Backup old MotD and convert it to using Terraria chat tags automatically, then write it back out to the MotD file.

TShockAPI/TShock.cs

@@ -837,6 +837,8 @@ namespace TShockAPI
 			ComputeMaxStyles();
 			FixChestStacks();
 
+			Utils.UpgradeMotD();
+
 			if (Config.UseServerName)
 			{
 				Main.worldName = Config.ServerName;

TShockAPI/Utils.cs

@@ -725,8 +725,10 @@ namespace TShockAPI
 												Int32.Parse(legacyColorMatch.Groups["b"].Value));
 						foo = foo.Replace(legacyColorMatch.Groups[0].Value, "");
 					}
-					string newFoo = ReplaceDeprecatedColorCodes(foo);
+
-					if (newFoo != foo && !containsOldFormat)
+					bool upgraded = false;
+					string newFoo = ReplaceDeprecatedColorCodes(foo, out upgraded);
+					if (upgraded && !containsOldFormat)
 					{
 						TShock.Log.ConsoleInfo($"You are using an old color format in file {file}.");
 						TShock.Log.ConsoleInfo("To send coloured text please use Terraria's inbuilt format of: [c/#hex:text].");
@@ -744,20 +746,69 @@ namespace TShockAPI
 		/// Returns a string with deprecated %###,###,###% formats replaced with the new chat format colors.
 		/// </summary>
 		/// <param name="input">The input string</param>
+		/// <param name="upgradedFormat">An out parameter that denotes if this line of text was upgraded.</param>
 		/// <returns>A replaced version of the input with the new chat color format.</returns>
-		private string ReplaceDeprecatedColorCodes(string input)
+		private string ReplaceDeprecatedColorCodes(string input, out bool upgradedFormat)
 		{
 			String tempString = input;
 			Match match = null;
+			bool uFormat = false;
 
 			while ((match = motdColorRegex.Match(tempString)).Success)
 			{
+				uFormat = true;
 				tempString = tempString.Replace(match.Groups[0].Value, String.Format("[c/{0:X2}{1:X2}{2:X2}:{3}]", Int32.Parse(match.Groups["r"].Value), Int32.Parse(match.Groups["g"].Value), Int32.Parse(match.Groups["b"].Value), match.Groups["text"]));
 			}
 
+			upgradedFormat = uFormat;
 			return tempString;
 		}
 
+		/// <summary>
+		/// Upgrades a legacy MotD file to the new terraria chat tags version.
+		/// </summary>
+		public void UpgradeMotD()
+		{
+			string foo = "";
+			StringBuilder motd = new StringBuilder();
+			bool informedOwner = false;
+			using (var tr = new StreamReader(FileTools.MotdPath))
+			{
+				Color lineColor;
+				while ((foo = tr.ReadLine()) != null)
+				{
+					lineColor = Color.White;
+					var legacyColorMatch = startOfLineColorRegex.Match(foo);
+					if (legacyColorMatch.Success)
+					{
+						lineColor = new Color(Int32.Parse(legacyColorMatch.Groups["r"].Value),
+												Int32.Parse(legacyColorMatch.Groups["g"].Value),
+												Int32.Parse(legacyColorMatch.Groups["b"].Value));
+						foo = foo.Replace(legacyColorMatch.Groups[0].Value, "");
+					}
+
+					bool upgraded = false;
+					string newFoo = ReplaceDeprecatedColorCodes(foo, out upgraded);
+					if (!informedOwner && upgraded)
+					{
+						informedOwner = true;
+						TShock.Log.ConsoleInfo("We have upgraded your MotD to the new format.  A backup has been created.");
+					}
+
+					if (lineColor != Color.White)
+						motd.Append(String.Format("%{0:d3},{1:d3},{2:d3}%", lineColor.R, lineColor.G, lineColor.B));
+
+					motd.AppendLine(newFoo);
+				}
+			}
+
+			if (informedOwner)
+			{
+				File.Copy(FileTools.MotdPath, String.Format("{0}_{1}.backup", FileTools.MotdPath, DateTime.Now.ToString("ddMMMyy_hhmmss")));
+				File.WriteAllText(FileTools.MotdPath, motd.ToString());
+			}
+		}
+
 		/// <summary>
 		/// Returns a Group from the name of the group
 		/// </summary>