old_contents: # -*- coding: utf-8 -*-
  '''
  Use varstack data as a Pillar source
  '''
  from __future__ import absolute_import
  
  # Import python libs
  import logging
  
  HAS_VARSTACK = False
  try:
      import varstack
      HAS_VARSTACK = True
  except ImportError:
      pass
  
  # Set up logging
  log = logging.getLogger(__name__)
  
  # Define the module's virtual name
  __virtualname__ = 'varstack'
  
  
  def __virtual__():
      if not HAS_VARSTACK:
          return False
      return __virtualname__
  
  
  def ext_pillar(minion_id,  # pylint: disable=W0613
                 pillar,  # pylint: disable=W0613
                 conf):
      '''
      Parse varstack data and return the result
      '''
      vs = varstack.Varstack(config_filename=conf)
      return vs.evaluate(__grains__)
  
new_contents: # -*- coding: utf-8 -*-
  '''
  Use `Varstack <https://github.com/conversis/varstack>`_ data as a Pillar source
  
  Configuring Varstack
  ====================
  
  Using varstack in Salt is fairly simple. Just put the following into the
  config file of your master:
  
  .. code-block:: yaml
  
      ext_pillar:
        - varstack: /etc/varstack.yaml
  
  Varstack will then use /etc/varstack.yaml to determine which configuration
  data to return as pillar information. From there you can take a look at the
  `README <https://github.com/conversis/varstack/blob/master/README.md>`_ of
  varstack on how this file is evaluated.
  '''
  
  from __future__ import absolute_import
  
  # Import python libs
  import logging
  
  HAS_VARSTACK = False
  try:
      import varstack
      HAS_VARSTACK = True
  except ImportError:
      pass
  
  # Set up logging
  log = logging.getLogger(__name__)
  
  # Define the module's virtual name
  __virtualname__ = 'varstack'
  
  
  def __virtual__():
      if not HAS_VARSTACK:
          return False
      return __virtualname__
  
  
  def ext_pillar(minion_id,  # pylint: disable=W0613
                 pillar,  # pylint: disable=W0613
                 conf):
      '''
      Parse varstack data and return the result
      '''
      vs = varstack.Varstack(config_filename=conf)
      return vs.evaluate(__grains__)
  
subject: add initial configuration documentation for varstack pillar