# Statischer Markdown-Blog in SvelteKit - Implementierungsguide

## Übersicht: 3 Ansätze für statische Markdown-Blogs

### 1. **mdsvex** - Markdown als Svelte-Komponenten (Empfohlen)

### 2. **Vite Glob Import** - Dynamisches Laden zur Build-Zeit

### 3. **Content Collections** - Strukturierte Markdown-Verwaltung

---

## Ansatz 1: mdsvex (Empfohlen) ⭐

mdsvex verwandelt Markdown-Dateien in Svelte-Komponenten. Du kannst Svelte-Components direkt im Markdown verwenden!

### Installation & Setup

```bash
npm install -D mdsvex
npm install -D rehype-slug rehype-autolink-headings
```

### Konfiguration in `vite.config.js`

```javascript
import { sveltekit } from '@sveltejs/kit/vite';
import { defineConfig } from 'vite';

export default defineConfig({
	plugins: [sveltekit()],
});
```

### Konfiguration in `svelte.config.js`

```javascript
import adapter from '@sveltejs/adapter-node';
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';
import { mdsvex } from 'mdsvex';
import rehypeSlug from 'rehype-slug';
import rehypeAutolinkHeadings from 'rehype-autolink-headings';

/** @type {import('mdsvex').MdsvexOptions} */
const mdsvexOptions = {
	extensions: ['.md', '.mdx'],
	layout: {
		blog: './src/lib/layouts/BlogLayout.svelte',
	},
	rehypePlugins: [rehypeSlug, [rehypeAutolinkHeadings, { behavior: 'wrap' }]],
};

/** @type {import('@sveltejs/kit').Config} */
const config = {
	extensions: ['.svelte', '.md', '.mdx'],
	preprocess: [vitePreprocess(), mdsvex(mdsvexOptions)],
	kit: {
		adapter: adapter(),
	},
};

export default config;
```

### Blog-Layout erstellen

```svelte
<!-- src/lib/layouts/BlogLayout.svelte -->
<script>
	export let title = '';
	export let date = '';
	export let author = '';
	export let excerpt = '';
	export let tags = [];
	export let image = '';

	let formattedDate = $derived(
		new Date(date).toLocaleDateString('de-DE', {
			year: 'numeric',
			month: 'long',
			day: 'numeric',
		})
	);
</script>

<svelte:head>
	<title>{title} | uload Blog</title>
	<meta name="description" content={excerpt} />
	<meta property="og:title" content={title} />
	<meta property="og:description" content={excerpt} />
	{#if image}
		<meta property="og:image" content={image} />
	{/if}
</svelte:head>

<article class="prose prose-lg mx-auto px-4 py-8 max-w-4xl">
	<header class="mb-8">
		<h1 class="text-4xl font-bold mb-2">{title}</h1>
		<div class="text-gray-600 flex gap-4 items-center">
			<time datetime={date}>{formattedDate}</time>
			<span>•</span>
			<span>{author}</span>
		</div>
		{#if tags.length > 0}
			<div class="flex gap-2 mt-4">
				{#each tags as tag}
					<span class="bg-gray-100 px-3 py-1 rounded-full text-sm">
						{tag}
					</span>
				{/each}
			</div>
		{/if}
	</header>

	<div class="content">
		<slot />
	</div>
</article>
```

### Blog-Post Beispiel

```markdown
---
title: Die Psychologie kurzer URLs
date: 2024-01-15
author: Till Schneider
excerpt: Warum 42% weniger Menschen auf lange URLs klicken
tags: [Psychology, Marketing, URLs]
image: /blog/psychology-urls.jpg
---

# Die Psychologie kurzer URLs

42% weniger Klicks bei langen URLs – diese Zahl zeigt...

## Warum kurze URLs funktionieren

Unser Gehirn verarbeitet kurze Informationen schneller...

<script>
  import CallToAction from '$lib/components/CallToAction.svelte';
</script>

<CallToAction />
```

