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# axi-query-tags - Look for Debtags tags by keyword
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# Copyright (C) 2007 Enrico Zini <enrico@debian.org>
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# Copyright (C) 2008 Daniel Brumbaugh Keeney
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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OptionParser.new do |opts|
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opts.program_name = 'axi-query-pkgtype.rb'
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opts.release = '1203587714'
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"Query the Apt Xapian index. Command line arguments can be keywords or Debtags tags"
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opts.on '-t', '--type TYPE', "package type, one of 'game', 'gui', 'cmdline' or 'editor'" do |v|
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opts.on_tail("-h", "--help", "Show this message") do
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end.parse! rescue ( puts 'try axi-query-pkgtype.rb --help'; exit 2 )
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args = ARGV.collect do |i| i.dup; end
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# Import the rest here so we don't need dependencies to be installed only to
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# print commandline help
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require 'aptxapianindex'
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# Instantiate a xapian.Database object for read only access to the index
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db = Xapian::Database.new(XAPIANDB)
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# Stemmer function to generate stemmed search keywords
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stemmer = Xapian::Stem.new("english")
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# Build the base query
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query = Xapian::Query.new(Xapian::Query::OP_OR, terms_for_simple_query(args))
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enquire = Xapian::Enquire.new(db)
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# Now, instead of showing the results of the query, we ask Xapian what are the
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# terms in the index that are most relevant to this search.
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# Normally, you would use the results to suggest the user possible ways for
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# refining the search. I instead abuse this feature to see what are the tags
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# that are most related to the search results.
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# Select the first 10 documents as the key ones to use to compute relevant
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rset = Xapian::RSet.new
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enquire.mset(0, 5).matches.each do |m|
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# TODO: use adaptive quality threshold here
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rset.add_document(m.docid)
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# Xapian supports providing a filter object, to say that we are only interested
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# This one filters out all the keywords that are not tags, or that were in the
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# list of query terms.
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class Filter < Xapian::ExpandDecider
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# Return true if we want the term, else false
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# This is the "Expansion set" for the search: the 10 most relevant terms that
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eset = enquire.eset(10, rset, Filter.new)
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# Print out the results
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eset.terms.each do |res|
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puts "%.2f %s" % [res.weight, res.name[2..-1]]
added
removed
examples/ruby/axi-query-tags.rb
