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diff --git a/src/logger.h b/src/logger.h
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+++ b/src/logger.h
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+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2004-2009  The Mana World Development Team
+ *  Copyright (C) 2009-2010  The Mana Developers
+ *  Copyright (C) 2011  The ManaPlus Developers
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  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
+ *  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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef M_LOG_H
+#define M_LOG_H
+
+#include "main.h"
+#include <fstream>
+
+class ChatWindow;
+
+#ifdef ENABLEDEBUGLOG
+#define DEBUGLOG(msg) logger->dlog(msg)
+#else
+#define DEBUGLOG(msg) {}
+#endif
+
+/**
+ * The Log Class : Useful to write debug or info messages
+ */
+class Logger
+{
+    public:
+        /**
+         * Constructor.
+         */
+        Logger();
+
+        /**
+         * Destructor, closes log file.
+         */
+        ~Logger();
+
+        /**
+         * Sets the file to log to and opens it
+         */
+        void setLogFile(const std::string &logFilename);
+
+        /**
+         * Sets whether the log should be written to standard output.
+         */
+        void setLogToStandardOut(bool value) { mLogToStandardOut = value; }
+
+        /**
+         * Enables logging to chat window
+         */
+        void setChatWindow(ChatWindow *window) { mChatWindow = window; }
+
+        /**
+         * Enters a message in the log. The message will be timestamped.
+         */
+        void log(const char *log_text, ...)
+#ifdef __GNUC__
+            __attribute__((__format__(__printf__, 2, 3)))
+#endif
+            ;
+
+        /**
+         * Enters a message in the log. The message will be timestamped.
+         */
+        void log1(const char *log_text);
+
+        /**
+         * Enters a message in the log. The message will be timestamped.
+         */
+        void log(std::string str);
+
+        /**
+         * Enters debug message in the log. The message will be timestamped.
+         */
+        void dlog(std::string str);
+
+        void setDebugLog(bool n)
+        { mDebugLog = n; }
+
+        /**
+         * Log an error and quit. The error will pop-up on Windows and Mac, and
+         * will be printed to standard error everywhere else.
+         */
+        void error(const std::string &error_text) __attribute__ ((noreturn));
+
+    private:
+        std::ofstream mLogFile;
+        bool mLogToStandardOut;
+        ChatWindow *mChatWindow;
+        bool mDebugLog;
+};
+
+extern Logger *logger;
+
+#endif