Added CommandLine parsing to the launcher

src/VoltstroEngineLauncher/CommandLine.cs

@@ -0,0 +1,39 @@
+using System.CommandLine;
+using System.CommandLine.Invocation;
+
+namespace VoltstroEngineLauncher
+{
+	/// <summary>
+	/// Handles setting up command line parameters
+	/// </summary>
+	internal static class CommandLine
+	{
+		/// <summary>
+		/// The game name to launch
+		/// </summary>
+		public static string GameName;
+
+		/// <summary>
+		/// Parses arguments and sets the supported argument types in their appropriate variable
+		/// </summary>
+		/// <param name="args"></param>
+		public static void ParseArguments(string[] args)
+		{
+			RootCommand rootCommand = new RootCommand
+			{
+				new Option<string>(
+					"-game",
+					getDefaultValue: () => "Sandbox",
+					description: "The game to launch")
+			};
+
+			rootCommand.Description = "Voltstro Engine Launcher";
+			rootCommand.Handler = CommandHandler.Create<string>((game) =>
+			{
+				GameName = game;
+			});
+
+			rootCommand.InvokeAsync(args);
+		}
+	}
+}

src/VoltstroEngineLauncher/Program.cs

@@ -10,25 +10,33 @@
 
 namespace VoltstroEngineLauncher
 {
+	/// <summary>
+	/// Program for VoltstroEngineLauncher
+	/// </summary>
 	public class Program
 	{
-		private const string DefaultGame = "Sandbox";
-
+		/// <summary>
+		/// The launcher for the VoltstroEngine
+		/// </summary>
 		[STAThread]
 		public static void Main(string[] args)
 		{
+			//Do our command line parsing first
+			CommandLine.ParseArguments(args);
+
 			//Create our Eto.Forms app, so we can show message boxes
 			//We shut this down before we run the engine
 			Platform.AllowReinitialize = true;
 			Application app = new Application();
 
+			//Now to get the game's entry point
 			IEntryPoint entryPoint = null;
-			string dllPath = Path.GetFullPath($"{DefaultGame}/bin/{DefaultGame}.dll");
+			string dllPath = Path.GetFullPath($"{CommandLine.GameName}/bin/{CommandLine.GameName}.dll");
 			try
 			{
 				//Load the game assembly
 				AssemblyLoad assemblyLoad = new AssemblyLoad();
-				Assembly gameDll = assemblyLoad.LoadAssembly(Path.GetFullPath($"{DefaultGame}/bin"), $"{DefaultGame}.dll");
+				Assembly gameDll = assemblyLoad.LoadAssembly(Path.GetFullPath($"{CommandLine.GameName}/bin"), $"{CommandLine.GameName}.dll");
 
 				//Find a class the inherits from IEntryPoint so that we can create the game
 				foreach (Type type in gameDll.GetTypes().Where(x => x.IsPublic && x.IsClass)) //Needs to be public
@@ -42,9 +50,9 @@ public static void Main(string[] args)
 			}
 			catch (FileNotFoundException ex) //The DLL wasn't found
 			{
-				Debug.Assert(false, $"The game DLL for '{DefaultGame}' wasn't found in '{dllPath}'!\n{ex}");
+				Debug.Assert(false, $"The game DLL for '{CommandLine.GameName}' wasn't found in '{dllPath}'!\n{ex}");
 #if !DEBUG
-				Eto.Forms.MessageBox.Show($"The game DLL for '{DefaultGame}' wasn't found in '{dllPath}'!", "Engine Error",
+				Eto.Forms.MessageBox.Show($"The game DLL for '{CommandLine.GameName}' wasn't found in '{dllPath}'!", "Engine Error",
 					Eto.Forms.MessageBoxButtons.OK, Eto.Forms.MessageBoxType.Error);
 				app.Dispose();
 				Environment.Exit(0);

src/VoltstroEngineLauncher/VoltstroEngineLauncher.csproj

@@ -23,6 +23,10 @@
     <OutputPath>../../game/bin/Release</OutputPath>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="System.CommandLine" Version="2.0.0-beta1.20303.1" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\VoltstroEngine\VoltstroEngine.csproj" />
   </ItemGroup>