This object is a configured Jinja2 environment. For more information you can refer to the Jinja 2 Documentation.

This is where plugins can inject additional data like custom filters, tests or global functions.

Plugin Example

from lektor.pluginsystem import Plugin

class MyPlugin(Plugin):

    def on_setup_env(self, **extra):
        def shout_filter(value):
            return unicode(value).upper() + '!!!!1111'
        self.env.jinja_env.filters['shout'] = shout_filter

Then you can use this filter from templates:

<h1>{{ page.title|shout }}</h1>