utils.py
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	# -- coding: utf-8 --
	##
	## This file is part of Invenio.
	## Copyright (C) 2015 CERN.
	##
	## Invenio is free software; you can redistribute it and/or
	## modify it under the terms of the GNU General Public License as
	## published by the Free Software Foundation; either version 2 of the
	## License, or (at your option) any later version.
	##
	## Invenio is distributed in the hope that it will be useful, but
	## WITHOUT ANY WARRANTY; without even the implied warranty of
	## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	## General Public License for more details.
	##
	## You should have received a copy of the GNU General Public License
	## along with Invenio; if not, write to the Free Software Foundation, Inc.,
	## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

	"""Utils related to Jinja templates."""

	from flask import current_app


	def render_macro_from_template(name, template, app=None, ctx=None):
	"""Render macro with the given context.

	:param name: macro name.
	:type name: string.
	:param template: template name.
	:type template: string.
	:param app: Flask app.
	:type app: object.
	:param ctx: parameters of the macro.
	:type ctx: dict.
	:return: unicode string with rendered macro.
	"""
	ctx = ctx or {}
	app = app or current_app
	tpl = app.jinja_env.get_template(template)
	macro = getattr(tpl.make_module(), name)
	return unicode(macro(**ctx))