cache

var Get = func() (*Cache, error) {
	p := resolvePath()

	if _, err := os.Stat(p); os.IsNotExist(err) {
		if err := initCacheFile(p); err != nil {
			return nil, errors.Wrap(err, "failed to create a new cache file")
		}
	} else if err != nil {
		return nil, errors.Wrapf(err, "failed to check the existence of cache file '%s'", p)
	}

	f, err := os.Open(p)
	if err != nil {
		return nil, errors.Wrap(err, "failed to open the cache file")
	}
	defer f.Close()

	var c Cache
	if err := decodeTOML(f, &c); err != nil {
		return nil, errors.Wrap(err, "failed to decode loaded cache content")
	}

	if c.Version == "" || c.Version != meta.Version.String() {
		if err := initCacheFile(p); err != nil {
			return nil, errors.Wrap(err, "failed to clear the cache file")
		}
		if _, err := f.Seek(0, 0); err != nil {
			return nil, errors.Wrap(err, "failed to move to the first")
		}
		if err := decodeTOML(f, &c); err != nil {
			return nil, errors.Wrap(err, "failed to decode cache content")
		}
	}

	return &c, nil
}