Merge pull request 'Datagen insanity, dependency, mixin & AW remapping' (#4) from owlsys/insanity into mistress

Reviewed-on: #4

build.gradle.kts

@@ -7,7 +7,7 @@ plugins {
 }
 
 group = "dev.frogmc"
-version = "0.0.1-alpha.15"
+version = "0.0.1-alpha.16"
 
 repositories {
     maven {
@@ -24,7 +24,7 @@ repositories {
 }
 
 dependencies {
-    implementation("dev.frogmc:thyroxine:0.0.1-alpha.6")
+    implementation("dev.frogmc:thyroxine:0.0.1-alpha.10")
     implementation("org.ow2.asm:asm:9.7")
     implementation("org.ow2.asm:asm-commons:9.7")
     implementation("org.ow2.asm:asm-tree:9.7")

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 #Sun May 12 17:35:40 BST 2024
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

src/main/kotlin/dev/frogmc/phytotelma/Constants.kt

@@ -1,6 +1,9 @@
 package dev.frogmc.phytotelma
 
+import org.objectweb.asm.Opcodes
+
 object Constants {
+    const val MOJMAP_NAMESPACE = "mojmap"
     const val MOD_EXTENSION = ".frogmod"
     const val MOD_METADATA_FILE = "frog.mod.toml"
     const val MINECRAFT_CONFIGURATION = "minecraftDependency"
@@ -14,4 +17,7 @@ object Constants {
     const val RUNT_SERVER_TASK = "runServer"
     const val CLEAR_LOCAL_CACHE_TASK = "clearLocalCache"
     const val CLEAR_GLOBAL_CACHE_TASK = "clearGlobalCache"
+    const val ASM_VERSION = Opcodes.ASM9
+    const val ALTERNATIVE_RUNTIME_JAR_NAME = "runtime.jar"
+    const val MOJANG_MANIFEST_URL = "https://piston-meta.mojang.com/mc/game/version_manifest_v2.json"
 }

src/main/kotlin/dev/frogmc/phytotelma/PhytotelmaPlugin.kt

@@ -1,32 +1,41 @@
 package dev.frogmc.phytotelma
 
+import com.electronwill.nightconfig.core.CommentedConfig
 import com.electronwill.nightconfig.core.file.FileNotFoundAction
+import com.electronwill.nightconfig.core.io.WritingMode
 import com.electronwill.nightconfig.toml.TomlParser
+import com.electronwill.nightconfig.toml.TomlWriter
 import dev.frogmc.phytotelma.accesswidener.AccessWidener
 import dev.frogmc.phytotelma.build.PhytotelmaBuildTask
 import dev.frogmc.phytotelma.common.Env
 import dev.frogmc.phytotelma.ext.PhytotelmaGradleExtension
 import dev.frogmc.phytotelma.ext.PhytotelmaGradleExtensionImpl
 import dev.frogmc.phytotelma.mappings.renameDstNamespace
+import dev.frogmc.phytotelma.mixin.remapper.MixinAnnotationRemapper
+import dev.frogmc.phytotelma.nest.NestStripper
+import dev.frogmc.phytotelma.nest.Nester
 import dev.frogmc.phytotelma.run.AssetDownloader
 import dev.frogmc.phytotelma.run.RunConfigGenerator
 import dev.frogmc.phytotelma.run.task.RunGameTask
 import dev.frogmc.phytotelma.vineflower.FrogJavadocProvider
+import dev.frogmc.thyroxine.RemappingStep
 import dev.frogmc.thyroxine.Thyroxine
 import dev.frogmc.thyroxine.api.Mapper
 import dev.frogmc.thyroxine.api.data.MappingBundle
+import dev.frogmc.thyroxine.api.data.MappingData
 import dev.frogmc.thyroxine.provider.MojmapProvider
+import dev.frogmc.thyroxine.writer.tiny.TinyV2Writer
 import net.fabricmc.fernflower.api.IFabricJavadocProvider
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.plugins.JavaBasePlugin
 import org.gradle.api.plugins.JavaPlugin
 import org.gradle.api.tasks.Delete
-import org.gradle.configurationcache.extensions.capitalized
 import org.jetbrains.java.decompiler.main.Fernflower
 import org.jetbrains.java.decompiler.main.decompiler.PrintStreamLogger
 import org.jetbrains.java.decompiler.main.decompiler.SingleFileSaver
 import org.jetbrains.java.decompiler.main.extern.IFernflowerPreferences
+import org.objectweb.asm.commons.ClassRemapper
 import java.io.OutputStream
 import java.io.PrintStream
 import java.net.URI
@@ -34,6 +43,7 @@ import java.nio.file.FileSystems
 import java.nio.file.Files
 import java.nio.file.Path
 import java.nio.file.StandardCopyOption
+import java.util.*
 import kotlin.io.path.*
 
 
@@ -84,7 +94,7 @@ class PhytotelmaPlugin : Plugin<Project> {
         )
 
         ModConfigurations.configurations.forEach { conf ->
-            project.configurations.create("mod" + conf.name.capitalized()) { c ->
+            project.configurations.create("mod" + conf.name.replaceFirstChar { if (it.isLowerCase()) it.titlecase(Locale.ROOT) else it.toString() }) { c ->
                 c.isCanBeResolved = true
                 c.isCanBeConsumed = false
 
@@ -116,6 +126,12 @@ class PhytotelmaPlugin : Plugin<Project> {
         }
 
         setupTasks(project)
+
+        project.afterEvaluate {
+            project.afterEvaluate {
+                ProjectStorage.write(project)
+            }
+        }
     }
 
     private fun setupTasks(project: Project) {
@@ -186,60 +202,51 @@ class PhytotelmaPlugin : Plugin<Project> {
 
         project.tasks.getByName(JavaPlugin.JAR_TASK_NAME).actions.addLast { task ->
             val storage = ProjectStorage.get(project)
-            if (storage.targetNamespace != "mojmap") {
-                val mappings = MappingBundle.merge(
-                    storage.mappings!!.reverse(), MojmapProvider.get(
+            if (storage.targetNamespace != Constants.MOJMAP_NAMESPACE) {
+                val moj = if (storage.intermediaryNs == Constants.MOJMAP_NAMESPACE) {
+                    MojmapProvider.get(
                         storage.minecraftVersion!!,
                         globalCacheDir.resolve("net/minecraft/client/${storage.minecraftVersion}/client-${storage.minecraftVersion}.txt")
-                    ).orElseThrow().reverse().renameDstNamespace("mojmap")
-                ).forNamespaces(storage.targetNamespace, "mojmap")
-                val parser = TomlParser()
+                    ).orElseThrow().reverse().renameDstNamespace(Constants.MOJMAP_NAMESPACE)
+                } else null
+                val mappings = (moj?.let {
+                    MappingBundle.merge(
+                        storage.mappings!!.reverse(), it
+                    )
+                } ?: storage.mappings!!).forNamespaces(storage.targetNamespace, storage.intermediaryNs)
+                val includeConfiguration = project.configurations.findByName(Constants.INCLUDE_CONFIGURATION)
                 task.outputs.files.forEach { file ->
                     val temp = Files.createTempFile("", file.name)
                     Files.copy(file.toPath(), temp, StandardCopyOption.REPLACE_EXISTING)
                     FileSystems.newFileSystem(temp).use { fs ->
+                        if (includeConfiguration != null) {
+                            val jijPath = fs.getPath("META-INF/jars")
+                            val files = Nester.run(includeConfiguration, jijPath).map { it.toml() }.toList()
+                            if (files.isNotEmpty()) {
+                                val manifest = fs.getPath(Constants.MOD_METADATA_FILE)
+                                val config: CommentedConfig =
+                                    tomlParser.parse(manifest, FileNotFoundAction.THROW_ERROR)
+                                if (!config.add("frog.extensions.included_jars", files)) {
+                                    println("Failed to add included jars to mod manifest, make sure it doesn't include a key at 'frog.extensions.included_jars'!")
+                                }
+                                tomlWriter.write(config, manifest, WritingMode.REPLACE)
+                            }
+                        }
                         val metadata = fs.getPath(Constants.MOD_METADATA_FILE)
-                        parser.parse(metadata, FileNotFoundAction.READ_NOTHING)
+                        tomlParser.parse(metadata, FileNotFoundAction.READ_NOTHING)
                             .get<String>("frog.extensions.accesswidener")?.let { name ->
                                 val aw = metadata.resolveSibling(name)
                                 AccessWidener.checkAW(aw, ProjectStorage.get(project).remappedGameJarPath!!)
-                                val mapper = Mapper(mappings) { listOf() }
-                                val buffer = buildString {
-                                    aw.forEachLine {
-                                        if (it.contains("\\t") && !it.startsWith("#")) {
-                                            val parts = it.split("[\\t #]+".toRegex()).toMutableList()
-
-                                            if (parts.size > 2) {
-
-                                                val type = parts[1]
-                                                when (type) {
-                                                    "class" -> {
-                                                        parts[2] = mapper.map(parts[2])
-                                                    }
-
-                                                    "fields" -> {
-                                                        parts[3] = mapper.mapFieldName(parts[2], parts[3], parts[4])
-                                                        parts[4] = mapper.mapDesc(parts[4])
-                                                        parts[3] = mapper.map(parts[2])
-                                                    }
-
-                                                    "methods" -> {
-                                                        parts[3] = mapper.mapMethodName(parts[2], parts[3], parts[4])
-                                                        parts[4] = mapper.mapMethodDesc(parts[4])
-                                                        parts[2] = mapper.map(parts[2])
-                                                    }
-                                                }
-                                                appendLine(parts.joinToString("\\t"))
-                                                return@forEachLine
-                                            }
-                                        }
-                                        appendLine(it)
-                                    }
-                                }
-                                aw.writeText(buffer)
+                                remapAccesswidener(mappings, aw)
                             }
                     }
-                    Thyroxine.remap(mappings, temp, file.toPath(), false, false)
+                    Thyroxine.remap(
+                        mappings,
+                        temp,
+                        file.toPath(),
+                        false,
+                        defaultRemappingSteps(ProjectStorage.get(project).remappedGameJarPath!!)
+                    )
                     Files.deleteIfExists(temp)
                 }
             }
@@ -267,29 +274,57 @@ class PhytotelmaPlugin : Plugin<Project> {
         }
     }
 
