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bfe_webjournal_rss.py
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Fri, Nov 15, 08:02

bfe_webjournal_rss.py
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# -*- coding: utf-8 -*-
## $Id: bfe_webjournal_widget_whatsNew.py,v 1.24 2009/01/27 07:25:12 jerome Exp $
##
## This file is part of Invenio.
## Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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.
"""
WebJournal widget - Display the index of the lastest articles,
including 'breaking news'.
"""
from invenio.webjournal_utils import \
parse_url_string, \
get_journal_categories, \
get_category_query
from invenio.messages import gettext_set_language
from invenio.config import CFG_SITE_URL
from invenio.urlutils import create_html_link
from invenio.dbquery import run_sql
from urllib import quote
def format_element(bfo, categories, label="Subscribe by RSS",
rss_icon_url="/img/rss.png", cc='', css_class="rssLink"):
"""
Display RSS links to journal articles, in one or several
categories, or to the whole journal (if 'cc' parameter is used).
Note about 'cc': if we want an RSS of *all* articles (whathever
the category is), either we build an RSS url to each of the
categories/collections of the journal, or we simply link to the
main collection ('cc') of the journal (which implies that journal
categories exist as sub-collections of 'cc'). The second option is
preferred.
@param categories: comma-separated list of journal categories that will be linked from this RSS. If 'all', use all. If empty, try to use current category.
@param label: label of the RSS link
@param rss_icon_url: if provided, display the RSS icon in front of the label
@param cc: if provided, use as root collection for the journal, and ignore 'categories' parameter.
@param css_class: CSS class of the RSS link.
"""
args = parse_url_string(bfo.user_info['uri'])
category_name = args["category"]
journal_name = args["journal_name"]
ln = args["ln"]
_ = gettext_set_language(ln)
if cc:
categories = []
elif categories.lower() == 'all':
categories = get_journal_categories(journal_name)
elif not categories and category_name:
categories = [category_name]
else:
categories = categories.split(',')
# Build the query definition for selected categories. If a
# category name can a match collection name, we can simply search
# in this collection. Otherwise we have to search using the query
# definition of the category.
# Note that if there is one category that does not match a
# collection name, we have to use collections queries for all
# categories (we cannot display all records of a collection +
# apply search constraint on other collections)
collections = []
pattern = []
must_use_pattern = False
for category in categories:
dbquery = get_category_query(journal_name, category)
if dbquery:
pattern.append(dbquery)
res = None
if not must_use_pattern:
res = run_sql("SELECT name FROM collection WHERE dbquery=%s",
(dbquery,))
if res:
collections.append(res[0][0])
else:
# Could not find corresponding collection. Maybe
# replace '980__a' by 'collection'?
if not must_use_pattern:
res = run_sql("SELECT name FROM collection WHERE dbquery=%s",
(dbquery.replace('980__a', 'collection'),))
if res:
collections.append(res[0][0])
else:
# Really no matching collection name
# apparently. Use query definition.
must_use_pattern = True
# Build label
link_label = ''
if rss_icon_url:
if rss_icon_url.startswith('/'):
# Build an absolute URL
rss_icon_url = CFG_SITE_URL + rss_icon_url
link_label += '<img src="%s" alt="RSS" border="0"/> ' % rss_icon_url
if label:
link_label += _(label)
# Build link
rss_url = CFG_SITE_URL + '/rss'
if cc:
rss_url += '?cc=' + quote(cc)
elif must_use_pattern:
rss_url += '?p=' + quote(' or '.join(pattern))
else:
rss_url += '?c=' + '&amp;c='.join([quote(coll) \
for coll in collections])
rss_url += '&amp;ln=' + ln
return create_html_link(rss_url, {},
link_label=link_label,
linkattrd={'class': css_class})
def escape_values(bfo):
"""
Called by BibFormat in order to check if output of this element
should be escaped.
"""
return 0
_ = gettext_set_language('en')
dummy = _("Subscribe by RSS")

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