50 lines
1.9 KiB
C++
50 lines
1.9 KiB
C++
/* vim: set sw=4 sts=4 et foldmethod=syntax : */
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/*
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* Copyright (c) 2010, 2011 Ciaran McCreesh
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*
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* This file is part of the Paludis package manager. Paludis is free software;
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* you can redistribute it and/or modify it under the terms of the GNU General
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* Public License version 2, as published by the Free Software Foundation.
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*
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* Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <paludis/resolver/collect_purges.hh>
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#include <paludis/resolver/collect_world.hh>
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#include <paludis/resolver/accumulate_deps.hh>
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#include <paludis/util/set.hh>
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#include <paludis/util/sequence.hh>
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#include <paludis/util/wrapped_forward_iterator.hh>
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#include <paludis/util/wrapped_output_iterator.hh>
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#include <paludis/package_id.hh>
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#include <algorithm>
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using namespace paludis;
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using namespace paludis::resolver;
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const std::shared_ptr<PackageIDSet>
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paludis::resolver::collect_purges(
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const Environment * const env,
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const std::shared_ptr<const PackageIDSet> & have_now,
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const std::shared_ptr<const PackageIDSequence> & have_now_seq,
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const std::function<void ()> & step)
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{
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const std::shared_ptr<const PackageIDSet> world(collect_world(env, have_now));
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const std::shared_ptr<const PackageIDSet> world_plus_deps(accumulate_deps(env, world, have_now_seq, true, step));
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const std::shared_ptr<PackageIDSet> unused(std::make_shared<PackageIDSet>());
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std::set_difference(have_now->begin(), have_now->end(),
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world_plus_deps->begin(), world_plus_deps->end(), unused->inserter(), PackageIDSetComparator());
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return unused;
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}
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