ComputerCraft mine

function clearInv()
    --drop all non essential items [cobble, diorite, andesite ect..]
    for n=1,15 do
        p = turtle.getItemDetail(n)
        if p ~= nil then
            if p.name == "minecraft:cobblestone" or p.name == "minecraft:stone" then
                turtle.select(n)
                turtle.dropDown()
            end
        end
    end
    turtle.select(16)
end

function miniTunnel(l, b, t)
    for n=1,l do
        if b then
            while turtle.detect() do
                turtle.dig()
                os.sleep(0.5)
            end
        end
        if n % 8 == 3 and t then
            turtle.select(16)
            turtle.placeDown()
            clearInv()
        end
        turtle.forward()
        if b then
            --mine block above and below turtle [height of 3]
            while turtle.detectUp() or turtle.detectDown() do
                turtle.digUp()
                turtle.digDown()
            end
        end
    end
end

function checkSpace(m)
    clearInv()
    storage = 0
    for n=1,15 do
        p = turtle.getItemDetail(n)
        if p ~= nil then
            storage = storage + 1
        end
    end

    if storage >= 10 then
        --move back to start to drop off items if not at end
        if length ~= 1 then
            turtle.turnLeft()
            turtle.turnLeft()
            for n=1,m do
                turtle.forward()
            end
            for n=1,15 do
                turtle.select(n)
                turtle.dropDown()
            end
            turtle.turnLeft()
            turtle.turnLeft()
            for n=1,m do
                turtle.forward()
            end
        end
    end
end

function Tunnel(l, st)
    local length = tonumber(l)
    local tunnelLength = length
    local sideTunnels = tonumber(st) + 1
    local moved = 1

    while (turtle.detect() and length >= 1) or length >= 1 do
        --main tunnel section
        miniTunnel(1,true, false)
        turtle.turnLeft()
        miniTunnel(1,true, false)
        turtle.turnRight()
        turtle.turnRight()
        miniTunnel(1, false, false)
        miniTunnel(1, true, false)
        turtle.turnLeft()
        turtle.turnLeft()
        miniTunnel(1, false, false)
        turtle.turnRight()
        --check if torch needed
        if length % 3 == 1 then
            turtle.turnLeft()
            miniTunnel(sideTunnels, true, true)
            turtle.turnRight()
            turtle.turnRight()
            miniTunnel(sideTunnels, false, false)
            turtle.turnLeft()
            checkSpace(moved)
            turtle.turnRight()
            miniTunnel(sideTunnels, true, true)
            turtle.turnLeft()
            turtle.turnLeft()
            miniTunnel(sideTunnels, false, false)
            turtle.turnRight()
            checkSpace(moved)
        end
        length = length - 1
        moved = moved + 1
    end

    returnHome(tunnelLength)
end

function returnHome(l)
    clearInv()
    turtle.turnRight()
    turtle.turnRight()
    for n=1,l do
        turtle.forward()
    end
    for n=1,15 do
        turtle.select(n)
        turtle.dropDown()
    end
end

local tArgs = { ... }
local size = tonumber( tArgs[1] )
if #tArgs ~= 2 then
    print( "Usage: mine <length> <strip's length>" )
    return
end

local size = tonumber( tArgs[1] )
if size < 1 then
    print( "Mine length must be positive" )
    return
end

size = tonumber( tArgs[2] )
if size < 1 then
    print( "Strip length must be positive" )
    return
end

Tunnel(tArgs[1], tArgs[2])