RSS templating with Chalk

entry.dart

class Entry {
  String title; // My Blog Post
  String url; // http://example.com/posts/my-blog-post
  String tag; // tag:example.com,2015-11-14:/posts/my-blog-post (http://web.archive.org/web/20110514113830/http://diveintomark.org/archives/2004/05/28/howto-atom-id)
  DateTime updatedAt; // 2015-11-14
  String summary; // A post about an important issue that needs discussing
}

main.dart

import 'package:shelf/shelf.dart' as shelf;

routes(Router router) {
  router.get('/feed', () async {
    final List<Entry> entries = someMethodOfFetchingAllEntries();
    
    final rssTemplate = await (template('rss')
      ..title = 'My RSS Feed'
      ..subtitle = 'An important RSS feed about stuff that matters'
      ..url = 'http://example.com/feed'
      ..author = 'John Doe'
      ..tag = 'feed:example.com,2015:/feed' // http://web.archive.org/web/20110514113830/http://diveintomark.org/archives/2004/05/28/howto-atom-id
      ..entries = entries);
      
    return new shelf.Response.ok(rssTemplate.encoded, headers: {
      'Content-Type': 'application/atom+xml; charset=UTF-8'
    });
  });
}

rss.chalk.html

<?xml version="1.0" encoding="utf-8"?>

<feed xmlns="http://www.w3.org/2005/Atom">
  <title>$title</title>
  <subtitle>$subtitle</subtitle>
  <link href="$url" rel="self" />
  <updated>${entries.last.updatedAt}</updated>
  <author>
      <name>$author</name>
  </author>
  <id>$tag</id>
  @for (entry in entries.reversed)
    <entry>
      <title>${entry.title}</title>
      <link href="${entry.url}"/>
      <id>${entry.tag}</id>
      <updated>${entry.updatedAt}</updated>
      <summary>${entry.summary}</summary>
    </entry>
  @end for
</feed>