fix coredump, register default cluster name

cmd/cluster.go

@@ -194,6 +194,12 @@ func ClusterSettingsSet(conf *cfg.Config) *cli.Command {
 		},
 
 		Action: func(ctx context.Context, cmd *cli.Command) error {
+			args := cmd.Args()
+
+			if args.Len() == 0 {
+				return errors.New("at least one setting must be specified (format: setting:value)")
+			}
+
 			if err := es.ClusterSettingsSet(conf, cmd.Args()); err != nil {
 				return err
 			}

pkg/cfg/config.go

@@ -24,7 +24,6 @@ import (
 	"net/http"
 	"os"
 
-	"github.com/alecthomas/repr"
 	"github.com/elastic/elastic-transport-go/v8/elastictransport"
 	"github.com/elastic/go-elasticsearch/v9"
 	"gopkg.in/yaml.v3"
@@ -90,11 +89,12 @@ func (conf *Config) Init() error {
 		}
 	} else {
 		if len(conf.Clusters) == 1 {
-			for _, cluster := range conf.Clusters {
+			for name, cluster := range conf.Clusters {
 				conf.DefaultCluster = cluster
+				conf.CurrentCluster = name
 			}
 		} else {
-			for _, cluster := range conf.Clusters {
+			for name, cluster := range conf.Clusters {
 				_, err := cluster.ES.Cluster.Health().
 					Header("content-type", "application/json").
 					Header("accept", "application/json").
@@ -102,14 +102,15 @@ func (conf *Config) Init() error {
 
 				if err == nil {
 					conf.DefaultCluster = cluster
+					conf.CurrentCluster = name
 				}
 			}
 		}
 	}
 
-	if conf.Debug {
-		repr.Println(conf)
-	}
+	// if conf.Debug {
+	// 	repr.Println(conf)
+	// }
 
 	return nil
 }