fix panic if using 'cluser ls -d' (#45)

pkg/cfg/config.go

@@ -26,6 +26,7 @@ import (
 	"log/slog"
 	"net/http"
 	"os"
+	"reflect"
 
 	"github.com/alecthomas/repr"
 	"github.com/elastic/elastic-transport-go/v8/elastictransport"
@@ -162,6 +163,7 @@ func (conf *Config) Init() error {
 				if err == nil {
 					conf.DefaultCluster = cluster
 					conf.CurrentCluster = name
+					break
 				}
 			}
 		}
@@ -174,17 +176,33 @@ func (conf *Config) Init() error {
 	return nil
 }
 
+// we are  using reflect to  clone a config obj  w/o the ES  stuff for
+// shorter repr.Println() output (the ES structure is just too large)
+func (conf *Config) Clone() Config {
+	clone := Config{}
+
+	ref := reflect.ValueOf(*conf)
+	typeOfS := ref.Type()
+
+	for i := 0; i < ref.NumField(); i++ {
+		field := typeOfS.Field(i).Name
+
+		if field == "Clusters" || field == "DefaultCluster" || !ref.Field(i).CanInterface() {
+			continue
+		}
+
+		reflect.ValueOf(&clone).Elem().FieldByName(field).Set(reflect.ValueOf(ref.Field(i).Interface()))
+	}
+
+	return clone
+}
+
 func (conf *Config) PrintDebug() {
 	if !conf.Debug {
 		return
 	}
 
-	clone := *conf
-
-	for name := range clone.Clusters {
-		clone.Clusters[name] = nil
-	}
-	clone.DefaultCluster = nil
+	clone := conf.Clone()
 
 	fmt.Println("config:")
 	repr.Println(clone)