tunnelcustom.lua

local tArgs = { ... }
if #tArgs ~= 2 then
    print( "Usage: tunnel <length> <diameter>" )
    return
end

-- Mine in a quarry pattern until we hit something we can't dig
local length = tonumber( tArgs[1] )
local diameter = tonumber(tArgs[2])
if length < 1 then
    print( "Tunnel length must be positive" )
    return
end
if diameter < 1 then
    print( "Tunnel diameter must be positive" )
    return
end
if diameter % 2 == 0 then
    print("Diameter must be uneven")
    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
            os.pullEvent( "turtle_inventory" )
        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

print( "Tunnelling..." )

local function dig_forward()
    for w=1,((diameter-1)/2) - 1 do
        print("Going forward 1")
        tryDig()
        turtle.forward()
        -- tryForward()
    end
    tryDig()

    for w=1,((diameter-1)/2) - 1 do
        print("Going back 1")
        turtle.back()
    end
end

local function dig_column(direction)
    for h=1,diameter-1 do
        dig_forward()
        if direction == "up" then
            print("Going up")
            tryUp()
        else
            print("Going down")
            tryDown()
        end
    end
    dig_forward()
end

local function do_iteration(n)
    print("Diameter is", diameter, "len is", length)
    if diameter > 1 then
        print("Diam is bigger than 1")
        -- Minimum diameter = 3

        dig_forward()
        turtle.turnLeft()

        dig_column("up")

        turtle.turnRight()
        turtle.turnRight()

        dig_column("down")

        dig_forward()
        turtle.turnLeft()
    end

    if n<length then
        tryDig()
        if not tryForward() then
            print( "Aborting Tunnel." )
            return false
        end
    else
        print( "Tunnel complete." )
    end
    return true
end

for n=1,length do
    if not do_iteration(n) then
        break
    end
end

--[[
print( "Returning to start..." )

-- Return to where we started
turtle.turnLeft()
turtle.turnLeft()
while depth > 0 do
    if turtle.forward() then
        depth = depth - 1
    else
        turtle.dig()
    end
end
turtle.turnRight()
turtle.turnRight()
]]

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