0.1

Author: isXander

.gitignore

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+/.idea
+/build
+/.gradle
+/run

build.gradle.kts

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+plugins {
+    kotlin("jvm") version "1.5.31"
+}
+
+group = "org.bundleproject"
+version = "0.1"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    val ktorVersion: String by project
+
+    implementation("org.jetbrains.kotlin:kotlin-stdlib:1.5.31")
+    implementation("org.jetbrains.kotlin:kotlin-reflect:1.5.31")
+
+    implementation("io.ktor:ktor-client-core:$ktorVersion")
+    implementation("io.ktor:ktor-client-apache:$ktorVersion")
+    implementation("io.ktor:ktor-client-gson:$ktorVersion")
+}

gradle/wrapper/gradle-wrapper.jar

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradle/wrapper/gradle-wrapper.properties

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+rootProject.name = "Launchwrapper"
+

gradlew

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+package org.bundleproject.launchwrapper
+
+import org.bundleproject.launchwrapper.utils.bundleClassName
+import org.bundleproject.launchwrapper.utils.err
+import org.bundleproject.launchwrapper.utils.get
+import org.bundleproject.launchwrapper.utils.info
+import java.io.File
+import kotlin.reflect.KClass
+import kotlin.reflect.full.callSuspend
+import kotlin.reflect.full.createType
+import kotlin.reflect.full.functions
+import kotlin.reflect.full.primaryConstructor
+
+val fallbackEntrypoints = arrayOf(
+    "net.fabricmc.loader.launch.knot.KnotClient",
+    "cpw.mods.bootstraplauncher.BootstrapLauncher",
+    "net.minecraft.launchwrapper.Launch",
+    "org.bookmc.loader.impl.launch.Quilt",
+    "com.github.glassmc.loader.client.GlassClientMain",
+    "net.minecraft.client.main.Main", // just in case user installed to vanilla
+)
+
+suspend fun launch(args: Array<String>, gameDir: File, classLoader: ClassLoader) {
+    (args["bundleMainClass"]?.let { Class.forName(it).kotlin } ?: findEntrypoint())?.run {
+        val version = args["version"]
+            ?.takeIf { it != "MultiMC5" }
+        val modFolderName = "mods"
+
+        val bundleClass = runCatching { Class.forName(bundleClassName, true, classLoader).kotlin }
+            .onFailure {
+                err("Bundle is not in the classpath! Cannot launch bundle!")
+                return@launch
+            }
+            .getOrThrow()
+
+        info("Invoking constructor...")
+        bundleClass.constructors.find { it.typeParameters[1] == String::class.createType() }
+            ?.call(gameDir, version, modFolderName)
+
+        info("Starting Bundle... Goodbye, Launchwrapper...")
+        bundleClass.functions.find { it.name == "start" }?.callSuspend()
+    }
+}
+
+private fun findEntrypoint(): KClass<*>? {
+    err("Relying on fallback entrypoint! Please re-install bundle!")
+    fallbackEntrypoints.forEach {
+        runCatching { Class.forName(it) }
+            .onSuccess { return it.kotlin }
+    }
+
+    return null
+}

gradlew.bat

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+package org.bundleproject.launchwrapper
+
+import java.io.File
+import java.net.URLClassLoader
+
+fun load(gameDir: File, version: String): URLClassLoader {
+    val bundleFolder = File(gameDir, "bundle")
+    val jarsFolder = File(bundleFolder, "jars")
+
+    val bundleJar = File(jarsFolder, "bundle-$version.jar")
+    val bundleJarUrl = bundleJar.toURI().toURL()
+
+    return URLClassLoader(arrayOf(bundleJarUrl))
+}