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()
  17       .split('\n')[0]
  18       .replace('#', '')
  19       .replace(/&/g, '&amp;')
  20       .trim();
  21   }
  22 };
  23
  24 /**
  25  * Generates an RSS feed XML file
  26  *
  27  * @name RSSGenerator
  28  * @param {string} source the source directory
  29  * @param {string} target the target directory
  30  * @param {Array.<Blog.tPost>} posts the list of posts
  31  */
  32 module.exports = async function RSSGenerator(source, target, posts) {
  33
  34   internals.debuglog('Generating RSS');
  35   const feedTarget = join(target, internals.kFeedName);
  36   const feedLocation = join(source, internals.kFeedName);
  37
  38   internals.debuglog(`Reading ${feedLocation}`);
  39   const feedTemplate = await readFile(feedLocation, { encoding: 'utf8' });
  40
  41   internals.debuglog('Writing RSS');
  42   posts = posts.map((post) => ({
  43     ...post,
  44     createdOn: (new Date(post.createdOn)).toUTCString(),
  45     title: internals.extractTitle(post.raw),
  46     html: encodeXML(post.html)
  47   }));
  48   const feedXml = template(feedTemplate, {
  49     ...templateSettings,
  50     strip: false
  51   })({ posts });
  52   await writeFile(feedTarget, feedXml);
  53 };