home *** CD-ROM | disk | FTP | other *** search
- #!/usr/bin/python
-
- # axi-query-expand - Query and show possible expansions
- #
- # Copyright (C) 2007 Enrico Zini <enrico@debian.org>
- #
- # This program 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.
- #
- # This program 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 this program; if not, write to the Free Software
- # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-
- from optparse import OptionParser
- import sys
-
- VERSION="0.1"
-
- # Let's start with a simple command line parser with help
- class Parser(OptionParser):
- def __init__(self, *args, **kwargs):
- OptionParser.__init__(self, *args, **kwargs)
-
- def error(self, msg):
- sys.stderr.write("%s: error: %s\n\n" % (self.get_prog_name(), msg))
- self.print_help(sys.stderr)
- sys.exit(2)
-
- parser = Parser(usage="usage: %prog [options] keywords",
- version="%prog "+ VERSION,
- description="Query the Apt Xapian index. Command line arguments can be keywords or Debtags tags")
- parser.add_option("-t", "--type", help="package type, one of 'game', 'gui', 'cmdline' or 'editor'")
-
- (options, args) = parser.parse_args()
-
-
- # Import the rest here so we don't need dependencies to be installed only to
- # print commandline help
- import os
- import xapian
- from aptxapianindex import *
-
-
- # Instantiate a xapian.Database object for read only access to the index
- db = xapian.Database(XAPIANDB)
-
- # Build the base query as seen in axi-query-simple.py
- query = xapian.Query(xapian.Query.OP_OR, termsForSimpleQuery(args))
-
- # Add the simple user filter, if requeste
- query = addSimpleFilterToQuery(query, options.type)
-
- # Perform the query
- enquire = xapian.Enquire(db)
- enquire.set_query(query)
-
- # Retrieve the top 20 results
- matches = enquire.get_mset(0, 20)
-
- # Display the results
- show_mset(matches)
-
- # Now, we ask Xapian what are the terms in the index that are most relevant to
- # this search. This can be used to suggest to the user the most useful ways of
- # refining the search.
-
- # Select the first 10 documents as the key ones to use to compute relevant
- # terms
- rset = xapian.RSet()
- for m in matches:
- rset.add_document(m[xapian.MSET_DID])
-
- # This is the "Expansion set" for the search: the 10 most relevant terms
- eset = enquire.get_eset(10, rset)
-
- # Print it out. Note that some terms have a prefix from the database: can we
- # filter them out? Indeed: Xapian allow to give a filter to get_eset.
- # Read on...
- print
- print "Terms that could improve the search:",
- print ", ".join(["%s (%.2f%%)" % (res.term, res.weight) for res in eset])
-
-
- # You can also abuse this feature to show what are the tags that are most
- # related to the search results. This allows you to turn a search based on
- # keywords to a search based on semantic attributes, which would be an
- # absolutely stunning feature in a GUI.
-
- # We can do it thanks to Xapian allowing to specify a filter for the output of
- # get_eset. This filter filters out all the keywords that are not tags, or
- # that were in the list of query terms.
- class Filter(xapian.ExpandDecider):
- def __call__(self, term):
- """
- Return true if we want the term, else false
- """
- return term[:2] == "XT"
-
- # This is the "Expansion set" for the search: the 10 most relevant terms that
- # match the filter
- eset = enquire.get_eset(10, rset, Filter())
-
- # Print out the resulting tags
- print
- print "Tags that could improve the search:",
- print ", ".join(["%s (%.2f%%)" % (res.term[2:], res.weight) for res in eset])
-
- sys.exit(0)
-