new_contents: #!/usr/bin/python
  #
  # RStudio does not provide a "-latest" download link so we deduce it from
  # their S3 bucket listing and save the download to /tmp/rstudio-latest.deb.
  #
  # Test this script by running:
  # wget -O /tmp/somefile.xml http://download1.rstudio.org
  # python thisscript.py /tmp/somefile.xml
  
  import sys
  import urllib
  import xml.etree.ElementTree as ET
  
  # There's also download2
  RSTUDIO_MIRROR = 'http://download1.rstudio.org'
  DEST = '/tmp/rstudio-latest.deb'
  
  # Debugging; save output from RSTUDIO_MIRROR to a file then specify the
  # path to the file as first argument
  DEBUG = len(sys.argv) > 1
  
  if DEBUG:
  	f = open(sys.argv[1])
  else:
  	f = urllib.urlopen(RSTUDIO_MIRROR)
  
  # S3 bucket; http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGET.html
  root = ET.parse(f).getroot()
  # {http://s3.amazonaws.com/doc/2006-03-01/}
  namespace = root.tag.split('ListBucketResult')[0]
  
  latest = ''
  
  for child in root:
  	try: filename = child.find(namespace + 'Key').text
  	except: continue
  
  	# Filename comparison relies on rstudio's stable naming convention
  	if filename.endswith('amd64.deb') and filename > latest: latest = filename
  
  if DEBUG:
  	print RSTUDIO_MIRROR + '/' + latest
  else:
  	dl = urllib.urlretrieve(RSTUDIO_MIRROR + '/' + latest, DEST)
  
subject: Add a utility to retrieve the latest version of RStudio.