git.r.bdr.sh - rbdr/blog/blob - lib/generators/rss.js

   1 import Dot from 'dot';
   2 import { encodeXML } from 'entities';
   3 import { readFile, writeFile } from 'fs/promises';
   4 import { join } from 'path';
   5 import { debuglog } from 'util';
   6
   7 const internals = {
   8   debuglog: debuglog('blog'),
   9
  10   kFeedName: 'feed.xml',
  11
  12   extractTitle(postText) {
  13
  14     return postText.trim()
  15       .split('\n')[0]
  16       .replace('#', '')
  17       .replace(/&/g, '&amp;')
  18       .trim();
  19   }
  20 };
  21
  22 /**
  23  * Generates an RSS feed XML file
  24  *
  25  * @name RSSGenerator
  26  * @param {string} source the source directory
  27  * @param {string} target the target directory
  28  * @param {Array.<Blog.tPost>} posts the list of posts
  29  */
  30 export default async function RSSGenerator(source, target, posts) {
  31
  32   internals.debuglog('Generating RSS');
  33   const feedTarget = join(target, internals.kFeedName);
  34   const feedLocation = join(source, internals.kFeedName);
  35
  36   internals.debuglog(`Reading ${feedLocation}`);
  37   const feedTemplate = await readFile(feedLocation, { encoding: 'utf8' });
  38
  39   internals.debuglog('Writing RSS');
  40   posts = posts.map((post) => ({
  41     ...post,
  42     createdOn: (new Date(post.createdOn)).toUTCString(),
  43     title: internals.extractTitle(post.raw),
  44     html: encodeXML(post.html)
  45   }));
  46   const feedXml = Dot.template(feedTemplate, {
  47     ...Dot.templateSettings,
  48     strip: false
  49   })({ posts });
  50   await writeFile(feedTarget, feedXml);
  51 }