the way
		if turtle.forward() then
			break
		end
		turtle.attack()
		sleep(2)
	end
	areaCovered = areaCovered + 1

  	if face == 0 then z = z+1 return end
  	if face == 1 then x = x-1 return end
  	if face == 2 then z = z-1 return end
  	if face == 3 then x = x+1 return end
end

function left()
 if face == 0 then face = 1 turtle.turnLeft() return end
 if face == 1 then face = 2 turtle.turnLeft() return end
 if face == 2 then face = 3 turtle.turnLeft() return end
 if face == 3 then face = 0 turtle.turnLeft() return end
 print("function left\(\): Bad face value: ", face)
end

function right()
 if face == 0 then face = 3 turtle.turnRight() return end
 if face == 1 then face = 0 turtle.turnRight() return end
 if face == 2 then face = 1 turtle.turnRight() return end
 if face == 3 then face = 2 turtle.turnRight() return end
 print("function right\(\): Bad face value: ", face)
end

function up()
	for i=1,10 do
	  if not turtle.up() then
	  	if turtle.detectUp() then
		  digUp()
		else
			turtle.attackUp()
			sleep(2)
	    end
	  else
	  	break
	  end
	end
	y = y+1
end

function down()
	for i=1,10 do
	  if not turtle.down() then
	  	if turtle.detectDown() then
		  digDown()
		else
			turtle.attackDown()
			sleep(2)
	     end
	  else
	  	break
	  end
	end
	y = y-1
end

function chopTree()
	turtle.dig()
	forward()
	while turtle.detectUp() do
		turtle.digUp()
		turtle.up()
	end

	while not turtle.detectDown() do
		turtle.suckDown()
		turtle.down()
	end
end

function replantTree()
	if turtle.getItemCount(saplingSlot) > 0 then
		left()
		left()
		turtle.select(saplingSlot)
		turtle.place()
		left()
		left()
	end
end

-- Main program

chopTree()
replantTree()

if abort then
	print("Mission aborted")
end
print(missionMessage)