Skip installing forge while extract files exist.

build.gradle

@@ -5,7 +5,7 @@ apply plugin: "idea"
 
 sourceCompatibility = targetCompatibility = 1.8
 
-version = "1.3.0"
+version = "1.3.1"
 group = "io.github.zekerzhayard"
 archivesBaseName = rootProject.name
 

src/main/java/io/github/zekerzhayard/forgewrapper/installer/ClientInstall4MultiMC.java

@@ -1,10 +1,8 @@
 package io.github.zekerzhayard.forgewrapper.installer;
 
 import java.io.File;
-import java.net.URISyntaxException;
 import java.util.function.Predicate;
 
-import cpw.mods.modlauncher.Launcher;
 import net.minecraftforge.installer.actions.ActionCanceledException;
 import net.minecraftforge.installer.actions.ClientInstall;
 import net.minecraftforge.installer.actions.ProgressCallback;
@@ -17,15 +15,7 @@ public class ClientInstall4MultiMC extends ClientInstall {
 
     @Override
     public boolean run(File target, Predicate<String> optionals) {
-        File librariesDir;
+        File librariesDir = Main.getLibrariesDir();
-        try {
-            File laucnher = new File(Launcher.class.getProtectionDomain().getCodeSource().getLocation().toURI());
-            // see https://github.com/MinecraftForge/MinecraftForge/blob/863ab2ca184cf2e2dfa134d07bfc20d6a9a6a4e8/src/main/java/net/minecraftforge/fml/relauncher/libraries/LibraryManager.java#L151
-            //                     /<version>      /modlauncher    /mods           /cpw            /libraries
-            librariesDir = laucnher.getParentFile().getParentFile().getParentFile().getParentFile().getParentFile();
-        } catch (URISyntaxException e) {
-            throw new RuntimeException(e);
-        }
         File clientTarget = new File(String.format("%s/com/mojang/minecraft/%s/minecraft-%s-client.jar", librariesDir.getAbsolutePath(), this.profile.getMinecraft(), this.profile.getMinecraft()));
 
         boolean downloadLibraries = true; // Force true when without an internet connection.

src/main/java/io/github/zekerzhayard/forgewrapper/installer/Main.java

@@ -1,8 +1,11 @@
 package io.github.zekerzhayard.forgewrapper.installer;
 
 import java.io.File;
+import java.net.URISyntaxException;
 import java.net.URL;
 import java.net.URLClassLoader;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.List;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -14,21 +17,38 @@ public class Main {
     public static void main(String[] args) throws Exception {
         List<String> argsList = Stream.of(args).collect(Collectors.toList());
         String version = argsList.get(argsList.indexOf("--fml.mcVersion") + 1) + "-" + argsList.get(argsList.indexOf("--fml.forgeVersion") + 1);
-        String installerUrl = String.format("https://files.minecraftforge.net/maven/net/minecraftforge/forge/%s/forge-%s-installer.jar", version, version);
-        String installerFileStr = String.format("./.forgewrapper/forge-%s-installer.jar", version);
-        Utils.download(installerUrl, installerFileStr);
 
-        URLClassLoader ucl = URLClassLoader.newInstance(new URL[] {
+        Path forgeDir = getLibrariesDir().toPath().resolve("net").resolve("minecraftforge").resolve("forge").resolve(version);
-            Main.class.getProtectionDomain().getCodeSource().getLocation(),
+        Path clientJar = forgeDir.resolve("forge-" + version + "-client.jar");
-            Launcher.class.getProtectionDomain().getCodeSource().getLocation(),
+        Path extraJar = forgeDir.resolve("forge-" + version + "-extra.jar");
-            new File(installerFileStr).toURI().toURL()
+        if (Files.exists(clientJar) && Files.exists(extraJar)) {
-        }, null);
+            String installerUrl = String.format("https://files.minecraftforge.net/maven/net/minecraftforge/forge/%s/forge-%s-installer.jar", version, version);
+            String installerFileStr = String.format("./.forgewrapper/forge-%s-installer.jar", version);
+            Utils.download(installerUrl, installerFileStr);
 
-        Class<?> installer = ucl.loadClass("io.github.zekerzhayard.forgewrapper.installer.Installer");
+            URLClassLoader ucl = URLClassLoader.newInstance(new URL[] {
-        if (!(boolean) installer.getMethod("install").invoke(null)) {
+                Main.class.getProtectionDomain().getCodeSource().getLocation(),
-            return;
+                Launcher.class.getProtectionDomain().getCodeSource().getLocation(),
+                new File(installerFileStr).toURI().toURL()
+            }, null);
+
+            Class<?> installer = ucl.loadClass("io.github.zekerzhayard.forgewrapper.installer.Installer");
+            if (!(boolean) installer.getMethod("install").invoke(null)) {
+                return;
+            }
         }
 
         Launcher.main(args);
     }
+
+    public static File getLibrariesDir() {
+        try {
+            File laucnher = new File(Launcher.class.getProtectionDomain().getCodeSource().getLocation().toURI());
+            // see https://github.com/MinecraftForge/MinecraftForge/blob/863ab2ca184cf2e2dfa134d07bfc20d6a9a6a4e8/src/main/java/net/minecraftforge/fml/relauncher/libraries/LibraryManager.java#L151
+            //              /<version>      /modlauncher    /mods           /cpw            /libraries
+            return laucnher.getParentFile().getParentFile().getParentFile().getParentFile().getParentFile();
+        } catch (URISyntaxException e) {
+            throw new RuntimeException(e);
+        }
+    }
 }

src/main/java/why/does/multimc/target/Me.java

@@ -1,9 +0,0 @@
-package why.does.multimc.target;
-
-import io.github.zekerzhayard.forgewrapper.installer.Main;
-
-public class Me {
-    public static void main(String[] args) throws Exception {
-        Main.main(args);
-    }
-}

src/main/resources/patches/net.minecraftforge.json

@@ -1,6 +1,6 @@
 {
   "formatVersion": 1,
-  "mainClass": "why.does.multimc.target.Me",
+  "mainClass": "io.github.zekerzhayard.forgewrapper.installer.Main",
   "minecraftArguments": "",
   "name": "Forge",
   "requires": [
@@ -14,7 +14,7 @@
   "version": "{FORGE_VERSION}",
   "libraries": [
     {
-      "name": "io.github.zekerzhayard:ForgeWrapper:${version}",
+      "name": "io.github.zekerzhayard:Forge-Wrapper:${version}",
       "MMC-hint": "local",
       "MMC-filename": "ForgeWrapper-${version}.jar"
     }