New: Better interface for creating custom formats

src/NzbDrone.Core/CustomFormats/Specifications/LanguageSpecification.cs

@@ -0,0 +1,20 @@
+using NzbDrone.Core.Annotations;
+using NzbDrone.Core.Languages;
+using NzbDrone.Core.Parser.Model;
+
+namespace NzbDrone.Core.CustomFormats
+{
+    public class LanguageSpecification : CustomFormatSpecificationBase
+    {
+        public override int Order => 3;
+        public override string ImplementationName => "Language";
+
+        [FieldDefinition(1, Label = "Language", Type = FieldType.Select, SelectOptions = typeof(LanguageFieldConverter))]
+        public int Value { get; set; }
+
+        protected override bool IsSatisfiedByWithoutNegate(ParsedMovieInfo movieInfo)
+        {
+            return movieInfo?.Languages?.Contains((Language)Value) ?? false;
+        }
+    }
+}