Refactor LogFileReader for better testing and fix PluginRegistry initialization

.github/CLAUDE.md

@@ -0,0 +1,230 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+LogExpert is a Windows log file viewer and analyzer built with C# and Windows Forms. It's a GUI replacement for the Unix `tail` command with extensive features including tail mode, filtering, bookmarks, highlighting, and a plugin-based architecture for parsing custom log formats.
+
+**Key Technologies:**
+- .NET 10.0 (Windows target framework)
+- Windows Forms for UI
+- Nuke Build System with MSBuild
+- NUnit for testing
+- Plugin-based architecture
+
+## Build Commands
+
+### Using Nuke Build (Recommended)
+
+```powershell
+# Build the solution
+./build.ps1
+
+# Clean and build
+./build.ps1 --target Clean Compile
+
+# Run tests
+./build.ps1 --target Test
+
+# Full release build with packages
+./build.ps1 --target Clean Pack CreateSetup --configuration Release
+```
+
+### Using .NET CLI Directly
+
+```bash
+# From src/ directory
+dotnet restore
+dotnet build --no-restore
+dotnet test --no-build --verbosity normal
+
+# Run specific test project
+dotnet test src/LogExpert.Tests/LogExpert.Tests.csproj
+```
+
+### Important Build Notes
+
+- **Windows-only**: This project requires Windows and .NET 10.0.100 SDK (specified in [global.json](global.json))
+- **Cannot build on Linux/macOS**: Uses Windows Desktop SDK and Windows Forms
+- Nuke build automatically downloads the correct .NET SDK version if needed
+- Output directory: `bin/(Debug|Release)/`
+
+## Architecture
+
+### High-Level Structure
+
+The codebase follows a modular architecture with clear separation of concerns:
+
+```
+LogExpert/
+├── LogExpert/              # Main application entry point and UI orchestration
+├── LogExpert.Core/         # Core business logic, log reading, filtering
+├── LogExpert.UI/           # Windows Forms UI components and dialogs
+├── LogExpert.Resources/    # Localization resources
+├── LogExpert.Configuration/# Configuration management
+├── ColumnizerLib/          # Plugin interface definitions
+├── PluginRegistry/         # Plugin discovery and security
+└── Columnizers/            # Built-in columnizer plugins (CSV, JSON, Regex, etc.)
+```
+
+### Key Architectural Components
+
+#### 1. Single Instance Mode with IPC
+- Application uses a Mutex to ensure single instance per session
+- Named pipes (`LogExpertInstanceMutex{sessionId}`) for inter-process communication
+- Secondary instances send file paths to primary instance via JSON over named pipes
+- See [Program.cs](src/LogExpert/Program.cs) for implementation
+
+#### 2. Plugin System
+- **Columnizers** (`ILogLineColumnizer`): Parse log lines into columns
+- **File System Plugins** (`IFileSystemPlugin`): Support non-local file sources (e.g., SFTP)
+- **Context Menu Plugins** (`IContextMenuEntry`): Add custom menu items
+- **Keyword Actions** (`IKeywordAction`): React to keywords in logs
+- Plugin discovery happens at startup via `PluginRegistry`
+- Plugins are loaded from `plugins/` and `pluginsx86/` directories
+- Security: Plugin hashes are verified against generated hashes (Release builds only)
+- See [PLUGIN_DEVELOPMENT_GUIDE.md](src/docs/PLUGIN_DEVELOPMENT_GUIDE.md) for details
+
+#### 3. Log File Reading
+- Abstract base class: `PositionAwareStreamReaderBase`
+- Implementations: `PositionAwareStreamReaderSystem`, `PositionAwareStreamReaderLegacy`
+- Uses buffered streams for efficient reading of large files
+- Supports encoding detection (UTF-8, UTF-16, UTF-32 with BOM)
+- Position tracking for tail mode and seeking
+- See [src/LogExpert.Core/Classes/Log/](src/LogExpert.Core/Classes/Log/) for implementations
+
+#### 4. Configuration Management
+- Centralized via `ConfigManager.Instance`
+- Initialized with application startup path and screen information
+- Supports import/export of settings
+- Persists user preferences, columnizer history, highlight masks, etc.
+- Configuration stored in application startup directory (portable mode)
+
+#### 5. Windows Forms UI Architecture
+- MDI interface with tab support via `AbstractLogTabWindow`
+- Main window created in [LogTabWindow.cs](src/LogExpert.UI/Dialogs/LogTabWindow/)
+- Custom controls: `BufferedDataGridView`, `LogTabControl`, `DateTimeDragControl`
+- High DPI considerations: Avoid `AutoScaleMode` and `AutoScaleDimensions` on individual controls
+- Dark mode support via `Application.SetColorMode()`
+
+### Critical Files and Their Purposes
+
+- [Program.cs](src/LogExpert/Program.cs) - Application entry point, IPC setup, single instance handling
+- [AbstractLogTabWindow.cs](src/LogExpert.UI/Extensions/LogWindow/AbstractLogTabWindow.cs) - Main window factory and orchestration
+- [ILogLineColumnizer.cs](src/ColumnizerLib/ILogLineColumnizer.cs) - Core plugin interface for columnizers
+- [ColumnizerPicker.cs](src/LogExpert.Core/Classes/Columnizer/ColumnizerPicker.cs) - Automatic columnizer detection
+- [PluginRegistry.cs](src/PluginRegistry/) - Plugin discovery and security verification
+- [ConfigManager.cs](src/LogExpert.Configuration/) - Configuration persistence and management
+- [LogBuffer.cs](src/LogExpert.Core/Classes/Log/LogBuffer.cs) - In-memory log line caching
+
+## Development Workflow
+
