New: Support for .plexmatch series metadata files

Closes #4960

src/NzbDrone.Core/Extras/Metadata/Consumers/Plex/PlexMetadata.cs

@@ -0,0 +1,77 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Core.Extras.Metadata.Files;
+using NzbDrone.Core.MediaFiles;
+using NzbDrone.Core.Tv;
+
+namespace NzbDrone.Core.Extras.Metadata.Consumers.Plex
+{
+    public class PlexMetadata : MetadataBase<PlexMetadataSettings>
+    {
+        public override string Name => "Plex";
+
+        public override MetadataFile FindMetadataFile(Series series, string path)
+        {
+            var filename = Path.GetFileName(path);
+
+            if (filename == null)
+            {
+                return null;
+            }
+
+            var relativePath = series.Path.GetRelativePath(path);
+
+            if (relativePath == ".plexmatch")
+            {
+                return new MetadataFile
+                {
+                    SeriesId = series.Id,
+                    Consumer = GetType().Name,
+                    RelativePath = series.Path.GetRelativePath(path),
+                    Type = MetadataType.SeriesMetadata
+                };
+            }
+
+            return null;
+        }
+
+        public override MetadataFileResult SeriesMetadata(Series series)
+        {
+            if (!Settings.SeriesPlexMatchFile)
+            {
+                return null;
+            }
+
+            var content = new StringBuilder();
+
+            content.AppendLine($"Title: {series.Title}");
+            content.AppendLine($"Year: {series.Year}");
+            content.AppendLine($"TvdbId: {series.TvdbId}");
+            content.AppendLine($"ImdbId: {series.ImdbId}");
+
+            return new MetadataFileResult(".plexmatch", content.ToString());
+        }
+
+        public override MetadataFileResult EpisodeMetadata(Series series, EpisodeFile episodeFile)
+        {
+            return null;
+        }
+
+        public override List<ImageFileResult> SeriesImages(Series series)
+        {
+            return new List<ImageFileResult>();
+        }
+
+        public override List<ImageFileResult> SeasonImages(Series series, Season season)
+        {
+            return new List<ImageFileResult>();
+        }
+
+        public override List<ImageFileResult> EpisodeImages(Series series, EpisodeFile episodeFile)
+        {
+            return new List<ImageFileResult>();
+        }
+    }
+}

src/NzbDrone.Core/Extras/Metadata/Consumers/Plex/PlexMetadataSettings.cs

@@ -0,0 +1,32 @@
+using FluentValidation;
+using NzbDrone.Core.Annotations;
+using NzbDrone.Core.ThingiProvider;
+using NzbDrone.Core.Validation;
+
+namespace NzbDrone.Core.Extras.Metadata.Consumers.Plex
+{
+    public class PlexMetadataSettingsValidator : AbstractValidator<PlexMetadataSettings>
+    {
+        public PlexMetadataSettingsValidator()
+        {
+        }
+    }
+
+    public class PlexMetadataSettings : IProviderConfig
+    {
+        private static readonly PlexMetadataSettingsValidator Validator = new PlexMetadataSettingsValidator();
+
+        public PlexMetadataSettings()
+        {
+            SeriesPlexMatchFile = true;
+        }
+
+        [FieldDefinition(0, Label = "Series Plex Match File", Type = FieldType.Checkbox, Section = MetadataSectionType.Metadata, HelpText = "Creates a .plexmatch file in the series folder")]
+        public bool SeriesPlexMatchFile { get; set; }
+
+        public NzbDroneValidationResult Validate()
+        {
+            return new NzbDroneValidationResult(Validator.Validate(this));
+        }
+    }
+}