Fix GUI instance counts and launcher tmp paths

cmd/vrc_osc/main.go

@@ -4,18 +4,39 @@ import (
 	"flag"
 	"log"
 	"os"
+	"os/exec"
+	"path/filepath"
 
 	"vrc_osc_go/internal/app"
 )
 
 func main() {
 	var configPath string
+	var mode string
+	var noGUI bool
 	flag.StringVar(&configPath, "config", "config/config.toml", "path to config.toml")
+	flag.StringVar(&mode, "mode", "", "generate-json or extract-log")
+	flag.BoolVar(&noGUI, "no-gui", false, "do not launch the GUI companion")
 	flag.Parse()
 
-	if err := app.Run(configPath); err != nil {
+	if mode == "" && !noGUI {
+		launchGUI()
+	}
+
+	if err := app.Run(configPath, mode); err != nil {
 		log.SetOutput(os.Stderr)
 		log.Fatalf("vrc_osc_go: %v", err)
 	}
 }
 
+func launchGUI() {
+	exe, err := os.Executable()
+	if err != nil {
+		return
+	}
+	gui := filepath.Join(filepath.Dir(exe), "vrc_osc_gui.exe")
+	if _, err := os.Stat(gui); err != nil {
+		return
+	}
+	_ = exec.Command(gui).Start()
+}