XAS Enemy Kill Counter by Narzew v 1.00

#====================================================
#**XAS Enemy Kill Counter
#**v 1.00
#**28.03.15
#**Narzew
#====================================================
#**License: GPL v3
#**Website: HackTut.org
#====================================================
#**Designed for XAS 3.91
#**Not tested with XAS 3.8 or lower
#====================================================
#**Instructions:
#**Paste the script in Xas Addons Section (below XAS Engine)
#**Use $game_system.get_enemy_kills(enemy_id) to get enemy kills
#**for example: $game_system.get_enemy_kills(2) will get number
#**of enemies with id 2 killed.
#====================================================

#====================================================
#**Game_System overwrite
#====================================================

class Game_System
  attr_accessor :enemy_kills
  alias xas_enemy_kill_counter_narzew1 initialize

  #====================================================
  #**Overwrite initialize method
  #====================================================

  def initialize
    @enemy_kills = []
    xas_enemy_kill_counter_narzew1
  end

  #====================================================
  #**gain_enemy_kill(id) => gain enemy kill of id
  #====================================================

  def gain_enemy_kill(id)
    if @enemy_kills[id] == nil
      @enemy_kills[id] = 0
    end
    @enemy_kills[id] += 1
  end

  #====================================================
  #**get_enemy_kills(id) => return number of kills of a enemy id
  #====================================================

  def get_enemy_kills(id)
    if @enemy_kills[id] == nil
      @enemy_kills[id] = 0
    end
    return @enemy_kills[id]
  end

end

#====================================================
#**Game_Event overwrite
#====================================================

class Game_Event < Game_Character

  #====================================================
  #**Overwrite enemy_defat_process defined by XAS
  #====================================================

  alias xas_enemy_kill_counter_narzew2 enemy_defeat_process
  def enemy_defeat_process(enemy)
    $game_system.gain_enemy_kill(enemy.id)
    xas_enemy_kill_counter_narzew2(enemy)
  end

end

#====================================================
#**Anti Save Corruption
#**Rewrite Scene_Load::read_save_data
#====================================================
#**If you use custom load system, comment method below and add:
#**$game_system.enemy_kills = [] if $game_system.enemy_kills == nil
#**after line:
#**$game_system = Marshal.load(file)
#====================================================

class Scene_Load < Scene_File
  alias xas_enemy_kill_counter_narzew3 read_save_data
  def read_save_data(file)
    xas_enemy_kill_counter_narzew3(file)
    $game_system.enemy_kills = [] if $game_system.enemy_kills == nil
  end
end