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

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