Tree

local m = require( "blib" )
local sapling = "minecraft:oak_sapling"
local bonemeal = "minecraft:bone_meal"
local log = "minecraft:oak_log"

function Main()
    while( m.GetItemIndex(sapling) ) do

        if( not m.CheckFuel(30) ) then
            print( "Out of fuel" )
            return
        end

        local boneSlot = m.GetItemIndex(bonemeal)
        local sapSlot = m.GetItemIndex( sapling )

        -- BONE CHECK / 'refuel bones'
        -- SAP CHECK / 'refuel saps'
        -- CHECK FULL?



        if(boneSlot ~= nil) then
            turtle.select(boneSlot)
            while( turtle.place() )do
                if( turtle.getItemCount() == 0 ) then
                    boneSlot = m.GetItemIndex(bonemeal)
                    if( boneSlot == nil ) then
                        print( "Out of bonemeal" ) -- Try getting more bonemeal from a chest or sum
                        return
                    end
                end
            end
            redstone.setOutput("back", true)
            os.sleep(1)
            redstone.setOutput("back", false)

            turtle.dig()
            turtle.forward()
            local success, data = turtle.inspectUp()
            while( data.name == log ) do
                turtle.digUp()
                turtle.up()
                success, data = turtle.inspectUp()
            end
            success, data = turtle.inspectDown()
            while(data.name ~= "minecraft:dirt") do
                turtle.down()
                success, data = turtle.inspectDown()
            end
            turtle.back()

            if( sapSlot ~= nil ) then
                turtle.select( sapSlot )
                turtle.place()
            end
        end

    end
end


Main()