old_contents: import sys
  from os.path import isfile, join
  
  
  def main(prefix=sys.prefix, verbose=False):
      """
      To bootstrap enstaller into a Python environment, used the following
      code:
  
      sys.path.insert(0, '/path/to/enstaller.egg')
      from egginst.bootstrap import main
      main()
      """
      import egginst
  
      # This is the path to the egg which we want to install.
      # Note that whoever calls this function has inserted the egg to the
      # from of sys.path
      egg_path = sys.path[0]
  
      print "Bootstrapping:", egg_path
      ei = egginst.EggInst(egg_path, prefix, verbose)
      ei.install()
  
  
  def fix_easy_pth(pth):
      new_lines = []
      needs_rewrite = False
      for line in open(pth):
          line = line.strip()
          if 'enstaller' in line.lower():
              needs_rewrite = True
          else:
              new_lines.append(line)
  
      if needs_rewrite:
          fo = open(pth, 'w')
          for line in new_lines:
              fo.write(line + '\n')
          fo.close()
          print "Removed enstaller entry from", pth
  
  
  def remove_and_fix():
      # Remove and fix some files in site-packages
      from egginst.utils import rm_rf, rel_site_packages
  
      site_dir = join(sys.prefix, rel_site_packages)
  
      # Remove old enstaller files which could cause problems
      for fn.lower() in 'enstaller.pth', 'enstaller.egg-link':
          rm_rf(join(site_dir, fn))
  
      # If there an easy-install.pth in site-packages, remove and
      # occurrences of enstaller from it.
      pth = join(site_dir, 'easy-install.pth')
      if isfile(pth):
          fix_easy_pth(pth)
  
  
  def cli():
      """
      CLI (for executable egg)
      """
      from optparse import OptionParser
      from enstaller import __version__
  
      p = OptionParser(usage="<executable egg> [options]",
                       description="bootstraps enstaller %(__version__)s into "
                                   "the current Python environment" % locals())
  
      p.add_option("--prefix",
                   action="store",
                   default=sys.prefix,
                   help="install prefix, defaults to %default")
  
      p.add_option('-v', "--verbose", action="store_true")
  
      p.add_option('--version', action="store_true")
  
      opts, args = p.parse_args()
  
      if opts.version:
          print "enstaller version:", __version__
          return
  
      main(opts.prefix, opts.verbose)
  
      remove_and_fix()
  
new_contents: import sys
  from os.path import isfile, join
  
  
  def main(prefix=sys.prefix, verbose=False):
      """
      To bootstrap enstaller into a Python environment, used the following
      code:
  
      sys.path.insert(0, '/path/to/enstaller.egg')
      from egginst.bootstrap import main
      main()
      """
      import egginst
  
      # This is the path to the egg which we want to install.
      # Note that whoever calls this function has inserted the egg to the
      # from of sys.path
      egg_path = sys.path[0]
  
      print "Bootstrapping:", egg_path
      ei = egginst.EggInst(egg_path, prefix, verbose)
      ei.install()
  
  
  def fix_easy_pth(pth):
      new_lines = []
      needs_rewrite = False
      for line in open(pth):
          line = line.strip()
          if 'enstaller' in line.lower():
              needs_rewrite = True
          else:
              new_lines.append(line)
  
      if needs_rewrite:
          fo = open(pth, 'w')
          for line in new_lines:
              fo.write(line + '\n')
          fo.close()
          print "Removed enstaller entry from", pth
  
  
  def remove_and_fix():
      # Remove and fix some files in site-packages
      from egginst.utils import rm_rf, rel_site_packages
  
      site_dir = join(sys.prefix, rel_site_packages)
  
      # If there an easy-install.pth in site-packages, remove and
      # occurrences of enstaller from it.
      pth = join(site_dir, 'easy-install.pth')
      if isfile(pth):
          fix_easy_pth(pth)
  
  
  def cli():
      """
      CLI (for executable egg)
      """
      from optparse import OptionParser
      from enstaller import __version__
  
      p = OptionParser(usage="<executable egg> [options]",
                       description="bootstraps enstaller %(__version__)s into "
                                   "the current Python environment" % locals())
  
      p.add_option("--prefix",
                   action="store",
                   default=sys.prefix,
                   help="install prefix, defaults to %default")
  
      p.add_option('-v', "--verbose", action="store_true")
  
      p.add_option('--version', action="store_true")
  
      opts, args = p.parse_args()
  
      if opts.version:
          print "enstaller version:", __version__
          return
  
      main(opts.prefix, opts.verbose)
  
      remove_and_fix()
  
subject: remove out-of-date code