From dfc1b5471353192a9b7706662999873c64ffb4b2 Mon Sep 17 00:00:00 2001
From: Hippolyte <leo.lavaur@gmail.com>
Date: Mon, 18 Feb 2019 13:48:40 +0100
Subject: [PATCH] Add NotEmpty validator for string fields

---
 declarative/validators.go |  7 +++++++
 validators.go             | 18 ++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/declarative/validators.go b/declarative/validators.go
index 7f6e8e66..89f2c0ab 100644
--- a/declarative/validators.go
+++ b/declarative/validators.go
@@ -42,6 +42,13 @@ func (SelRequired) Create() (walk.Validator, error) {
 	return walk.SelectionRequiredValidator(), nil
 }
 
+type NotEmpty struct {
+}
+
+func (NotEmpty) Create() (walk.Validator, error) {
+	return walk.NotEmptyValidator(), nil
+}
+
 type dMultiValidator struct {
 	validators []Validator
 }
diff --git a/validators.go b/validators.go
index 2f256f1c..65fc1260 100644
--- a/validators.go
+++ b/validators.go
@@ -150,3 +150,21 @@ func (selectionRequiredValidator) Validate(v interface{}) error {
 
 	return nil
 }
+
+type notEmptyValidator struct {
+}
+
+var notEmptyValidatorSingleton Validator = notEmptyValidator{}
+
+func NotEmptyValidator() Validator {
+	return notEmptyValidatorSingleton
+}
+
+func (notEmptyValidator) Validate(v interface{}) error {
+	if s := v.(string); len(s) <= 0 {
+		return NewValidationError(
+			tr("Empty field", "walk"),
+			tr("Please fill out the required fields.", "walk"))
+	}
+	return nil
+}