Add: os.exit

src/Lua/Standard/OpenLibExtensions.cs

@@ -87,6 +87,7 @@ public static class OpenLibExtensions
 
     static readonly LuaFunction[] osFunctions = [
         ClockFunction.Instance,
+        ExitFunction.Instance,
         GetEnvFunction.Instance,
         SetLocaleFunction.Instance,
         TimeFunction.Instance,

src/Lua/Standard/OperatingSystem/ExitFunction.cs

@@ -0,0 +1,44 @@
+
+using Lua.Runtime;
+
+namespace Lua.Standard.OperatingSystem;
+
+public sealed class ExitFunction : LuaFunction
+{
+    public override string Name => "exit";
+    public static readonly ExitFunction Instance = new();
+
+    protected override ValueTask<int> InvokeAsyncCore(LuaFunctionExecutionContext context, Memory<LuaValue> buffer, CancellationToken cancellationToken)
+    {
+        // Ignore 'close' parameter
+
+        if (context.HasArgument(0))
+        {
+            var code = context.Arguments[0];
+
+            if (code.TryRead<bool>(out var b))
+            {
+                Environment.Exit(b ? 0 : 1);
+            }
+            else if (code.TryGetNumber(out var d))
+            {
+                if (!MathEx.IsInteger(d))
+                {
+                    throw new LuaRuntimeException(context.State.GetTraceback(), $"bad argument #1 to 'exit' (number has no integer representation)");
+                }
+
+                Environment.Exit((int)d);
+            }
+            else
+            {
+                LuaRuntimeException.BadArgument(context.State.GetTraceback(), 1, Name, LuaValueType.Nil.ToString(), code.Type.ToString());
+            }
+        }
+        else
+        {
+            Environment.Exit(0);
+        }
+
+        return new(0);
+    }
+}