Platform dependent gems

Gemfile

group :production, :test, :cucumber, :staging do
  gem 'rb-inotify', :require => false
end

group :test, :development, :cucumber do
  gem 'rb-fsevent', :require => false
end

inotify_proxy.rb

def is_mac?
  RUBY_PLATFORM.downcase.include?("darwin")
end

def is_windows?
  RUBY_PLATFORM.downcase.include?("mswin")
end

def is_linux?
  RUBY_PLATFORM.downcase.include?("linux")
end

require 'rb-inotify' if is_linux?
require 'rb-fsevent' if is_mac?

class InotifyProxy

	attr_reader :notifier

  #
  # Accepts the ablosute_path which the notifier 
  # will monitor
  #
	def initialize(absolute_path, options={})
		@path = absolute_path
		@notifier = INotify::Notifier.new if is_linux?
		@notifier = FSEvent.new if  is_mac?
	end

  #
  # Accepts a Proc object containing the code
  # to be executed when a notifier event occurs
  #
	def watch(proc=nil)
		proc = lambda { |event| puts "Detected change inside: #{event.class}" } if proc.nil? and not(proc.kind_of?(Proc))
		if is_mac?
			@notifier.watch([@path]) do |event|
				proc.call(event)
			end
		elsif is_linux?
			@notifier.watch(@path, :moved_to, :create) do |event|
				proc.call(event)
			end
		end
		puts "Watching #{@path}"
	end

	def run
		@notifier.run
	end

	def stop
		@notifier.stop
	end
end

usage.rb

# Watch the root
notifier = InotifyProxy.new('/')
notifier.watch
# Run in an infinite loop
notifier.run