### Routing-Struktur

```
src/routes/
└── blog/
    ├── +page.svelte          # Blog-Übersicht
    ├── +page.js              # Posts laden
    └── [slug]/
        └── +page.js          # Dynamisches Routing
```

### Blog-Übersicht mit allen Posts

```javascript
// src/routes/blog/+page.js
export async function load() {
	const posts = import.meta.glob('/src/content/blog/*.md');
	const postPromises = Object.entries(posts).map(async ([path, resolver]) => {
		const { metadata } = await resolver();
		const slug = path.split('/').pop().replace('.md', '');

		return {
			slug,
			...metadata,
		};
	});

	const allPosts = await Promise.all(postPromises);

	// Nach Datum sortieren
	allPosts.sort((a, b) => new Date(b.date) - new Date(a.date));

	return {
		posts: allPosts,
	};
}
```

```svelte
<!-- src/routes/blog/+page.svelte -->
<script>
	let { data } = $props();
</script>

<div class="container mx-auto px-4 py-8">
	<h1 class="text-3xl font-bold mb-8">Blog</h1>

	<div class="grid gap-6 md:grid-cols-2 lg:grid-cols-3">
		{#each data.posts as post}
			<article class="border rounded-lg p-6 hover:shadow-lg transition">
				<h2 class="text-xl font-semibold mb-2">
					<a href="/blog/{post.slug}" class="hover:text-blue-600">
						{post.title}
					</a>
				</h2>
				<p class="text-gray-600 mb-4">{post.excerpt}</p>
				<div class="text-sm text-gray-500">
					{new Date(post.date).toLocaleDateString('de-DE')}
				</div>
			</article>
		{/each}
	</div>
</div>
```

---

## Ansatz 2: Vite Glob Import (Einfacher)

Dieser Ansatz lädt alle Markdown-Dateien zur Build-Zeit ohne mdsvex.

### Setup

```bash
npm install -D gray-matter marked
```

### Markdown-Parser Utility

```javascript
// src/lib/utils/markdown.js
import { marked } from 'marked';
import matter from 'gray-matter';

export function parseMarkdown(content) {
	const { data, content: markdown } = matter(content);
	const html = marked(markdown);

	return {
		metadata: data,
		html,
	};
}
```

### Posts laden

```javascript
// src/routes/blog/+page.server.js
import { parseMarkdown } from '$lib/utils/markdown';

export async function load() {
	const postFiles = import.meta.glob('/src/content/blog/*.md', {
		query: '?raw',
		import: 'default',
	});

	const posts = await Promise.all(
		Object.entries(postFiles).map(async ([path, resolver]) => {
			const content = await resolver();
			const { metadata, html } = parseMarkdown(content);
			const slug = path.split('/').pop().replace('.md', '');

			return {
				slug,
				...metadata,
				content: html,
			};
		})
	);

	return {
		posts: posts.sort((a, b) => new Date(b.date) - new Date(a.date)),
	};
}
```

### Einzelner Blog-Post

```javascript
// src/routes/blog/[slug]/+page.server.js
import { parseMarkdown } from '$lib/utils/markdown';
import { error } from '@sveltejs/kit';

export async function load({ params }) {
	try {
		const post = await import(`../../../content/blog/${params.slug}.md?raw`);
		const { metadata, html } = parseMarkdown(post.default);

		return {
			...metadata,
			content: html,
			slug: params.slug,
		};
	} catch (e) {
		throw error(404, 'Post nicht gefunden');
	}
}
```

```svelte
<!-- src/routes/blog/[slug]/+page.svelte -->
<script>
	let { data } = $props();
</script>

<svelte:head>
	<title>{data.title}</title>
	<meta name="description" content={data.excerpt} />
</svelte:head>

<article class="prose mx-auto px-4 py-8">
	<h1>{data.title}</h1>
	<time>{new Date(data.date).toLocaleDateString('de-DE')}</time>

	{@html data.content}
</article>
```

---

## Ansatz 3: Content Collections (Strukturiert)

Ein strukturierterer Ansatz mit Typ-Sicherheit und besserer Organisation.

