displayStructFields now recurse into nested structs

cmd/list.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"log"
 	"reflect"
+	"strings"
 	"io/ioutil"
 	"gocage/jail"
 	"encoding/json"
@@ -14,6 +15,46 @@ import (
 
 var gJails []Jail
 
+
+func getStructField(parentStruct interface{}, fieldName string) (reflect.Value, string) {
+	v := reflect.ValueOf(parentStruct)
+
+	if v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+
+	if false {
+		for i := 0 ; i < v.NumField(); i++ {
+			f := v.Field(i)
+			if f.Kind() == reflect.String {
+				fmt.Printf("%v=%v\n", v.Type().Field(i).Name, f.Interface())
+			}
+		}
+	}
+
+	if strings.Contains(fieldName, ".") {
+		fs := strings.Split(fieldName, ".")
+		f := v.FieldByName(fs[0])
+		if f.Kind() == reflect.Struct {
+			return getStructField(f.Interface(), strings.Join(fs[1:], "."))
+		} else {
+			log.Fatalln(fmt.Sprintf("%s is not a struct: %s\n", fs[0], f.Kind().String()))
+		}
+	}
+
+	if false {
+		if v.FieldByName(fieldName).IsValid() {
+			log.Println(fmt.Sprintf("%s value: %s", fieldName, v.FieldByName(fieldName).Interface()))
+		} else {
+			log.Println(fmt.Sprintf("%s is invalid", fieldName))
+		}
+	}
+
+	return v, fieldName
+}
+
+
+
 /* Pretty display of jails field
    Fields to show are given in a string array parameter
    Ex. : displayJails(["Name", "JID", "RootPath"])
@@ -46,14 +87,17 @@ func displayStructFields(jails []Jail, valsToDisplay []string) {
 		
 		line := make([]Field, len(valsToDisplay))
 		for i, f := range valsToDisplay {
-			a := reflect.ValueOf(&tj).Elem()
+			a, f := getStructField(tj, f)
+
 			field := Field {
 				Name: f,
 			}
-			if a.Elem().FieldByName(f).IsValid() {
+			if a.FieldByName(f).IsValid() {
 				// For now this just contains this item length, will adjust later
-				field.MaxLen = len(fmt.Sprintf("%v", a.Elem().FieldByName(f).Interface()))
-				field.Value = fmt.Sprintf("%v", a.Elem().FieldByName(f).Interface())
+				field.MaxLen = len(fmt.Sprintf("%v", a.FieldByName(f).Interface()))
+				field.Value = fmt.Sprintf("%v", a.FieldByName(f).Interface())
+			} else {
+				fmt.Printf("Invalid field name: %s\n", f)
 			}
 			line[i] = field
 			
@@ -145,7 +189,7 @@ func listJails(args []string) {
 		listJailsFromDatastore(d)
 	}
 
-	displayStructFields(gJails, []string{"JID", "Name", "Release", "RootPath"})
+	displayStructFields(gJails, []string{"JID", "Name", "Config.Release", "Config.Ip4_addr", "RootPath"})
 }