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97 lines
3.2 KiB
97 lines
3.2 KiB
/*
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* Implements a simple markdown blog loader that's used primarily in the
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* `rendered/pages/blog` example. It supports generating an RSS/Atom/JSON
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* feed of pages, loading an index of .md pages, and render markdown with
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* the headers. It uses the `lib/docgen.js:render_with_code` to do the
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* main markdown processing.
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*/
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import path from "path";
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import glob from "fast-glob";
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import assert from "assert";
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import { render_with_code } from "./docgen.js";
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import fs from "fs";
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import { Feed } from "feed";
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// have to use the client config to avoid pino crashing rollup with json errors
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import { base_host } from "../client/config.js";
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// caches the posts so we don't load them repeatedly during runs
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const POSTS = {};
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// this keeps POSTS alive, for some reason it disappears during processing
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process.POSTS = POSTS;
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/*
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Takes a directory of `.md` files and returns all of them rendered
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to HTML+Metadata using `lib/docgen.js:render_with_code`.
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+ `source string` -- Source directory to read.
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*/
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export const load = (source) => {
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assert(source !== undefined, "source for markdown processing can't be undefined");
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// just a dumb cache to avoid reading the files over and over
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// cache only works if load isn't async!
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let cache = POSTS[source];
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if(cache === undefined) {
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cache = []; // this is fresh so make a new one
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let source_path = path.join(process.cwd(), "..", source);
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let posts_regex = path.join(source_path, "*.md");
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assert(!posts_regex.includes("//"), `You have a // in your path which fast-glob hates: ${posts_regex}`);
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const files = glob.sync(posts_regex.replace(/\\/g, "/"));
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for(let post of files.reverse()) {
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try {
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const {content, toc, metadata} = render_with_code(source_path, post);
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assert(content && toc && metadata, `Rendering ${source} failed.`);
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// so many Svelte builders (like 7ty) need slug that we should do it here
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cache.push({content, toc, metadata, slug: metadata.slug});
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} catch(error) {
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console.error(error, `Failure processing post: ${post}`);
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}
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}
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POSTS[source] = cache;
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return cache;
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} else {
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return cache;
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}
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}
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/*
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Renders the `/public/feed.rss`, `/public/feed.atom`, and `/public/feed.json` files
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based on the `index_config` and posts from `load`. The `index_config` is a `.json`
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file that describes the blog. The current configuration can be
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found in `renderd/feed_config.json`.
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+ `index_config string` -- The path to the `feed_config.json` file.
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+ `posts Array` -- List of posts.
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*/
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export const render_feed = (index_config, posts) => {
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const index = JSON.parse(fs.readFileSync(index_config));
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const feed = new Feed(index);
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index.updated = new Date();
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for(let post of posts) {
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post.metadata.url = `${base_host}/blog/${post.slug}/`;
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feed.addItem({
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title: post.metadata.title,
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id: post.metadata.url,
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link: post.metadata.url,
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date: new Date(post.metadata.date),
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description: post.metadata.summary,
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content: post.content,
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author: index.author
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});
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}
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fs.writeFileSync('../public/feed.rss', feed.rss2());
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fs.writeFileSync('../public/feed.json', feed.json1());
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fs.writeFileSync('../public/feed.atom', feed.atom1());
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}
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export default { load, render_feed };
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