opensim/OpenSim/Framework/Console/OpenSimAppender.cs

/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*     * Redistributions of source code must retain the above copyright
*       notice, this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright
*       notice, this list of conditions and the following disclaimer in the
*       documentation and/or other materials provided with the distribution.
*     * Neither the name of the OpenSim Project nor the
*       names of its contributors may be used to endorse or promote products
*       derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* 
*/

using System;
using System.Text;
using System.Text.RegularExpressions;
using System.Globalization;

using log4net.Core;
using log4net.Layout;
using log4net.Appender;
using log4net.Util;

namespace OpenSim.Framework.Console
{
    public class OpenSimAppender : AnsiColorTerminalAppender
    {
        override protected void Append(LoggingEvent le)
        {
            try {
                string loggingMessage = RenderLoggingEvent(le);
                string regex = @"^(?<Front>.*?)\[(?<Category>[^\]]+)\]:?(?<End>.*)";
                
                Regex RE = new Regex(regex, RegexOptions.Multiline);
                MatchCollection matches = RE.Matches(loggingMessage);
                // Get some direct matches $1 $4 is a 
                if (matches.Count == 1)
                {
                    System.Console.Write(matches[0].Groups["Front"].Value);
                    System.Console.Write("[");
                    
                    WriteColorText(DeriveColor(matches[0].Groups["Category"].Value), matches[0].Groups["Category"].Value);
                    System.Console.Write("]:");
                    
                    if (le.Level == Level.Error) 
                    {
                        WriteColorText(ConsoleColor.Red, matches[0].Groups["End"].Value);
                    }
                    else if (le.Level == Level.Warn) 
                    {
                        WriteColorText(ConsoleColor.Yellow, matches[0].Groups["End"].Value);
                    }
                    else 
                    {
                        System.Console.Write(matches[0].Groups["End"].Value);
                    }
                    System.Console.WriteLine();
                } 
                else
                {
                    System.Console.Write(loggingMessage);
                }
            }
            catch (Exception e)
            {
                System.Console.WriteLine("Couldn't write out log message", e.ToString());
            }
        }

        private void WriteColorText(ConsoleColor color, string sender)
        {
            try
            {
                lock (this)
                {
                    try
                    {
                        System.Console.ForegroundColor = color;
                        System.Console.Write(sender);
                        System.Console.ResetColor();
                    }
                    catch (ArgumentNullException)
                    {
                        // Some older systems dont support coloured text.
                        System.Console.WriteLine(sender);
                    }
                }
            }
            catch (ObjectDisposedException)
            {
            }
        }

        private ConsoleColor DeriveColor(string input)
        {
            int colIdx = (input.ToUpper().GetHashCode() % 6) + 9;
            return (ConsoleColor) colIdx;
        }
    }
}