Merge remote-tracking branch 'upstream/main'

src/content-script/index.mjs

@@ -1,15 +1,15 @@
 import './styles.css'
 import 'github-markdown-css'
 import './katex.less'
-import MarkdownIt from 'markdown-it'
 import MarkdownItTexmath from "markdown-it-texmath";
 import Katex from "katex"
 import Browser from 'webextension-polyfill'
+import { getMarkdownRenderer } from './markdown.mjs'
 import { config } from './search-engine-configs.mjs'
 import { getPossibleElementByQuerySelector } from './utils.mjs'
 
 async function run(question, siteConfig) {
-  const markdown = new MarkdownIt().use(MarkdownItTexmath, {
+  const markdown = getMarkdownRenderer().use(MarkdownItTexmath, {
     engine: Katex,
     delimiters: 'dollars',
     katexOptions: { macros: { "\\RR": "\\mathbb{R}" }, throwOnError: false }

src/content-script/markdown.mjs

@@ -0,0 +1,32 @@
+import MarkdownIt from 'markdown-it'
+
+export function getMarkdownRenderer() {
+  const markdown = new MarkdownIt({
+    linkify: true,
+  })
+
+  // source: https://github.com/markdown-it/markdown-it/blob/master/docs/architecture.md#renderer
+
+  // Remember old renderer, if overridden, or proxy to default renderer
+  const defaultRender =
+    markdown.renderer.rules.link_open ||
+    function (tokens, idx, options, env, self) {
+      return self.renderToken(tokens, idx, options)
+    }
+
+  markdown.renderer.rules.link_open = function (tokens, idx, options, env, self) {
+    // If you are sure other plugins can't add `target` - drop check below
+    const aIndex = tokens[idx].attrIndex('target')
+
+    if (aIndex < 0) {
+      tokens[idx].attrPush(['target', '_blank']) // add new attribute
+    } else {
+      tokens[idx].attrs[aIndex][1] = '_blank' // replace value of existing attr
+    }
+
+    // pass token to default renderer.
+    return defaultRender(tokens, idx, options, env, self)
+  }
+
+  return markdown
+}