iosdeveloper is an xbar plugin contributor.
Example of how to include multiple levels of menu items in v1.8 and later.
Quick access to your recent downloads. Enter URL to download from. Specify downloads directory at the top of the file. Defaults to ~/Downloads. Contains example of how to refresh from the command line (see https://github.com/matryer/bitbar/blob/master/Docs/URLScheme.md#refreshplugin)
Lists available updates from the Mac App Store using mas-cli (https://github.com/argon/mas). Based on brew-updates.1h.sh