Fixing Edit on GitHub Links (#627)

scripts/generate-github-routes.mjs

@@ -0,0 +1,42 @@
+#!/usr/bin/env node
+/**
+ * Generates src/lib/edit-on-github-routes.js by scanning src/pages for index.mdx.
+ * Used by Layout.jsx so "Edit on GitHub" links point to .../index.mdx for those routes.
+ * Run automatically with dev and build.
+ */
+
+import fs from 'fs'
+import path from 'path'
+import { fileURLToPath } from 'url'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+const ROOT = path.join(__dirname, '..')
+const PAGES_DIR = path.join(ROOT, 'src/pages')
+const OUT_PATH = path.join(ROOT, 'src/lib/edit-on-github-routes.js')
+
+function findIndexMdxRoutes(dir, basePath = '') {
+  const entries = fs.readdirSync(dir, { withFileTypes: true })
+  const routes = []
+  for (const e of entries) {
+    const rel = basePath ? `${basePath}/${e.name}` : e.name
+    if (e.isDirectory()) {
+      routes.push(...findIndexMdxRoutes(path.join(dir, e.name), rel))
+    } else if (e.name === 'index.mdx') {
+      routes.push('/' + basePath)
+    }
+  }
+  return routes
+}
+
+const routes = findIndexMdxRoutes(PAGES_DIR)
+  .filter((r) => r !== '') // ignore root index if any
+  .sort()
+
+const content = `// Auto-generated by scripts/generate-github-routes.mjs – do not edit
+/** Pathnames served by src/pages/.../index.mdx (Edit on GitHub must link to /index.mdx). */
+export const EDIT_ON_GITHUB_INDEX_ROUTES = new Set(${JSON.stringify(routes)});
+`
+
+fs.mkdirSync(path.dirname(OUT_PATH), { recursive: true })
+fs.writeFileSync(OUT_PATH, content, 'utf8')
+console.log('Generated', OUT_PATH, 'with', routes.length, 'index routes')