redirect_from solution

.config/astro.config.mjs

@@ -2,6 +2,7 @@ import { defineConfig } from 'astro/config'
 import remarkLeadParagraph from './src/lib/remark-lead-paragraph.mjs'
 import remarkToc from './src/lib/remark-toc.mjs'
 import react from '@astrojs/react'
+import redirects from './redirects.json'
 
 // https://astro.build/config
 /** @type {import('astro/config').AstroUserConfig} */
@@ -17,6 +18,7 @@ export default defineConfig({
       wrap: true
     }
   },
+  redirects,
   vite: {
     resolve: {
       // for making content -> src/content symlink work

.gitignore

@@ -14,4 +14,5 @@ src/images/icons/
 .astro/
 
 # autogenerated stuff
-public/get/
+public/get/
+.config/redirects.json

package.json

@@ -7,7 +7,7 @@
   "license": "MIT",
   "type": "module",
   "scripts": {
-    "prebuild": "npm run create:icons && npm run move:downloads",
+    "prebuild": "npm run create:icons && npm run create:redirects && npm run move:downloads",
     "start": "npm run prebuild && astro dev --config .config/astro.config.mjs",
     "build": "npm run prebuild && astro build --config .config/astro.config.mjs",
     "preview": "astro preview",

scripts/redirect-from.ts

@@ -0,0 +1,74 @@
+//
+// astro-redirect-from
+//
+import fs from 'node:fs/promises'
+import path from 'node:path'
+import frontmatter from 'front-matter'
+import ora from 'ora'
+
+const contentDir = 'content/'
+const outputFilePath = '.config/redirects.json'
+let fileCount = 0
+
+type Frontmatter = { redirect_from?: string[]; slug?: string }
+
+const spinner = ora('Extract redirects').start()
+
+async function findMarkdownFilesWithRedirects(
+  dir: string
+): Promise<{ [old: string]: string }> {
+  const redirects: { [old: string]: string } = {}
+
+  async function processDir(currentDir: string) {
+    const items = await fs.readdir(currentDir, { recursive: true })
+
+    for (const item of items) {
+      const itemPath = path.join(currentDir, item)
+      const stats = await fs.stat(itemPath)
+
+      if (
+        stats.isFile() &&
+        item.endsWith('.md') &&
+        !itemPath.includes('links')
+      ) {
+        const fileContent = await fs.readFile(itemPath, 'utf-8')
+        const { attributes }: { attributes: Frontmatter } =
+          frontmatter(fileContent)
+
+        // construct slug from frontmatter or folder name
+        const postSlug =
+          attributes.slug ||
+          itemPath.split('2')[1].split('/index.md')[0].substring(10)
+
+        // Check if the Markdown file has a redirect_from field
+        if (attributes.redirect_from) {
+          fileCount++
+          const redirectFromSlugs = attributes.redirect_from
+          for (const slug of redirectFromSlugs) {
+            // Add entries to the redirects object
+            redirects[slug] = postSlug
+          }
+        }
+      }
+    }
+  }
+
+  await processDir(dir)
+  return redirects
+}
+
+try {
+  const redirects = await findMarkdownFilesWithRedirects(contentDir)
+  const redirectsJSON = JSON.stringify(redirects, null, 2)
+
+  // Write the redirects object to the output file
+  fs.writeFile(outputFilePath, redirectsJSON, 'utf-8')
+
+  spinner.succeed(
+    `Extracted ${
+      Object.keys(redirects).length
+    } redirects from ${fileCount} files`
+  )
+} catch (error: any) {
+  spinner.fail((error as Error).message)
+}