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diff --git a/src/qmmpui/commandlinehandler.h b/src/qmmpui/commandlinehandler.h
new file mode 100644
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+++ b/src/qmmpui/commandlinehandler.h
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+/***************************************************************************
+ *   Copyright (C) 2008-2018 by Ilya Kotov                                 *
+ *   forkotov02@ya.ru                                                      *
+ *                                                                         *
+ *   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 COMMANDLINEHANDLER_H
+#define COMMANDLINEHANDLER_H
+
+#include <QString>
+#include <QMap>
+#include <QStringList>
+#include <QtPlugin>
+#include "qmmpui_export.h"
+
+
+class CommandLineManager;
+class QString;
+class QObject;
+class QStringList;
+
+
+/*! @brief Abstract base class of the command line plugins.
+ * @author Vladimir Kuznetsov <vovanec@gmail.ru>
+ */
+class QMMPUI_EXPORT CommandLineHandler
+{
+public:
+    /*!
+     * Object destructor
+     */
+    virtual ~CommandLineHandler() {}
+    /*!
+     * Returns command line plugin short name for internal usage.
+     * Subclass should reimplement this function.
+     */
+    virtual QString shortName() const = 0;
+    /*!
+     * Returns translation file path without locale code and extension.
+     * Subclass should reimplement this function.
+     */
+    virtual QString translation() const = 0;
+    /*!
+     * Executes given command.
+     * Subclass should reimplement this function.
+     * @param id Command id to execute
+     * @param args Command arguments
+     * @return Command output
+     */
+    virtual QString executeCommand(int id, const QStringList &args) = 0;
+
+    QStringList helpString() const;
+    int identify(const QString &name) const;
+
+protected:
+    void registerOption(int id, const QStringList &names, const QString &helpString);
+    void registerOption(int id, const QStringList &names, const QStringList &values, const QString &helpString);
+
+private:
+    struct CommandLineOption
+    {
+        QStringList names;
+        QStringList values;
+        QString helpString;
+
+        inline bool operator == (const CommandLineOption &opt) const
+        {
+            return names == opt.names &&
+                    values == opt.values &&
+                    helpString == opt.helpString;
+        }
+    };
+
+    QMap<int, CommandLineOption> m_options;
+};
+
+Q_DECLARE_INTERFACE(CommandLineHandler,"CommandLineHandlerInterface/1.0")
+
+#endif