The title might be a misleading, but I can't seem to figure out how to do this git checkout -- ./blah ./foo with the exact behavior in git (i.e. discard unstaged files only). I'd expect it to look something like this:

// Open the repository.
repo, err := git.PlainOpen(path)
if err != nil {
	return err
}

// Get the working directory tree.
w, err := repo.Worktree()
if err != nil {
	return err
}

return w.Checkout(&git.CheckoutOptions{
	Force: true,
	Keep:  true,
        Files: []string{"./blah", "./foo"},
})

I can't find anything in the issues or the codebase that even remotely hints at being able to do this.