New: Better interface for creating custom formats

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

@@ -0,0 +1,20 @@
+using NzbDrone.Core.Annotations;
+using NzbDrone.Core.Parser.Model;
+using NzbDrone.Core.Qualities;
+
+namespace NzbDrone.Core.CustomFormats
+{
+    public class SourceSpecification : CustomFormatSpecificationBase
+    {
+        public override int Order => 5;
+        public override string ImplementationName => "Source";
+
+        [FieldDefinition(1, Label = "Source", Type = FieldType.Select, SelectOptions = typeof(Source))]
+        public int Value { get; set; }
+
+        protected override bool IsSatisfiedByWithoutNegate(ParsedMovieInfo movieInfo)
+        {
+            return (movieInfo?.Quality?.Quality?.Source ?? (int)Source.UNKNOWN) == (Source)Value;
+        }
+    }
+}