text: # -*- coding: utf-8 -*-
  
  from __future__ import (unicode_literals, division, absolute_import,
                          print_function)
  
  __license__   = 'GPL v3'
  __copyright__ = '2020, Jim Miller'
  __docformat__ = 'restructuredtext en'
  
  import collections
  from functools import reduce
  
  from io import StringIO
  
  import logging
  logger = logging.getLogger(__name__)
  
  from fanficfare import adapters
  from fanficfare.configurable import Configuration
  from calibre_plugins.fanficfare_plugin.prefs import prefs
  from fanficfare.six import ensure_text
  from fanficfare.six.moves import configparser
  
  def get_fff_personalini():
      return prefs['personal.ini']
  
  def get_fff_config(url,fileform="epub",personalini=None):
      if not personalini:
          personalini = get_fff_personalini()
      sections=['unknown']
      try:
          sections = adapters.getConfigSectionsFor(url)
      except Exception as e:
          logger.debug("Failed trying to get ini config for url(%s): %s, using section %s instead"%(url,e,sections))
      configuration = Configuration(sections,fileform)
      configuration.readfp(StringIO(ensure_text(get_resources("plugin-defaults.ini"))))
      configuration.readfp(StringIO(ensure_text(personalini)))
  
      return configuration
  
  def get_fff_adapter(url,fileform="epub",personalini=None):
      return adapters.getAdapter(get_fff_config(url,fileform,personalini),url)
  
  def test_config(initext):
      try:
          configini = get_fff_config("test1.com?sid=555",
                                      personalini=initext)
          errors = configini.test_config()
      except configparser.ParsingError as pe:
          errors = pe.errors
  
      return errors
  
  
  class OrderedSet(collections.MutableSet):
  
      def __init__(self, iterable=None):
          self.end = end = []
          end += [None, end, end]         # sentinel node for doubly linked list
          self.map = {}                   # key --> [key, prev, next]
          if iterable is not None:
              self |= iterable
  
      def __len__(self):
          return len(self.map)
  
      def __contains__(self, key):
          return key in self.map
  
      def add(self, key):
          if key not in self.map:
              end = self.end
              curr = end[1]
              curr[2] = end[1] = self.map[key] = [key, curr, end]
  
      def discard(self, key):
          if key in self.map:
              key, prev, next = self.map.pop(key)
              prev[2] = next
              next[1] = prev
  
      def __iter__(self):
          end = self.end
          curr = end[2]
          while curr is not end:
              yield curr[0]
              curr = curr[2]
  
      def __reversed__(self):
          end = self.end
          curr = end[1]
          while curr is not end:
              yield curr[0]
              curr = curr[1]
  
      def pop(self, last=True):
          if not self:
              raise KeyError('set is empty')
          key = self.end[1][0] if last else self.end[2][0]
          self.discard(key)
          return key
  
      def __repr__(self):
          if not self:
              return '%s()' % (self.__class__.__name__,)
          return '%s(%r)' % (self.__class__.__name__, list(self))
  
      def __eq__(self, other):
          if isinstance(other, OrderedSet):
              return len(self) == len(other) and list(self) == list(other)
          return set(self) == set(other)
  
  def get_common_elements(ll):
      ## returns a list of elements common to all lists in ll
      ## https://www.tutorialspoint.com/find-common-elements-in-list-of-lists-in-python
      return list(reduce(lambda i, j: i & j, (OrderedSet(n) for n in ll)))
  