beeeeg update

src/lib/seo.ts

@@ -0,0 +1,118 @@
+import { formatTitle, getTitle, type SiteEnvironment } from './title';
+
+export const SITE_ORIGIN = 'https://stanrunge.dev';
+
+type Article = {
+	title: string;
+	content: string;
+	updatedAt: Date | string;
+};
+type List = { name: string; isProgress: boolean; items: { name: string }[] };
+type Race = { short: string; distance: number; discipline: string };
+type PageContent = { blogArticle?: Article; list?: List; race?: Race };
+
+type Seo = {
+	title: string;
+	description: string;
+	url: string;
+	indexable: boolean;
+	type: 'website' | 'article';
+	image: string;
+	imageAlt: string;
+	modifiedAt?: string;
+};
+
+const publicPages: Record<string, { title: string; description: string }> = {
+	'/': {
+		title: 'Projects, lists and writing',
+		description: 'Stan Runge’s projects, lists, writing and experience.'
+	},
+	'/projects': {
+		title: 'Projects',
+		description: 'Software projects by Stan Runge, including Catchemall, Animaldex and Derby Lens.'
+	},
+	'/blog': { title: 'Blog', description: 'Articles and notes by Stan Runge.' },
+	'/lists': { title: 'Lists', description: 'Lists collected and maintained by Stan Runge.' },
+	'/projects/catch-em-all': {
+		title: 'Catchemall',
+		description: 'Track which Pokémon you have caught across 53 games and 1,025 Pokémon.'
+	},
+	'/projects/animaldex': {
+		title: 'Animaldex',
+		description: 'Find and add neighborhood animals on a map.'
+	},
+	'/projects/derby': {
+		title: 'Derby Lens',
+		description: 'Estimate horse racing odds and compare them with market prices.'
+	},
+	'/projects/spotify-beatmap-finder': {
+		title: 'osu! map finder',
+		description: 'Find osu! beatmaps for Spotify songs, albums and playlists.'
+	}
+};
+
+function excerpt(markdown: string): string {
+	return markdown
+		.replace(/!\[[^\]]*\]\([^)]*\)/g, '')
+		.replace(/\[([^\]]+)\]\([^)]*\)/g, '$1')
+		.replace(/<[^>]*>/g, ' ')
+		.replace(/[`*_>#~|]/g, ' ')
+		.replace(/\s+/g, ' ')
+		.trim()
+		.slice(0, 160);
+}
+
+function date(value: Date | string): string | undefined {
+	const parsed = new Date(value);
+	return Number.isNaN(parsed.getTime()) ? undefined : parsed.toISOString();
+}
+
+export function getSeo(
+	pathname: string,
+	content: PageContent = {},
+	environment: SiteEnvironment = null
+): Seo {
+	const path = pathname.replace(/\/$/, '') || '/';
+	const url = new URL(path, SITE_ORIGIN).href;
+	let page = publicPages[path];
+	let type: Seo['type'] = 'website';
+	let modifiedAt: string | undefined;
+
+	if (/^\/blog\/[^/]+$/.test(path) && content.blogArticle) {
+		const article = content.blogArticle;
+		page = {
+			title: article.title,
+			description: excerpt(article.content) || `Read ${article.title} by Stan Runge.`
+		};
+		type = 'article';
+		modifiedAt = date(article.updatedAt);
+	} else if (/^\/blog\/[^/]+\/edit$/.test(path) && content.blogArticle) {
+		page = { title: `Editing ${content.blogArticle.title}`, description: 'Edit a blog article.' };
+	} else if (/^\/lists\/[^/]+$/.test(path) && content.list) {
+		const list = content.list;
+		const names = list.items.slice(0, 3).map((item) => item.name);
+		page = {
+			title: list.name,
+			description: names.length
+				? `${list.name}: ${names.join(', ')}${list.items.length > names.length ? ', and more' : ''}.`
+				: `${list.name}, a ${list.isProgress ? 'progress ' : ''}list by Stan Runge.`
+		};
+	} else if (/^\/projects\/derby\/[^/]+$/.test(path) && content.race) {
+		const race = content.race;
+		page = {
+			title: `${race.short} · Derby Lens`,
+			description: `Estimate odds for the ${race.short}, a ${race.distance} m ${race.discipline} race.`
+		};
+	}
+
+	return {
+		title: page ? formatTitle(page.title, environment) : getTitle(path, environment),
+		description: page?.description ?? 'Stan Runge’s personal website.',
+		url,
+		indexable: !!page && !environment && !/^\/blog\/[^/]+\/edit$/.test(path),
+		type,
+		image: `${SITE_ORIGIN}/moon.jpg`,
+		imageAlt: 'Moon icon for Stan Runge’s website',
+		modifiedAt
+	};
+}