Add better AYCL detection and add verbose library scan logging

Source/FileManager/LogArchiver.cs

@@ -0,0 +1,67 @@
+using Dinah.Core;
+using Newtonsoft.Json.Linq;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.IO.Compression;
+using System.Linq;
+using System.Text;
+
+namespace FileManager
+{
+	public class LogArchiver : IDisposable
+	{
+		public Encoding Encoding { get; set; }
+		public string FileName { get; }
+		private readonly ZipArchive archive;
+
+		public LogArchiver(string filename) : this(filename, Encoding.UTF8) { }
+		public LogArchiver(string filename, Encoding encoding)
+		{
+			FileName = ArgumentValidator.EnsureNotNull(filename, nameof(filename));
+			Encoding = ArgumentValidator.EnsureNotNull(encoding, nameof(encoding));
+			archive = new ZipArchive(File.Open(FileName, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite), ZipArchiveMode.Update, false, Encoding);
+		}
+
+		public void DeleteOlderThan(DateTime cutoffDate)
+			=> DeleteEntries(archive.Entries.Where(e => e.LastWriteTime < cutoffDate).ToList());
+
+		public void DeleteOldestN(int quantity)
+			=> DeleteEntries(archive.Entries.OrderBy(e => e.LastWriteTime).Take(quantity).ToList());
+		
+		public void DeleteAllButNewestN(int quantity)
+			=> DeleteEntries(archive.Entries.OrderByDescending(e => e.LastWriteTime).Skip(quantity).ToList());
+		
+		private void DeleteEntries(List<ZipArchiveEntry> entries)
+		{
+			foreach (var e in entries)
+				e.Delete();
+		}
+
+		public void AddFile(string name, JObject contents, string comment = null)
+			=> AddFile(name, Encoding.GetBytes(contents.ToString(Newtonsoft.Json.Formatting.Indented)), comment);
+
+		public void AddFile(string name, string contents, string comment = null)
+			=> AddFile(name, Encoding.GetBytes(contents), comment);
+
+		private readonly object lockOob = new();
+
+		public void AddFile(string name, ReadOnlySpan<byte> contents, string comment = null)
+		{
+			ArgumentValidator.EnsureNotNull(name, nameof(name));
+
+			name = ReplacementCharacters.Barebones.ReplaceFilenameChars(name);
+
+			lock (lockOob)
+			{
+				var entry = archive.CreateEntry(name, CompressionLevel.SmallestSize);
+
+				entry.Comment = comment;
+				using var entryStream = entry.Open();
+				entryStream.Write(contents);
+			}
+		}
+
+		public void Dispose() => archive.Dispose();
+	}
+}