Allow providers to be added to run config args

Author: Jonathing

src/main/java/net/minecraftforge/gradle/SlimeLauncherOptionsInternal.java

@@ -4,9 +4,13 @@
  */
 package net.minecraftforge.gradle;
 
+import org.gradle.api.provider.Provider;
+import org.gradle.api.provider.ProviderConvertible;
 import org.gradle.api.reflect.HasPublicType;
 import org.gradle.api.reflect.TypeOf;
 
+import java.util.ArrayList;
+
 non-sealed interface SlimeLauncherOptionsInternal extends SlimeLauncherOptions, HasPublicType {
     @Override
     default TypeOf<?> getPublicType() {
@@ -18,7 +22,21 @@ default void apply(SlimeLauncherExec task) {
             task.getBootstrapMainClass().set(this.getMainClass());
 
         if (this.getArgs().filter(Util::isPresent).isPresent())
-            task.getMcBootstrapArgs().set(this.getArgs().map(it -> it.stream().map(Object::toString).toList()));
+            task.getMcBootstrapArgs().set(this.getArgs().map(args -> {
+                var list = new ArrayList<String>(args.size());
+                for (var arg : args) {
+                    if (arg instanceof ProviderConvertible<?>) {
+                        var s = ((ProviderConvertible<?>) arg).asProvider().get();
+                        list.add(s.toString());
+                    } else if (arg instanceof Provider<?>) {
+                        var s = ((Provider<?>) arg).get();
+                        list.add(s.toString());
+                    } else {
+                        list.add(arg.toString());
+                    }
+                }
+                return list;
+            }));
 
         if (this.getJvmArgs().filter(Util::isPresent).isPresent())
             task.jvmArgs(this.getJvmArgs().get());