+    private fun defaultRemappingSteps(sourceNsJar: Path): MutableList<RemappingStep> {
+        return mutableListOf(
+            RemappingStep(::ClassRemapper),
+            RemappingStep { cv, mapper -> MixinAnnotationRemapper(cv, mapper, sourceNsJar) },
+        )
+    }
+
     private fun remapModDependencies(project: Project) {
         val out = System.out
         // Mute the output from thyroxine as there may be a lot of remapping operations here
         System.setOut(PrintStream(OutputStream.nullOutputStream()))
+        val mojmapGameJar = ProjectStorage.get(project).remappedGameJarPath!!.resolveSibling("mojmap.jar")
+        val version = ProjectStorage.get(project).minecraftVersion!!
+        val officialJar = VersionChecker.downloadClient(project, version)
         ModConfigurations.configurations.forEach { conf ->
-            val artifacts = project.configurations.getByName("mod" + conf.name.capitalized())
+            val artifacts = project.configurations.getByName("mod" + conf.name.replaceFirstChar {
+                if (it.isLowerCase()) it.titlecase(
+                    Locale.getDefault()
+                ) else it.toString()
+            })
                 .resolvedConfiguration.resolvedArtifacts
             if (artifacts.isEmpty()) {
                 return
             }
-            val target = project.configurations.create("mod" + conf.name.capitalized() + "Mapped") { c ->
+            if (mojmapGameJar.notExists()) {
+                Thyroxine.run(version, officialJar, mojmapGameJar, true, false)
+            }
+            val target = project.configurations.create("mod" + conf.name.replaceFirstChar {
+                if (it.isLowerCase()) it.titlecase(
+                    Locale.getDefault()
+                ) else it.toString()
+            } + "Mapped") { c ->
                 c.isTransitive = false
                 conf.classpathNames.forEach {
                     project.configurations.getByName(it).extendsFrom(c)
                 }
             }
             val storage = ProjectStorage.get(project)
-            val mappings = MappingBundle.merge(
-                storage.mappings!!.reverse(), MojmapProvider.get(
-                    storage.minecraftVersion!!,
-                    globalCacheDir.resolve("net/minecraft/client/${storage.minecraftVersion}/client-${storage.minecraftVersion}.txt")
-                ).orElseThrow().reverse().renameDstNamespace("mojmap")
-            ).forNamespaces("mojmap", storage.targetNamespace)
+            TinyV2Writer.write(
+                storage.mappings!!,
+                project.projectDir.resolve("storageMappings.tiny").writer()
+            )
+            val officialStore = storage.mappings!!.forNamespaces(storage.targetNamespace!!, "official").reverse()
+            TinyV2Writer.write(
+                MappingBundle(officialStore),
+                project.projectDir.resolve("officialStore.tiny").toPath().writer()
+            )
+            val mojOfficial = MojmapProvider.get(
+                storage.minecraftVersion!!,
+                globalCacheDir.resolve("net/minecraft/client/${storage.minecraftVersion}/client-${storage.minecraftVersion}.txt")
+            ).orElseThrow().reverse().renameDstNamespace(Constants.MOJMAP_NAMESPACE).data[0].reverse()
             val targetPath = project.layout.buildDirectory.asFile.get().toPath().resolve("remappedMods")
                 .resolve("dev/frogmc/phytotelma/remapped_mods")
             val remappedPaths = mutableListOf<Path>()
@@ -297,10 +332,10 @@ class PhytotelmaPlugin : Plugin<Project> {
                 val group = artifact.moduleVersion.id.group
                 val name = artifact.moduleVersion.id.name
                 val groupname = (group + "_" + name).replace(".", "_")
-                val version = artifact.moduleVersion.id.version
+                val artifactVersion = artifact.moduleVersion.id.version
                 val classifier = artifact.classifier
-                val remappedPath = targetPath.resolve(groupname).resolve(version)
-                    .resolve(groupname + "-" + version + (classifier?.let { "-$it" } ?: "") + ".jar")
+                val remappedPath = targetPath.resolve(groupname).resolve(artifactVersion)
+                    .resolve(groupname + "-" + artifactVersion + (classifier?.let { "-$it" } ?: "") + ".jar")
                 remappedPath.createParentDirectories()
                 remappedPaths.add(remappedPath)
 
@@ -312,23 +347,97 @@ class PhytotelmaPlugin : Plugin<Project> {
                             "\t<modelVersion>4.0.0</modelVersion>\n" +
                             "\t<groupId>dev.frogmc.phytotelma.remapped_mods</groupId>\n" +
                             "\t<artifactId>$groupname</artifactId>\n" +
-                            "\t<version>$version</version>\n" +
+                            "\t<version>$artifactVersion</version>\n" +
                             "</project>"
                 )
                 remappedPaths.add(pom)
 
-                Thyroxine.remap(mappings, artifact.file.toPath(), remappedPath, false, false)
+                val temp = remappedPath.resolveSibling(remappedPath.fileName.toString() + ".tmp")
+                Thyroxine.remap(
+                    mojOfficial, artifact.file.toPath(), temp, false, defaultRemappingSteps(
+                        mojmapGameJar
+                    ), mojmapGameJar
+                )
+                Thyroxine.remap(
+                    officialStore, temp, remappedPath, false, defaultRemappingSteps(
+                        officialJar
+                    ), officialJar
+                )
+                Files.deleteIfExists(temp)
+                NestStripper.stripJij(remappedPath)
+
+                FileSystems.newFileSystem(remappedPath).use { fs ->
+                    val metadata = fs.getPath(Constants.MOD_METADATA_FILE)
+                    tomlParser.parse(metadata, FileNotFoundAction.READ_NOTHING)
+                        .get<String>("frog.extensions.accesswidener")?.let { name ->
+                            val aw = metadata.resolveSibling(name)
+                            remapAccesswidener(mojOfficial, aw)
+                            remapAccesswidener(officialStore, aw)
+
+                            AccessWidener.checkAW(aw, ProjectStorage.get(project).remappedGameJarPath!!)
+                        }
+                }
 
                 project.dependencies.add(
                     target.name,
-                    "dev.frogmc.phytotelma.remapped_mods:$groupname:$version" + (classifier?.let { ":$it" } ?: "")
+                    "dev.frogmc.phytotelma.remapped_mods:$groupname:$artifactVersion" + (classifier?.let { ":$it" }
+                        ?: "")
                 )
             }
+            Files.deleteIfExists(mojmapGameJar)
         }
         System.setOut(out)
     }
 
+    private fun remapAccesswidener(mappings: MappingData, aw: Path) {
+        val mapper = Mapper(mappings) { listOf() }
+        val buffer = buildString {
+            aw.forEachLine {
+                if ((it.contains("\t") || it.contains(" ")) && !it.startsWith("#")) {
+                    val parts = it.split("[\\t #]+".toRegex()).toMutableList()
+
+                    if (parts.size > 2) {
+
+                        val type = parts[1]
+                        when (type) {
+                            "class" -> {
+                                parts[2] = mapper.map(parts[2])
+                            }
+
+                            "field" -> {
+                                parts[3] = mapper.mapFieldName(parts[2], parts[3], parts[4])
+                                parts[4] = mapper.mapDesc(parts[4])
+                                parts[2] = mapper.map(parts[2])
+                            }
+
+                            "method" -> {
+                                parts[3] = mapper.mapMethodName(parts[2], parts[3], parts[4])
+                                parts[4] = mapper.mapMethodDesc(parts[4])
+                                parts[2] = mapper.map(parts[2])
+                            }
+                        }
+                        appendLine(parts.joinToString(" "))
+                        return@forEachLine
+                    }
+                }
+                appendLine(it)
+            }
+        }
+        aw.writeText(buffer)
+    }
+
     companion object {
         lateinit var globalCacheDir: Path
+        val tomlParser = TomlParser()
+        val tomlWriter = TomlWriter()
     }
 }
+
+fun Project.getId(): String {
+    var path = name
+    var parent: Project? = this
+    while ((parent?.parent.also { parent = it }) != null) {
+        path = parent!!.name + "." + path
+    }
+    return path
+}

