func getCommitFromRef()

in iterator/git.go [460:488]

• 24 lines of code
• 7 McCabe index (conditional complexity)

func getCommitFromRef(repository *git.Repository, ref plumbing.ReferenceName) (plumbing.Hash, error) {
	resolved := true
	b, err := repository.Reference(ref, resolved)
	if err != nil {
		return plumbing.ZeroHash, err
	}

	if !b.Name().IsTag() {
		return b.Hash(), nil
	}

	o, err := repository.Object(plumbing.AnyObject, b.Hash())
	if err != nil {
		return plumbing.ZeroHash, err
	}

	switch o := o.(type) {
	case *object.Tag:
		if o.TargetType != plumbing.CommitObject {
			return plumbing.ZeroHash, fmt.Errorf("unsupported tag object target %q", o.TargetType)
		}

		return o.Target, nil
	case *object.Commit:
		return o.Hash, nil
	}

	return plumbing.ZeroHash, fmt.Errorf("unsupported tag target %q", o.Type())
}