add sitemap.xml and feed.xml

sitemap depends on internal sapper realization, which is bad, but works till we need to add another langs

src/routes/feed.xml.js

@@ -0,0 +1,27 @@
+import posts from './blog/_posts.js';
+
+const sortedPosts = posts.sort( (a, b) => {return new Date(a.data.date.split('.').reverse().toString())<new Date(b.data.date.split('.').reverse().toString())? 1 : -1} )
+const render = (posts) => `<?xml version="1.0" encoding="UTF-8" ?>
+<rss version="2.0">
+<channel>
+	<title>mailcheck.co</title>
+  <link>https://www.mailcheck.co/blog</link>
+	<description>Posts from Mailcheck.co</description>
+	${posts.map(post => `
+		<item>
+			<title>${post.data.title}</title>
+			<link>https://www.mailcheck.co/blog/${post.data.slug}</link>
+            <description><![CDATA[${post.data.snippet}]]></description>
+			<pubDate>${new Date(post.data.date.split('.').reverse().toString()).toISOString()}</pubDate>
+		</item>
+	`).join('')}
+</channel>
+</rss>`;
+
+export function get(req, res, next) {
+
+    res.setHeader('Cache-Control', `max-age=0, s-max-age=${600}`); // 10 minutes
+    res.setHeader('Content-Type', 'application/rss+xml');
+    const feed = render(sortedPosts);
+    res.end(feed);
+}

src/routes/index.svelte

@@ -1,3 +1,11 @@
+<script context="module">
+    export function preload({ params, query }) {
+        return this.fetch(`feed.xml`).then(() => {
+            return this.fetch('sitemap.xml')
+        });
+    }
+</script>
+
 <script lang="typescript">
     import Seo from "../components/seo.svelte"
     import EmailsVerify from "../components/EmailsVerify.svelte";

src/routes/sitemap.xml.js

@@ -0,0 +1,34 @@
+import {routes} from '@sapper/internal/manifest-client.mjs';
+
+const render = (pages, categories, posts) => `<?xml version="1.0" encoding="UTF-8" ?>
+        <urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
+        ${pages.map(page => `
+        <url><loc>https://www.mailcheck.co/${page}</loc></url>
+        `).join('')}
+        ${categories.map(cat => `
+        <url><loc>https://www.mailcheck.co/blog/c/${cat}/</loc></url>
+        `).join('')}
+        ${posts.map(post => `
+        <url><loc>https://www.mailcheck.co/${post}/</loc></url>
+        `).join('')}
+        </urlset>
+        `;
+
+export function get(req, res, next) {
+
+    res.setHeader('Cache-Control', `max-age=0, s-max-age=${600}`); // 10 minutes
+    res.setHeader('Content-Type', 'application/rss+xml');
+
+    let data = []
+    routes.forEach(el => {
+        data.push( el.pattern.source.toString().replace(/\\/g, '').split('/').filter(el => /[a-zA-Z-]/.exec(el)).join('/'))
+    })
+    data = [...new Set(data)]
+
+    const pages = data.filter(url=>url.search('/')===-1);
+    const posts = data.filter(url=>url.search('/')>0);
+
+
+    const feed = render(pages, [], posts);
+    res.end(feed);
+}