add "cluster ls", put "status" into "cluster status" (#5)

cmd/cluster.go

@@ -34,6 +34,49 @@ func Cluster(conf *cfg.Config) *cli.Command {
 
 		Commands: []*cli.Command{
 			Compare(conf),
+			Status(conf),
+			List(conf),
+		},
+	}
+}
+
+func List(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:    "list",
+		Usage:   "list configured clusters",
+		Aliases: []string{"ls"},
+
+		Action: func(ctx context.Context, cmd *cli.Command) error {
+			if err := es.List(conf); err != nil {
+				return err
+			}
+
+			return nil
+		},
+	}
+}
+
+func Status(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:    "status",
+		Usage:   "show cluster status",
+		Aliases: []string{"s"},
+
+		Flags: []cli.Flag{
+			&cli.BoolFlag{
+				Name:        "all",
+				Usage:       "show status of all clusters",
+				Destination: &conf.All,
+				Aliases:     []string{"a"},
+			},
+		},
+
+		Action: func(ctx context.Context, cmd *cli.Command) error {
+			if err := es.Status(conf); err != nil {
+				return err
+			}
+
+			return nil
 		},
 	}
 }