### Content-Struktur

```
src/content/
├── blog/
│   ├── 2024-01-15-psychologie-urls.md
│   ├── 2024-01-20-link-tracking.md
│   └── _drafts/
│       └── upcoming-post.md
└── config.js
```

### Content-Config

```javascript
// src/content/config.js
import { z } from 'zod';

export const blogSchema = z.object({
	title: z.string(),
	date: z.date(),
	author: z.string(),
	excerpt: z.string(),
	tags: z.array(z.string()),
	image: z.string().optional(),
	draft: z.boolean().default(false),
});

export const collections = {
	blog: {
		schema: blogSchema,
		directory: 'src/content/blog',
	},
};
```

### Content-Loader

```javascript
// src/lib/content.js
import { blogSchema } from '../content/config';
import matter from 'gray-matter';
import { marked } from 'marked';

export async function getCollection(collection) {
	const posts = import.meta.glob('/src/content/blog/*.md', {
		query: '?raw',
		import: 'default',
	});

	const entries = await Promise.all(
		Object.entries(posts).map(async ([path, resolver]) => {
			// Drafts überspringen
			if (path.includes('_drafts')) return null;

			const content = await resolver();
			const { data, content: markdown } = matter(content);

			// Schema validieren
			const metadata = blogSchema.parse({
				...data,
				date: new Date(data.date),
			});

			// Draft-Posts in Production ausblenden
			if (metadata.draft && import.meta.env.PROD) return null;

			const slug = path.split('/').pop().replace('.md', '');
			const html = marked(markdown);

			return {
				slug,
				...metadata,
				content: html,
			};
		})
	);

	return entries.filter(Boolean);
}

export async function getEntry(collection, slug) {
	const posts = await getCollection(collection);
	return posts.find((post) => post.slug === slug);
}
```

---

## Features für alle Ansätze

### 1. RSS Feed Generation

```javascript
// src/routes/blog/rss.xml/+server.js
import { getCollection } from '$lib/content';

export async function GET() {
	const posts = await getCollection('blog');
	const site = 'https://ulo.ad';

	const xml = `<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0">
  <channel>
    <title>uload Blog</title>
    <link>${site}/blog</link>
    <description>Insights über URLs, Marketing und Psychologie</description>
    ${posts
			.map(
				(post) => `
    <item>
      <title>${post.title}</title>
      <link>${site}/blog/${post.slug}</link>
      <description>${post.excerpt}</description>
      <pubDate>${new Date(post.date).toUTCString()}</pubDate>
    </item>
    `
			)
			.join('')}
  </channel>
</rss>`;

	return new Response(xml, {
		headers: {
			'Content-Type': 'application/xml',
		},
	});
}
```

### 2. Sitemap Generation

```javascript
// src/routes/sitemap.xml/+server.js
export async function GET() {
	const posts = await getCollection('blog');
	const site = 'https://ulo.ad';

	const xml = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  ${posts
		.map(
			(post) => `
  <url>
    <loc>${site}/blog/${post.slug}</loc>
    <lastmod>${new Date(post.date).toISOString()}</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  `
		)
		.join('')}
</urlset>`;

	return new Response(xml, {
		headers: {
			'Content-Type': 'application/xml',
		},
	});
}
```

### 3. Syntax Highlighting

```bash
npm install -D shiki
```

```javascript
// src/lib/utils/highlight.js
import { codeToHtml } from 'shiki';

export async function highlightCode(code, lang = 'javascript') {
	return await codeToHtml(code, {
		lang,
		theme: 'github-dark',
	});
}
```

### 4. Reading Time

```javascript
// src/lib/utils/reading-time.js
export function calculateReadingTime(content) {
	const wordsPerMinute = 200;
	const words = content.split(/\s+/).length;
	const minutes = Math.ceil(words / wordsPerMinute);

	return {
		minutes,
		words,
		text: `${minutes} Min. Lesezeit`,
	};
}
```

