Added basic help and quit functions to tools.

src/SlatedGameToolkit.Tools/Commands/HelpCommand.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Text;
+using SlatedGameToolkit.Tools.System;
+using SlatedGameToolkit.Tools.System.Interaction;
+
+namespace SlatedGameToolkit.Tools.Commands
+{
+    public class HelpCommand : IInvocable
+    {
+        private readonly string[] invokers = new string[] {"help"};
+        private CommandMap commandMap;
+
+        public HelpCommand(CommandMap commandMap) {
+            this.commandMap = commandMap;
+        }
+
+        public bool Execute(IInteractable interactable, string[] args)
+        {
+            if (args.Length > 0) {
+                IInvocable invocable = commandMap[args[0]];
+                if (invocable == null) interactable.Tell("Unable to find command {0}. Please type \"help\" for more a list of commands.");
+                StringBuilder builder = new StringBuilder();
+                builder.AppendJoin(", ", invocable.GetInvokers());
+                interactable.Tell("Possible aliases: " + builder.ToString() + ": ");
+                interactable.Tell("Description: " + invocable.getDescription());
+                interactable.Tell("Usage: " + invocable.getUsage(args.Length > 0 ? args[0] : null));
+            } else {
+                interactable.Tell("--- Help ---");
+                foreach (IInvocable invocable in commandMap)
+                {
+                    interactable.Separate();
+                    StringBuilder builder = new StringBuilder();
+                    builder.AppendJoin(", ", invocable.GetInvokers());
+                    interactable.Tell(builder.ToString() + ": ");
+                    interactable.Tell(invocable.getDescription());
+                }
+            }
+            return true;
+        }
+
+        public string getDescription()
+        {
+            return "Displays the help message. You're looking at it.";
+        }
+
+        public string getUsage(string arg)
+        {
+            return "Usage: \"help [command]\" where [command] is a specific command you want to see usage for.";
+        }
+
+        public string[] GetInvokers()
+        {
+            return invokers;
+        }
+    }
+}