prune-backup 0.1.2

Prune backup files based on retention policies, keeping recent files and moving old ones to trash
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# prune-backup

A CLI tool for managing backup file rotation. Scans a directory and applies retention policies based on file timestamps, moving old files to the system trash.

## Installation

```bash
# From crates.io
cargo install prune-backup

# From source
cargo install --path .
```

## Usage

```bash
prune-backup <DIRECTORY> [OPTIONS]
```

### Options

| Option | Default | Description |
|--------|---------|-------------|
| `--keep-last <N>` | 5 | Keep the last N backups (must be at least 1) |
| `--keep-hourly <N>` | 24 | Keep one backup per hour for the last N hours |
| `--keep-daily <N>` | 7 | Keep one backup per day for the last N days |
| `--keep-weekly <N>` | 4 | Keep one backup per week for the last N weeks (ISO week system) |
| `--keep-monthly <N>` | 12 | Keep one backup per month for the last N months |
| `--keep-yearly <N>` | 10 | Keep one backup per year for the last N years |
| `--dry-run` | - | Show what would be moved without actually moving files |
| `--trash-cmd <CMD>` | - | Use a custom command to trash files instead of the system trash |

### Examples

```bash
# Use default retention policies
prune-backup /path/to/backups

# Keep only the last 10 backups and 30 days of daily backups
prune-backup /path/to/backups --keep-last 10 --keep-daily 30

# Preview what would be pruned
prune-backup /path/to/backups --dry-run

# Use a custom trash command (permanently delete files)
prune-backup /path/to/backups --trash-cmd "rm"

# Use trash-cli on Linux
prune-backup /path/to/backups --trash-cmd "trash-put"

# Move files to a custom directory using {} placeholder
prune-backup /path/to/backups --trash-cmd "mv {} /path/to/trash/"
```

## Configuration File

You can place a `.retention` file in the target directory to set default retention policies. The file uses TOML format:

```toml
keep-last = 10
keep-hourly = 48
keep-daily = 14
keep-weekly = 8
keep-monthly = 24
keep-yearly = 5
```

Configuration priority (highest to lowest):
1. Command-line arguments
2. `.retention` file values
3. Built-in defaults

## How It Works

1. Scans all non-hidden files in the target directory
2. Reads file modification timestamps (falls back to creation time if unavailable)
3. Applies retention policies independently (a file can be kept by multiple policies):
   - **keep-last**: Keeps the N most recent files
   - **keep-hourly**: Keeps the oldest file from each hour within the retention window
   - **keep-daily**: Keeps the oldest file from each day within the retention window
   - **keep-weekly**: Keeps the oldest file from each ISO week (Monday-Sunday) within the retention window
   - **keep-monthly**: Keeps the oldest file from each month within the retention window
   - **keep-yearly**: Keeps the oldest file from each year within the retention window
4. Logs which policies matched each kept file (e.g., `Keeping: backup.tar.gz (keep-last, daily, monthly)`)
5. Moves files not matching any policy to the system trash (or uses a custom command if `--trash-cmd` is specified)

### Custom Trash Command

The `--trash-cmd` option allows you to specify a custom command for handling files to be removed. The file path is passed to the command in one of two ways:

- **With `{}` placeholder**: If your command contains `{}`, it will be replaced with the (shell-escaped) file path. Example: `--trash-cmd "mv {} /backup/trash/"`
- **Without placeholder**: If no `{}` is present, the file path is appended to the end of the command. Example: `--trash-cmd "rm"` becomes `rm /path/to/file`

Files are never permanently deleted by default—they're moved to your system's trash/recycle bin for manual review or recovery.

## License

MIT