Add extension method to use automatic application version

Author: patriksvensson

src/Spectre.Console.Cli/ConfiguratorExtensions.cs

@@ -82,7 +82,7 @@ public static IConfigurator SetApplicationName(this IConfigurator configurator,
     }
 
     /// <summary>
-    /// Overrides the auto-detected version of the application.
+    /// Sets the version of the application.
     /// </summary>
     /// <param name="configurator">The configurator.</param>
     /// <param name="version">The version of application.</param>
@@ -98,6 +98,25 @@ public static IConfigurator SetApplicationVersion(this IConfigurator configurato
         return configurator;
     }
 
+    /// <summary>
+    /// Uses the version retrieved from the <see cref="AssemblyInformationalVersionAttribute"/>
+    /// as the application's version.
+    /// </summary>
+    /// <param name="configurator">The configurator.</param>
+    /// <returns>A configurator that can be used to configure the application further.</returns>
+    public static IConfigurator UseAssemblyInformationalVersion(this IConfigurator configurator)
+    {
+        if (configurator == null)
+        {
+            throw new ArgumentNullException(nameof(configurator));
+        }
+
+        configurator.Settings.ApplicationVersion =
+            VersionHelper.GetVersion(Assembly.GetEntryAssembly());
+
+        return configurator;
+    }
+
     /// <summary>
     /// Hides the <c>DEFAULT</c> column that lists default values coming from the
     /// <see cref="DefaultValueAttribute"/> in the options help text.