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/
usr/
share/
doc/
apt-xapian-index/
examples/
- drwxr-xr-x
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Viewing file:  axi-query-adaptivecutoff.py (2.59 KB) -rwxr-xr-xSelect action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
#!/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)
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