old_contents: from os import environ
  from os.path import realpath, dirname, join, abspath
  try:
      from yaml import load
  except:
      from sys import exit, stderr
      stderr.write('[E] install pyyaml\n')
      exit(2)
  
  searx_dir = abspath(dirname(__file__))
  engine_dir = dirname(realpath(__file__))
  
  if 'SEARX_SETTINGS_PATH' in environ:
      settings_path = environ['SEARX_SETTINGS_PATH']
  else:
      settings_path = join(searx_dir, 'settings.yml')
  
  
  with open(settings_path) as settings_yaml:
      settings = load(settings_yaml)
  
new_contents: '''
  searx is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  searx is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU Affero General Public License for more details.
  
  You should have received a copy of the GNU Affero General Public License
  along with searx. If not, see < http://www.gnu.org/licenses/ >.
  
  (C) 2013- by Adam Tauber, <asciimoo@gmail.com>
  '''
  
  from os import environ
  from os.path import realpath, dirname, join, abspath
  try:
      from yaml import load
  except:
      from sys import exit, stderr
      stderr.write('[E] install pyyaml\n')
      exit(2)
  
  searx_dir = abspath(dirname(__file__))
  engine_dir = dirname(realpath(__file__))
  
  # if possible set path to settings using the enviroment variable SEARX_SETTINGS_PATH
  if 'SEARX_SETTINGS_PATH' in environ:
      settings_path = environ['SEARX_SETTINGS_PATH']
  # otherwise using default path
  else:
      settings_path = join(searx_dir, 'settings.yml')
  
  
  # load settings
  with open(settings_path) as settings_yaml:
      settings = load(settings_yaml)
  
subject: add comments to __init__.py