codejs/src/index.ts at refactor · githubdmn/codejs

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import { statSync } from 'node:fs';

import { join, resolve } from 'node:path';

import { fileURLToPath, pathToFileURL } from 'node:url';

import type { Runner } from './dispatch.types.js';

import { run as runDsa } from './dsa/index.js';

const SRC_ROOT: string = fileURLToPath(new URL('.', import.meta.url));

const DEFAULT_TARGET: string = 'dsa';

const TOPICS: Map<string, Runner> = new Map([['dsa', runDsa]]);

async function main(): Promise<void> {

const target: string = (process.argv[2] ?? DEFAULT_TARGET).replace(/\\/g, '/');

if (target === '') {

console.error('usage: npm run start -- <path-under-src>');

console.error('example: npm run start -- dsa/js-dsa-2e/chapter02');

process.exitCode = 1;

return;

}

// Remove the target so the invoked file only sees its own arguments.

process.argv.splice(2, 1);

try {

const [topic = '', ...rest]: string[] = target.split('/');

const runTopic: Runner | undefined = TOPICS.get(topic);

if (runTopic) {

await runTopic(rest.join('/'));

return;

}

const absolute: string = resolve(SRC_ROOT, target);

const entry: string = statSync(absolute, { throwIfNoEntry: false })?.isDirectory()

? join(absolute, 'index.ts')

: absolute;

await import(pathToFileURL(entry).href);

} catch (err: unknown) {

console.error(`failed to run ${target}:`, err);

process.exitCode = 1;

}

void main();