Tool Variable Usage for Falcao's ABS by Sixth

#===============================================================================
# * [ACE] Tool Variable Usage for Falcao's Pearl ABS Liquid v3
#===============================================================================
# * Made by: Sixth (www.rpgmakervxace.net, www.forums.rpgmakerweb.com)
# * Version: 1.0
# * Updated: 06/01/2016
# * Requires: Falcao's Pearl ABS Liquid v3
#-------------------------------------------------------------------------------
# * < Change Log >
#-------------------------------------------------------------------------------
# * Version 1.0 (06/01/2016)
#   - Initial release.
#-------------------------------------------------------------------------------
# * < Description >
#-------------------------------------------------------------------------------
# * This script lets you make tools which "use" game variables instead of
#   MP, TP or other items.
#-------------------------------------------------------------------------------
# * < Note-tags >
#-------------------------------------------------------------------------------
# * To assign a variable requirement for a tool, use this note-tag:
#
#     <var req: variable_id>
#
#   Replace 'variable_id' with the ID of the variable the tool will "use".
#   A tool with this note-tag will display the amount of the assigned variable
#   currently has on the toolbar.
#   The tool will automatically decrease the value of the assigned variable
#   by 1 upon usage!
#-------------------------------------------------------------------------------
# * < Installation >
#-------------------------------------------------------------------------------
# * Place this scipt below the last script from Falcao's Pearl ABS Liquid v3
#   script series but above Main!
# * If you are using my Toolbar Addon for Falcao's ABS script, you must put
#   this one below that one!
#-------------------------------------------------------------------------------
# * < Compatibility Info >
#-------------------------------------------------------------------------------
# * No known incompatibilities.
#-------------------------------------------------------------------------------
# * < Known Issues >
#-------------------------------------------------------------------------------
# * No known issues.
#-------------------------------------------------------------------------------
# * < Terms of Use >
#-------------------------------------------------------------------------------
# * Free to use for whatever purposes you want.
# * Credit me (Sixth) in your game, pretty please! :P
# * Posting modified versions of this script is allowed as long as you notice me
#   about it with a link to it!
#===============================================================================
$imported = {} if $imported.nil?
$imported["SixthABSToolVariables"] = true
#===============================================================================
# No settings! O.o
#===============================================================================

class RPG::BaseItem

  attr_accessor :var_req

  def var_req
    init_var_req if @var_req.nil?
    return @var_req
  end

  def init_var_req
    @var_req = 0
    @var_req = $1.to_i if @note =~ /<var req: (\d+)>/i
  end

end

class Game_CharacterBase

  alias set_var_req7753 load_abs_tool
  def load_abs_tool(item)
    set_var_req7753(item)
    if battler.is_a?(Game_Actor) && item
      if item.var_req != 0 && $game_variables[item.var_req] > 0
        $game_variables[item.var_req] -= 1
      end
    end
  end

end

class Game_BattlerBase

  alias add_var_reqs7753 usable?
  def usable?(item)
    if item && item.var_req != 0
      return false if $game_variables[item.var_req] <= 0
    end
    add_var_reqs7753(item)
  end

end

class Sprite_PearlTool < Sprite

  alias add_var_check8873 ammo_ready?
  def ammo_ready?(item)
    if item && item.var_req != 0
      return true
    end
    add_var_check8873(item)
  end

  alias add_var_display8832 itemcost
  def itemcost(item)
    if item && item.var_req != 0
      return $game_variables[item.var_req]
    end
    add_var_display8832(item)
  end

end
#==============================================================================
# !!END OF SCRIPT - OHH, NOES!!
#==============================================================================