Refactor output code, add JSON, TSV and YAML output modes, add -o (#19), add version subcommand

cmd/root.go

@@ -40,9 +40,9 @@ func Main() int {
 	conf := cfg.NewConfig()
 
 	cmd := &cli.Command{
-		Name:                  "esctl",
-		Usage:                 "manage elasticsearch from cli",
-		Version:               cfg.Version,
+		Name:  "esctl",
+		Usage: "manage elasticsearch from cli",
+		//Version:               cfg.Version,
 		EnableShellCompletion: true,
 
 		Flags: []cli.Flag{
@@ -69,6 +69,13 @@ func Main() int {
 				Usage:       "cluster alias to work with",
 				Destination: &conf.CurrentCluster,
 			},
+			&cli.StringFlag{
+				Name:        "output",
+				Aliases:     []string{"o"},
+				Value:       "",
+				Usage:       "output mode (tsv, markdown, json, yaml) default: tsv",
+				Destination: &conf.Output,
+			},
 		},
 
 		Commands: []*cli.Command{
@@ -81,6 +88,7 @@ func Main() int {
 			Node(conf),
 			Doc(conf),
 			Repl(conf),
+			Version(conf),
 		},
 
 		Before: func(ctx context.Context, cmd *cli.Command) (context.Context, error) {
@@ -101,3 +109,16 @@ func Main() int {
 
 	return Finish(cmd.Run(context.Background(), os.Args))
 }
+
+func Version(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:  "version",
+		Usage: "show esctl version information",
+
+		Action: func(ctx context.Context, cmd *cli.Command) error {
+			_, err := fmt.Printf("esctl version: %s\n  build: %s\n  branch: %s\n  commit: %s\n  go version: %s\n  API Version: %s\n",
+				cfg.Version, cfg.BUILD, cfg.BRANCH, cfg.COMMIT, cfg.GOVERSION, cfg.APIVERSION)
+			return err
+		},
+	}
+}