added logging config

fclauncher/InstanceManager.go

@@ -169,6 +169,7 @@ func (i *InstanceManager)InstallVanilla(version string, instanceName string) {
 		fmt.Printf("Libs Downloaded")
 	}
 	InstallNatives(version, filepath.Join(dir, "FCLauncher", "instances", instanceName, "minecraft", "natives"))
+	DownloadLoggingConfig(version, filepath.Join(dir, "FCLauncher", "instances", instanceName, "minecraft"))
 	err = DownloadExecutable(version, filepath.Join(dir, "FCLauncher", "bin"), *i.app)
 	if err != nil {
 		fmt.Printf("Unable to download binaries: %s\n", err)

fclauncher/minecraft.go

@@ -93,6 +93,15 @@ type McDownload struct {
 	Url string
 }
 
+type McLogging struct {
+	Client McLoggingClient
+}
+
+type McLoggingClient struct {
+	Argument string
+	File McDownload
+}
+
 type McMetadata struct {
 	Arguments McArguments
 	AssetIndex McAssetIndex
@@ -102,13 +111,13 @@ type McMetadata struct {
 	Id string
 	JavaVersion	McJavaVersion
 	Libraries []McLibrary
-	Logging interface{}
 	MainClass string
 	MinimumLauncherVersion int
 	ReleaseTime time.Time
 	Time time.Time
 	Type string
 	MinecraftArguments string
+	Logging McLogging
 }
 
 func GetVersionManifest() (McVersionManifest, error) {
@@ -437,6 +446,19 @@ func InstallNatives(mcVersion string, nativesDir string){
 	}
 }
 
+func DownloadLoggingConfig(mcVersion string, gameDir string){
+	metadata, _ := GetVersionMetadata(mcVersion)
+	resp, err := http.Get(metadata.Logging.Client.File.Url)
+	if err != nil {
+		fmt.Printf("Error downloading logging config: %s\n", err)
+	}
+	defer resp.Body.Close()
+	os.MkdirAll(gameDir, 0755)
+	f, _ := os.OpenFile(filepath.Join(gameDir, "log4j2.xml"), os.O_CREATE|os.O_RDWR, 0755)
+	defer f.Close()
+	io.Copy(f, resp.Body)
+}
+
 func DownloadExecutable(mcVersion string, binDir string, a App) error {
 	metadata, err := GetVersionMetadata(mcVersion)
 	if err != nil {
@@ -512,6 +534,7 @@ func GetBaseLaunchArgs(mcVersion string, libDir string, binDir string, assetDir
 	args = append(args, "-Djna.tmpdir="+filepath.Join(gameDir, "natives"))
 	args = append(args, "-Dorg.lwjgl.system.SharedLibraryExtractpath="+filepath.Join(gameDir, "natives"))
 	args = append(args, "-Dio.netty.native.workdir="+filepath.Join(gameDir, "natives"))
+	args = append(args, strings.ReplaceAll(metadata.Logging.Client.Argument, "${path}", filepath.Join(gameDir, "log4j2.xml")))
 	args = append(args, "-Xms512m")
 	args = append(args, "-Xmx1024m")
 	args = append(args, "-cp")