ListJailsProps() : Replace unused args with format

cmd/list.go

@@ -15,24 +15,38 @@ import (
  * List all properties a jail have, with their internal name
  * Only print properties name. To get name & values, use GetJailProperties()
  *******************************************************************************/
-func ListJailsProps(args []string) {
+func ListJailsProps(format string) (string, error) {
 	var conf Jail
-	var result []string
+	var props []string
+	var out string
 	// Mandatory constructor to init default values
 	jailconf, err := NewJailConfig()
 	if err != nil {
 		fmt.Printf("Error allocating JailConfig: %s\n", err.Error())
-		return
+		return out, err
 	}
 
 	conf.Config = jailconf
 
-	result = getStructFieldNames(conf, result, "")
+	props = getStructFieldNames(conf, props, "")
 
-	for _, f := range result {
+	if format == "json" {
-		fmt.Printf("%s\n", f)
+		out = "{\"properties\":["
+		for i, p := range props {
+			out += fmt.Sprintf("\"%s\"", p)
+			if i < len(props) - 1 {
+				out += ","
 			}
 		}
+		out += "]}"
+	} else {
+		for _, p := range props {
+			out += fmt.Sprintf("%s\n", p)
+		}
+	}
+
+	return out, nil
+}
 
 /********************************************************************************
  * Get Jails from datastores. Store config and running metadata