Atom template authors

[heitorPB]

IMPORTANT: Please do not create a Pull Request adding a new feature without discussing it first.

The place to discuss new features is the forum: https://zola.discourse.group/
If you want to add a new feature, please open a thread there first in the feature requests section.

Sanity check:

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Code changes

(Delete or ignore this section for documentation changes)

• Are you doing the PR on the next branch?

If the change is a new feature or adding to/changing an existing one:

• Have you created/updated the relevant documentation page(s)?

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Atom 1.0 [0] support multiple <author> entries in the feed. This commit modified the template to generate as many <author> as the page's metadata contains.

Forum post: https://zola.discourse.group/t/why-the-default-feed-templates-only-use-the-first-author/1738

[0] https://validator.w3.org/feed/docs/atom.html#recommendedEntryElements

[heitorPB]

Ouch, I started the code from the master branch, will rebase on top of next.

[Keats]

Can you add some tests?

[heitorPB]

I can :)
Could you guide me on where is the most appropriate place for that?

[Keats]

This file https://github.com/getzola/zola/blob/master/components/site/tests/site.rs is a giant integration test loading this site https://github.com/getzola/zola/tree/master/test_site
In one of the existing pages, add multiple authors and check that the authors are present in the atom file

[heitorPB]

Thanks!

That's a very neat test suite.

I extended the Rust post to have 3 authors, here's its Atom section:

    <entry xml:lang="en">
        <title>Rust</title>
        <published>2017-01-01T00:00:00+00:00</published>
        <updated>2017-01-01T00:00:00+00:00</updated>

        <author>
          <name>
            Foo Doe
          </name>
        </author>

        <author>
          <name>
            Bar Doe
          </name>
        </author>

        <author>
          <name>
            Baz Doe
          </name>
        </author>

        <link rel="alternate" href="https://replace-this-with-your-url.com/posts/tutorials/programming/rust/" type="text/html"/>
        <id>https://replace-this-with-your-url.com/posts/tutorials/programming/rust/</id>

        <summary type="html">&lt;p&gt;A simple page&lt;&#x2F;p&gt;
</summary>

    </entry>

[heitorPB]

@Keats do you think I should add anything to the documentation? For example, what gets added to the atom/rss feed?

[Keats]

Neat, thanks!