Livify

map = {}
x = 1
y = 1
direction = "+y"
reversing = false

filepath = arg[1]
if filepath == nil then filepath = "map" end

function FindStuff()
  if CheckSlot() then
    return true
  end

  for i = 1, 16, 1 do
    turtle.select(i)
    if CheckSlot() then
      return true
    end
  end

  return false
end

function CheckSlot()
  if turtle.getItemCount() > 0 then
    item = turtle.getItemDetail()
    if item.name == "minecraft:stone" or string.find(item.name, "log") ~= nil then
      return true
    end
  end
  return false
end

function ReadMap()
  local file = fs.open(filepath, "r")
  if file == nil then
    shell.run("MakeMap")
    reversing = true
    file = fs.open(filepath, "r")
  end
  local line = file.readLine()
  local bounds = line:gmatch("%S+")
  local maxX = tonumber(bounds())
  local maxY = tonumber(bounds())
  local i = 1
  local j = maxY

  while j >= 1 do
    line = file.readLine()
    if line == nil then
      break
    end

    i = 1
    for word in line:gmatch("%S+") do
      map[i .. " " .. j] = word
      i = i + 1
    end
    j = j - 1
  end
  file.close()
end

function ReadLog()
  local log = fs.open("log", "r")
  if log == nil then
    UpdateLog()
  else
    x = tonumber(log.readLine())
    y = tonumber(log.readLine())
    direction = log.readLine()
       reversing = log.readLine() == "true"
    log.close()
  end
end

function UpdateLog()
  local log = fs.open("log", "w")
  log.writeLine(x)
  log.writeLine(y)
  log.writeLine(direction)
  log.writeLine(reversing)
  log.close()
end

function Checkblock()
  local success, block = turtle.inspectDown()
  if success then
    if block.name == "botania:livingrock" or block.name == "botania:livingwood" then
      return "living"
    elseif block.name == "minecraft:stone" or string.find(block.name, "log") ~= nil then
      return "block"
    elseif block.name == "botania:pure_daisy" then
      return "daisy"
    end
  end
  return "air"
end

function Move(d)
  if d == "-E" or d == "+E" then
    reversing = true
    UpdateLog()
    ReturnHome()
       return
  elseif d == "+S" then
    d = "+y"
    reversing = false
  end

  FaceDirection(d)
  if direction == "+x" then
    x = x + 1
  elseif direction == "-x" then
    x = x - 1
  elseif direction == "+y" then
    y = y + 1
  elseif direction == "-y" then
    y = y - 1
  end
  UpdateLog()
  turtle.forward()
end

function FaceDirection(d)
  if direction == d then return end
  if direction == "+y" then
    if d == "+x" then
      turtle.turnRight()
    elseif d == "-x" then
      turtle.turnLeft()
    elseif d == "-y" then
      turtle.turnRight()
      turtle.turnRight()
    end
  elseif direction == "+x" then
    if d == "+y" then
      turtle.turnLeft()
    elseif d == "-x" then
      turtle.turnRight()
      turtle.turnRight()
    elseif d == "-y" then
      turtle.turnRight()
    end
  elseif direction == "-x" then
    if d == "+y" then
      turtle.turnRight()
    elseif d == "+x" then
      turtle.turnRight()
      turtle.turnRight()
    elseif d == "-y" then
      turtle.turnLeft()
    end
  elseif direction == "-y" then
    if d == "+y" then
      turtle.turnRight()
      turtle.turnRight()
    elseif d == "+x" then
      turtle.turnLeft()
    elseif d == "-x" then
      turtle.turnRight()
    end
  end
  direction = d
  UpdateLog()
end

function ReturnHome()
  while x ~= 1 or y ~= 1 do
    if x > 1 then
         Move("-x")
       elseif y > 1 then
         Move("-y")
       end
  end
  reversing = false
  UpdateLog()
end

ReadLog()
ReadMap()
if reversing then ReturnHome() end
while FindStuff() do
  local block = Checkblock()
  if block == "living" then
    turtle.digDown()
    turtle.placeDown()
  elseif block == "block" then
    repeat
      sleep(1)
    until Checkblock() == "living"
    turtle.digDown()
    turtle.placeDown()
  elseif block == "air" then
    turtle.placeDown()
  end
  Move(map[x .. " " .. y])
end

print("Done")