+### Adding a New Columnizer Plugin
+
+1. Create new project in `src/` following naming pattern `*Columnizer`
+2. Add project reference to `ColumnizerLib`
+3. Implement `ILogLineColumnizer` interface
+4. Add project to `src/LogExpert.sln`
+5. Create corresponding test project in `Tests/` folder
+6. Plugin will be auto-discovered at runtime from output directory
+
+### Modifying Core Log Reading Logic
+
+- Core reading classes are in [src/LogExpert.Core/Classes/Log/](src/LogExpert.Core/Classes/Log/)
+- Inherit from `PositionAwareStreamReaderBase` for custom stream readers
+- Key methods to implement: `ReadLine()`, `Position` property, `Seek()`
+- Always maintain position tracking for tail mode support
+
+### Working with Windows Forms UI
+
+- UI components in `LogExpert.UI` project
+- Follow existing High DPI patterns (no AutoScale on controls)
+- Test with both light and dark mode (see `SetDarkMode()` in Program.cs)
+- Use localization resources from `LogExpert.Resources` project
+- Windows Forms designer files: `*.designer.cs`
+
+### Testing
+
+- Unit tests use NUnit framework with Moq for mocking
+- Test projects follow naming pattern `*.Tests`
+- Test data stored in `TestData/` directories within test projects
+- Run all tests: `./build.ps1 --target Test`
+- Run specific test: `dotnet test src/LogExpert.Tests/LogExpert.Tests.csproj`
+
+## Important Patterns and Conventions
+
+### Code Style
+- Nullable reference types enabled (`<Nullable>enable</Nullable>`)
+- Comprehensive `.editorconfig` with 4000+ rules
+- ImplicitUsings enabled
+- Assembly signing enabled (Key.snk)
+
+### Configuration Files
+- **Directory.Build.props** - Common MSBuild properties for all projects
+- **Directory.Packages.props** - Centralized NuGet package version management
+- **global.json** - .NET SDK version pinning (10.0.100)
+- **.editorconfig** - Code style and analysis rules
+
+### Project Organization
+- Solution folders: "Columnizers", "Tests", "docs", "setup"
+- Test projects nested under "Tests" solution folder
+- Columnizer projects nested under "Columnizers" solution folder
+- Documentation in `src/docs/` included in solution
+
+### Git Workflow
+- Default branch: `Development` (use for PRs)
+- Commit format: Include "Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>"
+- GitHub Actions run on push to Development branch
+- AppVeyor for CI builds and artifact creation
+
+## Plugin Security System
+
+**Release builds only:**
+- After compilation, `PluginHashGenerator.Tool` generates SHA256 hashes of all plugins
+- Hashes stored in [PluginHashGenerator.Generated.cs](src/PluginRegistry/PluginHashGenerator.Generated.cs)
+- At runtime, `PluginRegistry` verifies plugin hashes before loading
+- Users can trust new plugins via UI dialog
+- Hash updates automated via GitHub Actions on successful builds
+- See [PLUGIN_HASH_MANAGEMENT.md](src/docs/PLUGIN_HASH_MANAGEMENT.md)
+
+## Common Gotchas
+
+1. **Cross-platform builds fail**: This is Windows-only. Don't attempt Linux/macOS builds.
+2. **SDK version mismatch**: Must use .NET 10.0.100 SDK (specified in global.json)
+3. **Plugin not loading**: Check output directory - plugins must be in `plugins/` or `pluginsx86/`
+4. **High DPI issues**: Never use AutoScaleMode on individual controls, only on forms
+5. **IPC failures**: Named pipes require proper Windows permissions and session isolation
+6. **Encoding detection**: BOM-less files default to encoding from EncodingOptions
+7. **Plugin hashes**: Only verified in Release builds; Debug builds skip verification
+
+## Key Dependencies
+
+- **NLog**: Logging framework
+- **Newtonsoft.Json**: JSON serialization (legacy, but widely used)
+- **CsvHelper**: CSV parsing in CsvColumnizer
+- **SSH.NET**: SFTP support in SftpFileSystem plugins
+- **DockPanelSuite**: Docking panel UI controls
+- **Moq/NUnit**: Testing frameworks
+
+## References
+
+- Main README: [README.md](README.md)
+- Plugin Development: [PLUGIN_DEVELOPMENT_GUIDE.md](src/docs/PLUGIN_DEVELOPMENT_GUIDE.md)
+- Plugin Hash System: [PLUGIN_HASH_MANAGEMENT.md](src/docs/PLUGIN_HASH_MANAGEMENT.md)
+- Performance Benchmarks: [BENCHMARK_SUMMARY.md](src/docs/performance/BENCHMARK_SUMMARY.md)
+- GitHub Wiki: https://github.com/LogExperts/LogExpert/wiki
+- Discord: https://discord.gg/SjxkuckRe9
+
+# Update Rules File
+To update this file, ensure that all sections are kept current with the latest architectural decisions, build processes, and development workflows. Follow these guidelines:
+- Review and update build commands if there are changes in the build system.
+- Reflect any architectural changes in the "Architecture" section.
+- Keep development workflow steps accurate for new contributors.
+- Regularly verify links to other documentation files.
+- Maintain clarity and conciseness for ease of understanding by new developers.
+- Use consistent formatting throughout the document.
+- Add new sections as needed for significant changes in the project structure or processes.
+- Ensure all technical terms are explained or linked to relevant documentation.
+- Periodically review for outdated information and remove or update as necessary.
+- If told to not do something, ensure this is also added to the "Dont Do that" section.

