Add page meta tags for search and link previews

src/lib/components/ui/PageHeader.svelte

@@ -1,19 +1,30 @@
 <script lang="ts">
 	import type { Snippet } from 'svelte';
+	import { page } from '$app/state';
 	import { profile } from '#lib/content';
+	import { findSitePage } from '#lib/site/pages';
+	import PageMeta, { type PageMetaOptions } from './PageMeta.svelte';
 
-	let { command, title, subtitle, children }: { command: string; title?: string; subtitle?: string; children?: Snippet } =
-		$props();
+	let {
+		command,
+		title,
+		subtitle,
+		description,
+		meta,
+		children
+	}: {
+		command: string;
+		title?: string;
+		subtitle?: string;
+		description?: string;
+		meta?: PageMetaOptions;
+		children?: Snippet;
+	} = $props();
+
+	const metaDescription = $derived(description ?? subtitle ?? findSitePage(page.url.pathname)?.description);
 </script>
 
-<svelte:head>
-	{#if title}
-		<title>{title} | {profile.displayName}</title>
-	{/if}
-	{#if subtitle}
-		<meta name="description" content={subtitle} />
-	{/if}
-</svelte:head>
+<PageMeta {title} description={metaDescription} {...meta} />
 
 <header class="page-header">
 	<div class="command">

src/lib/components/ui/PageMeta.svelte

@@ -0,0 +1,62 @@
+<script lang="ts" module>
+	export type PageMetaOptions = {
+		image?: string;
+		type?: 'website' | 'article' | 'profile';
+		publishedTime?: string;
+		tags?: string[];
+		noIndex?: boolean;
+	};
+</script>
+
+<script lang="ts">
+	import { page } from '$app/state';
+	import { profile } from '#lib/content';
+
+	let {
+		title,
+		description,
+		image,
+		type = 'website',
+		publishedTime,
+		tags = [],
+		noIndex = false
+	}: PageMetaOptions & { title?: string; description?: string } = $props();
+
+	const fullTitle = $derived(title ? `${title} | ${profile.displayName}` : `${profile.displayName} | Portfolio`);
+	const fullDescription = $derived(description ?? `${profile.title} - ${profile.bio}`);
+	const pageUrl = $derived(`${page.url.origin}${page.url.pathname}`);
+	const imageUrl = $derived(new URL(image ?? profile.photo ?? profile.avatar, page.url.origin).href);
+</script>
+
+<svelte:head>
+	<title>{fullTitle}</title>
+	<meta name="description" content={fullDescription} />
+	<link rel="canonical" href={pageUrl} />
+	{#if noIndex}
+		<meta name="robots" content="noindex" />
+	{/if}
+
+	<meta property="og:site_name" content="{profile.displayName}'s Desktop" />
+	<meta property="og:title" content={fullTitle} />
+	<meta property="og:description" content={fullDescription} />
+	<meta property="og:url" content={pageUrl} />
+	<meta property="og:type" content={type} />
+	<meta property="og:image" content={imageUrl} />
+	<meta property="og:image:alt" content={profile.displayName} />
+
+	{#if type === 'article' && publishedTime}
+		<meta property="article:published_time" content={publishedTime} />
+		<meta property="article:author" content={profile.name} />
+		{#each tags as tag (tag)}
+			<meta property="article:tag" content={tag} />
+		{/each}
+	{/if}
+	{#if type === 'profile'}
+		<meta property="profile:username" content={profile.username} />
+	{/if}
+
+	<meta name="twitter:card" content="summary" />
+	<meta name="twitter:title" content={fullTitle} />
+	<meta name="twitter:description" content={fullDescription} />
+	<meta name="twitter:image" content={imageUrl} />
+</svelte:head>

src/routes/+error.svelte

@@ -39,7 +39,7 @@
 </script>
 
 <div class="page">
-	<PageHeader command="curl {page.url.pathname}" title="Error {status}" />
+	<PageHeader command="curl {page.url.pathname}" title="Error {status}" meta={{ noIndex: true }} />
 
 	<pre class="ascii" class:server-error={status >= 500}>{asciiDigits.join('\n')}</pre>
 

src/routes/+layout.svelte

@@ -38,6 +38,8 @@
 	{@html themeStyleTag}
 	<link rel="icon" href="/favicon.png" />
 	<meta name="author" content={profile.displayName} />
+	<link rel="apple-touch-icon" href="/favicon.png" />
+	<link rel="alternate" type="application/rss+xml" title="{profile.displayName}'s Blog" href="/blog/rss.xml" />
 </svelte:head>
 
 <svelte:window onkeydown={(event) => handleKeybind(event, openWindowIds)} />

src/routes/+page.svelte

@@ -1,8 +1,5 @@
 <script lang="ts">
-	import { profile } from '#lib/content';
+	import PageMeta from '#lib/components/ui/PageMeta.svelte';
 </script>
 
-<svelte:head>
-	<title>{profile.displayName} | Portfolio</title>
-	<meta name="description" content="{profile.title} - {profile.bio}" />
-</svelte:head>
+<PageMeta type="profile" />

src/routes/blog/[slug]/+page.svelte

@@ -9,7 +9,12 @@
 
 <div class="page">
 	<article class="article">
-		<PageHeader command="cat ~/blog/{data.post.slug}.md" title={data.post.title} subtitle={data.post.excerpt} />
+		<PageHeader
+			command="cat ~/blog/{data.post.slug}.md"
+			title={data.post.title}
+			subtitle={data.post.excerpt}
+			meta={{ type: 'article', publishedTime: data.post.date, tags: data.post.tags }}
+		/>
 
 		<div class="meta">
 			<a href="/blog">&lt; back to blog</a>