SingleTunnel

--SingleTunnel by Lothendas

--****IMPORTANT READ THIS***
-- 1. Fuel in slot 1 (Coal/Charcoal/LavaBuckets)
-- 2. Torces in slot 2

local args = { ... }
-- Distance Variable
local distance = tonumber(args[1])
-- Fuel needed Variable
local fuelNeeded = distance * 2
-- Torches needed variable
local torchNeeded = distance / 10

-- Check Amount of Fuel Function
local function checkFuel()
    while (turtle.getFuelLevel() < fuelNeeded) do
        turtle.select(1)
        if (turtle.getItemCount(1) == 0) then
            print("Not enough fuel to complete operation...")
            return false
        end
        turtle.refuel(1)
    end
    return true
end

-- Check Amount of Torches Function
local function checkTorches()
    if (turtle.getItemCount(2) < torchNeeded) then
        print ("Not enough torches to complete operation...")
        return false
    end
    return true
end

local function placeTorch()
    turtle.select(2)
    turtle.placeDown()
end

local function dig()
    while (turtle.detect()) do
        turtle.dig()
        sleep(0.5)
    end
end

local function turnAround()
    turtle.turnLeft()
    turtle.turnLeft()
end

local function toStart()
    local i = 0
    for i = 1, distance do
        turtle.forward()
    end
end

local function digTunnel()
    print("Initializing digging...")
    local torch = 0
    local i = 0
    while (i < distance) do
        dig()
        turtle.forward()
        turtle.digDown()
        torch = torch + 1
        if (torch == 10) then
            placeTorch()
            turtle.turnLeft()
            dig()
            turnAround()
            dig()
            turtle.turnLeft()
            torch = 0
        end
        i = i + 1
    end
    turnAround()
    toStart()
    print("Tunnel digging complete...")
end

if checkFuel() and checkTorches() then
    digTunnel()
end