Custom activation methods

src/Discord.Net.Commands/CommandService.cs

@@ -74,17 +74,50 @@ namespace Discord.Commands
                 string msg = e.Message.RawText;
                 if (msg.Length == 0) return;
 
-				//Check for command char if one is provided
-				var chars = Config.CommandChars;
-                if (chars.Length > 0)
+                bool activated = false; // Either this or nested if statements
+                                        // Also needs a clearer name
+
+                if ((Config.ActivationMode & ActivationMode.Char) != 0)
                 {
-					if (!chars.Contains(msg[0]))
-						return;
-                    msg = msg.Substring(1);
+                    //Check for command char if one is provided
+                    var chars = Config.CommandChars;
+                    if (chars.Length > 0)
+                    {
+                        if (chars.Contains(msg[0]))
+                        {
+                            msg = msg.Substring(1);
+                            activated = true;
+                        }
+                    }
+                }
+
+                if (!activated && (Config.ActivationMode & ActivationMode.Mention) != 0)
+                {
+                    if (e.Message.IsMentioningMe() && msg.StartsWith(e.Server.CurrentUser.Mention))
+                    {
+                        msg = msg.Substring(e.Server.CurrentUser.Mention.Length);
+                        activated = true;
+                    }
+                }
+
+                // Checking if that's null with the Custom flag set on launch and  throwing an
+                // exception (similar to commands with several unparsed parameters) would probably be better than the null check here
+                if (!activated && (Config.ActivationMode & ActivationMode.Custom) != 0 && Config.CustomActivator != null)
+                {
+                    int index = Config.CustomActivator(e.Message);
+                    if (index > 0)
+                    {
+                        msg = msg.Substring(index);
+                        activated = true;
+                    }
                 }
 
-				//Parse command
-				IEnumerable<Command> commands;
+                // This kills trying to parse messages when you don't have a command char set or anything else
+                if (!activated)
+                    return;
+
+                //Parse command
+                IEnumerable<Command> commands;
 				int argPos;
 				CommandParser.ParseCommand(msg, _map, out commands, out argPos);				
 				if (commands == null)

src/Discord.Net.Commands/CommandServiceConfig.cs

@@ -11,6 +11,17 @@ namespace Discord.Commands
 		/// <summary> Use the automatic help command and respond in a private message. </summary>
 		Private
 	}
+    [Flags]
+    public enum ActivationMode
+    {
+        // All of these probably need to be changed
+        /// <summary> Enable command activation by char. </summary>
+        Char = 0x1,
+        /// <summary> Enable command activation when mentioned. </summary>
+        Mention = 0x2,
+        /// <summary> Enable command activation by custom function. </summary>
+        Custom = 0x4
+    }
 	public class CommandServiceConfig
 	{
 		public char? CommandChar
@@ -29,10 +40,16 @@ namespace Discord.Commands
 		}
 		public char[] CommandChars { get { return _commandChars; } set { SetValue(ref _commandChars, value); } }
 		private char[] _commandChars = new char[] { '!' };
+        
+        public Func<Message, int> CustomActivator { get { return _customActivator; } set { SetValue(ref _customActivator, value); } }
+        private Func<Message, int> _customActivator = null;
 
 		public HelpMode HelpMode { get { return _helpMode; } set { SetValue(ref _helpMode, value); } }
 		private HelpMode _helpMode = HelpMode.Disable;
 
+        public ActivationMode ActivationMode { get { return _activationMode; } set { SetValue(ref _activationMode, value); } }
+        private ActivationMode _activationMode = ActivationMode.Char; // Set char as default, not sure if it's the best method of doing it
+
 		//Lock
 		protected bool _isLocked;
 		internal void Lock() { _isLocked = true; }