# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [1.2.0] - 2025-02-12

### Added
- **`--max-depth N` option**: Limit recursion depth to N levels (requires `-r/--recursive`)
- **Explicit symlink handling**: Symlinks are no longer followed (`follow_links(false)`)
  - Default: Symlinks are completely skipped (not renamed, not followed)
  - With `--special`: Only the symlink name is sanitized, target remains unchanged
  - Prevents infinite loops from circular symlinks
  - Prevents unintended changes outside target directory
- **Verbose symlink logging**: Shows which symlinks are skipped when using `-v`

### Changed
- `WalkDir` now explicitly uses `follow_links(false)` for safety
- Improved verbose logging to indicate when max-depth is active

### Technical
- Added 5 new integration tests for max-depth and symlink behavior
- All tests passing (30 total: 25 existing + 5 new)
- Unix-specific symlink tests use `#[cfg(unix)]` attribute

## [1.1.0] - 2025-02-10

### Added
- **`-s/--sequence <name>` option**: Select transformation sequence (default, lower, upper, minimal, utf-8)
- **`-L` option**: List all available sequences (use with `-v` for details)
- **5 hardcoded sequences**:
  - `default`: Current behavior (umlauts→ASCII, spaces→underscores)
  - `lower`: Like default + convert to lowercase
  - `upper`: Like default + convert to UPPERCASE
  - `minimal`: Only replace spaces, keep UTF-8 characters
  - `utf-8`: UTF-8 friendly (keep umlauts, remove special chars)

### Changed
- Refactored `clean_filename()` to support sequence-based transformations
- Umlaut replacements moved from hardcoded to sequence-specific logic
- Case transformations now also apply to file extensions

### Technical
- Added `Sequence` struct and `CaseTransform` enum in `sanitizer.rs`
- Extended CLI with `-s` and `-L` options
- Added `list_sequences()` function in `main.rs`
- Updated all unit tests to pass `Sequence` parameter
- Added 8 new integration tests for sequence functionality

## [1.0.0] - 2025-02-10

### ⚠️ BREAKING CHANGES
- **Recursion is now opt-in**: By default, `ntu` only processes the specified
  paths and their immediate children. Use `-r`/`--recursive` flag to enable
  recursive directory traversal.
- Migration: Add `-r` to existing commands to preserve v0.x behavior

### Added
- **`--conf <FILE>` option**: Specify a single configuration file, bypassing
  the default hierarchy (/etc → ~/.config → ./). Errors if file doesn't exist.
- **`-r/--recursive` flag**: Enable recursive directory processing

### Changed
- Default behavior is now non-recursive (use `-r` for recursive processing)
- All integration tests updated to explicitly use `-r` flag

### Migration Guide
```bash
# Old command (v0.x - always recursive):
ntu /path/to/files

# New equivalent (v1.x - explicit recursion):
ntu -r /path/to/files
```

## [0.3.0] - 2025-02-10

### Added
- **CI/CD Pipeline**: Automated testing and release builds via GitHub Actions
  - CI workflow: Tests on Rust stable and beta, Clippy, rustfmt checks
  - Release workflow: Multi-platform builds (Linux x86_64, Linux musl, macOS Intel, macOS ARM)
- **Shell Completions**: Auto-completion support for all major shells
  - Bash completion (`completions/ntu.bash`)
  - Zsh completion (`completions/_ntu`)
  - Fish completion (`completions/ntu.fish`)
- **Manpage**: Professional manual page (`man/ntu.1`) with full documentation
- **Colored Output**: Terminal colors for better visual feedback
  - Green for successful renames
  - Yellow for dry-run mode
  - Red for errors
  - Cyan/bold for statistics
  - `--no-color` flag to disable colors
- **Integration Tests**: 13 comprehensive integration tests using `assert_cmd`
- **README**: Installation instructions for pre-built binaries, badges (CI, Release, Version, License)

### Changed
- Improved `.gitignore` with better organization
- Better error messages with colored output
- Updated test framework to use modern `cargo_bin!` macro

### Fixed
- Removed unused `warn` import

## [0.2.0] - 2025-02-10

### Added
- **CLI**: `--dry-run` as primary option (with `--no-changes` as deprecated alias for backward compatibility)
- **CLI**: `--special` flag to process symlinks and special files (normally skipped)
- **Smart Default Excludes**: Automatically ignore `.git`, `.svn`, `node_modules`, `.cache`, `__pycache__`
- **Double Extensions**: Proper handling of `.tar.gz`, `.tar.bz2`, `.tar.xz`, `.tar.zst`, `.tar.lz`, `.tar.Z`
- **Parallel Processing**: Using `rayon` for parallel filename cleaning when processing ≥100 files
- **Write Permission Checks**: Check write permissions before attempting rename operations
- **Unit Tests**: 9 comprehensive tests for `clean_filename()` covering edge cases

### Fixed
- **Critical Bug**: Hidden files (like `.gitignore`) are no longer incorrectly renamed to `unnamed.xxx`
- Leading dot in hidden files is now correctly preserved
- Fixed all clippy warnings

### Changed
- Binary renamed from `NameToUnix` to `ntu` (shorter CLI usage)
- Improved error messages for permission issues
- Better handling of hidden files with spaces (`.my config` → `.my_config`)

### Performance
- Parallel processing with rayon for large directory trees (threshold: 100 files)
- Optimized regex patterns using `once_cell::Lazy`

## [0.1.0] - 2025-03-07

### Added
- Initial release
- Basic filename sanitization
- Configurable replacements via TOML
- Recursive directory processing
- Exclude patterns support
- German umlaut conversion
- Special identifier preservation (C++, C#)