Ruby FSEvents & rsync insanely easy to write directory mirror

adhoc_watcher.rb

# Just added a subprocess call to rsync to one of rb-fsevent's example
# scripts. Spookily easy.

require 'rubygems'
require 'rb-fsevent'
require 'open3'

include Open3

fsevent = FSEvent.new
fsevent.watch Dir.pwd do |directories|
  popen3('rsync',
         '-avr',
         '--exclude=.hg',
         '--exclude=env/vpython',
         '.',
         'thehost:~/src/the-src-repo') do |stdin, stdout, stderr|
    stdout.read.split("\n").each do |line|
      puts "rsync: #{line}"
    end
  end
end
fsevent.run