This plugin uses the common plugin keywords as well as those for “sources”. For more information, see Snapcraft parts metadata.
The following keyword is currently accepted by the plugin:
For examples, search GitHub for projects already using the plugin.
Brian J. Cardiff, one of Crystal’s developers, attended the 2019 Snapcraft Summit Montréal and wrote an excellent overview of how to use the plugin as part of an event write-up. See Snapcraft Summit Montréal for the post.