feat(tools): redirect generation script (#49798)

* feat: redirect generation script

* feat: add comment

* Apply suggestions from code review

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

---------

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

tools/scripts/redirect-gen.ts

@@ -0,0 +1,36 @@
+import fs from 'fs';
+import path from 'path';
+
+/* This can be used to create NGINX maps for redirects. After running this
+   script with `npx ts-node redirect-gen`, the map should appear in the current
+   directory.
+*/
+
+function createRedirectMap(): void {
+  const basePath = '../../../curriculum/challenges/english/18-project-euler';
+  const directories = fs.readdirSync(path.resolve(__dirname, basePath));
+
+  let mapObject = '';
+
+  for (let i = 0; i < directories.length; i++) {
+    const files = fs.readdirSync(
+      path.resolve(__dirname, `${basePath}/${directories[i]}`)
+    );
+
+    for (let j = 0; j < files.length; j++) {
+      const fileName = path.parse(files[j]).name;
+      mapObject += `~^/learn/coding-interview-prep/project-euler/${fileName}/?$ /learn/project-euler/${directories[i]}/${fileName}; \n`;
+    }
+  }
+
+  fs.writeFile('redirectMap.map', mapObject, 'utf8', function (err) {
+    if (err) {
+      console.log('An error occurred while writing MAP redirect file', err);
+      return console.log(err);
+    }
+
+    console.log('Map file has been saved.');
+  });
+}
+
+createRedirectMap();