I'm experimenting with a Datasette plugin that itself adds new plugin hooks which other plugins can then interact with.
\nIt's called datasette-low-disk-space-hook, and it adds a new plugin hook called low_disk_space(datasette), defined in the datasette_low_disk_space_hook/hookspecs.py module.
The hook is registered by this code in datasette_low_disk_space_hook/__init__.py
\nfrom datasette.utils import await_me_maybe\nfrom datasette.plugins import pm\nfrom . import hookspecs\n\npm.add_hookspecs(hookspecs)This imports the plugin manager directly from Datasette and uses it to add the new hooks.
\nI was worried that the pm.add_hookspects(hookspecs) line was not guaranteed to be executed if that module had not been imported.
It turns out that having this entrpoints= line in setup.py is enough to ensure that the module is imported and the pm.add_hookspecs() line is executed:
from setuptools import setup\n\nsetup(\n name=\"datasette-low-disk-space-hook\",\n # ...\n entry_points={\"datasette\": [\"low_disk_space_hook = datasette_low_disk_space_hook\"]},\n # ...\n)