register_command plugin hook

[simonw]

I'm going to start by adding the register_command hook using the exact same pattern as Datasette and LLM.

Originally posted by @simonw in #567 (comment)

[simonw]

Here's where I added that to LLM: simonw/llm@a396950

• Plugin mechanism for registering extra commands llm#49

[simonw]

Example plugin: https://gist.github.com/simonw/ccfbbf9b384a38ac7535b01849f57daf

sqlite-utils install https://gist.github.com/simonw/ccfbbf9b384a38ac7535b01849f57daf/archive/cd7960e476c441a3c5f619e2a44a641a39b91467.zip

pyproject.toml:

[project]
name = "sqlite-utils-hello-world"
version = "0.1"

[project.entry-points.sqlite_utils]
hello_world = "sqlite_utils_hello_world"

sqlite_utils_hello_world.py:

import click
import sqlite_utils


@sqlite_utils.hookimpl
def register_commands(cli):
    @cli.command()
    def hello_world():
        "Say hello world"
        click.echo("Hello world!")

[simonw]

Documentation: https://sqlite-utils.datasette.io/en/latest/plugins.html#register-commands-cli