registry.py
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	# -- coding: utf-8 --
	#
	# This file is part of Invenio.
	# Copyright (C) 2013, 2014, 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.

	__all__ = ['previewerext', 'previewers']

	from invenio.ext.registry import ModuleAutoDiscoverySubRegistry
	from flask_registry import RegistryProxy
	from invenio.utils.datastructures import LazyDict

	previewerext = RegistryProxy(
	'previewerext',
	ModuleAutoDiscoverySubRegistry,
	'previewerext'
	)


	def dummy_can_preview(f):
	pass


	def dummy_preview(f, emb=None):
	pass

	previewers = LazyDict(lambda: dict(map(lambda m: (
	m.__name__.split('.')[-1],
	dict(can_preview=getattr(m, 'can_preview', dummy_can_preview),
	preview=getattr(m, 'preview', dummy_preview))), previewerext)))