Add sort support, can use every field

cmd/list.go

@@ -357,6 +357,50 @@ func ListJails(args []string, display bool) {
 		jails = js
 	}
 
+	/************************************************************************************
+	/   Sort jails
+	/     We support 3 sort criteria max
+	/***********************************************************************************/
+	if len(gSortFields) > 0 {
+		js := initSortStruct()
+
+		// The way we manage criteria quantity is not very elegant...
+		var fct1, fct2, fct3 reflect.Value
+		for i, c := range strings.Split(gSortFields, ",") {
+			var fctName string
+			if strings.HasPrefix(c, "-") {
+				fctName = fmt.Sprintf("%sDec", strings.Replace(c, "-", "", 1))
+			} else {	// Par defaut (pas de prefix +/-) on considere un tri incremental	
+				fctName = fmt.Sprintf("%sInc", strings.Replace(c, "+", "", 1))
+			}
+			
+			// Get function by its name
+			fct, _, err := getStructFieldValue(js, fctName)
+			if err != nil {
+				fieldName := strings.Replace(strings.Replace(c, "-", "", 1), "+", "", 1)
+				fmt.Printf("ERROR getting JailSort struct field %s. Please check the field name: %s\n", fctName, fieldName)
+				return
+			}
+			switch i+1 {
+				case 1:	fct1 = fct
+				case 2: fct2 = fct
+				case 3: fct3 = fct
+			}
+		}
+
+		switch len(strings.Split(gSortFields, ",")) {
+			case 1:
+				OrderedBy(fct1.Interface().(lessFunc)).Sort(jails)
+			case 2:
+				OrderedBy(fct1.Interface().(lessFunc), fct2.Interface().(lessFunc)).Sort(jails)
+			case 3:
+				OrderedBy(fct1.Interface().(lessFunc), fct2.Interface().(lessFunc), fct3.Interface().(lessFunc)).Sort(jails)
+		}
+	}
+
+	/************************************************************************************
+	/   Finally, display jails
+	/***********************************************************************************/
 	if display {
 		displayStructFields(jails, fields)
 	}