gen_snapshot.js
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gen_snapshot.js
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	import * as esbuild from 'esbuild';
	import { writeFileSync } from 'node:fs';

	function generateHeader(inputFile, bytes) {
	const lines = [];
	for (let i = 0; i < bytes.length; i += 16) {
	lines.push(' ' + bytes.slice(i, i + 16).join(', '));
	}

	return `/* Auto-generated snapshot from ${inputFile} */
	/* DO NOT EDIT - Generated during build */

	#ifndef ANT_SNAPSHOT_DATA_H
	#define ANT_SNAPSHOT_DATA_H

	#include <stddef.h>
	#include <stdint.h>

	static const uint8_t ant_snapshot_source[] = {
	${lines.join(',\n')}
	};

	/* bundled source size: ${bytes.length} bytes */
	static const size_t ant_snapshot_source_len = ${bytes.length};

	#endif /* ANT_SNAPSHOT_DATA_H */
	`;
	}

	async function main() {
	const args = process.argv.slice(2);

	if (args.length < 2) {
	console.error(`Usage: ${process.argv[1]} <input.js> <output.h> [KEY=value...]`);
	console.error(`Example: ${process.argv[1]} core.js snapshot.h VERSION=1.0.0 GIT_HASH=abc123`);
	process.exit(1);
	}

	const [inputFile, outputFile, ...rawArgs] = args;

	const replacements = rawArgs.reduce((acc, arg) => {
	const pivot = arg.indexOf('=');
	if (pivot === -1) return acc;
	const key = arg.slice(0, pivot);
	let value = arg.slice(pivot + 1);

	if (value === 'true') value = true;
	else if (value === 'false') value = false;

	acc[`import.meta.env.${key}`] = JSON.stringify(value);
	return acc;
	}, {});

	const result = await esbuild.build({
	minify: true,
	bundle: true,
	write: false,
	format: 'esm',
	define: replacements,
	entryPoints: [inputFile]
	});

	const minified = result.outputFiles[0].contents;
	console.log(new TextDecoder().decode(minified));

	const header = generateHeader(inputFile, minified);
	writeFileSync(outputFile, header);

	console.log(`snapshot generated successfully: ${outputFile}`);
	console.log(` bundled size: ${minified.length} bytes`);
	console.log(` replacements: ${Object.keys(replacements).length}`);
	}

	main().catch(err => {
	console.error(err);
	process.exit(1);
	});

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