Add MultiFile max file age option

src/ColumnizerLib/ILogFileInfo.cs

@@ -51,6 +51,12 @@ public interface ILogFileInfo
     /// </summary>
     bool FileExists { get; }
 
+    /// <summary>
+    /// Gets the time when the file was last written, in UTC, or <see langword="null"/> when the file system plugin
+    /// cannot provide it.
+    /// </summary>
+    DateTime? LastWriteTimeUtc => null;
+
     /// <summary>
     /// The interval (in ms) LogExpert should check for file changes. The property is checked by LogExpert repeatedly in the loop which
     /// checks for file changes. So you can adjust the poll interval as needed. E.g. you can lower the interval when many changes occur and

src/LogExpert.Core/Classes/Log/RolloverFilenameHandler.cs

@@ -21,6 +21,7 @@ public class RolloverFilenameHandler
     private readonly RolloverFilenameBuilder _filenameBuilder;
     private readonly ILogFileInfo _logFileInfo;
     private readonly MultiFileOptions _options;
+    private readonly TimeProvider _timeProvider;
 
     #endregion
 
@@ -31,10 +32,12 @@ public class RolloverFilenameHandler
     /// </summary>
     /// <param name="logFileInfo">The complete path of the logfile</param>
     /// <param name="options">Multifile option (e.g. format pattern)</param>
-    public RolloverFilenameHandler(ILogFileInfo logFileInfo, MultiFileOptions options)
+    /// <param name="timeProvider">Time source used to calculate the file-age cutoff.</param>
+    public RolloverFilenameHandler(ILogFileInfo logFileInfo, MultiFileOptions options, TimeProvider? timeProvider = null)
     {
         _options = options;
         _logFileInfo = logFileInfo;
+        _timeProvider = timeProvider ?? TimeProvider.System;
         _filenameBuilder = new RolloverFilenameBuilder(_options.FormatPattern);
         _filenameBuilder.SetFileName(logFileInfo.FileName);
     }
@@ -69,12 +72,18 @@ public LinkedList<string> GetNameList(IPluginRegistry pluginRegistry)
                 _filenameBuilder.Index += 1;
                 fileName = _filenameBuilder.BuildFileName();
                 filePath = _logFileInfo.DirectoryName + _logFileInfo.DirectorySeparatorChar + fileName;//TODO: Change to Directory.Combine
-                if (FileExists(filePath, pluginRegistry))
+                var result = GetCandidateResult(filePath, pluginRegistry);
+                if (result == CandidateResult.Include)
                 {
                     _ = fileList.AddFirst(filePath);
                     found = true;
                     continue;
                 }
+
+                if (result == CandidateResult.TooOld)
+                {
+                    return fileList;
+                }
             }
 
             // if file with index isn't found or no index is in format pattern, decrement the current date
@@ -87,13 +96,19 @@ public LinkedList<string> GetNameList(IPluginRegistry pluginRegistry)
                     _filenameBuilder.DecrementDate();
                     fileName = _filenameBuilder.BuildFileName();
                     filePath = _logFileInfo.DirectoryName + _logFileInfo.DirectorySeparatorChar + fileName;//TODO: Change to Directory.Combine
-                    if (FileExists(filePath, pluginRegistry))
+                    var result = GetCandidateResult(filePath, pluginRegistry);
+                    if (result == CandidateResult.Include)
                     {
                         _ = fileList.AddFirst(filePath);
                         found = true;
                         break;
                     }
 
+                    if (result == CandidateResult.TooOld)
+                    {
+                        return fileList;
+                    }
+
                     tryCounter++;
                 }
             }
@@ -106,17 +121,36 @@ public LinkedList<string> GetNameList(IPluginRegistry pluginRegistry)
 