src/main/kotlin/dev/frogmc/phytotelma/ProjectStorage.kt

@@ -1,20 +1,64 @@
 package dev.frogmc.phytotelma
 
+import com.google.gson.FieldNamingPolicy
+import com.google.gson.GsonBuilder
+import com.google.gson.TypeAdapter
+import com.google.gson.stream.JsonReader
+import com.google.gson.stream.JsonToken
+import com.google.gson.stream.JsonWriter
 import dev.frogmc.thyroxine.api.data.MappingBundle
 import org.gradle.api.Project
 import java.nio.file.Path
+import java.util.*
+import kotlin.io.path.absolutePathString
+import kotlin.io.path.exists
+import kotlin.io.path.reader
+import kotlin.io.path.writeText
 
 object ProjectStorage {
 
-    private val data = mutableMapOf<Project, ProjectData>()
+    private val data = WeakHashMap<String, ProjectData>()
+    private val gson = GsonBuilder()
+        .setPrettyPrinting()
+        .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
+        .registerTypeAdapter(ProjectData::class.java, ProjectDataTypeAdapter())
+        .create()
 
     fun get(project: Project): ProjectData {
-        if (!data.containsKey(project)) {
-            data[project] = ProjectData(null, null, null, null, null, null)
+        val id = project.getId()
+        if (!data.containsKey(id)) {
+            val cacheFile = getCacheFile(project)
+            val projectData = cacheFile.takeIf { it.exists() }?.let { read(it) }
+            if (projectData != null) {
+                data[id] = projectData
+            } else {
+                println("Creating project data store for $id, size: ${data.size}, ${this.hashCode()}")
+                data[id] = ProjectData()
+            }
         }
-        return data[project]!!
+        return data[id]!!
     }
 
+    private fun getCacheFile(project: Project): Path {
+        return project.projectDir.resolve(".gradle/phytotelma/${project.getId()}_data").toPath()
+    }
+
+    fun write(project: Project) {
+        write(getCacheFile(project), data[project.getId()]!!)
+    }
+
+    private fun write(path: Path, projectData: ProjectData) {
+        path.writeText(gson.toJson(projectData))
+    }
+
+    private fun read(path: Path): ProjectData? {
+        val reader = path.takeIf { it.exists() }?.reader()
+        if (reader != null) {
+            val data = gson.fromJson(reader, ProjectData::class.java)
+            return data
+        }
+        return null
+    }
 }
 
 class ProjectData(
@@ -23,5 +67,59 @@ class ProjectData(
     var remappedGameJarPath: Path?,
     var mappings: MappingBundle?,
     var mappingsName: String?,
-    var targetNamespace: String?
-)
+    var intermediaryNs: String?,
+    var targetNamespace: String?,
+    var manifestUrl: String?
+) {
+    internal constructor() : this(null, null, null, null, null, null, null, null)
+}
+
+class ProjectDataTypeAdapter : TypeAdapter<ProjectData>() {
+    override fun write(out: JsonWriter, value: ProjectData) {
+        out.beginObject()
+        out.serializeNulls = true
+        out.name("local_cache_dir").value(value.localCacheDir?.absolutePathString())
+        out.name("minecraft_version").value(value.minecraftVersion)
+        out.name("remapped_game_jar_path").value(value.remappedGameJarPath?.absolutePathString())
+        out.name("mappings_name").value(value.mappingsName)
+        out.name("target_namespace").value(value.targetNamespace)
+        out.endObject()
+    }
+
+    override fun read(r: JsonReader): ProjectData {
+        r.beginObject()
+        val data = ProjectData()
+        while (r.peek() != JsonToken.END_OBJECT) {
+            val name = r.nextName()
+            if (r.peek() == JsonToken.STRING) {
+                val value = r.nextString()
+                when (name) {
+                    "local_cache_dir" -> {
+                        data.localCacheDir = Path.of(value)
+                    }
+
+                    "minecraft_version" -> {
+                        data.minecraftVersion = value
+                    }
+
+                    "remapped_game_jar_path" -> {
+                        data.remappedGameJarPath = Path.of(value)
+                    }
+
+                    "mappings_name" -> {
+                        data.mappingsName = value
+                    }
+
+                    "target_namespace" -> {
+                        data.targetNamespace = value
+                    }
+                }
+            } else {
+                r.skipValue()
+            }
+        }
+        r.endObject()
+        return data
+    }
+
+}

src/main/kotlin/dev/frogmc/phytotelma/VersionChecker.kt

@@ -2,32 +2,33 @@
 
 package dev.frogmc.phytotelma
 
+import com.google.common.hash.Hashing
 import com.google.gson.Gson
 import com.google.gson.GsonBuilder
 import dev.frogmc.phytotelma.common.CachingHttpClient
 import org.gradle.api.Project
 import java.net.URI
 import java.nio.file.Path
-import kotlin.io.path.createDirectories
-import kotlin.io.path.exists
-import kotlin.io.path.writeBytes
-import kotlin.io.path.writeText
+import kotlin.io.path.*
 
 object VersionChecker {
     private var validVersions = mutableListOf<VersionUrl>()
     private var versionData: VersionData? = null
 
+    @Suppress("DEPRECATION")
     fun downloadClient(project: Project, version: String): Path {
 
-        fetchVersionData(version)
-        val clientData = fetchClientDownload(version)
+        fetchVersionData(project, version)
+        val clientData = fetchClientDownload(project, version)
         // download client data
         val downloadDirectory = PhytotelmaPlugin.globalCacheDir.resolve("net/minecraft/client/$version/")
         val downloadFile = downloadDirectory.resolve("client-$version.jar")
         if (!project.gradle.startParameter.isRefreshDependencies && downloadFile.exists()) {
-            println("Client already downloaded! Assuming it's valid. FIXME: Add checksum validation.")
-            return downloadFile
+            if (clientData.sha1 == Hashing.sha1().hashBytes(downloadFile.readBytes()).toString()) {
+                return downloadFile
+            }
         }
+        println("Downloading client...")
         downloadDirectory.createDirectories()
         val raw = rawDownload(clientData.url)
         downloadFile.writeBytes(raw)
@@ -46,39 +47,39 @@ object VersionChecker {
         dir.resolve("client-$version.pom").writeText(content)
     }
 
-    fun getDependencies(version: String, action: (String) -> Unit) {
-        fetchVersionData(version).libraries.map { it.name }.forEach {
+    fun getDependencies(project: Project, version: String, action: (String) -> Unit) {
+        fetchVersionData(project, version).libraries.map { it.name }.forEach {
             action.invoke(it)
         }
     }
 
-    fun validateVersion(version: String, ignoreCache: Boolean = false, offlineMode: Boolean): Boolean {
-        if (validVersions.isEmpty() || ignoreCache) getValidVersions(ignoreCache)
+    fun validateVersion(project: Project, version: String, ignoreCache: Boolean = false, offlineMode: Boolean): Boolean {
+        if (validVersions.isEmpty() || ignoreCache) getValidVersions(project, ignoreCache)
         if (!validVersions.any { it.id == version }) {
             if (!offlineMode) {
-                return validateVersion(version, ignoreCache = true, offlineMode = false)
+                return validateVersion(project, version, ignoreCache = true, offlineMode = false)
             }
             return false
         }
         return true
     }
 
-    fun getVersionUrl(version: String): String {
-        if (validVersions.isEmpty()) getValidVersions()
+    fun getVersionUrl(project: Project, version: String): String {
+        if (validVersions.isEmpty()) getValidVersions(project)
         return validVersions.first { it.id == version }.url
     }
 
-    fun fetchVersionData(version: String): VersionData {
+    fun fetchVersionData(project: Project, version: String): VersionData {
         if (versionData == null || versionData!!.id != version) {
-            val url = getVersionUrl(version)
+            val url = getVersionUrl(project, version)
             val response = getUrl(url)
             versionData = Gson().fromJson(response, VersionData::class.java)
         }
         return versionData!!
     }
 
-    fun fetchClientDownload(version: String): VersionClientData {
-        return fetchVersionData(version).downloads.client
+    fun fetchClientDownload(project: Project, version: String): VersionClientData {
+        return fetchVersionData(project, version).downloads.client
     }
 
     private fun rawDownload(url: String): ByteArray {
@@ -89,12 +90,12 @@ object VersionChecker {
         return CachingHttpClient.getString(URI.create(url), ignoreCache)
     }
 
-    private fun getValidVersions(ignoreCache: Boolean = false) {
+    private fun getValidVersions(project: Project, ignoreCache: Boolean = false) {
         if (validVersions.isNotEmpty() && !ignoreCache) return
         // get json from https://piston-meta.mojang.com/mc/game/version_manifest_v2.json
         // make http request
 
-        val url = "https://piston-meta.mojang.com/mc/game/version_manifest_v2.json"
+        val url = ProjectStorage.get(project).manifestUrl!!
         val response = getUrl(url, ignoreCache)
         // response is in format of {versions: [{id: "1.17.1", type: "release"}, ...]}
         // parse json

src/main/kotlin/dev/frogmc/phytotelma/accesswidener/AccessWidener.kt

@@ -4,6 +4,7 @@ import com.electronwill.nightconfig.core.file.FileNotFoundAction
 import com.electronwill.nightconfig.toml.TomlParser
 import com.google.common.hash.Hashing
 import dev.frogmc.phytotelma.Constants
+import dev.frogmc.phytotelma.getId
 import org.gradle.api.Project
 import org.gradle.api.artifacts.ProjectDependency
 import org.gradle.api.plugins.JavaPlugin
@@ -22,7 +23,7 @@ object AccessWidener {
 
     private val PARSER = TomlParser()
 
