module INotify::Native::Flags

def self.from_mask(mask)
  constants.map {|c| c.to_s}.select do |c|
    next false unless c =~ /^IN_/
    const_get(c) & mask != 0
  end.map {|c| c.sub("IN_", "").downcase.to_sym} - [:all_events]
end

def self.to_mask(flags)
  flags.map {|flag| const_get("IN_#{flag.to_s.upcase}")}.
    inject(0) {|mask, flag| mask | flag}
end