pokehole3.0

--pokeHole by Hypno

--***IMPORTANT READ THIS***
--Fuel in slot 1 (coal/charcoal works great!)
--Torches in slot 2
--Ladders in slot 3 (no ladders needed if depth set to 0 or 1)

--set depth to how far below you want the turtle to start the pokeHole mine
--set length to how long you want the mine.  Remember to stay within loaded chunks or have world anchors!
--***IMPORTANT READ THIS***

local depth = 0
local length = 100
--                 pokehole length
local fuelNeeded = ((length/3)*20) + (length*2) + (depth*2)
local function checkFuel()
    while (turtle.getFuelLevel() < fuelNeeded) do
      turtle.select(1)
      if (turtle.getItemCount(1) == 0) then
        print("Not enough fuel.")
        return false
      end
      turtle.refuel(1)
    end
    return true
end

local function forwardYo()
    while not turtle.forward() do
        turtle.dig()
    end
end

local function checkTorches()
    if (length / 10 > turtle.getItemCount(2)) then
      print("Not enough torchs.")
      return false
    end
    return true
end
local function checkLadders()
    if (turtle.getItemCount(3) < depth) then
      print("Not enough ladders.")
      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 digPokeHoles()
    local i = 0
    turtle.turnRight()
    for i=0, 4 do
        dig()
        forwardYo()
    end
    turtle.turnLeft()
    turtle.turnLeft()
    for i=0, 4 do
        forwardYo()
    end
    for i=0, 4 do
        dig()
        forwardYo)
    end
    turtle.turnRight()
    turtle.turnRight()
    for i=0, 4 do
        forwardYo()
    end
    turtle.turnLeft()
end
local function digToDepth()
    local ladder = false
    if (depth > 1) then
        ladder = true
    end
    if (ladder) then
        turtle.turnRight()
        turtle.turnRight()
    end
    local i = 0
    while (i < depth) do
        turtle.digDown()
        turtle.down()
        if (ladder) then
            turtle.dig()
            turtle.select(3)
            turtle.place()
        end
        i = i + 1
    end
    turtle.digDown()
    if (ladder) then
        turtle.down()
        turtle.dig()
        turtle.select(3)
        turtle.place()
        turtle.up()
        turtle.turnRight()
        turtle.turnRight()
    end
    placeTorch()
    digPokeHoles()
end
local function digTunnel()
    local i = 0
    local j = 0
    local k = 0
    while (i < length) do
        dig()
        forwardYo()
        turtle.digDown()
        j = j + 1
        if (j == 10) then
            placeTorch()
            j = 0
        end
        k = k + 1
        if (k % 4 == 0) then
            digPokeHoles()
            k = 0
        end
        i = i + 1
    end
end
local function turnAround()
    turtle.turnRight()
    turtle.turnRight()
end
local function moveToTunnelStart()
    local i = 0
    for i=1,length do
      forwardYo()
    end
end
local function moveToStartDepth()
    local i = 0
    for i=1,depth do
      turtle.up()
    end
end
local function placeSafetyBlock()
    turtle.select(4)
    turtle.placeDown()
    print("Complete.")
end

--If not enough fuel, torches or ladders don't do anything.
if checkFuel() and checkTorches() and checkLadders() then
    digToDepth()
    digTunnel()
    placeTorch()
    turnAround()
    moveToTunnelStart()
    turnAround()
    moveToStartDepth()
    placeSafetyBlock()
end