-    private val awHashes = mutableMapOf<Project, String>()
+    private val awHashes = mutableMapOf<String, String>()
     private val HEADER = Pattern.compile("accessWidener\\s+v[12]\\s+.*").asMatchPredicate()
     private val SEPARATOR = "[\\t ]+".toRegex()
 
@@ -65,14 +66,18 @@ object AccessWidener {
     fun needsUpdate(project: Project): Boolean {
         getAWFile(project)?.let {
             val hash = Hashing.sha256().hashBytes(it.readBytes()).toString()
-            if (!awHashes.containsKey(project) || hash != awHashes[project]) {
-                awHashes[project] = hash
+            if (!awHashes.containsKey(project.getId()) || hash != awHashes[project.getId()]) {
+                awHashes[project.getId()] = hash
                 return true
             }
         }
         return false
     }
 
+    fun hasAW(project: Project): Boolean {
+        return getAWFile(project) != null
+    }
+
     fun checkAW(path: Path, gamePath: Path) {
         val reader = path.bufferedReader(StandardCharsets.UTF_8)
         if (!HEADER.test(reader.readLine() ?: "")) {
@@ -80,7 +85,7 @@ object AccessWidener {
         }
         FileSystems.newFileSystem(gamePath).use { fs ->
             reader.lines().toList().forEachIndexed { index, line ->
-                val checkString = line.substring(0, line.indexOf("#"))
+                val checkString = if (line.contains("#")) line.substring(0, line.indexOf("#")) else line
 
                 if (checkString.isNotEmpty()) {
                     val parts = checkString.split(SEPARATOR)
@@ -89,9 +94,10 @@ object AccessWidener {
                     }
                     if (parts[1] == "class") {
                         val target = parts[2]
-                        if (fs.getPath(target).notExists()) {
+                        if (fs.getPath("/$target.class").notExists()) {
                             error("AccessWidener validation failed in line ${index + 2}: $line (Invalid target)")
                         }
+                        return@forEachIndexed
                     }
                     if (parts.size < 5) {
                         error("AccessWidener validation failed in line ${index + 2}: $line (Declaration missing)")
@@ -101,16 +107,17 @@ object AccessWidener {
                     val desc = parts[4]
                     when (parts[1]) {
                         "method" -> {
-                            val classReader = ClassReader(fs.getPath(owner).readBytes())
+                            val classReader = ClassReader(fs.getPath("/$owner.class").readBytes())
                             val node = ClassNode()
                             classReader.accept(node, 0)
                             if (node.methods.none { it.name.equals(name) && it.desc.equals(desc) }) {
-                                error("AccessWidener validation failed in line ${index + 2}: $line (Could not find target method)")
+                                val similar = "\nSimilar methods:\n ${node.methods.filter { it.name.equals(name) || it.desc.equals(desc) }.joinToString("\n") { it.name+" ${it.desc}" }}"
+                                error("AccessWidener validation failed in line ${index + 2}: $line (Could not find target method)"+ if (node.methods.any { it.name.equals(name) || it.desc.equals(desc) }) similar else "")
                             }
                         }
 
                         "field" -> {
-                            val classReader = ClassReader(fs.getPath(owner).readBytes())
+                            val classReader = ClassReader(fs.getPath("/$owner.class").readBytes())
                             val node = ClassNode()
                             classReader.accept(node, 0)
                             if (node.fields.none { it.name.equals(name) && it.desc.equals(desc) }) {
@@ -135,7 +142,8 @@ object AccessWidener {
 
     private fun readTransitiveAW(path: Path): List<String> {
         return path.bufferedReader(StandardCharsets.UTF_8).takeIf { HEADER.test(it.readLine() ?: "") }?.lines()
-            ?.filter { it.startsWith("transitive-") }?.toList() ?: emptyList()
+            ?.filter { it.startsWith("transitive-") }
+            ?.map { it.replace("transitive-", "") }?.toList() ?: emptyList()
     }
 
     private fun readAllAWs(project: Project): Stream<Entry> {

src/main/kotlin/dev/frogmc/phytotelma/build/PhytotelmaBuildTask.kt

@@ -1,15 +1,10 @@
 package dev.frogmc.phytotelma.build
 
-import com.electronwill.nightconfig.core.CommentedConfig
-import com.electronwill.nightconfig.core.file.FileNotFoundAction
-import com.electronwill.nightconfig.core.io.WritingMode
-import com.electronwill.nightconfig.toml.TomlParser
-import com.electronwill.nightconfig.toml.TomlWriter
 import dev.frogmc.phytotelma.Constants
 import dev.frogmc.phytotelma.ProjectStorage
-import dev.frogmc.phytotelma.nest.Nester
 import org.gradle.api.DefaultTask
 import org.gradle.api.tasks.OutputFile
+import org.gradle.api.tasks.TaskAction
 import org.gradle.api.tasks.bundling.AbstractArchiveTask
 import java.nio.charset.StandardCharsets
 import java.nio.file.FileSystems
@@ -28,7 +23,6 @@ abstract class PhytotelmaBuildTask : DefaultTask() {
 
     init {
         group = Constants.TASK_GROUP
-        val includeConfiguration = project.configurations.findByName(Constants.INCLUDE_CONFIGURATION)
 
         val jarTask = project.tasks.getByName("jar")
         dependsOn.add(jarTask)
@@ -41,39 +35,28 @@ abstract class PhytotelmaBuildTask : DefaultTask() {
         outputFile = outFile
         outputs.upToDateWhen { false }
         inputs.files(jarTask.outputs)
+    }
 
-        actions.add { task ->
-            task.inputs.files.forEach { file ->
-                if (file.name.endsWith(".jar") && !(file.name.contains("-dev.") || file.name.contains("-sources."))) {
-                    Files.copy(file.toPath(), outFile, StandardCopyOption.REPLACE_EXISTING)
-                    FileSystems.newFileSystem(outFile).use { fs ->
-                        if (includeConfiguration != null) {
-                            val jijPath = fs.getPath("META-INF/jars")
-                            val files = Nester.run(includeConfiguration, jijPath).map { it.toml() }.toList()
-                            if (files.isNotEmpty()) {
-                                val manifest = fs.getPath(Constants.MOD_METADATA_FILE)
-                                val config: CommentedConfig =
-                                    TomlParser().parse(manifest, FileNotFoundAction.THROW_ERROR)
-                                if (!config.add("frog.extensions.included_jars", files)) {
-                                    println("Failed to add included jars to mod manifest, make sure it doesn't include a key at 'frog.extensions.included_jars'!")
-                                }
-                                TomlWriter().write(config, manifest, WritingMode.REPLACE)
-                            }
-                        }
-                        val manifest = fs.getPath("META-INF/MANIFEST.MF")
-                        val lines = manifest.readLines().filter { it.isNotBlank() }
-                            .plus(
-                                """
+    @TaskAction
+    fun process() {
+        this.inputs.files.forEach { file ->
+            if (file.name.endsWith(".jar") && !(file.name.contains("-dev.") || file.name.contains("-sources."))) {
+                Files.copy(file.toPath(), outputFile, StandardCopyOption.REPLACE_EXISTING)
+                FileSystems.newFileSystem(outputFile).use { fs ->
+
+                    val manifest = fs.getPath("META-INF/MANIFEST.MF")
+                    val lines = manifest.readLines().filter { it.isNotBlank() }
+                        .plus(
+                            """
                                     Built-By: Phytotelma ${this.javaClass.`package`.implementationVersion}
-                                    Target-Namespace: Mojmap
+                                    Target-Namespace: ${ProjectStorage.get(project).intermediaryNs}
                                     Built-For: Minecraft ${ProjectStorage.get(project).minecraftVersion}
                                     Build-Date: ${LocalDateTime.now()}
                                     """.trimIndent()
-                            )
-                        manifest.writeLines(lines, StandardCharsets.UTF_8)
-                    }
-                    println("Built mod to ${outFile.toUri()}")
+                        )
+                    manifest.writeLines(lines, StandardCharsets.UTF_8)
                 }
+                println("Built mod to ${outputFile.toUri()}")
             }
         }
     }

src/main/kotlin/dev/frogmc/phytotelma/ext/MinecraftConfiguration.kt

@@ -1,5 +1,6 @@
 package dev.frogmc.phytotelma.ext
 
+import dev.frogmc.phytotelma.Constants
 import dev.frogmc.phytotelma.PhytotelmaPlugin
 import dev.frogmc.phytotelma.mappings.filterClasses
 import dev.frogmc.phytotelma.mappings.renameDstNamespace
@@ -27,6 +28,8 @@ abstract class MinecraftConfiguration @Inject constructor(
 
     val version: Property<String> = objects.property(String::class.java).unset()
     var mappings: Provider<MappingBundle> = mojmapParchment()
+    val intermediaryNamespace: Property<String> = objects.property(String::class.java).convention(Constants.MOJMAP_NAMESPACE)
+    val manifestUrl: Property<String> = objects.property(String::class.java).convention(Constants.MOJANG_MANIFEST_URL)
     internal lateinit var mappingsName: String
     internal lateinit var targetNamespace: String
 
