old_contents: """Utilities to read and write images in various formats."""
  
  from _plugins import load as load_plugin
  from _plugins import use as use_plugin
  from _plugins import available as plugins
  
  # Add this plugin so that we can read images by default
  load_plugin('pil')
  
  from sift import *
  from collection import *
  
  from io import *
  
new_contents: __doc__ = """Utilities to read and write images in various formats.
  
  The following plug-ins are available:
  
  """
  
  from _plugins import load as load_plugin
  from _plugins import use as use_plugin
  from _plugins import available as plugins
  from _plugins import info as plugin_info
  
  # Add this plugin so that we can read images by default
  load_plugin('pil')
  
  from sift import *
  from collection import *
  
  from io import *
  
  def _update_doc(doc):
      """Add a list of plugins to the module docstring, formatted as
      a ReStructuredText table.
  
      """
      from textwrap import wrap
  
      info = [(p, plugin_info(p)) for p in plugins() if not p == 'test']
      col_1_len = max([len(n) for (n, _) in info])
  
      wrap_len = 73
      col_2_len = wrap_len - 1 - col_1_len
  
      # Insert table header
      info.insert(0, ('=' * col_1_len, {'description': '=' * col_2_len}))
      info.insert(1, ('Plugin', {'description': 'Description'}))
      info.insert(2, ('-' * col_1_len, {'description': '-' * col_2_len}))
      info.append(   ('=' * col_1_len, {'description': '=' * col_2_len}))
  
      for (name, meta_data) in info:
          wrapped_descr = wrap(meta_data.get('description', ''),
                               col_2_len)
          doc += "%s %s\n" % (name.ljust(col_1_len),
                              '\n'.join(wrapped_descr))
      doc = doc.strip()
  
      return doc
  
  __doc__ = _update_doc(__doc__)
  
subject: Add table of available plugins to module docstring.