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diff --git a/src/CommandListBuilder.hxx b/src/CommandListBuilder.hxx
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+++ b/src/CommandListBuilder.hxx
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+/*
+ * Copyright (C) 2003-2013 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.
+ */
+
+#ifndef MPD_COMMAND_LIST_BUILDER_HXX
+#define MPD_COMMAND_LIST_BUILDER_HXX
+
+#include <list>
+#include <string>
+
+#include <assert.h>
+
+class CommandListBuilder {
+	/**
+	 * print OK after each command execution
+	 */
+	enum class Mode {
+		/**
+		 * Not active.
+		 */
+		DISABLED = -1,
+
+		/**
+		 * Enabled in normal list mode.
+		 */
+		ENABLED = false,
+
+		/**
+		 * Enabled in "list_OK" mode.
+		 */
+		OK = true,
+	} mode;
+
+	/**
+	 * for when in list mode
+	 */
+	std::list<std::string> list;
+
+	/**
+	 * Memory consumed by the list.
+	 */
+	size_t size;
+
+public:
+	CommandListBuilder()
+		:mode(Mode::DISABLED), size(0) {}
+
+	/**
+	 * Is a command list currently being built?
+	 */
+	bool IsActive() const {
+		return mode != Mode::DISABLED;
+	}
+
+	/**
+	 * Is the object in "list_OK" mode?
+	 */
+	bool IsOKMode() const {
+		assert(IsActive());
+
+		return (bool)mode;
+	}
+
+	/**
+	 * Reset the object: delete the list and clear the mode.
+	 */
+	void Reset();
+
+	/**
+	 * Begin building a command list.
+	 */
+	void Begin(bool ok) {
+		assert(list.empty());
+		assert(mode == Mode::DISABLED);
+
+		mode = (Mode)ok;
+	}
+
+	/**
+	 * @return false if the list is full
+	 */
+	bool Add(const char *cmd);
+
+	/**
+	 * Finishes the list and returns it.
+	 */
+	std::list<std::string> &&Commit() {
+		assert(IsActive());
+
+		return std::move(list);
+	}
+};
+
+#endif