Woodcutting bot for Turtle in Minecraft

woodcut.lua

local SLOT_COUNT = 16
local d = "north"

function getItemIndex(itemName)
    for slot = 1, SLOT_COUNT, 1 do
        local item = turtle.getItemDetail(slot)
        if(item ~= nil) then
            if(string.match(item.name, itemName)) then
                return slot
            end
        end
    end
end

function checkFuel()
    if(turtle.getFuelLevel() < 50) then
        coalIndex = getItemIndex("coal")
        if (coalIndex == nil) then
            print("No fuel detected, please supply more fuel")
            return false
        else 
            turtle.refuel()
            print("Refueled")
            return true         
        end
    end
    return true
end

function woodCutUp()
    print("Cutting tree...")
    i = 0
    while turtle.detect() do
        turtle.dig()
        plant()
        turtle.digUp()
        turtle.up()
        sleep(0.5)
        i = i + 1
    end
    woodCutDown(i)
    return true
end

function woodCutDown(height)
    print("Cutting second half...")
    turtle.turnLeft()
    turtle.dig()
    turtle.forward()
    turtle.turnRight()
    turtle.dig()
    turtle.digDown()
    for v = 1,height,1 do
        turtle.down()
        turtle.dig()
        turtle.digDown()
        plant()
        sleep(0.5)
    end
    return true
end

function plant()
    index = getItemIndex("sapling")
    if(index ~= nil) then
        turtle.select(index)
        if turtle.place() then
            print("Sapling planted...")
        end
        return true
    end
end

function returnToGround()
    print("Returning to bottom...")
    while (turtle.detect() == false) do
        turtle.down()
    end
    
end

function suck()
    print("Attempting to collect all saplings around...")
    turtle.suck()
    turtle.turnLeft()
    turtle.suck()
    turtle.turnLeft()
    turtle.suck()
    turtle.turnLeft()
    turtle.suck()
    turtle.turnLeft()
    turtle.suckDown()
end

function flipDirection( ... )
    turtle.turnLeft()
    turtle.turnLeft()
end

function depositWood()
    print("Turning around...")
    flipDirection()
    print("Depositing")
    for slot = 1, SLOT_COUNT, 1 do
        local item = turtle.getItemDetail(slot)
        if(item ~= nil) then
            if not string.match(item["name"], "sapling") and not string.match(item["name"], "coal") then
                turtle.select(slot)
                turtle.drop()
            end
        end
    end
    print("Deposited. Turning around...")
    flipDirection()
end
function start()
    while true do
        if(not checkFuel()) then
            print("Turtle is out of fuel, Powering Down...")
            return
        end
        turtle.suckDown()
        if turtle.inspect() ~= nil then
            x, table = turtle.inspect()
            if x == true then
                tag = table['tags']
                name = table['name']
                if tag['minecraft:logs'] == true then
                    print("Tree detected...")
                    woodCutUp()
                elseif string.match(name,"dirt") or string.match(name,"grass")  then
                    print("No sapling detected, planting...")
                    turtle.up()
                    plant()
                else
                    sleep(10)
                end   
            else
                returnToGround()
                suck()
                depositWood()
                print("Waiting for tree to grow...")
            end
        end    
    end
end
print("Bottom reached..")
start()