LanguageFallbackValidator.cs

[Validator("Language Fallback Invalid", Status.Error, Description = "Validates all fields support language fallback. Add new properties to ignore templates that start with a particular path.")]
    public class LanguageFallbackValidator : UserConfigurableValidator
    {
        private static readonly Guid Template = new Guid("{AB86861A-6030-46C5-B394-E8F99E8B87DB}");

        public override IEnumerable<Problem> Validate(Dictionary<Guid, SitecoreDeployInfo> projectItems, XDocument scprojDocument)
        {
            var list = new List<Problem>();
            foreach (var projectItem in projectItems)
            {
                if (Settings.Properties.Where(i => !string.IsNullOrWhiteSpace(i)).Any(i => projectItem.Value.Item.SitecoreItemPath.StartsWith(i, StringComparison.InvariantCultureIgnoreCase)))
                    continue;

                var str = projectItem.Value.ParsedItem.Properties["template"];
                if (string.IsNullOrEmpty(str))
                    continue;

                var guid = new Guid(str);
                if (guid == Template)
                {
                    list.AddRange(ValidateTemplate(projectItems, projectItem.Value.Item));
                }
            }
            list.RemoveAll(r => r == null);
            return list;
        }

        private IEnumerable<Problem> ValidateTemplate(Dictionary<Guid, SitecoreDeployInfo> projectItems, SitecoreItem sitecoreItem)
        {
            if (!sitecoreItem.Children.Any())
            {
                var noChild = new Problem(this, $"{sitecoreItem.SitecoreItemPath} has no children.");
                yield return noChild;
                yield break;
            }

            var standardValue = sitecoreItem.Children.Values.FirstOrDefault(i => projectItems[i.ItemId].ParsedItem.Name == "__Standard Values");

            if (standardValue == null)
            {
                var noStandardValues = new Problem(this, $"{sitecoreItem.SitecoreItemPath} has no '__Standard Values' item.");
                yield return noStandardValues;
                yield break;
            }

            var standardValueItem = projectItems[standardValue.ItemId];

            var languageFallback = standardValueItem.ParsedItem.Fields["__Enable item fallback"];

            if (languageFallback != null && languageFallback == "1")
                yield break;

            var noLanguageFallback = new Problem(this, $"{sitecoreItem.SitecoreItemPath} does not have 'Enable Item Fallback' checked.");
            yield return noLanguageFallback;
        }

        public override ValidatorSettings GetDefaultSettings()
        {
            //Return a default list of locations to check
            return new ValidatorSettings
            {
                Properties = new List<string> { "" }
            };
        }
    }