Provide a dummy RP for mods that base their own pack's ordering off it

See: ARRP

gradle.properties

@@ -68,5 +68,5 @@ fabric-client-tags-api-v1-version=1.1.1
 loom.platform=forge
 forge_version=1.20.1-47.2.6
 pack_format=15
-forgified_version=1.10.7
+forgified_version=1.10.8
 forge_fabric_loader_version=2.6.0+0.15.0+1.20.1

gradle/ffapi-setup.gradle

@@ -31,6 +31,7 @@ import java.nio.file.StandardCopyOption
 
 allprojects {
 	if (name == 'deprecated') return
+	final selfProject = it
 
 	sourceSets.configureEach { sourceSet ->
 		// We have to capture the source set name for the lazy string literals,
@@ -53,6 +54,7 @@ allprojects {
 			packFormat = rootProject.pack_format.toInteger()
 			addMixinConfigs = sourceSet.name.startsWith("test")
 			accessWidener = loom.accessWidenerPath
+			containsCode = selfProject === rootProject
 		}
 		sourceSet.resources.srcDir task
 
@@ -336,6 +338,9 @@ abstract class GenerateForgeModMetadata extends DefaultTask {
 	@Input
 	final Property<String> forgeVersionString = project.objects.property(String)
 
+	@Input
+	final Property<Boolean> containsCode = project.objects.property(Boolean)
+
 	@Input
 	final Property<String> minecraftVersionString = project.objects.property(String)
 
@@ -387,7 +392,7 @@ abstract class GenerateForgeModMetadata extends DefaultTask {
 	def run() {
 		def output = outputDir.get().asFile.toPath()
 		output.deleteDir()
-		def containsCode = sourceRoots.any { new File(it.parentFile, "java").exists() }
+		def containsCode = sourceRoots.any { new File(it.parentFile, "java").exists() } || this.containsCode.get()
 		for (def sourceRoot in sourceRoots) {
 			if (!sourceRoot.isDirectory()) {
 				continue

src/main/java/net/fabricmc/fabric/impl/sinytra/SinytraFabric.java

@@ -0,0 +1,38 @@
+package net.fabricmc.fabric.impl.sinytra;
+
+import net.minecraft.resource.DirectoryResourcePack;
+import net.minecraft.resource.ResourcePackProfile;
+
+import net.minecraft.resource.ResourcePackSource;
+import net.minecraft.text.Text;
+
+import net.minecraftforge.event.AddPackFindersEvent;
+import net.minecraftforge.eventbus.api.EventPriority;
+import net.minecraftforge.fml.ModList;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
+
+@Mod("fabric_api")
+public class SinytraFabric {
+	public SinytraFabric() {
+		FMLJavaModLoadingContext.get().getModEventBus().addListener(EventPriority.NORMAL, false, AddPackFindersEvent.class, this::addPackFinder);
+	}
+
+	/**
+	 * Some mods (ARRP) may use a resource pack named {@code fabric} to sort their own packs around. So just provide it.
+	 */
+	private void addPackFinder(AddPackFindersEvent event) {
+		event.addRepositorySource(profileAdder -> profileAdder.accept(
+				ResourcePackProfile.create(
+						"fabric",
+						Text.of("fabric"),
+						true,
+						name -> new DirectoryResourcePack(name, ModList.get().getModContainerById("fabric_api").get().getModInfo().getOwningFile()
+								.getFile().findResource("dummyrp"), true),
+						event.getPackType(),
+						ResourcePackProfile.InsertionPosition.TOP,
+						ResourcePackSource.BUILTIN
+				)
+		));
+	}
+}

src/main/resources/dummyrp/pack.mcmeta

@@ -0,0 +1,8 @@
+{
+  "pack": {
+    "description": {
+      "text": "fabric_api dummy resources"
+    },
+    "pack_format": 15
+  }
+}