fix(tui): rewrite relative README links to GitHub URLs on landing site (#25)

Author: junhoyeo

packages/landing/src/pages/index.astro

@@ -14,14 +14,33 @@ const __dirname = dirname(__filename);
 const readmePath = join(__dirname, '../../../../README.md');
 const readmeContent = readFileSync(readmePath, 'utf-8');
 
+const GITHUB_BLOB =
+  'https://github.com/junhoyeo/contrabass/blob/main/';
+const GITHUB_TREE =
+  'https://github.com/junhoyeo/contrabass/tree/main/';
+
+function isRelative(href: string): boolean {
+  return !!href && !href.startsWith('http') && !href.startsWith('#') && !href.startsWith('mailto:');
+}
+
 const parser = new Marked(
   markedHighlight({
     langPrefix: 'hljs language-',
     highlight(code, lang) {
       const language = lang && hljs.getLanguage(lang) ? lang : 'plaintext';
       return hljs.highlight(code, { language }).value;
     },
-  })
+  }),
+  {
+    walkTokens(token) {
+      if (token.type === 'link' && isRelative(token.href)) {
+        token.href = (token.href.endsWith('/') ? GITHUB_TREE : GITHUB_BLOB) + token.href;
+      }
+      if (token.type === 'image' && isRelative(token.href)) {
+        token.href = GITHUB_BLOB + token.href;
+      }
+    },
+  },
 );
 
 const htmlContent = parser.parse(readmeContent);