Tree Farm Program - 1.19.2 / 1.20

if not fs.exists("/cfg.lua") then local f = fs.open("cfg.lua", "w") f.close() end
local f = fs.open("cfg.lua","r")
if f then t = textutils.unserialize(f.readAll()) f.close() end

if not t then t = {} end
if not t.active then t.active = false end
if not t.state then t.state = 1 end

if not t.cycles then t.cycles = 0 end

local states = {
    turtle.dig,
    turtle.forward,
    turtle.digUp,
    turtle.up,
    turtle.digUp,
    turtle.up,
    turtle.digUp,
    turtle.up,
    turtle.digUp,

    turtle.down,
    turtle.down,
    turtle.down,
    turtle.back,
}

local function refuel()
    turtle.select(1)
    term.setCursorPos(1,1) print("Refueling...")
    while turtle.getFuelLevel() == 0 do print("Requires More Fuel.") sleep(1) turtle.refuel(1) end
end

local function cleanInv()
    term.clear() term.setCursorPos(1,1) print("Cleaning Inventory...") sleep(2)
    for i=1, 16 do -- first 8 slots
        local info = turtle.getItemDetail(i)
        if info then
            turtle.select(i)
            if i == 1 then
                if info.name == "minecraft:oak_sapling" then
                    local info = turtle.getItemDetail(2)
                    if info then
                        if info.name ~= "minecraft:oak_sapling" then
                            turtle.select(2)
                            turtle.dropDown()
                        end
                        turtle.select(i)
                    end
                    turtle.transferTo(2,64-turtle.getItemCount(2))
                end
                if info.name ~= "minecraft:charcoal" then
                    turtle.dropDown()
                end
            elseif i == 2 then
                if info.name == "minecraft:coal" or info.name == "minecraft:charcoal" then
                    local info = turtle.getItemDetail(1)
                    if info then
                        if info.name ~= "minecraft:coal" or info.name ~= "minecraft:charcoal" then
                            turtle.select(2)
                            turtle.dropDown()
                        end
                        turtle.select(i)
                    end
                    turtle.transferTo(1,64-turtle.getItemCount(1))
                end
                if info.name ~= "minecraft:oak_sapling" then
                    turtle.dropDown()
                end
            elseif info.name == "minecraft:oak_sapling" and i ~= 2 then -- toss to slot 2
                if turtle.getItemCount(2) ~= 64 then
                    turtle.transferTo(2,64-turtle.getItemCount(2))
                end
                turtle.select(i)
                turtle.dropDown()
            elseif info.name == "minecraft:charcoal" and i ~= 1 then -- toss to slot 1
                if turtle.getItemCount(1) ~= 64 then
                    turtle.transferTo(1,64-turtle.getItemCount(1))
                end
                turtle.select(i)
                turtle.dropDown()
            else
                turtle.dropDown()
            end
        end
    end
end

local function doStates()
    term.clear() term.setCursorPos(1,1)
    print("Executing Program...")
    t.active = true
    while t.state < #states+1 do

        term.setCursorPos(1,2) print("Stage: ["..t.state.." / "..#states.."]")
        if turtle.getFuelLevel() == 0 then refuel() end
        states[t.state]()
        t.state = t.state + 1

        local f = fs.open("cfg.lua", "w")
        f.write(textutils.serialize(t)) f.close()

        sleep(.1)
    end
    t.active = false
    t.state = 1 -- just to make sure
    t.cycles = t.cycles+1

    local f = fs.open("cfg.lua", "w")
    f.write(textutils.serialize(t)) f.close()

    cleanInv()
end

term.clear()

if t.active then print("Picking up...") sleep(2) doStates() end

while true do

    term.clear()
    term.setCursorPos(1,1)
    print("Status: Idle")
    print("Cycles: "..t.cycles)
    print("Fuel Remaining: "..turtle.getFuelLevel().." ("..math.floor(turtle.getFuelLevel()/8).." Cycles)")
    local s,d = turtle.inspect()

    if s then
        if d.name == "minecraft:oak_log" then
            doStates()
        end
    end

    turtle.suck(64)
    turtle.suckUp(64)
    local info = turtle.getItemDetail(2)
    if info and not turtle.detect() then
        if info.name == "minecraft:oak_sapling" then turtle.select(2) turtle.place() end
    end

    sleep(1)
end