Stop displaying new game if a save file exists.

#==============================================================================
# ■ Meow Face Single Save File System
#------------------------------------------------------------------------------
# Change the game save/load system to work on one save file only.
#==============================================================================
# How to Use:
# [1] Paste this below Material and above Main
# [2] Set your preferences save file name in the script's SETTINGS AREA
#==============================================================================
module MeowSaveFileManager #DO NOT REMOVE!!
#==============================================================================
# Settings Area
#==============================================================================
  #---------------#
  # Save File Name  #
  #---------------#
  FILE_NAME = "meow.dat" #save file name and extension
  #--------------#
  # Saving a Game #
  #--------------#
  SAVE_MESSAGE = "Now Saving..." #save message to display
  SAVE_ICON = 286 #(icon id) set which icon to be displayed with the save message
  #----------------------#
  # Restarting A New Game  #
  #----------------------#
  CONFIRM_MESSAGE = "Are you sure to restart a new game?" #Confirmation message
  OVERWRITE_WARNING = "Warning!! You will lost your current progress!" #Warning Message
  YES = "I'm Sure!"
  NO = "No Way!"
#==============================================================================
# End of Settings Area
# Edit anything past this line at your own risk!
#==============================================================================
end
module DataManager
  def self.save_file_exists? #overwrite
    !Dir.glob(MeowSaveFileManager::FILE_NAME).empty?
  end
  def self.savefile_max #overwrite
    return 1
  end
  def self.make_filename(index) #overwrite
    sprintf(MeowSaveFileManager::FILE_NAME, index + 1)
  end
end
class Game_Map
  attr_accessor :sm_show
  alias meow_setup_sm setup
  def setup(map_id) #alias
    meow_setup_sm(map_id)
    @sm_show = false
  end
  def show_sm
    SceneManager.scene.show_save_message
    @sm_show = false
  end
  alias meow_update_sm update
  def update(main = false) #alias
    meow_update_sm(main)
    show_sm if @sm_show
  end
end
class Game_Interpreter
  def command_352 #overwrite
    return if $game_party.in_battle
    if DataManager.save_game(0)
      Sound.play_save
      $game_map.sm_show = true
    else
      Sound.play_buzzer
    end
  end
end
class Window_SaveMessage < Window_Base
  def initialize
    super(Graphics.width - window_width, Graphics.height - fitting_height(1), window_width, fitting_height(1))
    self.opacity = 0
    self.contents_opacity = 0
    @show_count = 0
    refresh
  end
  def window_width
    return 240
  end
  def update
    super
    if @show_count > 0 && $game_map.name_display
      update_fadein
      @show_count -= 1
    else
      update_fadeout
    end
  end
  def update_fadein
    self.contents_opacity += 16
  end
  def update_fadeout
    self.contents_opacity -= 16
  end
  def open
    refresh
    @show_count = 150
    self.contents_opacity = 0
    self
  end
  def close
    @show_count = 0
    self
  end
  def refresh
    contents.clear
    draw_background(contents.rect)
    draw_icon(MeowSaveFileManager::SAVE_ICON, contents.rect.width-24, 0)
    draw_icon(MeowSaveFileManager::SAVE_ICON, contents.rect.x, 0)
    draw_text(contents.rect.x,contents.rect.y,contents.rect.width, fitting_height(0), MeowSaveFileManager::SAVE_MESSAGE, 1)
  end
  def draw_background(rect)
    temp_rect = rect.clone
    temp_rect.width /= 2
    contents.gradient_fill_rect(temp_rect, back_color2, back_color1)
    temp_rect.x = temp_rect.width
    contents.gradient_fill_rect(temp_rect, back_color1, back_color2)
  end
  def back_color1
    Color.new(0, 0, 0, 192)
  end
  def back_color2
    Color.new(0, 0, 0, 0)
  end
end
class Window_TitleCommand < Window_Command
  def make_command_list #overwrite
    add_command(Vocab::new_game, :new_game)
    add_command(Vocab::continue, :continue, continue_enabled) if DataManager.save_file_exists?
    add_command(Vocab::shutdown, :shutdown)
  end
end
class Window_StartNewAsk < Window_Base
  def initialize
    super((Graphics.width - window_width)/2, (Graphics.height - fitting_height(5))/2, window_width, fitting_height(5))
    create_message
  end
  def window_width
    return Graphics.width - 40
  end
  def create_message
    draw_text(contents.rect.x,contents.rect.y,contents.rect.width, fitting_height(0), MeowSaveFileManager::CONFIRM_MESSAGE, 1)
    draw_text(contents.rect.x,contents.rect.y+fitting_height(0),contents.rect.width, fitting_height(0), MeowSaveFileManager::OVERWRITE_WARNING, 1)
    draw_text(contents.rect.x,contents.rect.y+fitting_height(2),contents.rect.width, fitting_height(0), "/", 1)
  end
end
class Window_StartNewConfirm < Window_HorzCommand
  def initialize
    super(0, 0)
    update_placement
    self.opacity = 0
  end
  def window_width
    return 240
  end
  def col_max
    return 2
  end
  def spacing
    return 12
  end
  def update_placement
    self.x = (Graphics.width - window_width) / 2
  end
  def make_command_list
    add_command(MeowSaveFileManager::YES, :ok)
    add_command(MeowSaveFileManager::NO,   :cancel)
  end
end
class Scene_Title < Scene_Base
  alias meow_st_start_sm start
  def start
    meow_st_start_sm
    create_ask_window
    create_confirm_window
  end
  def mf_start_new_game
    DataManager.setup_new_game
    close_command_window
    fadeout_all
    $game_map.autoplay
    SceneManager.goto(Scene_Map)
  end
  def create_ask_window
    @ask_window = Window_StartNewAsk.new
    @ask_window.hide
  end
  def create_confirm_window
    @confirm_select_window = Window_StartNewConfirm.new
    @confirm_select_window.y = @ask_window.y + (24*3)
    @confirm_select_window.set_handler(:ok,     method(:on_confirm_ok))
    @confirm_select_window.set_handler(:cancel, method(:on_confirm_cancel))
    @confirm_select_window.hide.deactivate
  end
  def on_confirm_ok
    @ask_window.close
    @confirm_select_window.close
    DataManager.delete_save_file(0)
    mf_start_new_game
  end
  def on_confirm_cancel
    @ask_window.hide
    @confirm_select_window.hide.deactivate
    @command_window.show.activate
  end
  def command_new_game #overwrite
    if DataManager.save_file_exists?
      @command_window.hide.deactivate
      @ask_window.show
      @confirm_select_window.show.activate
    else
      mf_start_new_game
    end
  end
  def command_continue #overwrite
    close_command_window
    if DataManager.load_game(0)
      Sound.play_load
      fadeout_all
      $game_system.on_after_load
      SceneManager.goto(Scene_Map)
    else
      Sound.play_buzzer
    end
  end
end
class Scene_Map < Scene_Base
  def create_save_message_window
    @sm_window = Window_SaveMessage.new
  end
  def show_save_message
    @sm_window.open
  end
  alias meow_sm_caw_sm create_all_windows
  def create_all_windows #alias
    meow_sm_caw_sm
    create_save_message_window
  end
end
class Scene_Menu < Scene_MenuBase
  def command_save #overwrite
    if DataManager.save_game(0)
      Sound.play_save
      $game_map.sm_show = true
      return_scene
    else
      Sound.play_buzzer
    end
  end
end