Tunnel3x3B

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

local depth = length
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 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 tryDigDown()
        while turtle.detectDown() do
                if turtle.digDown() then
                        collect()
                        sleep(0.5)
                else
                        return false
                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 tryBack()
    refuel()
    while not turtle.back() 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

print( " Fackeln in Slot 15 ")
print( "Tunnelling..." )
j=0
for n=1,length do
    pro = 100/length*n
    turtle.placeDown()
    tryDigUp()
    turtle.turnLeft()
    tryDig()
        for u=1,3 do
        tryUp()
        tryDig()
        end
    turtle.turnRight()
    turtle.turnRight()
        for d=1,3 do
        tryDig()
        tryDown()
        end
    tryDig()

        j = j+1
        if j == 5 then
        turtle.turnRight()
        turtle.select(15)
        turtle.place()
        turtle.turnLeft()
        j = 0
        end
    print(" Es sind bereits "..pro.." Prozent abgeschlossen")
    turtle.turnLeft()
        if n<length then
                tryDig()
                if not tryForward() then
                        print( "Aborting Tunnel." )
                        break
                end
        else
        turtle.up()
        turtle.turnLeft()
        turtle.turnLeft()
        for n=1,length do
            tryForward()
        end
                print( "Tunnel complete." )
        end

end

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