     #region Private Methods
 
-    private bool FileExists(string filePath, IPluginRegistry pluginRegistry)
+    private CandidateResult GetCandidateResult(string filePath, IPluginRegistry pluginRegistry)
     {
         var fs = pluginRegistry.FindFileSystemForUri(filePath);
 
         if(fs == null)
         {
-            return false; 
+            return CandidateResult.Missing;
         }
 
         var info = fs.GetLogfileInfo(filePath);
-        return info is not null && info.FileExists;
+        if (info is null || !info.FileExists)
+        {
+            return CandidateResult.Missing;
+        }
+
+        var maxFileAgeDays = MultiFileOptions.ClampMaxFileAgeDays(_options.MaxFileAgeDays);
+        if (maxFileAgeDays == 0 || info.LastWriteTimeUtc is not { } lastWriteTimeUtc)
+        {
+            return CandidateResult.Include;
+        }
+
+        var cutoffUtc = _timeProvider.GetUtcNow().UtcDateTime - TimeSpan.FromDays(maxFileAgeDays);
+        return lastWriteTimeUtc >= cutoffUtc ? CandidateResult.Include : CandidateResult.TooOld;
+    }
+
+    private enum CandidateResult
+    {
+        Missing,
+        Include,
+        TooOld
     }
 
     #endregion

src/LogExpert.Core/Classes/Persister/PersistenceData.cs

@@ -71,6 +71,8 @@ public class PersistenceData
 
     public int MultiFileMaxDays { get; set; }
 
+    public int MultiFileMaxFileAgeDays { get; set; }
+
     public List<string> MultiFileNames { get; set; } = [];
 
     public string MultiFilePattern { get; set; }

src/LogExpert.Core/Classes/Persister/SessionFileComposer.cs

@@ -36,6 +36,7 @@ public static PersistenceData Compose (SessionSnapshot snapshot)
             FilterSaveListVisible = snapshot.FilterSaveListVisible,
             MultiFile = snapshot.MultiFile,
             MultiFileMaxDays = snapshot.MultiFileMaxDays,
+            MultiFileMaxFileAgeDays = snapshot.MultiFileMaxFileAgeDays,
             MultiFilePattern = snapshot.MultiFilePattern,
             TabName = snapshot.TabName,
             HighlightGroupName = snapshot.HighlightGroupName,
@@ -83,6 +84,7 @@ public static SessionSnapshot Decompose (PersistenceData persistenceData)
             FilterSaveListVisible = persistenceData.FilterSaveListVisible,
             MultiFile = persistenceData.MultiFile,
             MultiFileMaxDays = persistenceData.MultiFileMaxDays,
+            MultiFileMaxFileAgeDays = persistenceData.MultiFileMaxFileAgeDays,
             MultiFilePattern = persistenceData.MultiFilePattern,
             TabName = persistenceData.TabName,
             HighlightGroupName = persistenceData.HighlightGroupName,

src/LogExpert.Core/Classes/Persister/SessionSnapshot.cs

@@ -43,6 +43,8 @@ public class SessionSnapshot
 
     public int MultiFileMaxDays { get; set; }
 
+    public int MultiFileMaxFileAgeDays { get; set; }
+
     public string MultiFilePattern { get; set; }
 
     public string TabName { get; set; }

src/LogExpert.Core/Entities/MultifileOptions.cs

@@ -5,8 +5,24 @@ public class MultiFileOptions
 {
     #region Properties
 
+    /// <summary>
+    /// The largest file age exposed by the UI and accepted by the rollover reader, in days.
+    /// </summary>
+    public const int MAX_FILE_AGE_DAYS = 3650;
+
     public int MaxDayTry { get; set; } = 3;
 
+    /// <summary>
+    /// Gets or sets the maximum age, in days, of rollover files loaded into a MultiFile. Zero disables the limit.
+    /// Values greater than <see cref="MAX_FILE_AGE_DAYS"/> are treated as that maximum.
+    /// </summary>
+    public int MaxFileAgeDays { get; set; }
+
+    public static int ClampMaxFileAgeDays (int value)
+    {
+        return Math.Clamp(value, 0, MAX_FILE_AGE_DAYS);
+    }
+
     public string FormatPattern { get; set; } = "*$J(.)";
 
