Merge pull request gui-cs#3843 from tig/v2_3841-ConfigManager

Fixes gui-cs#3841 - `ConfigurationManager` not loading correctly

Example/Example.cs

@@ -6,6 +6,9 @@
 using System;
 using Terminal.Gui;
 
+// Override the default configuraiton for the application to use the Light theme
+ConfigurationManager.RuntimeConfig = """{ "Theme": "Light" }""";
+
 Application.Run<ExampleWindow> ().Dispose ();
 
 // Before the application exits, reset Terminal.Gui for clean shutdown

Terminal.Gui/Application/Application.Initialization.cs

@@ -86,12 +86,14 @@ internal static void InternalInit (
                 // We're running unit tests. Disable loading config files other than default
                 if (Locations == ConfigLocations.All)
                 {
-                    Locations = ConfigLocations.DefaultOnly;
+                    Locations = ConfigLocations.Default;
                     Reset ();
                 }
             }
         }
 
+        AddApplicationKeyBindings ();
+
         // Start the process of configuration management.
         // Note that we end up calling LoadConfigurationFromAllSources
         // multiple times. We need to do this because some settings are only
@@ -106,8 +108,6 @@ internal static void InternalInit (
         }
         Apply ();
 
-        AddApplicationKeyBindings ();
-
         // Ignore Configuration for ForceDriver if driverName is specified
         if (!string.IsNullOrEmpty (driverName))
         {

Terminal.Gui/Application/Application.Keyboard.cs

@@ -290,7 +290,15 @@ private static void ReplaceKey (Key oldKey, Key newKey)
         }
         else
         {
-            KeyBindings.ReplaceKey (oldKey, newKey);
+            if (KeyBindings.TryGet(oldKey, out KeyBinding binding))
+            {
+                KeyBindings.Remove (oldKey);
+                KeyBindings.Add (newKey, binding);
+            }
+            else
+            {
+                KeyBindings.Add (newKey, binding);
+            }
         }
     }
 

Terminal.Gui/Application/Application.Run.cs

@@ -1,6 +1,7 @@
 #nullable enable
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
+using System.Text.Json.Serialization;
 using Microsoft.CodeAnalysis.Diagnostics;
 
 namespace Terminal.Gui;

Terminal.Gui/Configuration/ConfigLocations.cs

@@ -0,0 +1,57 @@
+#nullable enable
+namespace Terminal.Gui;
+
+/// <summary>
+///     Describes the location of the configuration files. The constants can be combined (bitwise) to specify multiple
+///     locations. The more significant the bit, the higher the priority meaning that the last location will override the
+///     earlier ones.
+/// </summary>
+
+[Flags]
+public enum ConfigLocations
+{
+    /// <summary>No configuration will be loaded.</summary>
+    /// <remarks>
+    ///     Used for development and testing only. For Terminal,Gui to function properly, at least
+    ///     <see cref="Default"/> should be set.
+    /// </remarks>
+    None = 0,
+
+    /// <summary>
+    ///    Deafult configuration in <c>Terminal.Gui.dll</c>'s resources (<c>Terminal.Gui.Resources.config.json</c>).
+    /// </summary>
+    Default = 0b_0000_0001,
+
+    /// <summary>
+    ///     Global settings in the current directory (e.g. <c>./.tui/config.json</c>).
+    /// </summary>
+    GlobalCurrent = 0b_0000_0010,
+
+    /// <summary>
+    ///    Global settings in the home directory (e.g. <c>~/.tui/config.json</c>).
+    /// </summary>
+    GlobalHome = 0b_0000_0100,
+
+    /// <summary>
+    ///     App resources (e.g. <c>MyApp.Resources.config.json</c>).
+    /// </summary>
+    AppResources = 0b_0000_1000,
+
+    /// <summary>
+    ///     App settings in the current directory (e.g. <c>./.tui/MyApp.config.json</c>).
+    /// </summary>
+    AppCurrent = 0b_0001_0000,
+
+    /// <summary>
+    ///     App settings in the home directory (e.g. <c>~/.tui/MyApp.config.json</c>).
+    /// </summary>
+    AppHome = 0b_0010_0000,
+
+    /// <summary>
+    ///     Settings in the <see cref="ConfigurationManager.RuntimeConfig"/> static property.
+    /// </summary>
+    Runtime = 0b_0100_0000,
+
+    /// <summary>This constant is a combination of all locations</summary>
+    All = 0b_1111_1111
+}

Terminal.Gui/Configuration/ConfigProperty.cs

@@ -31,44 +31,42 @@ public class ConfigProperty
     /// </remarks>
     public object? PropertyValue { get; set; }
 
-    /// <summary>Applies the <see cref="PropertyValue"/> to the property described by <see cref="PropertyInfo"/>.</summary>
+    /// <summary>Applies the <see cref="PropertyValue"/> to the static property described by <see cref="PropertyInfo"/>.</summary>
     /// <returns></returns>
     public bool Apply ()
     {
-        if (PropertyValue is { })
+        try
         {
-            try
+            if (PropertyInfo?.GetValue (null) is { })
             {
-                if (PropertyInfo?.GetValue (null) is { })
-                {
-                    PropertyInfo?.SetValue (null, DeepMemberWiseCopy (PropertyValue, PropertyInfo?.GetValue (null)));
-                }
+                var val = DeepMemberWiseCopy (PropertyValue, PropertyInfo?.GetValue (null));
+                PropertyInfo?.SetValue (null, val);
             }
-            catch (TargetInvocationException tie)
+        }
+        catch (TargetInvocationException tie)
+        {
+            // Check if there is an inner exception
+            if (tie.InnerException is { })
             {
-                // Check if there is an inner exception
-                if (tie.InnerException is { })
-                {
-                    // Handle the inner exception separately without catching the outer exception
-                    Exception? innerException = tie.InnerException;
+                // Handle the inner exception separately without catching the outer exception
+                Exception? innerException = tie.InnerException;
 
-                    // Handle the inner exception here
-                    throw new JsonException (
-                                             $"Error Applying Configuration Change: {innerException.Message}",
-                                             innerException
-                                            );
-                }
-
-                // Handle the outer exception or rethrow it if needed
-                throw new JsonException ($"Error Applying Configuration Change: {tie.Message}", tie);
-            }
-            catch (ArgumentException ae)
-            {
+                // Handle the inner exception here
                 throw new JsonException (
-                                         $"Error Applying Configuration Change ({PropertyInfo?.Name}): {ae.Message}",
-                                         ae
+                                         $"Error Applying Configuration Change: {innerException.Message}",
+                                         innerException
                                         );
             }
+
+            // Handle the outer exception or rethrow it if needed
+            throw new JsonException ($"Error Applying Configuration Change: {tie.Message}", tie);
+        }
+        catch (ArgumentException ae)
+        {
+            throw new JsonException (
+                                     $"Error Applying Configuration Change ({PropertyInfo?.Name}): {ae.Message}",
+                                     ae
+                                    );
         }
 
         return PropertyValue != null;
@@ -94,6 +92,12 @@ public static string GetJsonPropertyName (PropertyInfo pi)
     /// <returns></returns>
     public object? RetrieveValue () { return PropertyValue = PropertyInfo!.GetValue (null); }
 
+    /// <summary>
+    ///     Updates (using reflection) <see cref="PropertyValue"/> with the value in <paramref name="source"/> using a deep memberwise copy.
+    /// </summary>
+    /// <param name="source"></param>
+    /// <returns></returns>
+    /// <exception cref="ArgumentException"></exception>
     internal object? UpdateValueFrom (object source)
     {
         if (source is null)