pub

internal/config/watcher.go

@@ -0,0 +1,55 @@
+package config
+
+import (
+	"log"
+	"path/filepath"
+
+	"github.com/fsnotify/fsnotify"
+)
+
+// WatchConfig watches the config file for changes and triggers the callback
+func WatchConfig(path string, onChange func(*Config)) error {
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		return err
+	}
+
+	absPath, err := filepath.Abs(path)
+	if err != nil {
+		return err
+	}
+	configDir := filepath.Dir(absPath)
+
+	go func() {
+		defer watcher.Close()
+		for {
+			select {
+			case event, ok := <-watcher.Events:
+				if !ok {
+					return
+				}
+				// Many editors trigger Write or Rename when saving
+				if event.Has(fsnotify.Write) || event.Has(fsnotify.Create) {
+					if filepath.Base(event.Name) == filepath.Base(absPath) {
+						log.Printf("Config file changed: %s", event.Name)
+						newCfg, err := LoadConfig(absPath)
+						if err != nil {
+							log.Printf("Failed to reload config: %v", err)
+							continue
+						}
+						onChange(newCfg)
+					}
+				}
+			case err, ok := <-watcher.Errors:
+				if !ok {
+					return
+				}
+				log.Printf("Watcher error: %v", err)
+			}
+		}
+	}()
+
+	// Watch the directory instead of the file to handle cases where 
+	// editors use atomic saves (create new file, delete old, rename new)
+	return watcher.Add(configDir)
+}