Re-enable lastUpdated, add lastUpdated logic to API doc generator

docs/.vitepress/config.mts

@@ -10,6 +10,7 @@ import apiRoutes from '../api/index.json';
 import m3u8Grammar from './m3u8-grammar.json' with { type: 'json' };
 import fs from 'node:fs/promises';
 import path from 'node:path';
+import { execFileSync } from 'node:child_process';
 
 const DESCRIPTION = 'A JavaScript library for reading, writing, and converting media files. Directly in the browser,'
 	+ ' and faster than anybunny else.';
@@ -27,8 +28,14 @@ export default withMermaid({
 			for (const entry of entries) {
 				const isDirectory = await fs.stat(path.join('./examples', entry)).then(stat => stat.isDirectory());
 				if (isDirectory) {
+					const gitDate = execFileSync(
+						'git',
+						['log', '-1', '--format=%cI', '--', path.join('./examples', entry)],
+					).toString().trim();
+
 					items.push({
 						url: `/examples/${entry}/`, // With trailing slash
+						lastmod: new Date(gitDate).toISOString(),
 					});
 				}
 			}
@@ -36,7 +43,7 @@ export default withMermaid({
 			return items;
 		},
 	},
-	// lastUpdated: true,
+	lastUpdated: true,
 	head: [
 		['link', { rel: 'icon', type: 'image/png', href: '/mediabunny-logo.png' }],
 		['link', { rel: 'icon', type: 'image/svg+xml', href: '/mediabunny-logo.svg' }],
@@ -201,7 +208,7 @@ export default withMermaid({
 			tailwindcss() as any,
 			llmstxt({
 				ignoreFiles: [
-					'api/*',
+					'api/!(index).md',
 					'examples.md',
 					'llms.md',
 				],
@@ -305,5 +312,10 @@ export default withMermaid({
 		for (const file of files) {
 			await fs.copyFile('./docs/api/' + file, './dist-docs/api/' + file);
 		}
+
+		// The llms.txt generation leaves behind runs of empty lines, collapse them into one
+		const llmsTxtPath = './dist-docs/llms.txt';
+		const llmsTxt = await fs.readFile(llmsTxtPath, 'utf-8');
+		await fs.writeFile(llmsTxtPath, llmsTxt.replace(/\n{3,}/g, '\n\n'));
 	},
 });