support more multi-part grouping names (#2165)

CHANGELOG.md

@@ -95,6 +95,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
     - The FFmpeg report of the playback attempt
     - The media info for the content
     - The `Troubleshooting` > `General` output
+- Support `(Part [english number])` name suffixes for multi-part episode grouping, for example:
+  - `Awesome Episode (Part One)`
+  - `Better Episode (Part Two)`
+  - `Not So Great (Part Three)`
 
 ### Changed
 - Allow `Other Video` libraries and `Image` libraries to use the same folders

ErsatzTV.Core.Tests/Scheduling/MultiPartEpisodeGrouperTests.cs

@@ -12,6 +12,7 @@ public class MultiPartEpisodeGrouperTests
     [TestCase("Episode 1 - More", "Episode 2 (1) - Title", "Episode 3 (2) - After", "Episode 4 - Dash")]
     [TestCase("Episode 1", "Episode 2 Part 1", "Episode 3 Part 2", "Episode 4")]
     [TestCase("Episode 1", "Episode 2 (Part 1)", "Episode 3 (Part 2)", "Episode 4")]
+    [TestCase("Episode 1", "Episode 2 (Part One)", "Episode 3 (Part Two)", "Episode 4")]
     public void NotGrouped_Grouped_NotGrouped(string one, string two, string three, string four)
     {
         var mediaItems = new List<MediaItem>
@@ -35,7 +36,9 @@ public class MultiPartEpisodeGrouperTests
     [TestCase("Episode 1 Part 1", "Episode 2 (2) - More", "Episode 3 - After")]
     [TestCase("Episode 1 Part 1", "Episode 2 (II)", "Episode 3")]
     [TestCase("Episode 1 Part One", "Episode 2 (II)", "Episode 3")]
+    [TestCase("Episode 1 (Part One)", "Episode 2 (II)", "Episode 3")]
     [TestCase("Episode 1 (1)", "Episode 2 (Part 2)", "Episode 3")]
+
     public void MixedNaming_Group(string one, string two, string three)
     {
         var mediaItems = new List<MediaItem>
@@ -52,6 +55,24 @@ public class MultiPartEpisodeGrouperTests
         ShouldHaveOneItem(result, mediaItems[2]);
     }
 
+    [Test]
+    [TestCase("The Meddlers (Part One)", "The Meddlers (Part Two)", "The Meddlers (Part Three)")]
+    [TestCase("S01E01 The Slaves of Jedikiah, Part 1", "S01E02 The Slaves of Jedikiah, Part 2", "S01E03 The Slaves of Jedikiah, Part 3")]
+    public void All_Grouped(string one, string two, string three)
+    {
+        var mediaItems = new List<MediaItem>
+        {
+            NamedEpisode(one, 1, 1, 1),
+            NamedEpisode(two, 1, 1, 2),
+            NamedEpisode(three, 1, 1, 3)
+        };
+
+        List<GroupedMediaItem> result = MultiPartEpisodeGrouper.GroupMediaItems(mediaItems, false);
+
+        result.Count.ShouldBe(1);
+        ShouldHaveMultipleItems(result, mediaItems[0], [mediaItems[1], mediaItems[2]]);
+    }
+
     [Test]
     [TestCase("Episode 1 (5)", "Episode 2 - (6)", "Episode 3")]
     [TestCase("Episode 1 Part 5", "Episode 2 Part 6", "Episode 3 - After")]

ErsatzTV.Core/Scheduling/MultiPartEpisodeGrouper.cs

@@ -4,7 +4,7 @@ using LanguageExt.UnsafeValueAccess;
 
 namespace ErsatzTV.Core.Scheduling;
 
-public static class MultiPartEpisodeGrouper
+public static partial class MultiPartEpisodeGrouper
 {
     public static List<GroupedMediaItem> GroupMediaItems(IList<MediaItem> mediaItems, bool treatCollectionsAsShows)
     {
@@ -118,29 +118,25 @@ public static class MultiPartEpisodeGrouper
     {
         foreach (EpisodeMetadata metadata in e.EpisodeMetadata.HeadOrNone())
         {
-            const string PATTERN = @"^.*\((\d+)\)( - .*)?$";
+            Match match = Pattern1Regex().Match(metadata.Title ?? string.Empty);
-            Match match = Regex.Match(metadata.Title ?? string.Empty, PATTERN);
             if (match.Success && int.TryParse(match.Groups[1].Value, out int value1))
             {
                 return value1;
             }
 
-            const string PATTERN_2 = @"^.*\(?Part (\d+)\)?$";
+            Match match2 = Pattern2Regex().Match(metadata.Title ?? string.Empty);
-            Match match2 = Regex.Match(metadata.Title ?? string.Empty, PATTERN_2);
             if (match2.Success && int.TryParse(match2.Groups[1].Value, out int value2))
             {
                 return value2;
             }
 
-            const string PATTERN_3 = @"^.*\(([MDCLXVI]+)\)( - .*)?$";
+            Match match3 = Pattern3Regex().Match(metadata.Title ?? string.Empty);
-            Match match3 = Regex.Match(metadata.Title ?? string.Empty, PATTERN_3);
             if (match3.Success && TryParseRoman(match3.Groups[1].Value, out int value3))
             {
                 return value3;
             }
 
-            const string PATTERN_4 = @"^.*Part (\w+)$";
+            Match match4 = Pattern4Regex().Match(metadata.Title ?? string.Empty);
-            Match match4 = Regex.Match(metadata.Title ?? string.Empty, PATTERN_4);
             if (match4.Success && TryParseEnglish(match4.Groups[1].Value, out int value4))
             {
                 return value4;
@@ -229,4 +225,16 @@ public static class MultiPartEpisodeGrouper
                 return false;
         }
     }
+
+    [GeneratedRegex(@"^.*\((\d+)\)( - .*)?$")]
+    private static partial Regex Pattern1Regex();
+
+    [GeneratedRegex(@"^.*\(?Part (\d+)\)?$")]
+    private static partial Regex Pattern2Regex();
+
+    [GeneratedRegex(@"^.*\(([MDCLXVI]+)\)( - .*)?$")]
+    private static partial Regex Pattern3Regex();
+
+    [GeneratedRegex(@"^.*\(?Part (\w+)\)?$")]
+    private static partial Regex Pattern4Regex();
 }