Command system and input system

BLHX.Server.Game/Commands/Command.cs

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+using BLHX.Server.Common.Utils;
+using System.Reflection;
+
+namespace BLHX.Server.Game.Commands;
+
+[AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
+public class commandHandler : Attribute
+{
+    public string Name { get; }
+    public string Description { get; }
+    public string Example { get; }
+
+    public commandHandler(string commandName, string description, string example)
+    {
+        Name = commandName;
+        Description = description;
+        Example = example;
+    }
+}
+
+[AttributeUsage(AttributeTargets.Property)]
+public class ArgumentAttribute : Attribute
+{
+    public string Key { get; }
+
+    public ArgumentAttribute(string key)
+    {
+        Key = key;
+    }
+}
+
+public abstract class Command
+{
+    readonly Dictionary<string, PropertyInfo> argsProperties;
+
+    public Command()
+    {
+        argsProperties = GetType().GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
+            .Where(x => Attribute.IsDefined(x, typeof(ArgumentAttribute)))
+            .ToDictionary(x => ((ArgumentAttribute)Attribute.GetCustomAttribute(x, typeof(ArgumentAttribute))!).Key, StringComparer.OrdinalIgnoreCase);
+    }
+
+    public virtual void Execute(Dictionary<string, string> args)
+    {
+        foreach (var arg in args)
+        {
+            if (argsProperties.TryGetValue(arg.Key, out var prop))
+                prop.SetValue(this, arg.Value);
+        }
+    }
+}
+
+public static class CommandHandler
+{
+    public static readonly List<Command> Commands = new List<Command>();
+    
+    static readonly Dictionary<string, Action<Dictionary<string, string>>> commandFunctions;
+
+    static CommandHandler()
+    {
+        commandFunctions = new Dictionary<string, Action<Dictionary<string, string>>>(StringComparer.OrdinalIgnoreCase);
+
+        RegisterCommands(Assembly.GetExecutingAssembly());
+    }
+
+    public static void RegisterCommands(Assembly assembly)
+    {
+        var commandTypes = assembly.GetTypes()
+            .Where(t => Attribute.IsDefined(t, typeof(commandHandler)) && typeof(Command).IsAssignableFrom(t));
+
+        foreach (var commandType in commandTypes)
+        {
+            var commandAttribute = (commandHandler)Attribute.GetCustomAttribute(commandType, typeof(commandHandler));
+            if (commandAttribute != null)
+            {
+                var commandInstance = (Command)Activator.CreateInstance(commandType);
+                commandFunctions[commandAttribute.Name] = commandInstance.Execute;
+                Commands.Add(commandInstance);
+            }
+        }
+    }
+
+    public static void HandleCommand(string commandLine)
+    {
+        var parts = commandLine.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
+        if (parts.Length == 0)
+            return;
+
+        if (!commandFunctions.TryGetValue(parts[0], out var command))
+        {
+            Logger.c.Warn($"Unknown command: {parts[0]}");
+            return;
+        }
+
+        var arguments = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+        for (var i = 1; i < parts.Length; i++)
+        {
+            var argParts = parts[i].Split('=', 2);
+            if (argParts.Length == 2)
+                arguments[argParts[0]] = argParts[1];
+        }
+
+        command(arguments);
+    }
+}

BLHX.Server.Game/Commands/HelpCommand.cs

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+using System.Reflection;
+using System.Text;
+
+namespace BLHX.Server.Game.Commands;
+
+[commandHandler("help", "Print out all commands with their description and example", "help")]
+public class HelpCommand : Command
+{
+    static readonly Dictionary<Type, commandHandler?> commandAttributes = new Dictionary<Type, commandHandler?>();
+
+    public override void Execute(Dictionary<string, string> args)
+    {
+        base.Execute(args);
+
+        StringBuilder sb = new StringBuilder();
+
+        sb.AppendLine("Available Commands: ");
+        foreach (var command in CommandHandler.Commands)
+        {
+            if (!commandAttributes.TryGetValue(command.GetType(), out var attr))
+            {
+                attr = command.GetType().GetCustomAttribute(typeof(commandHandler)) as commandHandler;
+                commandAttributes[command.GetType()] = attr;
+            }
+
+            if (attr != null)
+                sb.AppendLine($"  {attr.Name} - {attr.Description} (Example: {attr.Example})");
+        }
+
+        Console.Write(sb.ToString());
+    }
+}

BLHX.Server.Game/Commands/SaveCommand.cs

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+using BLHX.Server.Common.Utils;
+
+namespace BLHX.Server.Game.Commands;
+
+[commandHandler("save", "Save the current state", "save")]
+public class SaveCommand : Command
+{
+    public override void Execute(Dictionary<string, string> args)
+    {
+        base.Execute(args);
+
+        Logger.c.Log("Saving...");
+        Logger.c.Log("Saved!");
+    }
+}

BLHX.Server.Game/InputSystem.cs

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+using BLHX.Server.Game.Commands;
+
+namespace BLHX.Server.Game;
+
+public static class InputSystem
+{
+    public static void Start()
+    {
+        while (true)
+        {
+            var command = Console.ReadLine();
+
+            if (string.IsNullOrEmpty(command)) continue;
+
+            CommandHandler.HandleCommand(command);
+        }
+    }
+}