module Bundler::FileUtils

def symbolic_modes_to_i(mode_sym, path)  #:nodoc:
  path = File.stat(path) unless File::Stat === path
  mode = path.mode
  mode_sym.split(/,/).inject(mode & 07777) do |current_mode, clause|
    target, *actions = clause.split(/([=+-])/)
    raise ArgumentError, "invalid file mode: #{mode_sym}" if actions.empty?
    target = 'a' if target.empty?
    user_mask = user_mask(target)
    actions.each_slice(2) do |op, perm|
      need_apply = op == '='
      mode_mask = (perm || '').each_char.inject(0) do |mask, chr|
        case chr
        when "r"
          mask | 0444
        when "w"
          mask | 0222
        when "x"
          mask | 0111
        when "X"
          if path.directory?
            mask | 0111
          else
            mask
          end
        when "s"
          mask | 06000
        when "t"
          mask | 01000
        when "u", "g", "o"
          if mask.nonzero?
            current_mode = apply_mask(current_mode, user_mask, op, mask)
          end
          need_apply = false
          copy_mask = user_mask(chr)
          (current_mode & copy_mask) / (copy_mask & 0111) * (user_mask & 0111)
        else
          raise ArgumentError, "invalid 'perm' symbol in file mode: #{chr}"
        end
      end
      if mode_mask.nonzero? || need_apply
        current_mode = apply_mask(current_mode, user_mask, op, mode_mask)
      end
    end
    current_mode
  end
end