gistfile1.rb

require 'em-dir-watcher'

DIR = %x{pwd}.strip 

EM.run {
    dw = EMDirWatcher.watch DIR do |paths|
        paths.each do |file|
            if File.exists? file 
                puts "! FILE MODIFIED #{file}"
            else
                puts "! FILE REMOVED #{file}"
            end
        end
    end
    puts "! WATCHER INITIALIZED"
}