     #endregion

src/LogExpert.Persister.Tests/PersisterTests.cs

@@ -357,6 +357,7 @@ public void RoundTrip_WithApplicationStartupDir_PreservesAllData ()
             MultiFile = true,
             MultiFilePattern = "test*.log",
             MultiFileMaxDays = 7,
+            MultiFileMaxFileAgeDays = 5,
             LineCount = 1000,
             CellSelectMode = true
         };
@@ -377,6 +378,8 @@ public void RoundTrip_WithApplicationStartupDir_PreservesAllData ()
         Assert.That(loadedData.MultiFile, Is.EqualTo(originalData.MultiFile), "MultiFile should match");
         Assert.That(loadedData.MultiFilePattern, Is.EqualTo(originalData.MultiFilePattern), "MultiFilePattern should match");
         Assert.That(loadedData.MultiFileMaxDays, Is.EqualTo(originalData.MultiFileMaxDays), "MultiFileMaxDays should match");
+        Assert.That(loadedData.MultiFileMaxFileAgeDays, Is.EqualTo(originalData.MultiFileMaxFileAgeDays),
+            "MultiFileMaxFileAgeDays should match");
         Assert.That(loadedData.LineCount, Is.EqualTo(originalData.LineCount), "LineCount should match");
         Assert.That(loadedData.CellSelectMode, Is.EqualTo(originalData.CellSelectMode), "CellSelectMode should match");
     }

src/LogExpert.Persister.Tests/PersisterXmlMalformedTests.cs

@@ -44,6 +44,7 @@ public void Load_FileElementWithoutOptions_ReturnsDefaults ()
             Assert.That(data.MultiFile, Is.False);
             Assert.That(data.MultiFilePattern, Is.Null);
             Assert.That(data.MultiFileMaxDays, Is.Zero);
+            Assert.That(data.MultiFileMaxFileAgeDays, Is.Zero);
             Assert.That(data.FilterVisible, Is.False);
 
             // A missing <options> means "nothing was persisted", so every option keeps its

src/LogExpert.Persister.Tests/SessionFileComposerTests.cs

@@ -172,6 +172,7 @@ private static SessionSnapshot CreateFullSnapshot (int filterTabDepth = 2)
             FilterSaveListVisible = true,
             MultiFile = true,
             MultiFileMaxDays = 7,
+            MultiFileMaxFileAgeDays = 5,
             MultiFilePattern = "app*.log",
             TabName = "My Tab",
             HighlightGroupName = "Errors",
@@ -247,6 +248,7 @@ private static PersistenceData CreateCarriedPersistenceData (int filterTabDepth)
             FilterSaveListVisible = true,
             MultiFile = true,
             MultiFileMaxDays = 7,
+            MultiFileMaxFileAgeDays = 5,
             MultiFilePattern = "app*.log",
             TabName = "My Tab",
             HighlightGroupName = "Errors",
@@ -422,6 +424,28 @@ public void DiskTrip_ComposePersistLoadDecompose_ReturnsEqualSnapshot ()
         Assert.That(SerializeForComparison(roundTripped), Is.EqualTo(SerializeForComparison(snapshot)));
     }
 
+    [Test]
+    public void Decompose_LegacyJsonWithoutMaxFileAgeDays_DefaultsToOff ()
+    {
+        var sessionFileName = Path.Join(_testDirectory, "legacy-json.lxp");
+        File.WriteAllText(sessionFileName, """
+            {
+              "MultiFile": true,
+              "MultiFileMaxDays": 7,
+              "MultiFilePattern": "*$J(.)"
+            }
+            """);
+
+        var loaded = Core.Classes.Persister.Persister.Load(sessionFileName);
+        var snapshot = SessionFileComposer.Decompose(loaded);
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(loaded.MultiFileMaxFileAgeDays, Is.Zero);
+            Assert.That(snapshot.MultiFileMaxFileAgeDays, Is.Zero);
+        });
+    }
+
     #endregion
 
     #region Window filter (issue #666)
@@ -490,6 +514,8 @@ public void Decompose_LegacyXmlSessionFileOnDisk_TakesTheFirstFilterAsTheWindowF
         Assert.That(snapshot.FilterParams.SearchText, Is.EqualTo("the first global filter"));
         Assert.That(snapshot.FilterParams.SpreadBefore, Is.EqualTo(1),
             "the restored entry must be the first one, whole — the second carries SpreadBefore 2");
+        Assert.That(snapshot.MultiFileMaxFileAgeDays, Is.Zero,
+            "legacy XML Session Files without the new field must keep age filtering disabled");
         Assert.That(snapshot.FilterParams.Color, Is.EqualTo(Color.Black),
             "Color is the field the legacy payload writes as \"Black\" — losing it means the entry was not really read");
     }