New: Added Advanced option to Nyaa to change query parameters for category and filter.

src/NzbDrone.Core/Indexers/Nyaa/NyaaRequestGenerator.cs

@@ -84,7 +84,7 @@ namespace NzbDrone.Core.Indexers.Nyaa
 
         private IEnumerable<IndexerRequest> GetPagedRequests(Int32 maxPages, String searchParameters)
         {
-            var baseUrl = String.Format("{0}/?page=rss&cats=1_37&filter=1", Settings.BaseUrl.TrimEnd('/'));
+            var baseUrl = String.Format("{0}/?page=rss{1}", Settings.BaseUrl.TrimEnd('/'), Settings.AdditionalParameters);
 
             if (PageSize == 0)
             {

src/NzbDrone.Core/Indexers/Nyaa/NyaaSettings.cs

@@ -3,7 +3,7 @@ using FluentValidation;
 using NzbDrone.Core.Annotations;
 using NzbDrone.Core.ThingiProvider;
 using NzbDrone.Core.Validation;
-
+using System.Text.RegularExpressions;
 namespace NzbDrone.Core.Indexers.Nyaa
 {
     public class NyaaSettingsValidator : AbstractValidator<NyaaSettings>
@@ -11,6 +11,7 @@ namespace NzbDrone.Core.Indexers.Nyaa
         public NyaaSettingsValidator()
         {
             RuleFor(c => c.BaseUrl).ValidRootUrl();
+            RuleFor(c => c.AdditionalParameters).Matches("(&[a-z]+=[a-z0-9_]+)*", RegexOptions.IgnoreCase);
         }
     }
 
@@ -21,11 +22,15 @@ namespace NzbDrone.Core.Indexers.Nyaa
         public NyaaSettings()
         {
             BaseUrl = "http://www.nyaa.se";
+            AdditionalParameters = "&cats=1_37&filter=1";
         }
 
         [FieldDefinition(0, Label = "Website URL")]
         public String BaseUrl { get; set; }
 
+        [FieldDefinition(1, Label = "Additional Parameters", Advanced = true, HelpText = "Please note if you change the category you will have to add required/restricted rules about the subgroups to avoid foreign language releases.")]
+        public String AdditionalParameters { get; set; }
+
         public NzbDroneValidationResult Validate()
         {
             return new NzbDroneValidationResult(Validator.Validate(this));