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- #!/usr/bin/python
-
- # axi-query-adaptivecutoff - Use an adaptive cutoff to select results
- #
- # 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 first result, and check its relevance
- matches = enquire.get_mset(0, 1)
- topWeight = matches[0].weight
-
- # Tell Xapian that we only want results that are at least 70% as good as that
- enquire.set_cutoff(0, topWeight * 0.7)
-
- # Now we have a meaningful cutoff, so we can get a larger number of results:
- # thanks to the cutoff, approximate results will stop before starting to be
- # really bad.
- matches = enquire.get_mset(0, 200)
-
- # Display the results
- show_mset(matches)
-
- sys.exit(0)
-