Tree Tjop

local tree
local bool
local y = 0
local saplingCount

-- forestry:sapling_ge
-- forestry:logs.0
-- metadata 3

local saplingTable = {
    "minecraft:sapling",
    "forestry:sapling_ge",
    "forestry:sapling"
}

local logTable = {
    "minecraft:log",
    "forestry:logs.0"
}

function validSapling(val)
    for index, value in ipairs(saplingTable) do
        if value == val then
            return true
        end
    end

    return false
end

function validLog(val)
    for index, value in ipairs(logTable) do
        if value == val then
            return true
        end
    end

    return false
end

while true do
    print("looping")
    turtle.select(1)
    if turtle.getSelectedSlot(1) then
        local data = turtle.getItemDetail()
        if validSapling(data.name) == false then
            print("no saplings found in slot 1")
            return
        else
            saplingCount = data.count
        end
    end

    repeat
        if turtle.detect() or turtle.place() then
            pBool = true
        end
        print("attempting to place")
    until pBool == true

    repeat
        bool,tree = turtle.inspect()
        print("inspecting")
        os.sleep(10)
    until validLog(tree.name)

    if turtle.getFuelLevel() < 10 then
        print("OUT OF FUEL")
        return
    end

    turtle.dig()
    turtle.forward()

    while turtle.detectUp() == true do
        print("Chopping")
        for i=1,4 do
            turtle.dig()
            turtle.turnLeft()
        end
        turtle.digUp()
        turtle.up()
        y = y + 1
    end

    while y > 0 do
        print("returning")
        turtle.down()
        y = y - 1
    end

    turtle.back()
end