Add ICommands.HasCommand() method so that we can detect whether a command has already been registered without needing to also run it

OpenSim/Framework/Console/CommandConsole.cs

@@ -424,9 +424,9 @@ namespace OpenSim.Framework.Console
             return new string[] { new List<string>(current.Keys)[0] };
         }
 
-        public string[] Resolve(string[] cmd)
+        private CommandInfo ResolveCommand(string[] cmd, out string[] result)
         {
-            string[] result = cmd;
+            result = cmd;
             int index = -1;
 
             Dictionary<string, object> current = tree;
@@ -458,7 +458,7 @@ namespace OpenSim.Framework.Console
                 }
                 else if (found.Count > 0)
                 {
-                    return new string[0];
+                    return null;
                 }
                 else
                 {
@@ -467,10 +467,28 @@ namespace OpenSim.Framework.Console
             }
 
             if (current.ContainsKey(String.Empty))
+                return (CommandInfo)current[String.Empty];
+
+            return null;
+        }
+                
+        public bool HasCommand(string command)
         {
-                CommandInfo ci = (CommandInfo)current[String.Empty];
+            string[] result;
+            return ResolveCommand(Parser.Parse(command), out result) != null;
+        }
+
+        public string[] Resolve(string[] cmd)
+        {
+            string[] result;
+            CommandInfo ci = ResolveCommand(cmd, out result);
+
+            if (ci == null)
+                return new string[0];
+
             if (ci.fn.Count == 0)
                 return new string[0];
+
             foreach (CommandDelegate fn in ci.fn)
             {
                 if (fn != null)
@@ -478,10 +496,8 @@ namespace OpenSim.Framework.Console
                 else
                     return new string[0];
             }
-                return result;
-            }
 
-            return new string[0];
+            return result;
         }
 
         public XmlElement GetXml(XmlDocument doc)

OpenSim/Framework/Console/MockConsole.cs

@@ -82,6 +82,7 @@ namespace OpenSim.Framework.Console
         public void AddCommand(string module, bool shared, string command, string help, string longhelp, CommandDelegate fn) {}
         public void AddCommand(string module, bool shared, string command, string help, string longhelp, string descriptivehelp, CommandDelegate fn) {}
         public string[] FindNextOption(string[] cmd, bool term) { return null; }
+        public bool HasCommand(string cmd) { return false; }
         public string[] Resolve(string[] cmd) { return null; }
         public XmlElement GetXml(XmlDocument doc) { return null; }
     }

OpenSim/Framework/ICommandConsole.cs

@@ -67,9 +67,11 @@ namespace OpenSim.Framework
                 string help, string longhelp, string descriptivehelp,
                 CommandDelegate fn);
 
-        string[] FindNextOption(string[] cmd, bool term);
+        bool HasCommand(string command);
 
-        string[] Resolve(string[] cmd);
+        string[] FindNextOption(string[] command, bool term);
+
+        string[] Resolve(string[] command);
 
         XmlElement GetXml(XmlDocument doc);
     }

OpenSim/Services/GridService/GridService.cs

@@ -96,7 +96,7 @@ namespace OpenSim.Services.GridService
                     // has an identically named command
                     //
                     // XXX: We're relying on the OpenSimulator version being registered first, which is not well defined.
-                    if (MainConsole.Instance.Commands.Resolve(new string[] { "show", "regions" }).Length == 0)
+                    if (!MainConsole.Instance.Commands.HasCommand("show regions"))
                         MainConsole.Instance.Commands.AddCommand("Regions", true,
                                 "show regions",
                                 "show regions",