def get_catalog_tag_from_id(ident):
    return 'IDRE{:0>3d}'.format(ident)


def get_id_from_catalog_tag(tag):
    try:
        return int(tag[4:])
    except ValueError:
        return -1


def get_contribs(contributors):
    contrib_list = []
    for contrib in contributors:
        contrib_list.append({
            'slug': contrib.slug,
            'name': contrib.name
        })
    return contrib_list