added pretty print

Author: rsdoiel

cmds/jsoncols/jsoncols.go

@@ -85,9 +85,15 @@ Would yield
 	delimiter      = ","
 	expressions    []string
 	quote          bool
+	pretty         bool
 )
 
 func main() {
+	var (
+		src []byte
+		err error
+	)
+
 	app := cli.NewCli(datatools.Version)
 	appName := app.AppName()
 
@@ -116,14 +122,13 @@ func main() {
 	app.BoolVar(&csvOutput, "csv", false, "output as CSV or other flat delimiter row")
 	app.StringVar(&delimiter, "d,delimiter", delimiter, "set the delimiter for multi-field csv output")
 	app.BoolVar(&quote, "quote", true, "quote strings and JSON notation")
+	app.BoolVar(&pretty, "p,pretty", false, "pretty print JSON output")
 
 	// Parse Environment and Options
 	app.Parse()
 	args := app.Args()
 
 	// Setup IO
-	var err error
-
 	app.Eout = os.Stderr
 	app.In, err = cli.Open(inputFName, os.Stdin)
 	cli.ExitOnError(app.Eout, err, quiet)
@@ -187,7 +192,11 @@ func main() {
 			case json.Number:
 				row = append(row, result.(json.Number).String())
 			default:
-				src, err := json.Marshal(result)
+				if pretty {
+					src, err = json.MarshalIndent(result, "", "    ")
+				} else {
+					src, err = json.Marshal(result)
+				}
 				cli.ExitOnError(app.Eout, err, quiet)
 				row = append(row, fmt.Sprintf("%s", src))
 			}
@@ -227,7 +236,11 @@ func main() {
 			case json.Number:
 				fmt.Fprintf(app.Out, "%s", result.(json.Number).String())
 			default:
-				src, err := json.Marshal(result)
+				if pretty {
+					src, err = json.MarshalIndent(result, "", "    ")
+				} else {
+					src, err = json.Marshal(result)
+				}
 				cli.ExitOnError(app.Eout, err, quiet)
 				/*
 					if quote == true {