gistfile1.rb

#!/usr/bin/env macruby
framework 'Foundation'

class BrowserDelegate
  def initialize
    @services_queue = Dispatch::Queue.new('service_access_queue')
    @services = []
  end

  def netServiceBrowserWillSearch(browser)
    puts 'Oh boy! Here we go...'
  end

  def netServiceBrowser(browser, didFindService: a_service, moreComing: more)
    puts "Got one!"
    @services_queue.sync { @services << a_service }
    a_service.delegate = self
    a_service.resolveWithTimeout(NSNumber.numberWithInt(5).doubleValue)
    a_service.scheduleInRunLoop(NSRunLoop.currentRunLoop, forMode: NSDefaultRunLoopMode)
    unless more
      puts 'Ok, we\'re done here...'
      browser.removeFromRunLoop(NSRunLoop.currentRunLoop, forMode: NSDefaultRunLoopMode)
    end
  end

  def netServiceDidResolveAddress(a_service)
    puts "There's a #{ARGV[0]} service running at #{a_service.hostName}"
    a_service.removeFromRunLoop(NSRunLoop.currentRunLoop, forMode: NSDefaultRunLoopMode)
    @services_queue.sync { @services.delete_at(@services.index(a_service))}
  end

  def netService(a_service, didNotResolve: error)
    puts "Not enough time, man!"
    a_service.removeFromRunLoop(NSRunLoop.currentRunLoop, forMode: NSDefaultRunLoopMode)
    @services_queue.sync { @services.delete_at(@services.index(a_service)) }
  end

  def still_resolving?
    taking_a_while = false
    @services_queue.sync { taking_a_while = @services.empty? }
    taking_a_while
  end
end

service_browser = NSNetServiceBrowser.alloc.init
browser_delegate = BrowserDelegate.new
service_browser.delegate = browser_delegate
service_browser.searchForServicesOfType(ARGV[0], inDomain: '')
service_browser.scheduleInRunLoop(NSRunLoop.currentRunLoop, forMode: NSDefaultRunLoopMode)

loop do
  NSRunLoop.currentRunLoop.runUntilDate(NSDate.dateWithTimeIntervalSinceNow 1.0)
  break unless browser_delegate.still_resolving?
end