[RMXP] Incremental Wait Timers 1.1

#:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:
# Incremental Wait Timers
# Author: ForeverZer0
# Date: 5.9.2011
# Version: 1.1
#:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:
#
# Explanation:
#
#  This is a little scripting tool I made to schedule events through scripting
#  or script calls a little easier without the need create custom timers for
#  everything. It will also eliminate the need to create a common event if you
#  wanted to have a script call after a "Wait" command, but it would be cleared
#  if the player walked off the current map when in a normal event.
#
# Instructions:
#
#   Either through a script or script call, use the following commands:
#
#     - $game_system.wait(FRAME_WAIT, 'STRING1', STRING2, etc, etc)
#
#     - $game_system.pause_timers(true/false)
#
#   The first command is the one to add timers. The first argument is the number
#   of frames to wait before executing. The timers will run so long as the
#   update method of $game_system is called, which by default is during
#   Scene_Map and Scene_Battle. Any arguments after the first must being written
#   as strings, that is with either single (' ') or double (" ") quotes around
#   them. These strings will be passed to the Kernel.eval method when the timer
#   reaches 0.
#
#   The second script call will pause the timers and keep them from updating.
#   "true" will pause them, while "false" will unpause them.
#
#:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:=:

class Game_System

  attr_reader :wait_timer
  attr_reader :paused

  alias zer0_wait_timers_init initialize
  def initialize
    zer0_wait_timers_init
    # Initialize instance variables
    @wait_timers, @timers_paused = [], false
  end

  alias zer0_wait_timers_upd update
  def update
    if !@timers_paused && @wait_timers.size > 0
      # Iterate throught timers and reduce wait time for each by 1
      @wait_timers.each {|timer|
        timer[0] -= 1
        # Execute all script calls and remove timer when timer reaches 0
        if timer[0] <= 0
          (1...timer.size).each {|i| eval(timer[i]) }
          @wait_timers -= [timer]
        end
      }
    end
    # Normal update method of Game_System
    zer0_wait_timers_upd
  end

  def clear_timers
    # Clear timers by settiing array to an empty array
    @wait_timers = []
  end

  def pause_timers(bool = true)
    # Set bool value for "pause"
    @timers_paused = bool
  end

  def wait(*args)
    # Add supplied array of arguments to the timer queue
    @wait_timers.push(args)
  end
end