mine.lua

local length = 160
local width = 160
local mining = true
local l = 0
local w = 0
local clean = 32
local clean_count = 0
local turn = 1--1=>right,-1=>left

--fuel is first slot
--then important blocks
--then inventory
--overlapping is undefined (except fuel slot being important)
--gaps are undefined (except btwn important_end and inven_start, blocks there will be collected but only up to one stack)
local fuel = 1
local important_start = 1
local important_end = 3
local inven_start = important_end+1
local inven_end = 16

function refuel()--returns false if it ran out of coal and has low energy
    if turtle.getFuelLevel() < 3 then
        if turtle.getItemCount(1) <= 1 then
            return false
        else
            print("Refueling")
            turtle.refuel(1)
            print("new fuel level: "..turtle.getFuelLevel())
            print("remaing fuel: "..turtle.getItemCount(1))
            return true
        end
    end
    return true
end

function dig_forward()--returns if it can dig and move forward
    while turtle.detect() do
        turtle.dig()
    end
    local rtn = turtle.forward()
    while turtle.detectUp() do
        turtle.digUp()
    end
    while turtle.detectDown() do
        turtle.digDown()
    end
    return rtn
end

function clean_inventory()--returns false if inventory is full of important blocks
    local full = 0
    local selected = turtle.getSelectedSlot()
    for i=inven_start,inven_end do
        turtle.select(i)
        drop = true
        for i=important_start,important_end do
            if turtle.compareTo(i) then
                drop = false
            end
        end
        if drop then
            turtle.drop()
        end
        if turtle.getItemSpace(i) == 0 then
            full = full+1
        end
    end
    turtle.select(selected)

    if full >= inven_end - inven_start + 1 then
        return false
    else
        return true
    end
end

while mining do
    dig_forward()
    l = l+1
    if l>length then
        if turn > 0 then
            turtle.turnRight()
            dig_forward()
            turtle.turnRight()
        else
           turtle.turnLeft()
           dig_forward()
           turtle.turnLeft()
        end
        turn = turn*-1
        l = 0
        w = w+1
        if w > width then
            print("End or route")
            w = 0
            mining = false
        end
    end

    if clean_count >= clean then
        if not clean_inventory() then
            print("Inventory full")
            mining = false
        end
        clean_count = 0
    else
        clean_count = clean_count + 1
    end

    if not refuel() then
        print("out of fuel")
        mining = false
    end
end