@@ -43,7 +46,7 @@ abstract class MinecraftConfiguration @Inject constructor(
             val cacheDir = PhytotelmaPlugin.globalCacheDir
 
             mappingsName = "mojmap(${version.get()})+parchment(${conf.gameVersion.get()}, ${conf.version.get()})"
-            targetNamespace = "mojmap"
+            targetNamespace = Constants.MOJMAP_NAMESPACE
 
             return@provider MappingBundle.merge(
                 MojmapProvider.get(
@@ -52,7 +55,7 @@ abstract class MinecraftConfiguration @Inject constructor(
                 ).orElseThrow().reverse(),
                 ParchmentProvider.getParchment(
                     version.get(),
-                    cacheDir.resolve("org/parchmentmc/parchment/${conf.gameVersion}/${conf.version}")
+                    cacheDir.resolve("org/parchmentmc/parchment/${conf.gameVersion.get()}/${conf.version.get()}")
                 )
             ).renameDstNamespace(targetNamespace)
         }
@@ -72,7 +75,7 @@ abstract class MinecraftConfiguration @Inject constructor(
             return@provider ParchmentProvider.getParchment(
                 version.get(),
                 cacheDir.resolve("org/parchmentmc/parchment/${conf.gameVersion.get()}/${conf.version.get()}")
-            ).renameNamespaces("mojmap", "parchment")
+            ).renameNamespaces(Constants.MOJMAP_NAMESPACE, "parchment")
         }
     }
 
@@ -80,7 +83,7 @@ abstract class MinecraftConfiguration @Inject constructor(
         return project.provider {
             val cacheDir = PhytotelmaPlugin.globalCacheDir
             mappingsName = "mojmap(${version.get()})"
-            targetNamespace = "mojmap"
+            targetNamespace = Constants.MOJMAP_NAMESPACE
             return@provider MojmapProvider.get(
                 version.get(),
                 cacheDir.resolve("net/minecraft/client/${version.get()}/client-${version.get()}.txt")
@@ -101,8 +104,7 @@ abstract class MinecraftConfiguration @Inject constructor(
             return@provider twoStepMappings(
                 "net.fabricmc:intermediary:${version.get()}:v2",
                 "org.quiltmc:quilt-mappings:${conf.version.get()}:intermediary-v2"
-            ).filterClasses { !it.startsWith("net/minecraft/unmapped") }
-                .flatten(true).renameDstNamespace(targetNamespace)
+            ).flatten().renameDstNamespace(targetNamespace)
         }
     }
 
@@ -119,8 +121,24 @@ abstract class MinecraftConfiguration @Inject constructor(
             return@provider twoStepMappings(
                 "net.fabricmc:intermediary:${version.get()}:v2",
                 "net.fabricmc:yarn:${conf.version.get()}:v2"
-            ).filterClasses { !it.startsWith("net/minecraft/class_") }
-                .flatten(true).renameDstNamespace(targetNamespace)
+            ).flatten(true).renameDstNamespace(targetNamespace)
+        }
+    }
+
+    fun feather(action: Action<VersionConfiguration>): Provider<MappingBundle> {
+        return project.provider {
+            val conf = objects.newInstance(VersionConfiguration::class.java)
+            action.execute(conf)
+            if (!conf.version.isPresent) {
+                error("No version provided for yarn!")
+            }
+            mappingsName = "yarn(${conf.version.get()})"
+            targetNamespace = "yarn"
+            // Use qm via intermediary because hashed publications are broken
+            return@provider twoStepMappings(
+                "net.ornithemc:calamus-intermediary:${version.get()}:v2",
+                "net.fabricmc:yarn:${conf.version.get()}:v2"
+            ).flatten(true).renameDstNamespace(targetNamespace)
         }
     }
 
@@ -178,12 +196,15 @@ abstract class MinecraftConfiguration @Inject constructor(
             var name = "layer["
 
             val layers = conf.layers.get().mapIndexed { index, provider ->
-                val bundle = (provider.get() as MappingBundle).flatten(true)
                 if (index == 0) {
+                    val bundle = (provider.get() as MappingBundle).flatten()
                     name += mappingsName
                     back.insert(bundle)
                     return@mapIndexed bundle
                 }
+                val bundle = (provider.get() as MappingBundle)
+                        .filterClasses { !it.startsWith("net/minecraft/unmapped") && !it.startsWith("net/minecraft/class_") }
+                        .flatten(true)
                 name += ", $mappingsName"
 
                 back = back.flatten(false)

src/main/kotlin/dev/frogmc/phytotelma/ext/PhytotelmaGradleExtension.kt

@@ -1,5 +1,6 @@
 package dev.frogmc.phytotelma.ext
 
+import dev.frogmc.phytotelma.ext.datagen.DatagenExtension
 import org.gradle.api.Action
 
 @Suppress("unused")
@@ -10,4 +11,6 @@ interface PhytotelmaGradleExtension {
     fun loader(action: Action<VersionConfiguration>)
 
     fun froglib(action: Action<VersionConfiguration>)
+
+    fun datagen(action: Action<DatagenExtension>)
 }

src/main/kotlin/dev/frogmc/phytotelma/ext/PhytotelmaGradleExtensionImpl.kt

@@ -4,12 +4,19 @@ import dev.frogmc.phytotelma.Constants
 import dev.frogmc.phytotelma.ProjectStorage
 import dev.frogmc.phytotelma.VersionChecker
 import dev.frogmc.phytotelma.accesswidener.AccessWidener
+import dev.frogmc.phytotelma.ext.datagen.DatagenExtension
 import dev.frogmc.phytotelma.run.AssetDownloader
 import dev.frogmc.phytotelma.run.RunConfigGenerator
+import dev.frogmc.phytotelma.run.RuntimeAccessFixVisitor
+import dev.frogmc.phytotelma.run.datagen.DatagenConfigGenerator
+import dev.frogmc.phytotelma.run.datagen.DatagenTask
+import dev.frogmc.thyroxine.RemappingStep
 import dev.frogmc.thyroxine.Thyroxine
+import dev.frogmc.thyroxine.api.data.MappingData
 import org.gradle.api.Action
 import org.gradle.api.Project
 import org.gradle.api.model.ObjectFactory
+import java.nio.file.Files
 import javax.inject.Inject
 import kotlin.io.path.createParentDirectories
 import kotlin.io.path.notExists
@@ -28,7 +35,7 @@ abstract class PhytotelmaGradleExtensionImpl @Inject constructor(
         }
         val version = mcConf.version.get()
 
-        if (VersionChecker.validateVersion(version, offlineMode = project.gradle.startParameter.isOffline)) {
+        if (VersionChecker.validateVersion(project, version, offlineMode = project.gradle.startParameter.isOffline)) {
 
             val projectData = ProjectStorage.get(project)
             projectData.minecraftVersion = version
@@ -42,7 +49,8 @@ abstract class PhytotelmaGradleExtensionImpl @Inject constructor(
                 projectData.localCacheDir!!.resolve("net/minecraft/client/$version/client-$version-remapped.jar")
             remappedJar.createParentDirectories()
             projectData.remappedGameJarPath = remappedJar
-            val applyAW = AccessWidener.needsUpdate(project)
+            var applyAW = AccessWidener.needsUpdate(project)
+            projectData.intermediaryNs = mcConf.intermediaryNamespace.get()
             if (remappedJar.notExists() || applyAW || mcConf.mappingsName != projectData.mappingsName) {
                 projectData.mappingsName = mcConf.mappingsName
                 println("Remapping the game...")
@@ -51,25 +59,39 @@ abstract class PhytotelmaGradleExtensionImpl @Inject constructor(
                     mappings.forNamespaces("official", mcConf.targetNamespace),
                     clientJar, remappedJar, true, true
                 )
+                VersionChecker.savePomFile(version, remappedJar.parent)
+                RunConfigGenerator.generate(project)
+                applyAW = AccessWidener.hasAW(project)
             }
 
             project.dependencies.add(
                 Constants.MINECRAFT_CONFIGURATION,
                 "net.minecrell:terminalconsoleappender:1.2.0"
             )
-            VersionChecker.getDependencies(version) {
+            VersionChecker.getDependencies(project, version) {
                 project.dependencies.add(Constants.MINECRAFT_CONFIGURATION, it)
             }
-            VersionChecker.savePomFile(version, remappedJar.parent)
             project.dependencies.add(Constants.MINECRAFT_CONFIGURATION, "net.minecraft:client:$version:remapped")
 
