add link_renderer to handle external links

site/src/routes/blog/_posts.js

@@ -1,6 +1,6 @@
 import fs from 'fs';
 import path from 'path';
-import { extract_frontmatter, langs } from '../../utils/markdown.js';
+import { extract_frontmatter, langs, link_renderer } from '../../utils/markdown.js';
 import marked from 'marked';
 import PrismJS from 'prismjs';
 import 'prismjs/components/prism-bash';
@@ -20,6 +20,8 @@ export default function() {
 
 			const renderer = new marked.Renderer();
 
+			renderer.link = link_renderer;
+
 			renderer.code = (source, lang) => {
 				const plang = langs[lang];
 				const highlighted = PrismJS.highlight(

site/src/routes/docs/_sections.js

@@ -1,6 +1,6 @@
 import fs from 'fs';
 import path from 'path';
-import { extract_frontmatter, extract_metadata, langs } from '../../utils/markdown.js';
+import { extract_frontmatter, extract_metadata, langs, link_renderer } from '../../utils/markdown.js';
 import marked from 'marked';
 import PrismJS from 'prismjs';
 import 'prismjs/components/prism-bash';
@@ -50,6 +50,8 @@ export default function() {
 
 			let block_open = false;
 
+			renderer.link = link_renderer;
+
 			renderer.hr = (...args) => {
 				block_open = true;
 

site/src/routes/tutorial/[slug]/index.json.js

@@ -2,7 +2,7 @@ import * as fs from 'fs';
 import * as path from 'path';
 import marked from 'marked';
 import PrismJS from 'prismjs';
-import { extract_frontmatter, extract_metadata, langs } from '../../../utils/markdown';
+import { extract_frontmatter, extract_metadata, langs, link_renderer } from '../../../utils/markdown';
 
 const cache = new Map();
 
@@ -33,6 +33,8 @@ function get_tutorial(slug) {
 
 	const renderer = new marked.Renderer();
 
+	renderer.link = link_renderer;
+
 	renderer.code = (source, lang) => {
 		source = source.replace(/^ +/gm, match =>
 			match.split('    ').join('\t')

site/src/utils/markdown.js

@@ -42,3 +42,20 @@ export const langs = {
 	js: 'javascript',
 	css: 'css'
 };
+
+
+// links renderer
+export function link_renderer(href,title,text) {
+	let target_attr = '';
+	let title_attr = '';
+	
+	if(href.startsWith("http")) {
+		target_attr = ' target="_blank"';
+	}
+
+	if(title !== null) {
+		title_attr = ` title="${title}"`;
+	}
+	
+	return `<a href="${href}"${target_attr}${title_attr}>${text}</a>`;
+};