Indexer searching for special episodes using query string

Added SpecialEpisodeSearchCriteria criteria to handle special episode search queries
Added method NzbSearchService.SearchSpecial() for season0 episodes
Added IIndexer GetSearchUrls() for doing text based queries

src/NzbDrone.Core/IndexerSearch/Definitions/SearchCriteriaBase.cs

@@ -23,7 +23,7 @@ namespace NzbDrone.Core.IndexerSearch.Definitions
             }
         }
 
-        private static string GetQueryTitle(string title)
+        public static string GetQueryTitle(string title)
         {
             Ensure.That(title,() => title).IsNotNullOrWhiteSpace();
 

src/NzbDrone.Core/IndexerSearch/Definitions/SpecialEpisodeSearchCriteria.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace NzbDrone.Core.IndexerSearch.Definitions
+{
+    public class SpecialEpisodeSearchCriteria : SearchCriteriaBase
+    {
+        public string[] EpisodeQueryTitles { get; set; }
+
+        public override string ToString()
+        {
+            var sb = new StringBuilder();
+            bool delimiter = false;
+            foreach (var title in EpisodeQueryTitles)
+            {
+                if (delimiter)
+                {
+                    sb.Append(',');
+                }
+                sb.Append(title);
+                delimiter = true;
+            }
+            return string.Format("[{0} : {1}]", SceneTitle, sb.ToString());
+        }
+    }
+}

src/NzbDrone.Core/IndexerSearch/NzbSearchService.cs

@@ -64,6 +64,12 @@ namespace NzbDrone.Core.IndexerSearch
                 return SearchDaily(series, episode);
             }
 
+            if (episode.SeasonNumber == 0)
+            {
+                // search for special episodes in season 0 
+                return SearchSpecial(series, new List<Episode>{episode});
+            }
+
             return SearchSingle(series, episode);
         }
 
@@ -103,11 +109,28 @@ namespace NzbDrone.Core.IndexerSearch
             return Dispatch(indexer => _feedFetcher.Fetch(indexer, searchSpec), searchSpec);
         }
 
+        private List<DownloadDecision> SearchSpecial(Series series, List<Episode> episodes)
+        {
+            var searchSpec = Get<SpecialEpisodeSearchCriteria>(series, episodes);
+            // build list of queries for each episode in the form: "<series> <episode-title>"
+            searchSpec.EpisodeQueryTitles = episodes.Where(e => !String.IsNullOrWhiteSpace(e.Title))
+                                                    .Select(e => searchSpec.QueryTitle + "+" + SearchCriteriaBase.GetQueryTitle(e.Title))
+                                                    .ToArray();
+
+            return Dispatch(indexer => _feedFetcher.Fetch(indexer, searchSpec), searchSpec);
+        }
+
         public List<DownloadDecision> SeasonSearch(int seriesId, int seasonNumber)
         {
             var series = _seriesService.GetSeries(seriesId);
             var episodes = _episodeService.GetEpisodesBySeason(seriesId, seasonNumber);
 
+            if (seasonNumber == 0)
+            {
+                // search for special episodes in season 0 
+                return SearchSpecial(series, episodes);
+            }
+
             var searchSpec = Get<SeasonSearchCriteria>(series, episodes);
             searchSpec.SeasonNumber = seasonNumber;