add support for config file and multiple clusters config (#1)

cmd/root.go

@@ -37,10 +37,7 @@ func Finish(err error) int {
 }
 
 func Main() int {
-	conf, err := cfg.Init()
-	if err != nil {
-		return Finish(err)
-	}
+	conf := cfg.NewConfig()
 
 	cmd := &cli.Command{
 		Name:                  "esctl",
@@ -57,6 +54,21 @@ func Main() int {
 				Sources:     cli.EnvVars("ES_DEBUG"),
 				Destination: &conf.Debug,
 			},
+			&cli.StringFlag{
+				Name:        "config",
+				Aliases:     []string{"c"},
+				Value:       "",
+				Usage:       "config file",
+				Sources:     cli.EnvVars("ES_CONFIG"),
+				Destination: &conf.ConfigFile,
+			},
+			&cli.StringFlag{
+				Name:        "cluster",
+				Aliases:     []string{"C"},
+				Value:       "",
+				Usage:       "cluster alias to work with",
+				Destination: &conf.CurrentCluster,
+			},
 		},
 
 		Commands: []*cli.Command{
@@ -67,7 +79,12 @@ func Main() int {
 		},
 
 		Before: func(ctx context.Context, cmd *cli.Command) (context.Context, error) {
+			if err := conf.Init(); err != nil {
+				Finish(err)
+			}
+
 			log.Init(conf)
+
 			return nil, nil
 		},
 	}