.gitignore

@@ -33,8 +33,8 @@ x86/
 bld/
 [Bb]in/
 [Oo]bj/
-[Ll]og/
-[Ll]ogs/
+/[Ll]og/
+/[Ll]ogs/
 
 # Visual Studio 2015/2017 cache/options directory
 .vs/
@@ -618,3 +618,102 @@ temp.txt
 /Data
 /.tmp
 /.nuke/temp/*.log
+
+# roots docs folder should be empty
+/docs/*
+
+# test project logs should be ignored, this is for rolling logfile tests
+/src/tools/LogRotator/logs/*
+
+######## START JET BRAINS git ignore https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+/src/.idea/*
+
+# Covers JetBrains IDEs: IntelliJ, GoLand, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# AWS User-specific
+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+# see https://community.sonarsource.com/t/is-the-file-idea-idea-idea-sonarlint-xml-intended-to-be-under-source-control/121119
+.idea/sonarlint.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based HTTP Client
+.idea/httpRequests
+http-client.private.env.json
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+# Apifox Helper cache
+.idea/.cache/.Apifox_Helper
+.idea/ApifoxUploaderProjectSetting.xml
+
+# Github Copilot persisted session migrations, see: https://github.com/microsoft/copilot-intellij-feedback/issues/712#issuecomment-3322062215
+.idea/**/copilot.data.migration.*.xml
+
+######## END JET BRAINS git ignore https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore

.vscode/settings.json

@@ -0,0 +1,19 @@
+{
+    "chat.tools.terminal.autoApprove": {
+        "dotnet build": true,
+        "dotnet test": true,
+        "dotnet clean": true,
+        "Out-Null": true,
+        "ForEach-Object": true,
+        "Set-Content": true,
+        "Start-Process": true,
+        "Test-Path": true,
+        "type": true,
+        "New-Item": true,
+        "/^git stash; dotnet test src/LogExpert\\.Tests/LogExpert\\.Tests\\.csproj --filter \"TestShiftBuffers1\" --no-restore 2>&1 \\| Select-Object -Last 30$/": {
+            "approve": true,
+            "matchCommandLine": true
+        },
+        "git rev-parse": true
+    }
+}

src/AutoColumnizer/AutoColumnizer.cs

@@ -62,5 +62,9 @@ public void PushValue (ILogLineMemoryColumnizerCallback callback, int column, st
     {
     }
 
+    public void PushValue (ILogLineMemoryColumnizerCallback callback, int column, string value, ReadOnlyMemory<char> oldValue)
+    {
+    }
+
     #endregion ILogLineColumnizer implementation
 }

src/ColumnizerLib/ILogLineMemoryColumnizer.cs

@@ -94,5 +94,17 @@ public interface ILogLineMemoryColumnizer
     /// <param name="oldValue">The previous value that was associated with the specified column before the update.</param>
     void PushValue (ILogLineMemoryColumnizerCallback callback, int column, string value, string oldValue);
 
+    // <summary>
+    /// <param name="callback">
+    /// The callback interface that receives the value update notification. Cannot be null.
+    /// </param>
+    /// <param name="column">The zero-based index of the column for which the value is being updated.</param>
+    /// <param name="value">The new value to be associated with the specified column.</param>
+    /// <param name="oldValue">
+    /// The previous value <see cref="ReadOnlyMemory{T}"/> associated with the specified
+    /// column before the update.
+    /// </param>
+    void PushValue (ILogLineMemoryColumnizerCallback callback, int column, string value, ReadOnlyMemory<char> oldValue);
+
     #endregion
 }