### 5. Table of Contents

```javascript
// src/lib/utils/toc.js
export function extractHeadings(html) {
	const regex = /<h([2-3])[^>]*id="([^"]*)"[^>]*>(.*?)<\/h\1>/g;
	const headings = [];
	let match;

	while ((match = regex.exec(html)) !== null) {
		headings.push({
			level: parseInt(match[1]),
			id: match[2],
			text: match[3].replace(/<[^>]*>/g, ''),
		});
	}

	return headings;
}
```

---

## Performance-Optimierungen

### 1. Prerendering aktivieren

```javascript
// src/routes/blog/+page.js
export const prerender = true; // Statisch zur Build-Zeit generieren
```

### 2. Lazy Loading für Bilder

```svelte
<script>
	import { inview } from 'svelte-inview';

	let isInView = $state(false);
</script>

<div use:inview on:inview_enter={() => (isInView = true)}>
	{#if isInView}
		<img src={image} {alt} loading="lazy" />
	{:else}
		<div class="skeleton h-64 bg-gray-200" />
	{/if}
</div>
```

### 3. Content Caching

```javascript
// src/lib/cache.js
const cache = new Map();
const CACHE_DURATION = 1000 * 60 * 5; // 5 Minuten

export function getCached(key, fetcher) {
	const cached = cache.get(key);

	if (cached && Date.now() - cached.timestamp < CACHE_DURATION) {
		return cached.data;
	}

	const data = fetcher();
	cache.set(key, { data, timestamp: Date.now() });

	return data;
}
```

---

## Deployment-Tipps

### Build-Optimierungen

```javascript
// vite.config.js
export default defineConfig({
	build: {
		rollupOptions: {
			output: {
				manualChunks: {
					markdown: ['marked', 'gray-matter'],
					highlight: ['shiki'],
				},
			},
		},
	},
});
```

### Static Adapter für volle statische Generierung

```bash
npm install -D @sveltejs/adapter-static
```

```javascript
// svelte.config.js
import adapter from '@sveltejs/adapter-static';

export default {
	kit: {
		adapter: adapter({
			pages: 'build',
			assets: 'build',
			fallback: null,
			precompress: true,
		}),
		prerender: {
			entries: ['*'], // Alle Seiten prerendern
		},
	},
};
```

---

## Schnellstart-Anleitung

### 1. mdsvex installieren & konfigurieren

```bash
npm install -D mdsvex gray-matter rehype-slug rehype-autolink-headings
```

### 2. Blog-Struktur erstellen

```bash
mkdir -p src/content/blog
mkdir -p src/lib/layouts
mkdir -p src/routes/blog/\[slug\]
```

### 3. Ersten Post erstellen

```bash
cat > src/content/blog/hello-world.md << 'EOF'
---
title: Hello World
date: 2024-01-15
author: Till Schneider
excerpt: Mein erster Blog-Post
tags: [Announcement]
---

# Hello World

Dies ist mein erster Blog-Post mit Markdown!
EOF
```

### 4. Dev-Server starten

```bash
npm run dev
```

Besuche `http://localhost:5173/blog`

---

## Vorteile des statischen Ansatzes

✅ **Performance**: Zur Build-Zeit generiert = ultraschnell
✅ **SEO**: Vollständig gerenderte HTML-Seiten
✅ **Versionskontrolle**: Alle Posts in Git
✅ **Einfachheit**: Kein CMS, keine Datenbank
✅ **Sicherheit**: Keine dynamischen Vulnerabilities
✅ **Hosting**: Überall deploybar (Vercel, Netlify, etc.)

## Nachteile

❌ **Rebuild nötig**: Bei jedem neuen Post
❌ **Keine Kommentare**: Ohne externe Services
❌ **Kein WYSIWYG**: Markdown-Kenntnisse nötig
❌ **Keine Scheduled Posts**: Ohne CI/CD-Automation

---

**Empfehlung**: Starte mit **mdsvex** (Ansatz 1) - es bietet die beste Balance zwischen Einfachheit und Features, plus du kannst Svelte-Components direkt in Markdown verwenden!