git_checkpoint 0.1.0
A Git-based workspace state management system
Requires Python: <4.0,>=3.8

# git-checkpoint

A Git-based workspace state management system that provides efficient codebase state tracking and restoration capabilities.

## How It Works

git-checkpoint uses Git under the hood but operates completely independently from your workspace's version control:

1. Creates a separate "shadow" Git repository in a temporary directory
2. Your workspace files are copied to this shadow repository for tracking
3. All Git operations happen in the shadow repository, never touching your actual workspace's Git state
4. When restoring checkpoints, files are copied back from the shadow repository
5. Your workspace's Git repository (if any) remains completely untouched

## Features

- Shadow Git repository management for non-intrusive state tracking
- Workspace state tracking with commit and restore functionality
- Efficient diff generation between states
- Smart handling of large files (LFS)
- Nested Git repository support
- Configurable file exclusion patterns

## Installation

```bash
# Using poetry (recommended)
poetry add git-checkpoint

# Using pip
pip install git-checkpoint
```

## Quick Start

```python
from git_checkpoint import CheckpointTracker

# Initialize tracker (creates shadow repository in temp directory)
tracker = CheckpointTracker.create(
    task_id="my_task",
    workspace_path="/path/to/workspace"
)

# Create a checkpoint (copies current workspace state to shadow repo)
commit_hash = tracker.commit()

# Get changes between checkpoints
diffs = tracker.get_diff_set(
    lhs_hash="previous_hash",
    rhs_hash="current_hash"
)

# Restore to a previous state (copies files back from shadow repo)
tracker.reset_head("previous_hash")

# Clean up shadow repository when done
tracker.cleanup()
```

## Configuration

Create a `.checkpointrc` file in your workspace:

```yaml
enabled: true
storage_path: ".checkpoints"
ignore_patterns:
  - "*.pyc"
  - "__pycache__"
  - "node_modules"
  - ".git"
```

## API Reference

### CheckpointTracker

#### Constructor
```python
def __init__(self, task_id: str, workspace_path: str)
```
- `task_id`: Unique identifier for the checkpoint session
- `workspace_path`: Path to the workspace to track

#### Methods

##### create
```python
@classmethod
def create(cls, task_id: str, workspace_path: str) -> "CheckpointTracker"
```
Creates and initializes a new checkpoint tracker.

##### commit
```python
def commit(self) -> Optional[str]
```
Creates a new checkpoint of the current workspace state. Returns the commit hash.

##### reset_head
```python
def reset_head(self, commit_hash: str) -> None
```
Restores the workspace to the state of the specified commit.

##### get_diff_set
```python
def get_diff_set(
    self,
    lhs_hash: Optional[str],
    rhs_hash: Optional[str]
) -> List[DiffInfo]
```
Returns a list of file differences between two commits.

## Development

```bash
# Install dependencies
poetry install

# Run tests
poetry run pytest tests/ -v

# Run tests with coverage
poetry run pytest tests/ -v --cov=git_checkpoint
```

## Error Handling

The package uses custom exceptions for common error cases:

- `WorkspaceError`: Invalid workspace configuration
- `GitError`: Git operation failures
- `ConfigError`: Configuration parsing issues

## Best Practices

1. Always validate workspace paths before initialization
2. Use meaningful task IDs for better organization
3. Handle large files appropriately using LFS
4. Regularly clean up old checkpoints to manage storage

## License

MIT License - See LICENSE file for details