Merge branch 'compact-format-flag' into master

PR #29

* compact-format-flag:
  Add --compact, -c bool flag to omit nonessential whitespace

Author: jamesls

jp.go

@@ -20,6 +20,10 @@ func main() {
 	app.Author = ""
 	app.Email = ""
 	app.Flags = []cli.Flag{
+		cli.BoolFlag{
+			Name:   "compact, c",
+			Usage:  "Produce compact JSON output that omits nonessential whitespace.",
+		},
 		cli.StringFlag{
 			Name:  "filename, f",
 			Usage: "Read input JSON from a file instead of stdin.",
@@ -111,7 +115,12 @@ func runMain(c *cli.Context) int {
 	if c.Bool("unquoted") && isString {
 		os.Stdout.WriteString(converted)
 	} else {
-		toJSON, err := json.MarshalIndent(result, "", "  ")
+		var toJSON []byte
+		if c.Bool("compact") {
+			toJSON, err = json.Marshal(result)
+		} else {
+			toJSON, err = json.MarshalIndent(result, "", "  ")
+		}
 		if err != nil {
 			errMsg("Error marshalling result to JSON: %s\n", err)
 			return 3