oak/birch/spruce Tree Farm

local sleepTime = 0

if #arg == 1 then
    sleepTime = tonumber(arg[1])

    if sleepTime == 0 then
        print("Please set the sleep time between each check.")
        return
    end
else
    print("There needs to be one correct argument (e.g. logger 5)")
    return
end

local WOODS = {
    "minecraft:oak_log",
    "minecraft:birch_log",
    "minecraft:spruce_log"
}

function cleanInspectDown()
    local hasBlock, data = turtle.inspectDown()
    local name = textutils.serialize(data.name)
    local name2 = name:gsub("\"", "")
    local val = string.sub(name2, 0, string.len(name) - 2)
    return val
end

function cleanInspectUp()
    local hasBlock, data = turtle.inspectUp()
    local name = textutils.serialize(data.name)
    local name2 = name:gsub("\"", "")
    local val = string.sub(name2, 0, string.len(name) - 2)
    return val
end

function cleanInspect()
    local hasBlock, data = turtle.inspect()
    local name = textutils.serialize(data.name)
    local name2 = name:gsub("\"", "")
    local val = string.sub(name2, 0, string.len(name) - 2)
    return val
end

function down()
    local down = false
    for x = 1, #WOODS do
        if cleanInspectDown() == WOODS[x] then
            down = true
            return down
        end
    end
end

function up()
    local down = false
    for x = 1, #WOODS do
        if cleanInspectUp() == WOODS[x] then
            down = true
            return down
        end
    end
end

local SAPLINGS = {
    "minecraft:oak_sapling",
    "minecraft:birch_sapling",
    "minecraft:spruce_sapling"
}

local INVENTORY_SIZE = 16

function plant()
    turtle.select(1)
    for i = 1, INVENTORY_SIZE do
        turtle.select(i)
        local currentItem = turtle.getItemDetail(i)
        if currentItem ~= nil then
            local isAcceptedItem = false
            for x = 1, #SAPLINGS do
                if currentItem.name == SAPLINGS[x] then
                    turtle.select(i)
                    turtle.place()
                    return
                end
            end
        end
    end
end

function log()
    turtle.dig()
    turtle.forward()
    if down() then
        local continue = true
        local num = 0
        repeat
            turtle.digDown()
            turtle.down()
            if not down() then
                continue = false
            end
            num = num + 1
        until(continue == false)
        local a = 0
        repeat
            turtle.up()
            a = a + 1
        until(a == num)
    end
    local continue = true
    local num = 0
    repeat
        turtle.digUp()
        turtle.up()
        if not up() then
            continue = false
        end
        num = num + 1
    until(continue == false)
    local a = 0
    repeat
        turtle.down()
        a = a + 1
    until(a == num)
    turtle.back()
    plant()
end

function logFront()
    local down = false
    for x = 1, #WOODS do
        if cleanInspect() == WOODS[x] then
            down = true
            return down
        end
    end
end

function saplingFront()
    local down = false
    for x = 1, #SAPLINGS do
        if cleanInspect() == SAPLINGS[x] then
            down = true
            return down
        end
    end
end

local FUELS = {
    "minecraft:coal_block",
    "minecraft:coal",
    "minecraft:lava_bucket",
    "minecraft:spruce_log",
    "minecraft:oak_log",
    "minecraft:birch_log"
}

function refuel(slot_number)
    print("[TURTLE] Refueling... ")
    turtle.select(slot_number)
    turtle.refuel()
    print("[TURTLE] Nom. Nom. Nom.")
end

-- Check the current fuel level
function checkFuelLevel()
    local requiredFuelLevel = math.ceil(500)
    local currentFuelLevel = turtle.getFuelLevel()

    --print("[TURTLE] Current fuel level is: "..currentFuelLevel.." - Required: "..requiredFuelLevel)

    if currentFuelLevel < requiredFuelLevel then

        print("[TURTLE] Attempting to locate fuel.")

        for i = 1, INVENTORY_SIZE do
            local currentItem = turtle.getItemDetail(i)
            if currentItem ~= nil then
                for x = 1, #FUELS do
                    if currentItem.name == FUELS[x] then
                        print("[TURTLE] Acceptable fuel found: " ..FUELS[x])

                        if currentFuelLevel < requiredFuelLevel then
                            refuel(i)
                        else
                            return true
                        end
                    end
                end
            end
        end
        print("[TURTLE] No acceptable fuel or not enough found, terminating program...")
        return false
    else
        return true
    end
end

function check()
    if logFront() then
        print("[TURTLE] Chopping!")
        log()
        checkFuelLevel()
    elseif not saplingFront() then
        print("[TURTLE] Planting!")
        plant()
        checkFuelLevel()
    else
        print("[TURTLE] Lurking!")
        checkFuelLevel()
    end
end

while true do
    print("Checking...")
    check()
    sleep(sleepTime)
end