tesseract/packages/amanuensis/src/index.ts

#!/usr/bin/env node

import { hideBin } from 'yargs/helpers';
import yargs from 'yargs';

const main = async (args: string[]) => {
	const COMMANDS = {
		serve: await import('../commands/serve'),
		generate: await import('../commands/generate'),
	};

	const yargsBuilder = Object.entries(COMMANDS).reduce(
		(theYargs, [name, command]) => theYargs.command(
				name,
				command.description ?? '',
				command.builder ?? ((commandYargs) => commandYargs),
			),
		yargs
			.scriptName('amanuensis'),
	);

	const { _: commandNamesRaw, ...etcArgs } = await yargsBuilder.parse(args);

	const [commandName, ...subcommands] = commandNamesRaw as [keyof typeof COMMANDS, ...string[]];
	if (typeof commandName === 'undefined') {
		yargsBuilder.showHelp();
		return -1;
	}

	const { [commandName]: commandDef } = COMMANDS;
	if (typeof commandDef === 'undefined') {
		process.stderr.write(`Unknown command: ${commandName}\n`);
		yargsBuilder.showHelp();
		return -1;
	}

	const { default: handler } = commandDef;
	return handler({
		...etcArgs,
		subcommands,
	});
};

main(hideBin(process.argv))
	.then((code = 0) => {
		// noop
		process.exit(code);
	})
	.catch(() => {
		process.exit(-1);
	});