def autocomplete(input_list):
  """
  <Purpose>
    Returns all valid input completions for the specified command line input.
  
  <Arguments>
    input_list: A list of tokens.
  
  <Side Effects>
    None
  
  <Exceptions>
    None
    
  <Returns>
    A list of strings representing valid completions.
  """
  if input_list[0] in ['modulehelp', 'enable', 'disable']:
    commands = []
    for modulename in seash_modules.module_data.keys():
      commands.append(input_list[0] + ' ' + modulename)
    return commands
  return []