Turtle Miner 2

function stripDig()
  for i = 1, 3 do
    turtle.dig()
    if not turtle.forward() then
      while true do
        turtle.dig()
        if turtle.forward() then break end
      end
    end
    turtle.digDown()
  end
  stripIterate(true)
end

function stripIterate(bool)
  if bool then
    turtle.turnLeft()
  end
  for i = 1, 5 do
    turtle.dig()
    if i < 5 then
      if not turtle.forward() then
        while true do
          turtle.dig()
          if turtle.forward() then break end
        end
      end
    else
      turtle.turnRight()
      turtle.turnRight()
      for j = 1, i-1 do
        if not turtle.forward() then
          while true do
            turtle.dig()
            if turtle.forward() then break end
          end
        end
      end
      if bool then
        stripIterate(false)
      else
        turtle.turnRight()
      end
    end
  end
end

function strip()
  print("How many iterations to dig the tunnel for?")
  -- 1 iteration is 3 blocks long including the block where the turtle is placed
  -- each iteration has a branch on both sides at the 3rd block at head height
  -- Note: The turtle must be placed on the ground, and will not dig a branch on the starting block
  -- Note: Turtle must have torches in selected slot
  local length = tonumber(read())
  turtle.digUp()
  turtle.up()
  for i = 0, length-1 do
    if i % 3 == 0 or i == length then
      turtle.placeDown()
    end
    stripDig()
  end
  turtle.turnRight()
  turtle.turnRight()
  for i = 0, (length*3)-2 do
    turtle.forward()
  end
  turtle.down()
  turtle.digDown()
  turtle.down()
  print("Finished strip mining")
end

function stairs()
  print("Enter current Y coordinate value: ")
  top = tonumber(read())
  print("Enter desired Y value above bedrock (0): ")
  bottom = tonumber(read())
  if bottom > top or top > 255 or bottom < 0 then
    term.clear()
    term.setCursorPos(1, 1)
    print("Warning: Incorrect input. Please try again")
    stairs()
  else
    function moveForward()
      if not turtle.forward() then
        while true do
          turtle.dig()
          if turtle.forward() then break end
        end
      end
    end
    term.clear()
    term.setCursorPos(1, 1)
    length = top - bottom
    length = math.ceil(length/2) * 2
    print("Digging from y="..top.." to y="..top-length)
    turtle.digDown()
    turtle.down()
    for i = 1, length/2 do
      if not turtle.detectDown() then
        turtle.select(2)
        turtle.placeDown();
      end
      moveForward()
      turtle.digDown()
      moveForward()
      turtle.dig()
      turtle.digDown()
      turtle.digUp()
      turtle.down()
      turtle.dig()
      turtle.digDown()
      turtle.down()
      turtle.turnRight()
      turtle.turnRight()
      if not turtle.detect() then
        turtle.select(2)
        turtle.place();
      end
      turtle.turnRight()
      turtle.turnRight()
      print(math.floor((100 / (length / (i * 2))) * 100 + 0.5) / 100 .. "%")
      if i-1 % 3 == 0 then
        turtle.select(1)
        if not turtle.placeUp() then
          while true do
            turtle.digUp()
            if turtle.placeUp() then break end
          end
        end
      end
    end
  end
  turtle.dig()
  print("Finished digging stairs")
end

programs = {"stairs", "strip", "exit"}

function getProg()
  print("Programs: ")
  for k, v in pairs(programs) do
    print(k.." - "..v)
  end
  prog = read()
  if prog == programs[1] and stairs ~= nil then
    term.clear()
    term.setCursorPos(1, 1)
    stairs()
  elseif prog == programs[2] and strip ~= nil then
    term.clear()
    term.setCursorPos(1, 1)
    strip()
  elseif prog == programs[#programs] then
    print("Goodbye")
    term.clear()
    term.setCursorPos(1, 1)
  else
    term.clear()
    term.setCursorPos(1, 1)
    print("Invalid program!")
    getProg()
  end
end

function start()
  term.clear()
    term.setCursorPos(1, 1)
  print("Enter password")
  pass = read()
    term.clear()
    term.setCursorPos(1, 1)
  if pass == "leo123" then
    print("Welcome. Type the name of a program to begin.")
    getProg()
  else
    print("Incorrect password!")
    start()
  end
end

start()