gistfile1.rb

framework 'Cocoa'

url_string = 'http://macruby.icoretech.org/latest'
url        = NSURL.URLWithString(url_string)
req        = NSURLRequest.requestWithURL(url)

class Test
  def downloadDidBegin(dl_process)
    puts "downloading..."
  end
 
  def download(dl_process, decideDestinationWithSuggestedFilename:filename)
    home = NSHomeDirectory()
    path = home.stringByAppendingPathComponent('Desktop').stringByAppendingPathComponent(filename)
    dl_process.setDestination(path, allowOverwrite:true)
  end
 
  def download(dl_process, didFailWithError:error)
    error_description = error.localizedDescription
    more_details      = error.userInfo[NSErrorFailingURLStringKey]
    puts "Download failed. #{error_description} - #{more_details}"  
  end
 
  def downloadDidFinish(dl_process)
    puts "Download finished!"
    exit
  end
end
 
file_download = NSURLDownload.alloc.initWithRequest(req, delegate: Test.new)

# keep the run loop running
NSRunLoop.currentRunLoop.runUntilDate(NSDate.distantFuture)