old_contents: """Utilities to read and write images in various formats.
  
  The following plug-ins are available:
  
  """
  
  from ._plugins import *
  from .sift import *
  from .collection import *
  
  from ._io import *
  from ._image_stack import *
  from .video import *
  
  
  reset_plugins()
  
  
  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 available_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__)
  
new_contents: """Utilities to read and write images in various formats.
  
  The following plug-ins are available:
  
  """
  
  from ._plugins import *
  from .sift import *
  from .collection import *
  
  from ._io import *
  from ._image_stack import *
  from .video import *
  
  
  reset_plugins()
  
  WRAP_LEN = 73
  
  
  def _separator(char, lengths):
      return [char * separator_length for separator_length in lengths]
  
  
  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).get('description', 'no description'))
              for p in available_plugins if not p == 'test']
  
      col_1_len = max([len(n) for (n, _) in info])
      col_2_len = WRAP_LEN - 1 - col_1_len
  
      # Insert table header
      info.insert(0, _separator('=', (col_1_len, col_2_len)))
      info.insert(1, ('Plugin', 'Description'))
      info.insert(2, _separator('-', (col_1_len, col_2_len)))
      info.append(_separator('-', (col_1_len, col_2_len)))
  
      for (name, plugin_description) in info:
          wrapped_descr = wrap(plugin_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: Refactor io doc building code