From d1ccfad2ae6c7ec658b05c947667c9f9f09ef91c Mon Sep 17 00:00:00 2001
From: Tony Bark <noreply@tonybark.com>
Date: Tue, 30 Mar 2021 10:01:34 -0400
Subject: [PATCH] Catch wrong commands.

---
 src/Tomas.Kernel/Kernel.cs    | 12 +++++++++---
 src/Tomas.Terminal/Program.cs | 14 +++++++++++---
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/src/Tomas.Kernel/Kernel.cs b/src/Tomas.Kernel/Kernel.cs
index 0d7c5b9..cdebb47 100644
--- a/src/Tomas.Kernel/Kernel.cs
+++ b/src/Tomas.Kernel/Kernel.cs
@@ -35,10 +35,16 @@ namespace Tomas.Kernel
             {
                 var shell = new Shell();
                 var command = shell.ReadLine;
-                OSConsts.Programs.TryGetValue(command, out var program);
-                var isRun = program.Start();
 
-                if (isRun) continue;
+                if (!OSConsts.Programs.TryGetValue(command, out var program))
+                {
+                    Console.WriteLine("Command Unknown.");
+                    continue;
+                }
+
+                var start = program.Start();
+                if (start) continue;
+
                 break;
             }
         }
diff --git a/src/Tomas.Terminal/Program.cs b/src/Tomas.Terminal/Program.cs
index 76a5591..d9e50a1 100644
--- a/src/Tomas.Terminal/Program.cs
+++ b/src/Tomas.Terminal/Program.cs
@@ -1,5 +1,7 @@
 // I license this project under the GPL 3.0 license.
 // See the LICENSE file in the project root for more information.
+using System;
+
 namespace Tomas.Terminal
 {
     class Program
@@ -10,10 +12,16 @@ namespace Tomas.Terminal
             {
                 var shell = new Shell();
                 var command = shell.ReadLine;
-                TermConsts.Programs.TryGetValue(command, out var program);
-                var isRun = program.Start();
 
-                if (isRun) continue;
+                if (!TermConsts.Programs.TryGetValue(command, out var program))
+                {
+                    Console.WriteLine("Command Unknown.");
+                    continue;
+                }
+
+                var start = program.Start();
+                if (start) continue;
+
                 break;
             }
         }