docs: def config_to_equation(poi=None):
      """
      Generates a product.equation file for the given product name.
      It generates it from the <product_name>.config file in the products folder.
      For that you need to have your project imported to featureIDE and set the correct settings.
      """
      from . import utils
  
      container_dir, product_name = tasks.get_poi_tuple(poi=poi)
      info_object = utils.get_feature_ide_paths(container_dir, product_name)
      feature_list = list()
  
      try:
          print('*** Processing ', info_object.config_file_path)
          with open(info_object.config_file_path, 'r') as config_file:
  
              config_file = config_file.readlines()
              for line in config_file:
                  # in FeatureIDE we cant use '.' for the paths to sub-features so we used '__'
                  # e.g. django_productline__features__development
                  if len(line.split('__')) <= 2:
                      line = line
                  else:
                      line = line.replace('__', '.')
  
                  if line.startswith('abstract_'):
                      # we skipp abstract features; this is a special case as featureIDE does not work with abstract
                      # sub trees / leafs.
                      line = ''
  
                  feature_list.append(line)
      except IOError:
          print('{} does not exist. Make sure your config file exists.'.format(info_object.config_file_path))
  
      feature_list = tasks.get_ordered_feature_list(info_object, feature_list)
  
      try:
          with open(info_object.equation_file_path, 'w') as eq_file:
              eq_file.writelines(feature_list)
          print('*** Successfully generated product.equation')
      except IOError:
          print('product.equation file not found. Please make sure you have a valid product.equation in your chosen product')
  
      # finally performing the validation of the product equation
      tasks.validate_product_equation()