branch2

local tArgs = {...}
local length = tArgs[1]
local numTunnels = tArgs[2]
local inv = true
local checkTorch = 0
local height = 0
local fullInvNum = 0

function checkOreId(name)
    return name == 'minecraft:coal_ore'
        or name == 'minecraft:iron_ore'
        or name == 'minecraft:gold_ore'
        or name == 'minecraft:diamond_ore'
        or name == 'minecraft:lapis_ore'
        or name == 'minecraft:redstone_ore'
        or name == 'minecraft:lit_redstone_ore'
end

function checkOre(func)
    local success, data = func()
 if not success then return false end
 return checkOreId(data.name)
end

function isOre()
 return checkOre(turtle.inspect)
end

function isOreUp()
    return checkOre(turtle.inspectUp)
end

function isOreDown()
    return checkOre(turtle.inspectDown)
end

function repeatSuccess(func)
    while func() do end
end

function dig()
    repeatSuccess(turtle.dig)
end

function digUp()
    repeatSuccess(turtle.digUp)
end

function digDown()
    repeatSuccess(turtle.digDown)
end

isUp = false

function searchAround()
 print('searching for ores')
 turtle.select(1)
    if isOre() then
        dig()
        turtle.forward()
        searchAround()
        turtle.back()
  turtle.place()
    elseif isOreDown() then
        digDown()
        turtle.down()
        searchAround()
        turtle.up()
        turtle.placeDown()
    elseif isOreUp() then
        digUp()
        turtle.up()
        searchAround()
        turtle.down()
        turtle.placeUp()
    end

    turtle.turnLeft()
    if isOre() then
        dig()
        turtle.forward()
        searchAround()
        turtle.back()
        turtle.place()
    end

    turtle.turnRight()
    turtle.turnRight()
    if isOre() then
        dig()
        turtle.forward()
        searchAround()
        turtle.back()
        turtle.place()
    end
    turtle.turnLeft()
end

-- The basic function to move forward and dig
function tunnel()
  -- These used throughout to erase screen
  term.clear()
  term.setCursorPos(1,1)
  print("Mining...")
  for i=1,length do
    fuel()
    dig()
    turtle.forward()
    digUp()
    isUp = false
    searchAround()
    turtle.up()
    isUp = true
    searchAround()
    turtle.down()
    torch()
  end
end

-- The function to turn around and go the other direction down the tunnel, also clears side tunnels
function turnAround()
  term.clear()
  term.setCursorPos(1,1)
  print("Turning around...")
  for k = 1,6 do
    fuel()
    dig()
    turtle.forward()
    digUp()
    isUp = false
    searchAround()
    turtle.up()
    isUp = true
    searchAround()
    turtle.down()
    torch()
  end

  checkInv()

  while turtle.back() == false do
    turtle.turnRight()
    turtle.turnRight()
    dig()
    for i = 1,3 do
      turtle.forward()
      dig()
    end
    turtle.turnRight()
    turtle.turnRight()
    for i = 1,3 do
      turtle.back()
    end
  end
  turtle.back()
  turtle.back()
end

-- Clears the specified item from the inventory, most likely cobble, also stops on full inv
function checkInv()
  term.clear()
  term.setCursorPos(1,1)
  print("Trashing...")
  for y = 2,16 do
    turtle.select(y)
    if turtle.compareTo(1) then
      turtle.drop()
    end
  end
end

function fullInv()
  checkInv()
  -- To not spill items everywhere, some credit to link0153 :)
  for i = 1,16 do
    if turtle.getItemCount(i) > 0 then
      fullInvNum = fullInvNum + 1
    end
  end
  while fullInvNum == 16 do
    term.clear()
    term.setCursorPos(1,1)
    print("Inventory full, please clear.")
    sleep(5)
    for i = 1,16 do
      if turtle.getItemCount(i) == 0 then
        fullInvNum = 0
      end
    end
  end
  fullInvNum = 0
  term.clear()
  term.setCursorPos(1,1)
  print("Mining...")
end

-- Checks how long since the last torch, then decides to place one above or not
function torch()
  -- Checks if low on torches
  if turtle.getItemCount(16) < 5 then
    term.clear()
    term.setCursorPos(1,1)
    print("Waiting for torches...place in bottom right.")
    while turtle.getItemCount(16) < 5 do
      sleep(2)
    end
  end
  term.clear()
  term.setCursorPos(1,1)
  print("Mining...")
  if checkTorch == 8 then
    fuel()
    turtle.select(16)
    turtle.up()
    digUp()
    -- This if and loop will bring the turtle back down from the placed torch
    if turtle.placeUp() or turtle.getItemCount(16) == 0 then
        for i = 0,height do
          fuel()
          turtle.down()
        end
        turtle.select(1)
        checkTorch = 0
        height = 0
    else
        height = height + 1
        torch()
    end
  -- If it's too soon, dont place a torch
  else
    checkTorch = checkTorch + 1
  end
end

-- Checks the fuel level, asks for more if necessary
function fuel()
  if turtle.getFuelLevel() < 50 then
    print ("Wating for fuel...place in bottom left.")
    while turtle.getFuelLevel() < 50 do
      turtle.select(13)
      turtle.refuel()
      sleep(2)
    end
  end
  term.clear()
  term.setCursorPos(1,1)
  print("Mining...")
  turtle.select(1)
end

-- This function is a one time startup function, makes sure the turtle has the necessary materials
function begin()
  turtle.select(1)
  -- Checks for trash item
  if turtle.getItemCount(1) == 0 then
    print("Please place an item to trash in the top left.")
    while turtle.getItemCount(1) == 0 do
      sleep(1)
    end
    term.clear()
    term.setCursorPos(1,1)
    begin()
  -- Confirms trashed item
  else
    print("The item in the top left will be trashed...confirm?")
    os.pullEvent("key")
  end
  term.clear()
  term.setCursorPos(1,1)
end

-- From here is the main code

-- Checks for correct args
if not (tArgs[1] == nil or tArgs[2] == nil) then
  begin()
  -- Loops for the specified # of tunnels, one tunnel being up and back
  for j = 1,numTunnels do
    tunnel()
    fullInv()
    turtle.turnLeft()
    turnAround()
    fullInv()
    turtle.turnLeft()
    tunnel()
    fullInv()
    turtle.turnRight()
    turnAround()
    fullInv()
    turtle.turnRight()
  end
  -- Resets the screen and displays a confirmation of finishing
  term.clear()
  term.setCursorPos(1,1)
  print("Done!")
else
  term.clear()
  term.setCursorPos(1,1)
  print("Not enough arguments, should be used 'branch [length] [number of tunnels]'")
end