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diff --git a/paludis/repositories/e/e_keywords_key.cc b/paludis/repositories/e/e_keywords_key.cc
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+/* vim: set sw=4 sts=4 et foldmethod=syntax : */
+
+/*
+ * Copyright (c) 2011 Ciaran McCreesh
+ *
+ * This file is part of the Paludis package manager. Paludis is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU General
+ * Public License version 2, as published by the Free Software Foundation.
+ *
+ * Paludis 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
+ */
+
+#include <paludis/repositories/e/e_keywords_key.hh>
+#include <paludis/repositories/e/eapi.hh>
+
+#include <paludis/util/singleton-impl.hh>
+#include <paludis/util/hashes.hh>
+#include <paludis/util/singleton-impl.hh>
+#include <paludis/util/pimp-impl.hh>
+#include <paludis/util/join.hh>
+#include <paludis/util/wrapped_output_iterator.hh>
+#include <paludis/util/tokeniser.hh>
+#include <paludis/util/create_iterator-impl.hh>
+
+#include <paludis/name.hh>
+#include <paludis/pretty_printer.hh>
+#include <paludis/call_pretty_printer.hh>
+
+#include <tuple>
+#include <unordered_map>
+#include <algorithm>
+
+using namespace paludis;
+using namespace paludis::erepository;
+
+namespace
+{
+ struct EKeywordsKey :
+ MetadataCollectionKey<Set<KeywordName> >
+ {
+ const std::shared_ptr<const Set<KeywordName> > parsed_value;
+ const std::shared_ptr<const EAPIMetadataVariable> variable;
+ const MetadataKeyType key_type;
+
+ EKeywordsKey(
+ const std::shared_ptr<const Set<KeywordName> > & v,
+ const std::shared_ptr<const EAPIMetadataVariable> & m,
+ const MetadataKeyType t) :
+ parsed_value(v),
+ variable(m),
+ key_type(t)
+ {
+ }
+
+ ~EKeywordsKey()
+ {
+ }
+
+ const std::shared_ptr<const Set<KeywordName> > value() const
+ {
+ return parsed_value;
+ }
+
+ const std::string raw_name() const
+ {
+ return variable->name();
+ }
+
+ const std::string human_name() const
+ {
+ return variable->description();
+ }
+
+ virtual MetadataKeyType type() const
+ {
+ return key_type;
+ }
+
+ virtual const std::string pretty_print_value(
+ const PrettyPrinter & p,
+ const PrettyPrintOptions &) const
+ {
+ return join(value()->begin(), value()->end(), " ", CallPrettyPrinter(p));
+ }
+ };
+
+ typedef std::tuple<std::shared_ptr<const EAPIMetadataVariable>, std::shared_ptr<const Set<KeywordName> >, MetadataKeyType> EKeywordsKeyStoreIndex;
+
+ long hash_set(const std::shared_ptr<const Set<KeywordName> > & v)
+ {
+ int result(0);
+ for (auto s(v->begin()), s_end(v->end()) ;
+ s != s_end ; ++s)
+ result = (result << 4) ^ Hash<std::string>()(stringify(*s));
+ return result;
+ }
+
+ struct EKeywordsKeyHash
+ {
+ std::size_t operator() (const EKeywordsKeyStoreIndex & p) const
+ {
+ return
+ Hash<std::string>()(std::get<0>(p)->description()) ^
+ std::get<0>(p)->flat_list_index() ^
+ Hash<std::string>()(std::get<0>(p)->name()) ^
+ hash_set(std::get<1>(p)) ^
+ static_cast<int>(std::get<2>(p));
+ }
+ };
+
+ struct EKeywordsKeyStoreCompare
+ {
+ bool operator() (const EKeywordsKeyStoreIndex & a, const EKeywordsKeyStoreIndex & b) const
+ {
+ return std::get<0>(a) == std::get<0>(b) && std::get<2>(a) == std::get<2>(b) &&
+ std::get<1>(a)->size() == std::get<1>(b)->size() &&
+ std::get<1>(a)->end() == std::mismatch(std::get<1>(a)->begin(), std::get<1>(a)->end(), std::get<1>(b)->begin()).first;
+ }
+ };
+}
+
+namespace paludis
+{
+ template <>
+ struct Imp<EKeywordsKeyStore>
+ {
+ mutable Mutex mutex;
+ mutable std::unordered_map<EKeywordsKeyStoreIndex, std::shared_ptr<const EKeywordsKey>, EKeywordsKeyHash, EKeywordsKeyStoreCompare> store;
+ };
+}
+
+EKeywordsKeyStore::EKeywordsKeyStore() :
+ Pimp<EKeywordsKeyStore>()
+{
+}
+
+EKeywordsKeyStore::~EKeywordsKeyStore() = default;
+
+const std::shared_ptr<const MetadataCollectionKey<Set<KeywordName> > >
+EKeywordsKeyStore::fetch(
+ const std::shared_ptr<const EAPIMetadataVariable> & v,
+ const std::string & s,
+ const MetadataKeyType t) const
+{
+ Lock lock(_imp->mutex);
+
+ auto k(std::make_shared<Set<KeywordName> >());
+ tokenise_whitespace(s, create_inserter<KeywordName>(k->inserter()));
+
+ EKeywordsKeyStoreIndex x(v, k, t);
+ auto i(_imp->store.find(x));
+ if (i == _imp->store.end())
+ i = _imp->store.insert(std::make_pair(x, std::make_shared<const EKeywordsKey>(k, v, t))).first;
+ return i->second;
+}
+