// Helper for displaying edit changes so they can be manually verified

import {execSync} from 'node:child_process';

/**
 * Converts a string from UTF-8 to base64.
 * @param {string} str
 * @returns {string}
 */
const toBase64 = str => Buffer.from(str, 'utf-8').toString('base64');

/**
 * terrible terrible terrible string diff helper for debugging
 * @param {string} a
 * @param {string} b
 */
export function diff (a, b) {
	// base64 input strings before passing to shell to avoid escaping issues
	// https://stackoverflow.com/a/60221847
	// use tail to cut off useless file info lines
	execSync(String.raw`bash <<- EOF
		diff --color=always -u \
			<(echo "${toBase64(a)}" | base64 -d) \
			<(echo "${toBase64(b)}" | base64 -d) \
		| tail -n +3
	EOF`, {
		// display result directly in terminal
		stdio: 'inherit',
	});
}