-            RunConfigGenerator.generate(project)
             AssetDownloader.download(project)
 
             if (applyAW) {
                 project.afterEvaluate {
                     println("Applying AccessWideners...")
                     AccessWidener.apply(project, remappedJar)
+                    if (mcConf.targetNamespace != Constants.MOJMAP_NAMESPACE) {
+                        Thyroxine.remap(
+                            MappingData("", ""),
+                            remappedJar,
+                            remappedJar.resolveSibling(Constants.ALTERNATIVE_RUNTIME_JAR_NAME),
+                            false,
+                            listOf(RemappingStep { classVisitor, _ ->
+                                RuntimeAccessFixVisitor(classVisitor)
+                            })
+                        )
+                    } else {
+                        Files.deleteIfExists(remappedJar.resolveSibling(Constants.ALTERNATIVE_RUNTIME_JAR_NAME))
+                    }
                 }
             }
         }
@@ -81,7 +103,7 @@ abstract class PhytotelmaGradleExtensionImpl @Inject constructor(
         if (!conf.version.isPresent) {
             error("No loader version provided!")
         }
-        project.dependencies.add("implementation", "dev.frogmc:frogloader:${conf.version.get()}")
+        project.dependencies.add(Constants.MINECRAFT_CONFIGURATION, "dev.frogmc:frogloader:${conf.version.get()}")
     }
 
     override fun froglib(action: Action<VersionConfiguration>) {
@@ -92,4 +114,11 @@ abstract class PhytotelmaGradleExtensionImpl @Inject constructor(
         }
         project.dependencies.add("modImplementation", "dev.frogmc:froglib:${conf.version.get()}")
     }
+
+    override fun datagen(action: Action<DatagenExtension>) {
+        val conf = objects.newInstance(DatagenExtension::class.java)
+        action.execute(conf)
+        DatagenConfigGenerator.generate(project, conf)
+        project.tasks.register("runDatagen", DatagenTask::class.java, conf)
+    }
 }

src/main/kotlin/dev/frogmc/phytotelma/ext/datagen/DatagenExtension.kt

@@ -0,0 +1,12 @@
+package dev.frogmc.phytotelma.ext.datagen
+
+import org.gradle.api.Project
+import org.gradle.api.model.ObjectFactory
+import org.gradle.api.provider.Property
+import javax.inject.Inject
+
+abstract class DatagenExtension @Inject constructor(project: Project, objects: ObjectFactory) {
+
+    val generatorClass: Property<String> = objects.property(String::class.java).unset()
+
+}

src/main/kotlin/dev/frogmc/phytotelma/mixin/remapper/MixinAnnotationRemapper.kt

@@ -0,0 +1,270 @@
+package dev.frogmc.phytotelma.mixin.remapper
+
+import com.google.common.base.Strings
+import dev.frogmc.phytotelma.Constants
+import org.objectweb.asm.*
+import org.objectweb.asm.commons.AnnotationRemapper
+import org.objectweb.asm.commons.ClassRemapper
+import org.objectweb.asm.commons.FieldRemapper
+import org.objectweb.asm.commons.MethodRemapper
+import org.objectweb.asm.commons.Remapper
+import org.objectweb.asm.tree.ClassNode
+import java.nio.file.FileSystems
+import java.nio.file.Path
+import kotlin.io.path.exists
+import kotlin.io.path.readBytes
+
+class MixinAnnotationRemapper(
+    cv: ClassVisitor,
+    private val mapper: Remapper,
+    private val mojmapGameJar: Path
+) : ClassRemapper(Constants.ASM_VERSION, cv, mapper) {
+
+    private var target: String? = null
+    private var targetNode: ClassNode? = null
+
+    override fun visit(
+        version: Int,
+        access: Int,
+        name: String?,
+        signature: String?,
+        superName: String?,
+        interfaces: Array<out String>?
+    ) {
+        super.visit(version, access, name, signature, superName, interfaces)
+    }
+
+    override fun visitAnnotation(descriptor: String?, visible: Boolean): AnnotationVisitor? {
+        if (descriptor == null || descriptor != "Lorg/spongepowered/asm/mixin/Mixin;") {
+            return super.visitAnnotation(descriptor, visible)
+        }
+        return object : AnnotationVisitor(Constants.ASM_VERSION, super.visitAnnotation(descriptor, visible)) {
+            override fun visitArray(name: String?): AnnotationVisitor {
+                return object : AnnotationVisitor(Constants.ASM_VERSION, super.visitArray(name)) {
+                    override fun visit(none: String?, value: Any?) {
+                        var newVal = value
+                        if (value is Type) {
+                            target = value.internalName
+                        } else if (
+                            value is String
+                        ) {
+                            if (target == null) {
+                                target = value
+                            }
+                            newVal = mapper.map(value)
+                        }
+
+                        super.visit(none, newVal)
+                    }
+                }
+            }
+
+            override fun visit(name: String?, value: Any?) {
+                val newVal = when (value) {
+                    is String -> {
+                        target = value
+                        mapper.map(value)
+                    }
+
+                    is Type -> {
+                        target = value.internalName
+                        value
+                    }
+
+                    else -> value
+                }
+
+                super.visit(name, newVal)
+            }
+
+            override fun visitEnd() {
+                if (target != null) {
+                    targetNode = ClassNode()
+                    FileSystems.newFileSystem(mojmapGameJar).use { fs ->
+                        fs.getPath("$target.class").takeIf { it.exists() }
+                            ?.readBytes()?.let(::ClassReader).let { it?.accept(targetNode, 0) }
+                    }
+                }
+                super.visitEnd()
+            }
+        }
+    }
+
+    override fun visitMethod(
+        access: Int,
+        name: String?,
+        descriptor: String?,
+        signature: String?,
+        exceptions: Array<out String>?
+    ): MethodVisitor? {
+        val newMethodName = target?.let { mapper.mapMethodName(it, name, descriptor) }?: name
+        return super.visitMethod(access, newMethodName, descriptor, signature, exceptions)?.let {
+            if (targetNode != null) {
+                MixinMethodVisitor(it, mapper, targetNode!!)
+            } else it
+        }
+    }
+
+    override fun visitField(
+        access: Int,
+        name: String?,
+        descriptor: String?,
+        signature: String?,
+        value: Any?
+    ): FieldVisitor? {
+        val newFieldName = target?.let { mapper.mapFieldName(it, name, descriptor) }?:name
+        return super.visitField(access, newFieldName, descriptor, signature, value)?.let {
+            if (targetNode != null) {
+                MixinFieldVisitor(it, mapper, targetNode!!)
+            } else it
+        }
+    }
+
+    class MixinFieldVisitor(fv: FieldVisitor, private val mapper: Remapper, private val targetNode: ClassNode) :
+        FieldRemapper(Constants.ASM_VERSION, fv, mapper) {
+        override fun visitAnnotation(descriptor: String?, visible: Boolean): AnnotationVisitor {
+            return MixinAnnotationVisitor(super.visitAnnotation(descriptor, visible), descriptor!!, mapper, targetNode)
+        }
+    }
+
+    class MixinMethodVisitor(mv: MethodVisitor, private val mapper: Remapper, private val targetNode: ClassNode) :
+        MethodRemapper(Constants.ASM_VERSION, mv, mapper) {
+        override fun visitAnnotation(descriptor: String?, visible: Boolean): AnnotationVisitor {
+            return MixinAnnotationVisitor(super.visitAnnotation(descriptor, visible), descriptor!!, mapper, targetNode)
+        }
+    }
+
+    class MixinAnnotationVisitor(
+        av: AnnotationVisitor,
+        private val desc: String,
+        private val mapper: Remapper,
+        private val owner: ClassNode,
+        private var annotationName: String = ""
+    ) :
+        AnnotationRemapper(Constants.ASM_VERSION, desc, av, mapper) {
+
+        override fun visitAnnotation(name: String?, descriptor: String?): AnnotationVisitor {
+            return MixinAnnotationVisitor(super.visitAnnotation(name, descriptor), descriptor!!, mapper, owner)
+        }
+
+        override fun visitArray(name: String?): AnnotationVisitor {
+            return MixinAnnotationVisitor(super.visitArray(name), desc, mapper, owner, name!!)
+        }
+
+        override fun visit(n: String?, value: Any?) {
+            val name = n ?: annotationName
+            var newVal = value
+            if (value is String) {
+                if (desc == "Lorg/spongepowered/asm/mixin/gen/Invoker;") {
+                    val methodName = value.substringBefore("(")
+                    val desc = value.indexOf("(").takeIf { it > -1 }?.let(value::substring)
+                    if (desc == null) {
+                        val method = owner.methods.find { it.name == methodName }
+                        if (method != null) {
+                            newVal = mapper.mapMethodName(owner.name, methodName, method.desc)
+                        }
+                    } else {
+                        newVal = mapper.mapMethodName(owner.name, methodName, desc)
+                    }
+                } else if (desc == "Lorg/spongepowered/asm/mixin/gen/Accessor;") {
+                    val field = owner.fields.find { it.name == value }
+                    if (field != null) {
+                        newVal = mapper.mapFieldName(owner.name, value, field.desc)
+                    }
+                } else if (name == "aliases") {
+                    val field = owner.fields.find { it.name == value }
+                    if (field != null) {
+                        newVal = mapper.mapFieldName(owner.name, value, field.desc)
+                    }
+                } else if (name == "method") {
+                    val methodName = value.substringBefore("(")
+                    val desc = value.indexOf("(").takeIf { it > -1 }?.let(value::substring)
+                    if (desc == null) {
+                        val method = owner.methods.find { it.name == methodName }
+                        if (method != null) {
+                            val newName = mapper.mapMethodName(
+                                owner.name,
+                                methodName,
+                                method.desc
+                            )
+                            newVal = newName + mapper.mapMethodDesc(method.desc)
+                        }
+                    } else {
+                        val newName = mapper.mapMethodName(
+                            owner.name,
+                            methodName,
+                            desc
+                        )
+                        newVal = newName + mapper.mapMethodDesc(desc)
+                    }
+
+                } else if (name == "target") {
+                    newVal = remapMemberInfo(value, mapper)
+                }
+            }
+            super.visit(name, newVal)
+        }
+
+        private fun remapMemberInfo(input: String, mapper: Remapper): String {
+            var desc: String? = null
+            var owner: String? = null
+            var name = Strings.nullToEmpty(input).replace("\\s".toRegex(), "")
+            var tail = ""
+
+            val arrowPos: Int = name.indexOf("->")
+            if (arrowPos > -1) {
+                tail = name.substring(arrowPos + 2)
+                name = name.substring(0, arrowPos)
+            }
+
+            val lastDotPos = name.lastIndexOf('.')
+            val semiColonPos = name.indexOf(';')
+            if (lastDotPos > -1) {
+                owner = name.substring(0, lastDotPos).replace('.', '/')
+                name = name.substring(lastDotPos + 1)
+            } else if (semiColonPos > -1 && name.startsWith("L")) {
+                owner = name.substring(1, semiColonPos).replace('.', '/')
+                name = name.substring(semiColonPos + 1)
+            }
+
+            val parenPos = name.indexOf('(')
+            val colonPos = name.indexOf(':')
+            if (parenPos > -1) {
+                desc = name.substring(parenPos)
+                name = name.substring(0, parenPos)
+            } else if (colonPos > -1) {
+                desc = name.substring(colonPos + 1)
+                name = name.substring(0, colonPos)
+            }
+
+            if ((name.indexOf('/') > -1 || name.indexOf('.') > -1) && owner == null) {
+                owner = name
+                name = ""
+            }
+
+
+            var quantifier = ""
+            if (name.endsWith("*")) {
+                quantifier = "*"
+                name = name.substring(0, name.length - 1)
+            } else if (name.endsWith("+")) {
+                quantifier = "+"
+                name = name.substring(0, name.length - 1)
+            } else if (name.endsWith("}")) {
+                quantifier = ""
+                val bracePos = name.indexOf("{")
+                if (bracePos >= 0) {
+                    quantifier = name.substring(bracePos)
+                    name = name.substring(0, bracePos)
+                }
+            } else if (name.indexOf("{") >= 0) {
+                quantifier = ""
+            }
+
+            val mappedOwner = mapper.map(owner!!)
+            val mappedDesc = mapper.mapMethodDesc(desc!!)
+            val mappedName = mapper.mapMethodName(owner, name, desc)
+            return "L$mappedOwner;$mappedName$mappedDesc$quantifier$tail"
+        }
+    }
+}

