old_contents: from __future__ import absolute_import
  from webassets.filter import Filter
  
  
  __all__ = ('Jinja2',)
  
  
  class Jinja2(Filter):
      """Process a file through the Jinja2 templating engine.
  
      Requires the ``jinja2`` package (https://github.com/mitsuhiko/jinja2).
  
      The Jinja2 context can be specified with the `JINJA2_CONTEXT` configuration
      option or directly with `context={...}`. Example:
  
      .. code-block:: python
  
          Bundle('input.css', filters=Jinja2(context={'foo': 'bar'}))
      """
  
      name = 'jinja2'
      max_debug_level = None
      options = {
          'context': 'JINJA2_CONTEXT',
      }
  
      def setup(self):
          try:
              import jinja2
          except ImportError:
              raise EnvironmentError('The "jinja2" package is not installed.')
          else:
              self.jinja2 = jinja2
          super(Jinja2, self).setup()
  
      def input(self, _in, out, **kw):
          out.write(self.jinja2.Template(_in.read()).render(self.context or {}))
  
new_contents: from __future__ import absolute_import
  from webassets.filter import Filter
  
  
  __all__ = ('Jinja2',)
  
  
  class Jinja2(Filter):
      """Process a file through the Jinja2 templating engine.
  
      Requires the ``jinja2`` package (https://github.com/mitsuhiko/jinja2).
  
      The Jinja2 context can be specified with the `JINJA2_CONTEXT` configuration
      option or directly with `context={...}`. Example:
  
      .. code-block:: python
  
          Bundle('input.css', filters=Jinja2(context={'foo': 'bar'}))
      
      Additionally to enable template loading mechanics from your project you can provide
      `JINJA2_ENV` or `jinja2_env` arg to make use of already created environment.
      """
  
      name = 'jinja2'
      max_debug_level = None
      options = {
          'context': 'JINJA2_CONTEXT',
          'jinja2_env': 'JINJA2_ENV'
      }
  
      def setup(self):
          try:
              import jinja2
          except ImportError:
              raise EnvironmentError('The "jinja2" package is not installed.')
          else:
              self.jinja2 = jinja2
          super(Jinja2, self).setup()
  
      def input(self, _in, out, **kw):
          tpl_factory = self.jinja2_env.from_string if self.jinja2_env else self.jinja2.Template
          out.write(tpl_factory(_in.read()).render(self.context or {}))
  
subject: add jinja2 env option to its filter