Tunnel3Modified

local tArgs = { ... }
--if #tArgs ~= 1 then
--  print( "Usage: tunnel <length>" )
--  return
--end

-- Mine in a quarry pattern until we hit something we can't dig
local firstItem,lastItem = 2,15
local length = tonumber( tArgs[1] )
--if length < 1 then
--  print( "Tunnel length must be positive" )
--  return
--end

local depth = 0
local collected = 0

local function collect()
    collected = collected + 1
    if math.fmod(collected, 25) == 0 then
        print( "Mined "..collected.." items." )
    end
end

local function tryDig()
    while turtle.detect() do
        if turtle.dig() then
            collect()
            sleep(0.5)
        else
            return false
        end
    end
    return true
end

local function tryDigUp()
    while turtle.detectUp() do
        if turtle.digUp() then
            collect()
            sleep(0.5)
        else
            return false
        end
    end
    return true
end

local function tryDigDown()
    while turtle.detectDown() do
        if turtle.digDown() then
            collect()
            sleep(0.5)
        else
            return false
        end
    end
    return true
end

local function refuel()
    local fuelLevel = turtle.getFuelLevel()
    if fuelLevel == "unlimited" or fuelLevel > 0 then
        return
    end

    local function tryRefuel()
        for n=1,16 do
            if turtle.getItemCount(n) > 0 then
                turtle.select(n)
                if turtle.refuel(1) then
                    turtle.select(1)
                    return true
                end
            end
        end
        turtle.select(1)
        return false
    end

    if not tryRefuel() then
        print( "Add more fuel to continue." )
        while not tryRefuel() do
            sleep(1)
        end
        print( "Resuming Tunnel." )
    end
end

local function tryUp()
    refuel()
    while not turtle.up() do
        if turtle.detectUp() then
            if not tryDigUp() then
                return false
            end
        elseif turtle.attackUp() then
            collect()
        else
            sleep( 0.5 )
        end
    end
    return true
end

local function tryDown()
    refuel()
    while not turtle.down() do
        if turtle.detectDown() then
            if not tryDigDown() then
                return false
            end
        elseif turtle.attackDown() then
            collect()
        else
            sleep( 0.5 )
        end
    end
    return true
end

local function tryForward()
    refuel()
    while not turtle.forward() do
        if turtle.detect() then
            if not tryDig() then
                return false
            end
        elseif turtle.attack() then
            collect()
        else
            sleep( 0.5 )
        end
    end
    return true
end
local function checkFull()
    return (turtle.getItemCount(16) > 0)
end

--This will drop everything into a chest
function putAwayInventory()
    while turtle.detectUp() do
        turtle.digUp()
    end
    turtle.select(1)
    while turtle.placeUp() == false do
        turtle.digUp()
    end
    for i = firstItem, lastItem do
        turtle.select(i)
        turtle.dropUp()
    end
    turtle.select(1)
    turtle.digUp()
end
print( "Tunnelling..." )
while 1 do
    if checkFull() then
        putAwayInventory()
    end
    tryDigUp()
    turtle.turnLeft()
    tryDig()
    tryUp()
    tryDig()
    tryDigUp()
    tryUp()
    tryDig()
    turtle.turnRight()
    turtle.turnRight()
    tryDig()
    tryDown()
    tryDig()
    tryDown()
    tryDig()
    turtle.turnLeft()
    tryDig()
    if not tryForward() then
        print( "Aborting Tunnel." )
        break
    end
end


print( "Tunnel complete." )
print( "Mined "..collected.." items total." )