Sort of run node app

master/main.go

@@ -27,7 +27,7 @@ func main() {
 
 	go watchFiles(watchedDir, fileChanges)
 
-	go printChanges(fileChanges)
+	go runExpress(fileChanges)
 
 	// WaitGroup to track both processes
 	// var wg sync.WaitGroup

master/printchanges.go

@@ -1,11 +0,0 @@
-package main
-
-import (
-	"fmt"
-)
-
-func printChanges(changes <-chan FileChange) {
-	for change := range changes {
-		fmt.Printf("[%s] %s\n", change.Operation, change.Path)
-	}
-}

master/runexpress.go

@@ -0,0 +1,124 @@
+package main
+
+import (
+	"io"
+	"log"
+	"os"
+	"os/exec"
+	"sync"
+	"syscall"
+	"time"
+)
+
+func runExpress(changes <-chan FileChange) {
+	var currentProcess *exec.Cmd
+	var mu sync.Mutex
+
+	// Helper to start the express process
+	startExpress := func() *exec.Cmd {
+		cmd := exec.Command("node", "../express/dist/index.js")
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+
+		if err := cmd.Start(); err != nil {
+			log.Printf("[express] Failed to start: %v", err)
+			return nil
+		}
+
+		log.Printf("[express] Started (pid %d)", cmd.Process.Pid)
+
+		// Monitor the process in background
+		go func() {
+			err := cmd.Wait()
+			if err != nil {
+				log.Printf("[express] Process exited: %v", err)
+			} else {
+				log.Printf("[express] Process exited normally")
+			}
+		}()
+
+		return cmd
+	}
+
+	// Helper to stop the express process
+	stopExpress := func(cmd *exec.Cmd) {
+		if cmd == nil || cmd.Process == nil {
+			return
+		}
+
+		log.Printf("[express] Stopping (pid %d)", cmd.Process.Pid)
+		cmd.Process.Signal(syscall.SIGTERM)
+
+		// Wait briefly for graceful shutdown
+		done := make(chan struct{})
+		go func() {
+			cmd.Wait()
+			close(done)
+		}()
+
+		select {
+		case <-done:
+			log.Printf("[express] Stopped gracefully")
+		case <-time.After(5 * time.Second):
+			log.Printf("[express] Force killing")
+			cmd.Process.Kill()
+		}
+	}
+
+	// Helper to run the build
+	runBuild := func() bool {
+		log.Printf("[build] Starting ncc build...")
+
+		cmd := exec.Command("sh", "-c", "cd ../express && ../cmd pnpm ncc build ./app.ts")
+
+		stdout, _ := cmd.StdoutPipe()
+		stderr, _ := cmd.StderrPipe()
+
+		if err := cmd.Start(); err != nil {
+			log.Printf("[build] Failed to start: %v", err)
+			return false
+		}
+
+		// Copy output
+		go io.Copy(os.Stdout, stdout)
+		go io.Copy(os.Stderr, stderr)
+
+		err := cmd.Wait()
+		if err != nil {
+			log.Printf("[build] Failed: %v", err)
+			return false
+		}
+
+		log.Printf("[build] Success")
+		return true
+	}
+
+	// Debounce timer
+	var debounceTimer *time.Timer
+	const debounceDelay = 100 * time.Millisecond
+
+	for change := range changes {
+		log.Printf("[watch] %s: %s", change.Operation, change.Path)
+
+		// Reset debounce timer
+		if debounceTimer != nil {
+			debounceTimer.Stop()
+		}
+
+		debounceTimer = time.AfterFunc(debounceDelay, func() {
+			if !runBuild() {
+				log.Printf("[master] Build failed, keeping current process")
+				return
+			}
+
+			mu.Lock()
+			defer mu.Unlock()
+
+			// Stop old process
+			stopExpress(currentProcess)
+
+			// Start new process
+			currentProcess = startExpress()
+		})
+	}
+}