add saving cfg

config.go

@@ -13,6 +13,7 @@ import (
 
 	log "github.com/sirupsen/logrus"
 	"github.com/tailscale/hujson"
+	"github.com/tidwall/pretty"
 )
 
 type Config struct {
@@ -180,6 +181,37 @@ func LoadConfigByte(conf []byte) (*Config, error) {
 	return c, nil
 }
 
+// Save config
+func (c *Config) Save() error {
+	log.WithFields(log.Fields{}).Debugf("starting")
+	defer log.WithFields(log.Fields{}).Debugf("done")
+
+	cfgMx.Lock()
+	defer cfgMx.Unlock()
+
+	b, err := json.Marshal(cfg)
+	if err != nil {
+		log.WithFields(log.Fields{"error": err}).Errorf("")
+		return err
+	}
+
+	r := pretty.Pretty(b)
+
+	f, err := os.Open(*cfgFile)
+	if err != nil {
+		log.WithFields(log.Fields{"error": err}).Errorf("")
+		return err
+	}
+
+	if _, err := f.Write(r); err != nil {
+		log.WithFields(log.Fields{"error": err}).Errorf("")
+		return err
+	}
+
+	return nil
+
+}
+
 // Run config
 func (c *Config) Run() {
 	log.WithFields(log.Fields{}).Debugf("starting")