404 fallback logic to /reference and /articles

Author: Fernando-A-Rocha

web/public/_redirects

@@ -1,7 +1,3 @@
 /wiki        /
 /wiki/*      /:splat
 /Main_Page   /
-
-# Fallbacks
-/* /articles/:splat 200
-/* /reference/:splat 200

web/src/components/EnhancedMarkdown.astro

@@ -9,22 +9,21 @@ interface Props {
 const { content } = Astro.props;
 
 
-// We can't do this as we're now organizing pages in folders
-
-// function convertMediaWikiLinks(text: string): string {
-//   return text.replace(
-//     /\[\[([^|\]#]+)(?:#([^\]]+))?(?:\|([^\]]+))?\]\]/g,
-//     (_, link, hash, text) => {
-//       const url = `/${link}${hash ? `#${hash}` : ''}`;
-//       return `[${text || link}](${url})`;
-//     }
-//   );
-// }
-
-// const processedContent = convertMediaWikiLinks(content);
-// const tokens = marked.lexer(processedContent);
+// We shouldn't this as we're now organizing pages in folders
+// TODO let's move away from MediaWiki links in the future
+
+function convertMediaWikiLinks(text: string): string {
+  return text.replace(
+    /\[\[([^|\]#]+)(?:#([^\]]+))?(?:\|([^\]]+))?\]\]/g,
+    (_, link, hash, text) => {
+      const url = `/${link}${hash ? `#${hash}` : ''}`;
+      return `[${text || link}](${url})`;
+    }
+  );
+}
 
-const tokens = marked.lexer(content);
+const processedContent = convertMediaWikiLinks(content);
+const tokens = marked.lexer(processedContent);
 ---
 
 {

web/src/pages/404.astro

@@ -20,17 +20,39 @@ import { OLD_WIKI_URL, OLD_WIKI_REDIRECT } from '@src/content.constants';
     if (!OLD_WIKI_REDIRECT) {
         return;
     }
-    let countdown = 5;
-    const el = document.getElementById('countdown');
-    const interval = setInterval(() => {
-    countdown -= 1;
-    if (el) el.textContent = countdown;
-    if (countdown <= 0) {
-        clearInterval(interval);
+
+    async function tryFallbacks() {
         let path = location.pathname;
         // Remove trailing slash if any
         path = path.endsWith('/') ? path.slice(0, -1) : path;
-        window.location.replace(OLD_WIKI_URL + path);
+
+        const tryPath = async (prefix) => {
+            const testPath = `${prefix}${path}`;
+            try {
+                const res = await fetch(testPath, { method: 'HEAD' });
+                if (res.ok) {
+                    window.location.replace(testPath);
+                    return true;
+                }
+            } catch (_) {}
+            return false;
+        };
+
+        if (await tryPath('/reference')) return;
+        if (await tryPath('/articles')) return;
+
+        // Fallback to old wiki
+        let countdown = 5;
+        const el = document.getElementById('countdown');
+        const interval = setInterval(() => {
+            countdown -= 1;
+            if (el) el.textContent = countdown;
+            if (countdown <= 0) {
+                clearInterval(interval);
+                window.location.replace(OLD_WIKI_URL + path);
+            }
+        }, 1000);
     }
-    }, 1000);
+
+    tryFallbacks();
 </script>