list_dirs.go

func listDirectories(path string) ([]string, error) {
	names := []string{}
	items, err := ioutil.ReadDir(path)
	if err != nil {
		return names, err
	}

	for _, item := range items {
		// We only want directories
		if item.IsDir() {
			currentDir := filepath.Join(path, item.Name())
			names = append(names, currentDir)

			// Do some recursion
			subNames, err := listDirectories(currentDir)
			if err == nil {
				names = append(names, subNames...)
			}
		}
	}

	return names, nil
}