Created the Avalonia MVVM template, split the CLI into Avalonia.UI and Avalonia.Core

AutumnLauncher.CLI/AutumnLauncher.CLI.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net7.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="CommandLineParser" Version="2.9.1" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\AutumnLauncher.Core\AutumnLauncher.Core.csproj" />
+    </ItemGroup>
+
+</Project>

AutumnLauncher.CLI/Options.cs

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+using CommandLine;
+
+namespace AutumnLauncher.CLI;
+
+// Command-line options for the --run argument
+[Verb("run", HelpText = "Run a game.")]
+public class RunOptions
+{
+    [Option('i', "id", Required = true, HelpText = "Game ID.")]
+    public int Id { get; set; }
+}
+
+// Command-line options for the --remove argument
+[Verb("remove", HelpText = "Remove a game.")]
+public class RemoveOptions
+{
+    [Option('i', "id", Required = true, HelpText = "Game ID.")]
+    public int Id { get; set; }
+}
+
+// Command-line options for the --list argument
+[Verb("list", HelpText = "List all games.")]
+public class ListOptions
+{
+}
+
+// Command-line options for the --add argument
+[Verb("add", HelpText = "Add a game.")]
+public class AddOptions
+{
+    [Option('n', "name", Required = true, HelpText = "Game name.")]
+    public string? Name { get; set; }
+
+    [Option('d', "developer", Required = true, HelpText = "Game developer.")]
+    public string? Developer { get; set; }
+
+    [Option('r', "date", Required = true, HelpText = "Release date.")]
+    public string? Date { get; set; }
+
+    [Option('g', "genre", Required = true, HelpText = "Game genre.")]
+    public string? Genre { get; set; }
+
+    [Option('t', "type", Required = true, HelpText = "Game type.")]
+    public string? Type { get; set; }
+
+    [Option('p', "path", Required = true, HelpText = "Game path.")]
+    public string? Path { get; set; }
+}
+
+[Verb("edit", HelpText = "Add a game.")]
+public class EditOptions
+{
+    [Option('i', "id", Required = true, HelpText = "Game id.")]
+    public int Id { get; set; }
+    
+    [Option('n', "name", Required = false, HelpText = "Game name.")]
+    public string? Name { get; set; }
+
+    [Option('d', "developer", Required = false, HelpText = "Game developer.")]
+    public string? Developer { get; set; }
+
+    [Option('r', "date", Required = false, HelpText = "Release date.")]
+    public string? Date { get; set; }
+
+    [Option('g', "genre", Required = false, HelpText = "Game genre.")]
+    public string? Genre { get; set; }
+
+    [Option('t', "type", Required = false, HelpText = "Game type.")]
+    public string? Type { get; set; }
+
+    [Option('p', "path", Required = false, HelpText = "Game path.")]
+    public string? Path { get; set; }
+}

AutumnLauncher.CLI/Program.cs

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+using CommandLine;
+
+namespace AutumnLauncher.CLI;
+
+public static class Program
+{
+    public static void Main(string[] args)
+    {
+        // create directory and database if not already created
+        Directory.CreateDirectory(Configuration.DataDir);
+        Directory.CreateDirectory(Configuration.ConfigDir);
+        SqliteData.CreateDatabase();
+
+        Parser.Default.ParseArguments<AddOptions, ListOptions, RunOptions, RemoveOptions, EditOptions>(args)
+            .WithParsed<AddOptions>(RunAdd)
+            .WithParsed<ListOptions>(RunList)
+            .WithParsed<RemoveOptions>(RunRemove)
+            .WithParsed<RunOptions>(RunRun)
+            .WithParsed<EditOptions>(RunEdit);
+        //.WithNotParsed(HandleParseError);
+    }
+
+    private static void RunAdd(AddOptions options)
+    {
+        ControlActions.Add(options.Name, options.Developer, options.Date, options.Genre, options.Type, options.Path);
+    }
+
+    private static void RunList(ListOptions options)
+    {
+        ControlActions.List();
+    }
+
+    private static void RunRemove(RemoveOptions options)
+    {
+        ControlActions.Remove(options.Id);
+    }
+
+    private static void RunRun(RunOptions options)
+    {
+        ControlActions.Run(options.Id);
+    }
+    
+    private static void RunEdit(EditOptions options)
+    {
+        ControlActions.Edit(options.Id, options.Name, options.Developer, options.Date, options.Genre, options.Type, options.Path);
+    }
+
+    // private static void HandleParseError(IEnumerable<Error> errors)
+    // {
+    //     // Handle command-line argument parsing errors
+    //     foreach (var error in errors) Console.WriteLine(error.ToString());
+    // }
+}