Use `{{ if not .Date.IsZero }}` to print dates only when they are
defined. This is to avoid things like
<lastBuildDate>Mon, 01 Jan 0001 00:00:00 +0000</lastBuildDate>
and
<lastmod>0001-01-01T00:00:00+00:00</lastmod>
showing up in index.xml (RSS) and sitemap.xml.
Pipe dates with ±hh:mm time zone through `safeHtml`
to prevent the `+` sign from turning into `+`.
Also make some shuffling to avoid blank lines in the output.
* template: _internal/_default/opengraph.html:39: unexpected EOF
* template: _internal/_default/schema.html:15: unexpected {{end}}
Also change the DateTime inside these templates to ISO 8601 format,
and skip <meta itemprop="datePublished"> if `publishdate` is not set.
Perhaps it would be a good idea to expose `func (Time) IsZero`
to our templates? :-)
RSS 2.0 requires the email be listed in `<author>`,
and `UTC` as a timezone is not accepted, but `UT` or `GMT` are.
See #789 for more information. Thanks to @snej for the report!
- `.Ref` and `.RelRef` take a reference (the logical filename for a
page, including extension and/or a document fragment ID) and return
a permalink (or relative permalink) to the referenced document.
- If the reference is a page name (such as `about.md`), the page
will be discovered and the permalink will be returned: `/about/`
- If the reference is a page name with a fragment (such as
`about.md#who`), the page will be discovered and used to add the
`page.UniqueID()` to the resulting fragment and permalink:
`/about/#who:deadbeef`.
- If the reference is a fragment and `.*Ref` has been called from
a `Node` or `SiteInfo`, it will be returned as is: `#who`.
- If the reference is a fragment and `.*Ref` has been called from
a `Page`, it will be returned with the page’s unique ID:
`#who:deadbeef`.
- `.*Ref` can be called from either `Node`, `SiteInfo` (e.g.,
`Node.Site`), `Page` objects, or `ShortcodeWithPage` objects in
templates.
- `.*Ref` cannot be used in content, so two shortcodes have been
created to provide the functionality to content: `ref` and `relref`.
These are intended to be used within markup, like `[Who]({{% ref
about.md#who %}})` or `<a href="{{% ref about.md#who %}}">Who</a>`.
- There are also `ref` and `relref` template functions (used to create
the shortcodes) that expect a `Page` or `Node` object and the
reference string (e.g., `{{ relref . "about.md" }}` or `{{
"about.md" | ref . }}`). It actually looks for `.*Ref` as defined on
`Node` or `Page` objects.
- Shortcode handling had to use a *differently unique* wrapper in
`createShortcodePlaceholder` because of the way that the `ref` and
`relref` are intended to be used in content.
