DatabasePrint: move PrintSongCount() to Count.cxx

src/db/Count.cxx

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "Count.hxx"
+#include "Selection.hxx"
+#include "Interface.hxx"
+#include "client/Client.hxx"
+#include "LightSong.hxx"
+
+#include <functional>
+
+struct SearchStats {
+	unsigned n_songs;
+	unsigned long total_time_s;
+};
+
+static void
+PrintSearchStats(Client &client, const SearchStats &stats)
+{
+	client_printf(client,
+		      "songs: %u\n"
+		      "playtime: %lu\n",
+		      stats.n_songs, stats.total_time_s);
+}
+
+static bool
+stats_visitor_song(SearchStats &stats, const LightSong &song)
+{
+	stats.n_songs++;
+	stats.total_time_s += song.GetDuration();
+
+	return true;
+}
+
+bool
+PrintSongCount(Client &client, const char *name,
+	       const SongFilter *filter,
+	       Error &error)
+{
+	const Database *db = client.GetDatabase(error);
+	if (db == nullptr)
+		return false;
+
+	const DatabaseSelection selection(name, true, filter);
+
+	SearchStats stats;
+	stats.n_songs = 0;
+	stats.total_time_s = 0;
+
+	using namespace std::placeholders;
+	const auto f = std::bind(stats_visitor_song, std::ref(stats),
+				 _1);
+	if (!db->Visit(selection, f, error))
+		return false;
+
+	PrintSearchStats(client, stats);
+	return true;
+}