Add NoEnableDisableAttribute to indicate that a plugin does not need an OnEnable and OnDisable method

IPA.Loader/Loader/PluginExecutor.cs

@@ -122,6 +122,7 @@ namespace IPA.Loader
         // TODO: make enable and disable able to take a bool indicating which it is
         private static Action<object> MakeLifecycleEnableFunc(Type type, string name)
         {
+            var noEnableDisable = type.GetCustomAttribute<NoEnableDisableAttribute>() is not null;
             var enableMethods = type.GetMethods(BindingFlags.Public | BindingFlags.Instance)
                                     .Select(m => (m, attrs: m.GetCustomAttributes(typeof(IEdgeLifecycleAttribute), false)))
                                     .Select(t => (t.m, attrs: t.attrs.Cast<IEdgeLifecycleAttribute>()))
@@ -129,7 +130,8 @@ namespace IPA.Loader
                                     .Select(t => t.m).ToArray();
             if (enableMethods.Length == 0)
             {
-                Logger.loader.Notice($"Plugin {name} has no methods marked [OnStart] or [OnEnable]. Is this intentional?");
+                if (!noEnableDisable)
+                    Logger.loader.Notice($"Plugin {name} has no methods marked [OnStart] or [OnEnable]. Is this intentional?");
                 return o => { };
             }
 
@@ -153,6 +155,7 @@ namespace IPA.Loader
         }
         private static Func<object, Task> MakeLifecycleDisableFunc(Type type, string name)
         {
+            var noEnableDisable = type.GetCustomAttribute<NoEnableDisableAttribute>() is not null;
             var disableMethods = type.GetMethods(BindingFlags.Public | BindingFlags.Instance)
                                     .Select(m => (m, attrs: m.GetCustomAttributes(typeof(IEdgeLifecycleAttribute), false)))
                                     .Select(t => (t.m, attrs: t.attrs.Cast<IEdgeLifecycleAttribute>()))
@@ -160,7 +163,8 @@ namespace IPA.Loader
                                     .Select(t => t.m).ToArray();
             if (disableMethods.Length == 0)
             {
-                Logger.loader.Notice($"Plugin {name} has no methods marked [OnExit] or [OnDisable]. Is this intentional?");
+                if (!noEnableDisable)
+                    Logger.loader.Notice($"Plugin {name} has no methods marked [OnExit] or [OnDisable]. Is this intentional?");
                 return o => TaskEx.WhenAll();
             }
 

IPA.Loader/PluginInterfaces/Attributes/LifecycleAttributes.cs

@@ -109,4 +109,20 @@ namespace IPA
     {
         EdgeLifecycleType IEdgeLifecycleAttribute.Type => EdgeLifecycleType.Disable;
     }
+
+    /// <summary>
+    /// Indicates that the applied plugin class does not need <see cref="OnEnableAttribute"/> or
+    /// <see cref="OnDisableAttribute"/> methods.
+    /// </summary>
+    /// <remarks>
+    /// This is typically only the ccase when some other utility mod handles their lifecycle for
+    /// them, such as with SiraUtil and Zenject.
+    /// </remarks>
+    /// <seealso cref="OnEnableAttribute"/>
+    /// <seealso cref="OnDisableAttribute"/>
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
+    public sealed class NoEnableDisableAttribute : Attribute
+    {
+
+    }
 }