Accessing global attributes from inside a macro in Jinja2

I've been using macros in Jinja2 extensively and find them very DR开发者_运维百科Y-ish; but there is one thing bothering me: how to access global stuff from macros? It would be really neat if I could somehow access url_for() natively from a macro.

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You can make any callable available in the Jinja environment:

jinja_env = Environment(...)
jinja_env.globals['url_for'] = url_for

For example, this output u'foobar' in a shell:

from jinja2 import Environment
env = Environment()
env.globals['foo'] = lambda: "foobar"
env.from_string('{% macro bar() %}{{ foo() }}{% endmacro %}{{ bar() }}').render()