code: func Open(path string) (*Git, error) {
  	r, err := git.PlainOpen(path)
  	if err != nil {
  		return nil, err
  	}
  
  	w, err := r.Worktree()
  	if err != nil {
  		return nil, err
  	}
  
  	return &Git{
  		path: path,
  		repo: r,
  		wt:   w,
  	}, nil
  }
docs: // Open tries to open an existing git repo on disk