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# -*- coding: utf-8 -*- |
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"""Jinja2 environment and extensions loading.""" |
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from jinja2 import Environment, StrictUndefined |
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from .exceptions import UnknownExtension |
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class ExtensionLoaderMixin(object): |
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"""Mixin providing sane loading of extensions specified in a given context. |
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The context is being extracted from the keyword arguments before calling |
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the next parent class in line of the child. |
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""" |
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def __init__(self, **kwargs): |
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"""Initialize the Jinja2 Environment object while loading extensions. |
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Does the following: |
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1. Establishes default_extensions (currently just a Time feature) |
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2. Reads extensions set in the cookiecutter.json _extensions key. |
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3. Attempts to load the extensions. Provides useful error if fails. |
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""" |
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context = kwargs.pop('context', {}) |
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default_extensions = [ |
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'jinja2_time.TimeExtension', |
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'cookiecutter.extensions.JsonifyExtension' |
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] |
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extensions = default_extensions + self._read_extensions(context) |
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try: |
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super(ExtensionLoaderMixin, self).__init__( |
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extensions=extensions, |
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**kwargs |
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) |
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except ImportError as err: |
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raise UnknownExtension('Unable to load extension: {}'.format(err)) |
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def _read_extensions(self, context): |
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"""Return list of extensions as str to be passed on to the Jinja2 env. |
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If context does not contain the relevant info, return an empty |
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list instead. |
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""" |
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try: |
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extensions = context['cookiecutter']['_extensions'] |
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except KeyError: |
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return [] |
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else: |
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return [str(ext) for ext in extensions] |
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class StrictEnvironment(ExtensionLoaderMixin, Environment): |
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"""Create strict Jinja2 environment. |
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Jinja2 environment will raise error on undefined variable in template- |
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rendering context. |
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""" |
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def __init__(self, **kwargs): |
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"""Set the standard Cookiecutter StrictEnvironment. |
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Also loading extensions defined in cookiecutter.json's _extensions key. |
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""" |
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super(StrictEnvironment, self).__init__( |
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undefined=StrictUndefined, |
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**kwargs |
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) |
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audreyr /
cookiecutter
