guidebook/src/routes/p/[...name].js

import { getPost, getPostsFlat, isDir } from "$lib/pages";

export async function get({ params }) {
  let dir = await isDir(params.name);
  if (dir === null) {
    return {status: 404};
  } else if (dir) {
    return {
      body: {
        pages: await getPostsFlat(params.name)
      }
    }
  } else {
    let pages = [];

    let split = params.name.split('/');
    if (split.length > 1) {
      pages = await getPostsFlat(split[split.length - 2]);
    }

    let post = await getPost(params.name);

    pages = pages.filter(l => l.path !== post.path);

    return {
      body: {
        page: post,
        pages: pages
      }
    }
  }
}