feat: add remove, list, and add config commands

src/AltGen.Console/Common/HostBuilderExtensions.cs

@@ -9,12 +9,11 @@ static class HostBuilderExtensions
 
     app.Configure(static c =>
     {
-      c.PropagateExceptions();
-
       c.AddBranch("config", static c =>
       {
         c.AddCommand<AddConfigCommand>("add");
         c.AddCommand<RemoveConfigCommand>("remove");
+        c.AddCommand<ListConfigCommand>("list");
       });
     });
 

src/AltGen.Console/Config/AddConfigCommand.cs

@@ -24,7 +24,7 @@ sealed class AddConfigCommand(
     [Description("Set the provider as the default.")]
     public bool Default { get; init; }
 
-    public string SettingsPath => _fileSystem.Path.Combine(AppContext.BaseDirectory, "appsettings.json");
+    public string SettingsPath => _fileSystem.Path.Combine(AppContext.BaseDirectory, AppSettings.SettingsFileName);
   }
 
   public override async Task<int> ExecuteAsync(CommandContext context, Settings settings)

src/AltGen.Console/Config/AppSettings.cs

@@ -2,6 +2,8 @@ namespace AltGen.Console.Config;
 
 record AppSettings
 {
+  public const string SettingsFileName = "appsettings.json";
+
   public ProviderSettings[] Providers { get; init; } = [];
 
   public AppSettings(ProviderSettings[] providers)

src/AltGen.Console/Config/ListConfigCommand.cs

@@ -0,0 +1,34 @@
+
+namespace AltGen.Console.Config;
+
+sealed class ListConfigCommand(IAnsiConsole console, IFileSystem fileSystem) : AsyncCommand
+{
+  readonly IAnsiConsole _console = console;
+  readonly IFileSystem _fileSystem = fileSystem;
+
+  public override async Task<int> ExecuteAsync(CommandContext context)
+  {
+    var settingsPath = _fileSystem.Path.Combine(AppContext.BaseDirectory, AppSettings.SettingsFileName);
+    var settingsExist = _fileSystem.File.Exists(settingsPath);
+
+    if (settingsExist is false)
+    {
+      _console.MarkupLine("No settings found.");
+      return 0;
+    }
+
+    var settingsJson = await _fileSystem.File.ReadAllTextAsync(settingsPath);
+    var appSettings = JsonSerializer.Deserialize<AppSettings>(settingsJson, JsonOptions.Default)
+      ?? throw new ConfigException("Failed to deserialize settings.");
+
+    foreach (var provider in appSettings.Providers)
+    {
+      var providerName = provider.Provider;
+      var providerKey = provider.Key;
+      var isDefault = provider.Default ? " (default)" : string.Empty;
+      _console.MarkupLine($"[bold]{providerName}[/] [dim]{providerKey}[/]{isDefault}");
+    }
+
+    return 0;
+  }
+}

src/AltGen.Console/Config/RemoveConfigCommand.cs

@@ -16,7 +16,7 @@ sealed class RemoveConfigCommand(
     [Description("The provider to remove.")]
     public string Provider { get; init; } = string.Empty;
 
-    public string SettingsPath => _fileSystem.Path.Combine(AppContext.BaseDirectory, "appsettings.json");
+    public string SettingsPath => _fileSystem.Path.Combine(AppContext.BaseDirectory, AppSettings.SettingsFileName);
   }
 
   public override async Task<int> ExecuteAsync(CommandContext context, Settings settings)
@@ -29,7 +29,8 @@ sealed class RemoveConfigCommand(
     }
 
     var settingsJson = await _fileSystem.File.ReadAllTextAsync(settings.SettingsPath);
-    var appSettings = JsonSerializer.Deserialize<AppSettings>(settingsJson, JsonOptions.Default) ?? throw new ConfigException("Failed to deserialize app settings.");
+    var appSettings = JsonSerializer.Deserialize<AppSettings>(settingsJson, JsonOptions.Default)
+      ?? throw new ConfigException("Failed to deserialize app settings.");
     var updatedAppSettings = appSettings.RemoveProvider(settings);
     var updatedJson = JsonSerializer.Serialize(updatedAppSettings, JsonOptions.Default);
     await _fileSystem.File.WriteAllTextAsync(settings.SettingsPath, updatedJson);