Print errors from local log to chat

src/game.cpp

@@ -49,6 +49,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "main.h" // For g_settings
 #include "tooldef.h"
 #include "tile.h" // For TextureSource
+#include "logoutputbuffer.h"
 
 /*
 	Setting this to 1 enables a special camera mode that forces
@@ -642,6 +643,9 @@ void the_game(
 	// Create node definition manager
 	IWritableNodeDefManager *nodedef = createNodeDefManager();
 
+	// Add chat log output for errors to be shown in chat
+	LogOutputBuffer chat_log_error_buf(LMT_ERROR);
+
 	/*
 		Create server.
 		SharedPtr will delete it when it goes out of scope.
@@ -2122,7 +2126,13 @@ void the_game(
 			Get chat messages from client
 		*/
 		{
-			// Get new messages
+			// Get new messages from error log buffer
+			while(!chat_log_error_buf.empty())
+			{
+				chat_lines.push_back(ChatLine(narrow_to_wide(
+						chat_log_error_buf.get())));
+			}
+			// Get new messages from client
 			std::wstring message;
 			while(client.getChatMessage(message))
 			{

src/logoutputbuffer.h

@@ -0,0 +1,58 @@
+/*
+Minetest-c55
+Copyright (C) 2011 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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 LOGOUTPUTBUFFER_HEADER
+#define LOGOUTPUTBUFFER_HEADER
+
+#include "log.h"
+#include <queue>
+
+class LogOutputBuffer : public ILogOutput
+{
+public:
+	LogOutputBuffer(LogMessageLevel maxlev)
+	{
+		log_add_output(this, maxlev);
+	}
+	~LogOutputBuffer()
+	{
+		log_remove_output(this);
+	}
+	virtual void printLog(const std::string &line)
+	{
+		m_buf.push(line);
+	}
+	std::string get()
+	{
+		if(empty())
+			return "";
+		std::string s = m_buf.front();
+		m_buf.pop();
+		return s;
+	}
+	bool empty()
+	{
+		return m_buf.empty();
+	}
+private:
+	std::queue<std::string> m_buf;
+};
+
+#endif
+