stats: convert to C++

src/Stats.cxx

@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2003-2011 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"
+
+extern "C" {
+#include "stats.h"
+#include "database.h"
+#include "db_selection.h"
+#include "tag.h"
+#include "song.h"
+#include "client.h"
+#include "player_control.h"
+#include "strset.h"
+#include "client_internal.h"
+}
+
+#include "DatabaseGlue.hxx"
+#include "DatabasePlugin.hxx"
+
+#include <functional>
+#include <set>
+
+struct stats stats;
+
+void stats_global_init(void)
+{
+	stats.timer = g_timer_new();
+}
+
+void stats_global_finish(void)
+{
+	g_timer_destroy(stats.timer);
+}
+
+struct StringLess {
+	gcc_pure
+	bool operator()(const char *a, const char *b) const {
+		return strcmp(a, b) < 0;
+	}
+};
+
+typedef std::set<const char *, StringLess> StringSet;
+
+static void
+visit_tag(StringSet &artists, StringSet &albums, const struct tag *tag)
+{
+	if (tag->time > 0)
+		stats.song_duration += tag->time;
+
+	for (unsigned i = 0; i < tag->num_items; ++i) {
+		const struct tag_item *item = tag->items[i];
+
+		switch (item->type) {
+		case TAG_ARTIST:
+			artists.insert(item->value);
+			break;
+
+		case TAG_ALBUM:
+			albums.insert(item->value);
+			break;
+
+		default:
+			break;
+		}
+	}
+}
+
+static bool
+collect_stats_song(StringSet &artists, StringSet &albums, struct song *song)
+{
+	++stats.song_count;
+
+	if (song->tag != NULL)
+		visit_tag(artists, albums, song->tag);
+
+	return true;
+}
+
+void stats_update(void)
+{
+	stats.song_count = 0;
+	stats.song_duration = 0;
+	stats.artist_count = 0;
+
+	struct db_selection selection;
+	db_selection_init(&selection, "", true);
+
+	StringSet artists, albums;
+	using namespace std::placeholders;
+	const auto f = std::bind(collect_stats_song,
+				 std::ref(artists), std::ref(albums), _1);
+	GetDatabase()->Visit(&selection, f, NULL);
+
+	stats.artist_count = artists.size();
+	stats.album_count = albums.size();
+}
+
+int stats_print(struct client *client)
+{
+	client_printf(client,
+		      "artists: %u\n"
+		      "albums: %u\n"
+		      "songs: %i\n"
+		      "uptime: %li\n"
+		      "playtime: %li\n"
+		      "db_playtime: %li\n"
+		      "db_update: %li\n",
+		      stats.artist_count,
+		      stats.album_count,
+		      stats.song_count,
+		      (long)g_timer_elapsed(stats.timer, NULL),
+		      (long)(pc_get_total_play_time(client->player_control) + 0.5),
+		      stats.song_duration,
+		      (long)db_get_mtime());
+	return 0;
+}