src/main/kotlin/dev/frogmc/phytotelma/nest/NestStripper.kt

@@ -0,0 +1,25 @@
+package dev.frogmc.phytotelma.nest
+
+import dev.frogmc.phytotelma.Constants
+import dev.frogmc.phytotelma.PhytotelmaPlugin
+import java.nio.file.FileSystems
+import java.nio.file.Path
+import kotlin.io.path.exists
+import kotlin.io.path.inputStream
+import kotlin.io.path.outputStream
+
+object NestStripper {
+
+    fun stripJij(modJar: Path) {
+        FileSystems.newFileSystem(modJar).use { fs ->
+            val path = fs.getPath(Constants.MOD_METADATA_FILE)
+                path.takeIf { it.exists() }?.apply {
+                val config = PhytotelmaPlugin.tomlParser.parse(this.inputStream())
+                config.remove<Any>("frog.extensions.included_jars")
+                PhytotelmaPlugin.tomlWriter.write(config, this.outputStream())
+            }
+
+        }
+
+    }
+}

src/main/kotlin/dev/frogmc/phytotelma/nest/Nester.kt

@@ -2,9 +2,9 @@ package dev.frogmc.phytotelma.nest
 
 import com.electronwill.nightconfig.core.Config
 import com.electronwill.nightconfig.core.UnmodifiableConfig
-import com.electronwill.nightconfig.toml.TomlParser
 import com.google.common.jimfs.Jimfs
 import dev.frogmc.phytotelma.Constants
+import dev.frogmc.phytotelma.PhytotelmaPlugin
 import org.gradle.api.artifacts.Configuration
 import org.gradle.api.artifacts.ProjectDependency
 import org.gradle.api.plugins.JavaPlugin
@@ -135,7 +135,7 @@ object Nester {
     }
 
     private fun readModId(toml: Path): String {
-        return TomlParser().parse(toml.inputStream()).get("frog.mod.id")
+        return PhytotelmaPlugin.tomlParser.parse(toml.inputStream()).get("frog.mod.id")
     }
 }
 

src/main/kotlin/dev/frogmc/phytotelma/run/AssetDownloader.kt

@@ -21,7 +21,7 @@ object AssetDownloader {
     fun download(project: Project, manualInvocation: Boolean = false) {
         val version = ProjectStorage.get(project).minecraftVersion!!
         val path = PhytotelmaPlugin.globalCacheDir.resolve("assets")
-        val assetIndex = VersionChecker.fetchVersionData(version).assetIndex
+        val assetIndex = VersionChecker.fetchVersionData(project, version).assetIndex
         val dest = path.resolve("indexes").resolve(assetIndex.id + ".json")
         var overwrite = manualInvocation
         if (dest.notExists()) {

src/main/kotlin/dev/frogmc/phytotelma/run/RunConfigGenerator.kt

@@ -1,5 +1,6 @@
 package dev.frogmc.phytotelma.run
 
+import dev.frogmc.phytotelma.Constants
 import dev.frogmc.phytotelma.PhytotelmaPlugin
 import dev.frogmc.phytotelma.ProjectStorage
 import dev.frogmc.phytotelma.VersionChecker
@@ -15,26 +16,29 @@ import kotlin.io.path.createParentDirectories
 import kotlin.io.path.notExists
 
 object RunConfigGenerator {
-    private const val LOG4J_CONFIG_PATH = ".gradle/phytotelma/log4j.xml"
-    private const val ASSET_DIR = "assets"
-    private val ADAPTERS = arrayOf(EclipseAdapter(), IdeaAdapter())
+    val ADAPTERS = arrayOf(EclipseAdapter(), IdeaAdapter())
 
     fun generate(project: Project) {
-        val log4jPath = project.rootDir.resolve(LOG4J_CONFIG_PATH).toPath().absolute()
-        if (log4jPath.notExists()) {
-            log4jPath.createParentDirectories()
-            RunConfigGenerator::class.java.getResourceAsStream("/log4j.xml").use { input ->
-                Files.copy(input!!, log4jPath)
-            }
-        }
 
-        val assetPath = PhytotelmaPlugin.globalCacheDir.resolve(ASSET_DIR).absolute()
+        val assetPath = PhytotelmaPlugin.globalCacheDir.resolve("assets").absolute()
         val assetIndexPath = assetPath.resolve("indexes")
         if (assetIndexPath.notExists()) {
             assetIndexPath.createDirectories()
         }
+        val indexId = VersionChecker.fetchVersionData(project, ProjectStorage.get(project).minecraftVersion!!).assetIndex.id
+        val log4jPath = project.rootDir.resolve(".gradle/phytotelma/log4j.xml").toPath().absolute()
+        if (log4jPath.notExists()) {
+            log4jPath.createParentDirectories()
+            this::class.java.getResourceAsStream("/log4j.xml").use { input ->
+                Files.copy(input!!, log4jPath)
+            }
+        }
+
         val projectData = ProjectStorage.get(project)
-        val indexId = VersionChecker.fetchVersionData(projectData.minecraftVersion!!).assetIndex.id
+        var runtimeGameJar = projectData.remappedGameJarPath!!
+        if (projectData.targetNamespace != Constants.MOJMAP_NAMESPACE) {
+            runtimeGameJar = runtimeGameJar.resolveSibling(Constants.ALTERNATIVE_RUNTIME_JAR_NAME)
+        }
 
         val projectName = if (project.rootDir == project.projectDir) "" else " (${project.name})"
 
