Index

`Hub`	hub_id -> [HubMeta, HubLinks]
`HubLinks`	A set of hub IDs.
`HubMeta`	title, description, zeronet_version
`Hubs`	A set of `Hub`s.
`LoadJsonFail`	When failed to parse a string as json object.
`UsageError`	Command line usage error, e.g. missing argument for option.
`crawl()`	Gluing code or the real entry point. R
`crawl_all()`	Returns
`crawl_all_hubs()`	Crawl zerome user register for hubs.
`crawl_links()`	Given a hub site path, returns all hub IDs whose users are followed by the given hub.
`get_follow()`	Returns non empty follow array.
`get_json_string()`	Given a json object and a key, returns object[key] iff object[key] is a string.
`get_userdb_dir()`	Returns `data/REGISTRY_ID/data/userdb/`.
`jsonify()`	Returns JsonObject for `Hub` and JsonArray of JsonObject for `Hubs`.
`load_json_object()`	Returns null if parsed result of file is not JsonObject.
`meta()`	Parse content.json of a hub for meta data.
`read_file()`	Read the file whole.
`resolve_directory()`	Resolve a link to direcotry.
`resolve_file()`	Resolve a link to direcotry.
`resolve_path_to_directory()`	Resolve a path to a direcotry.
`resolve_path_to_file()`	Resolve a path to a flie.
`run()`	The ultimate exception handler.