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cited.py
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	# -- coding: utf-8 --
	#
	# This file is part of Invenio.
	# Copyright (C) 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.

	"""Cited search unit."""

	from intbitset import intbitset


	def search_unit(query, f, m, wl=None):
	"""Search for records with given citation count.

	Query usually looks like '10->23'.
	"""
	from invenio.modules.records.models import Record
	from invenio.legacy.bibrank.citation_searcher import (
	get_records_with_num_cites
	)
	numstr = '"{}"'.format(query)
	#this is sort of stupid but since we may need to
	#get the records that do _not_ have cites, we have to
	#know the ids of all records, too
	#but this is needed only if bsu_p is 0 or 0 or 0->0
	allrecs = intbitset()
	if query == 0 or query == "0" or \
	query.startswith("0->") or query.endswith("->0"):
	allrecs = Record.allids()
	return get_records_with_num_cites(numstr, allrecs)