merge all mixin configs and refmaps

build.gradle.kts

@@ -1,4 +1,6 @@
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
+import com.github.jengelman.gradle.plugins.shadow.transformers.Transformer
+import com.github.jengelman.gradle.plugins.shadow.transformers.TransformerContext
 import groovy.json.JsonOutput
 import groovy.json.JsonSlurper
 import kotlinx.serialization.encodeToString
@@ -12,6 +14,8 @@ import okhttp3.MultipartBody
 import okhttp3.Request
 import okhttp3.RequestBody.Companion.asRequestBody
 import okhttp3.internal.immutableListOf
+import org.apache.tools.zip.ZipEntry
+import org.apache.tools.zip.ZipOutputStream
 import org.objectweb.asm.ClassReader
 import org.objectweb.asm.ClassWriter
 import org.objectweb.asm.tree.ClassNode
@@ -313,7 +317,83 @@ tasks.jar {
 	enabled = false
 }
 
+class MixinConfigMergingTransformer : Transformer {
+	private val JSON = JsonSlurper()
+
+	@Input lateinit var modId: String
+	@Input lateinit var packageName: String
+	@Input lateinit var mixinPlugin: String
+
+	override fun getName(): String {
+		return "MixinConfigMergingTransformer"
+	}
+
+	override fun canTransformResource(element: FileTreeElement?): Boolean {
+		return element != null && (element.name.endsWith(".mixins.json") || element.name.endsWith("-refmap.json"))
+	}
+
+	private var transformed = false
+
+	private var mixins = ArrayList<String>()
+	private var refMaps = HashMap<String, Map<String, String>>()
+
+	override fun transform(context: TransformerContext?) {
+		if (context == null)
+			return
+
+		this.transformed = true
+
+		val parsed = JSON.parse(context.`is`) as Map<*, *>
+		if (parsed.contains("client")) {
+			@Suppress("UNCHECKED_CAST")
+			mixins.addAll(parsed["client"] as List<String>)
+		} else {
+			@Suppress("UNCHECKED_CAST")
+			refMaps.putAll(parsed["mappings"] as Map<String, Map<String, String>>)
+		}
+	}
+
+	override fun hasTransformedResource(): Boolean {
+		return transformed
+	}
+
+	override fun modifyOutputStream(os: ZipOutputStream?, preserveFileTimestamps: Boolean) {
+		val mixinConfigEntry = ZipEntry("${modId}.mixins.json")
+		os!!.putNextEntry(mixinConfigEntry)
+		os.write(JsonOutput.prettyPrint(JsonOutput.toJson(mapOf(
+			"required" to true,
+			"minVersion" to "0.8",
+			"package" to packageName,
+			"plugin" to mixinPlugin,
+			"compatibilityLevel" to "JAVA_8",
+			"mixins" to emptyList<String>(),
+			"client" to mixins,
+			"injectors" to mapOf(
+				"defaultRequire" to 1,
+			),
+			"refmap" to "${modId}-refmap.json",
+		))).toByteArray())
+
+		val refMapEntry = ZipEntry("${modId}-refmap.json")
+		os.putNextEntry(refMapEntry)
+		os.write(JsonOutput.prettyPrint(JsonOutput.toJson(mapOf(
+			"mappings" to refMaps,
+		))).toByteArray())
+
+		transformed = false
+		mixins.clear()
+		refMaps.clear()
+	}
+
+}
+
 tasks.shadowJar {
+	transform(MixinConfigMergingTransformer::class.java) {
+		modId = "mod_id"()
+		packageName = "dev.nolij.zume.mixin"
+		mixinPlugin = "dev.nolij.zume.impl.ZumeMixinPlugin"
+	}
+
 	val shadowJar = this
 	from("LICENSE") {
 		rename { "${it}_${"mod_id"()}" }
@@ -358,7 +438,7 @@ tasks.shadowJar {
 		attributes(
 			"FMLCorePluginContainsFMLMod" to true,
 			"ForceLoadAsMod" to true,
-			"MixinConfigs" to lexForgeImpls.joinToString(",") { "zume-${it}.mixins.json" },
+			"MixinConfigs" to "zume.mixins.json",
 			"TweakClass" to "org.spongepowered.asm.launch.MixinTweaker",
 		)
 	}

src/main/resources/fabric.mod.json

@@ -29,11 +29,7 @@
 			"dev.nolij.zume.primitive.event.KeyBindingRegistrar"
 		]
 	},
-	"mixins": [
-		"zume-modern.mixins.json",
-		"zume-legacy.mixins.json",
-		"zume-primitive.mixins.json"
-	],
+	"mixins": ["zume.mixins.json"],
 	"depends": {
 		"fabricloader": [">=${fabric_version}", "${babric_version}"]
 	}