shell-utils/grep-mtime-sorter.mjs

#!/usr/bin/env node

/* VIBE ALERT

This code was generated using OpenAI's ChatGPT (GPT-5.2 Thinking, large language model).
The output has not been independently reviewed, audited, or comprehensively validated,
and has only been superficially tested. It should be considered experimental and not fully vetted for production use.

*/

import fs from 'node:fs';
import { stat } from 'node:fs/promises';
import { inspect } from 'node:util';

const lineRe = /^\x1b\[35m\x1b\[K(.*?)\x1b/;


function isoFormat(timestamp) {
	if (timestamp) {
		const d = new Date(timestamp * 1000);
		const pad = (n) => String(n).padStart(2, '0');
		return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`;
	} else {
		return 'Unknown';
	}
}

async function getMtime(line) {
	const m = lineRe.exec(line);
	if (m) {
		const filename = m[1];
		try {
			const s = await stat(filename);
			return s.mtimeMs / 1000;
		} catch {
			return 0;
		}
	} else {
		throw new Error(`Malformed input: ANSI prefix not found for line ${inspect(line)}`);
	}
}

async function main() {
	const input = await new Promise((resolve) => {
		let data = '';
		process.stdin.setEncoding('utf8');
		process.stdin.on('data', (chunk) => { data += chunk; });
		process.stdin.on('end', () => { resolve(data); });
	});

	const lines = input.split(/(?<=\n)/).filter(line => line.trim().length > 0);

	const pairs = await Promise.all(
		lines.map(async (line, index) => {
			const t = await getMtime(line);
			return { t, index };
		})
	);

	pairs.sort((a, b) => {
		if (a.t !== b.t) {
			return a.t - b.t;
		} else {
			return a.index - b.index;
		}
	});

	for (const { t, index } of pairs) {
		const ts = isoFormat(t).padStart(16, ' ');
		process.stdout.write(`\x1b[94m${ts}\x1b[0m `);
		process.stdout.write(lines[index]);
	}
}

await main();