@@ -50,14 +54,15 @@ object RunConfigGenerator {
                     mutableListOf(
                         "-Xmx${project.properties.getOrDefault("frogmc.gameHeap", "2048M")}",
                         "-Dfrogmc.development=true",
-                        "-Dfrogmc.plugin.minecraft.gameJar=${projectData.remappedGameJarPath}",
+                        "-Dfrogmc.plugin.minecraft.gameJar=${runtimeGameJar}",
                         "-Dlog4j2.configurationFile=$log4jPath",
-                        "-Dlog4j2.formatMsgLookups=true"
-                    ).apply {
+                        "-Dlog4j2.formatMsgNoLookups=true"
+                    ).also {
                         if (project.gradle.startParameter.consoleOutput != ConsoleOutput.Plain) {
-                            add("-Dfrogmc.log.disableAnsi=false")
+                            it.add("-Dfrogmc.log.disableAnsi=false")
                         }
-                    }.toTypedArray(), if (env == Env.CLIENT) {
+                    }.toTypedArray(),
+                    if (env == Env.CLIENT) {
                         arrayOf(
                             "--assetsDir", assetPath.toString(),
                             "--version", "FrogMC",

src/main/kotlin/dev/frogmc/phytotelma/run/RuntimeAccessFixVisitor.kt

@@ -0,0 +1,49 @@
+package dev.frogmc.phytotelma.run
+
+import dev.frogmc.phytotelma.Constants
+import org.objectweb.asm.ClassVisitor
+import org.objectweb.asm.FieldVisitor
+import org.objectweb.asm.MethodVisitor
+import org.objectweb.asm.Opcodes
+
+class RuntimeAccessFixVisitor(cv: ClassVisitor): ClassVisitor(Constants.ASM_VERSION, cv) {
+
+    private fun fixAccess(access: Int): Int {
+        return if ((access and 0x7) != Opcodes.ACC_PRIVATE) (access and 0x7.inv()) or Opcodes.ACC_PUBLIC else access
+    }
+
+    override fun visit(
+        version: Int,
+        access: Int,
+        name: String?,
+        signature: String?,
+        superName: String?,
+        interfaces: Array<out String>?
+    ) {
+        super.visit(version, fixAccess(access), name, signature, superName, interfaces)
+    }
+
+    override fun visitField(
+        access: Int,
+        name: String?,
+        descriptor: String?,
+        signature: String?,
+        value: Any?
+    ): FieldVisitor {
+        return super.visitField(fixAccess(access), name, descriptor, signature, value)
+    }
+
+    override fun visitInnerClass(name: String?, outerName: String?, innerName: String?, access: Int) {
+        super.visitInnerClass(name, outerName, innerName, fixAccess(access))
+    }
+
+    override fun visitMethod(
+        access: Int,
+        name: String?,
+        descriptor: String?,
+        signature: String?,
+        exceptions: Array<out String>?
+    ): MethodVisitor {
+        return super.visitMethod(fixAccess(access), name, descriptor, signature, exceptions)
+    }
+}

src/main/kotlin/dev/frogmc/phytotelma/run/adapter/IdeaAdapter.kt

@@ -38,6 +38,7 @@ class IdeaAdapter : RunConfigAdapter {
         val runDir = project.projectDir.resolve("run")
         runDir.mkdirs()
 
+
         file.writer(StandardCharsets.UTF_8).use {
             it.write(
                 """
@@ -57,6 +58,7 @@ class IdeaAdapter : RunConfigAdapter {
                 """.trimIndent()
             )
         }
+
     }
 
     override fun shouldGenerate(): Boolean {

src/main/kotlin/dev/frogmc/phytotelma/run/datagen/DatagenConfigGenerator.kt

@@ -0,0 +1,66 @@
+package dev.frogmc.phytotelma.run.datagen
+
+import dev.frogmc.phytotelma.Constants
+import dev.frogmc.phytotelma.ProjectStorage
+import dev.frogmc.phytotelma.ext.datagen.DatagenExtension
+import dev.frogmc.phytotelma.run.RunConfigGenerator
+import org.gradle.api.Project
+import org.gradle.api.logging.configuration.ConsoleOutput
+import org.gradle.api.plugins.JavaPluginExtension
+import java.nio.file.Files
+import kotlin.io.path.absolute
+import kotlin.io.path.createParentDirectories
+import kotlin.io.path.notExists
+
+object DatagenConfigGenerator {
+
+    fun generate(project: Project, conf: DatagenExtension) {
+
+        val projectName = if (project.rootDir == project.projectDir) "" else " (${project.name})"
+
+        val log4jPath = project.rootDir.resolve(".gradle/phytotelma/log4j.xml").toPath().absolute()
+        if (log4jPath.notExists()) {
+            log4jPath.createParentDirectories()
+            this::class.java.getResourceAsStream("/log4j.xml").use { input ->
+                Files.copy(input!!, log4jPath)
+            }
+        }
+
+        val projectData = ProjectStorage.get(project)
+        var runtimeGameJar = projectData.remappedGameJarPath!!
+        if (projectData.targetNamespace != Constants.MOJMAP_NAMESPACE) {
+            runtimeGameJar = runtimeGameJar.resolveSibling(Constants.ALTERNATIVE_RUNTIME_JAR_NAME)
+        }
+
+        for (adapter in RunConfigGenerator.ADAPTERS) {
+            if (!adapter.shouldGenerate())
+                continue
+
+            adapter.generate(
+                project,
+                "Minecraft (Data Generation)$projectName",
+                "dev.frogmc.frogloader.impl.launch.server.FrogServer",
+                mutableListOf(
+                    "-Xmx${project.properties.getOrDefault("frogmc.gameHeap", "2048M")}",
+                    "-Dfrogmc.development=true",
+                    "-Dfrogmc.plugin.minecraft.gameJar=${runtimeGameJar}",
+                    "-Dlog4j2.configurationFile=$log4jPath",
+                    "-Dlog4j2.formatMsgNoLookups=true",
+                    "-Dfrog.datagen.enabled=true",
+                    "-Dfrog.datagen.modid=${Datagen.readModId(project)}",
+                    "-Dfrog.datagen.generator=${conf.generatorClass.get()}",
+                    "-Dfrog.datagen.output=${
+                        project.extensions.findByType(JavaPluginExtension::class.java)?.sourceSets?.maybeCreate(
+                            "generated"
+                        )?.resources?.srcDirs?.first()?.toString()
+                    }"
+                ).also {
+                    if (project.gradle.startParameter.consoleOutput != ConsoleOutput.Plain) {
+                        it.add("-Dfrogmc.log.disableAnsi=false")
+                    }
+                }.toTypedArray(),
+                arrayOf("--nogui")
+            )
+        }
+    }
+}

src/main/kotlin/dev/frogmc/phytotelma/run/datagen/DatagenTask.kt

@@ -0,0 +1,37 @@
+package dev.frogmc.phytotelma.run.datagen
+
+import com.electronwill.nightconfig.toml.TomlParser
+import dev.frogmc.phytotelma.Constants
+import dev.frogmc.phytotelma.common.Env
+import dev.frogmc.phytotelma.ext.datagen.DatagenExtension
+import dev.frogmc.phytotelma.run.task.RunGameTask
+import org.gradle.api.Project
+import org.gradle.api.plugins.JavaPluginExtension
+import javax.inject.Inject
+
+object Datagen {
+    fun readModId(project: Project): String {
+        project.extensions.findByType(JavaPluginExtension::class.java)?.sourceSets?.forEach { set ->
+            set.resources.filter { it.name == Constants.MOD_METADATA_FILE }.firstOrNull {
+                return TomlParser().parse(it.readText()).get("frog.mod.id")
+            }
+        }
+        error("Mod ID could not be read!")
+    }
+}
+
+abstract class DatagenTask @Inject constructor(conf: DatagenExtension) : RunGameTask(Env.SERVER) {
+
+    init {
+        val output = project.extensions.findByType(JavaPluginExtension::class.java)?.sourceSets?.maybeCreate(
+            "generated"
+        )?.resources?.srcDirs?.first()?.toString()
+        jvmArguments.addAll(
+            "-Dfrog.datagen.enabled=true",
+            "-Dfrog.datagen.modid=${Datagen.readModId(project)}",
+            "-Dfrog.datagen.generator=${conf.generatorClass.get()}",
+            "-Dfrog.datagen.output=${output}"
+        )
+    }
+}
+

src/main/kotlin/dev/frogmc/phytotelma/run/task/RunGameTask.kt

@@ -29,7 +29,7 @@ abstract class RunGameTask @Inject constructor(env: Env) : JavaExec() {
         if (assetIndexPath.notExists()) {
             assetIndexPath.createDirectories()
         }
-        val indexId = VersionChecker.fetchVersionData(ProjectStorage.get(project).minecraftVersion!!).assetIndex.id
+        val indexId = VersionChecker.fetchVersionData(project, ProjectStorage.get(project).minecraftVersion!!).assetIndex.id
         val log4jPath = project.rootDir.resolve(".gradle/phytotelma/log4j.xml").toPath().absolute()
         if (log4jPath.notExists()) {
             log4jPath.createParentDirectories()
@@ -54,10 +54,16 @@ abstract class RunGameTask @Inject constructor(env: Env) : JavaExec() {
             SourceSet.MAIN_SOURCE_SET_NAME
         ).runtimeClasspath.filter { it.exists() })
 
+        val projectData = ProjectStorage.get(project)
+        var runtimeGameJar = projectData.remappedGameJarPath!!
+        if (projectData.targetNamespace != Constants.MOJMAP_NAMESPACE) {
+            runtimeGameJar = runtimeGameJar.resolveSibling(Constants.ALTERNATIVE_RUNTIME_JAR_NAME)
+        }
+
         jvmArguments.addAll(
             "-Xmx${project.properties.getOrDefault("frogmc.gameHeap", "2048M")}",
             "-Dfrogmc.development=true",
-            "-Dfrogmc.plugin.minecraft.gameJar=${ProjectStorage.get(project).remappedGameJarPath}",
+            "-Dfrogmc.plugin.minecraft.gameJar=${runtimeGameJar}",
             "-Dlog4j2.configurationFile=$log4jPath",
             "-Dlog4j2.formatMsgNoLookups=true",
             writeArgFile()
@@ -68,6 +74,7 @@ abstract class RunGameTask @Inject constructor(env: Env) : JavaExec() {
         }
 
         mainClass.set("dev.frogmc.frogloader.impl.launch.${env.id}.Frog${env.pascalName}")
+        setStandardInput(System.`in`)
     }
 
     private fun writeArgFile(): String {