some convenience methods for logging

src/main/java/com/cleanroommc/groovyscript/api/GroovyLog.java

@@ -14,7 +14,7 @@
 import java.util.function.Supplier;
 
 /**
- * A interface for the GroovyScript logger. The log is separate to Minecraft's normal and debug log.
+ * An interface for the GroovyScript logger. The log is separate to Minecraft's normal and debug log.
  * The generated log file can be found at "[Minecraft instance]/groovy.log".
  * All logging methods format its content similarly to how C does it.
  * Curly braces in the msg parameter get replaced with the given arguments.
@@ -269,6 +269,19 @@ interface Msg {
          */
         Msg add(boolean condition, String msg, Object... args);
 
+        /**
+         * Adds a sub message to this message with exactly one parameter, but only if the given condition is true. The arg {@link Supplier}
+         * is invoked if the condition is true.
+         *
+         * @param condition sub message will only be added if this is true
+         * @param msg       sub message
+         * @param arg       sub message argument
+         * @return this
+         */
+        default Msg add(boolean condition, String msg, Supplier<Object> arg) {
+            return add(condition, msg, (Object) arg);
+        }
+
         /**
          * Adds a sub message to this message, but only if the given condition is true.
          * For convenience.
@@ -290,8 +303,8 @@ interface Msg {
         Msg add(boolean condition, Consumer<Msg> msgBuilder);
 
         /**
-         * Adds an exception to the message. The exception will always be logged at last.
-         * The exception counts as a sub message. This message can only have one message at a time.
+         * Adds an exception to the message. The exception will always be logged at last. The exception counts as a sub message. This
+         * message can only have one message at a time.
          *
          * @param throwable exception.
          * @return this

src/main/java/com/cleanroommc/groovyscript/core/mixin/groovy/MetaClassImplMixin.java

@@ -22,9 +22,6 @@ public abstract class MetaClassImplMixin {
     @Shadow
     protected abstract Object doInvokeMethod(Class sender, Object object, String methodName, Object[] originalArguments, boolean isCallToSuper, boolean fromInsideClass);
 
-    @Shadow
-    protected MetaClassRegistry registry;
-
     @Shadow
     protected abstract Object invokeMissingMethod(Object instance, String methodName, Object[] arguments, RuntimeException original, boolean isCallToSuper);
 
@@ -47,6 +44,8 @@ public abstract class MetaClassImplMixin {
     @Final
     private MetaMethod[] additionalMetaMethods;
 
+    @Shadow protected MetaClassRegistry registry;
+
     @Inject(method = "<init>(Ljava/lang/Class;[Lgroovy/lang/MetaMethod;)V", at = @At("TAIL"))
     public void removeBlacklistedAdditional(Class<?> theClass, MetaMethod[] add, CallbackInfo ci) {
         if (additionalMetaMethods.length > 0) {

src/main/java/com/cleanroommc/groovyscript/sandbox/GroovyLogImpl.java

@@ -138,7 +138,7 @@ public Path getPath() {
     }
 
     /**
-     * Logs a info msg to the groovy log AND Minecraft's log
+     * Logs an info msg to the groovy log AND Minecraft's log
      *
      * @param msg  message
      * @param args arguments
@@ -347,6 +347,13 @@ public Msg add(String msg, Object... data) {
         @Override
         public Msg add(boolean condition, String msg, Object... args) {
             if (condition) {
+                if (args != null && args.length > 0) {
+                    for (int i = 0; i < args.length; i++) {
+                        if (args[i] instanceof Supplier<?> s) {
+                            args[i] = s.get();
+                        }
+                    }
+                }
                 return add(msg, args);
             }
             return this;