Initial scaffold: project structure, .gitignore, go.mod

internal/tray/panel.go

@@ -0,0 +1,76 @@
+package tray
+
+import (
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"sync"
+)
+
+var (
+	panelMu   sync.Mutex
+	panelProc *os.Process
+)
+
+// launchPanel starts the syncwarden-panel subprocess if not already running.
+func launchPanel(baseURL string) {
+	panelMu.Lock()
+	defer panelMu.Unlock()
+
+	// Check if already running
+	if panelProc != nil {
+		// Check if process is still alive
+		if err := panelProc.Signal(os.Signal(nil)); err == nil {
+			log.Println("panel already running")
+			return
+		}
+		panelProc = nil
+	}
+
+	panelBin := panelBinaryPath()
+	if panelBin == "" {
+		log.Println("syncwarden-panel binary not found")
+		return
+	}
+
+	cmd := exec.Command(panelBin, "-addr", baseURL)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Start(); err != nil {
+		log.Printf("failed to start panel: %v", err)
+		return
+	}
+	panelProc = cmd.Process
+	log.Printf("panel started (pid %d)", cmd.Process.Pid)
+
+	// Wait for process to exit in background
+	go func() {
+		_ = cmd.Wait()
+		panelMu.Lock()
+		panelProc = nil
+		panelMu.Unlock()
+		log.Println("panel exited")
+	}()
+}
+
+// panelBinaryPath finds the syncwarden-panel binary next to the main binary.
+func panelBinaryPath() string {
+	exe, err := os.Executable()
+	if err != nil {
+		return ""
+	}
+	dir := filepath.Dir(exe)
+
+	name := "syncwarden-panel"
+	if runtime.GOOS == "windows" {
+		name = "syncwarden-panel.exe"
+	}
+
+	p := filepath.Join(dir, name)
+	if _, err := os.Stat(p); err == nil {
+		return p
+	}
+	return ""
+}