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Add support for custom templates in FSE themes #27778

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merged 5 commits into from
Dec 21, 2020

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youknowriad
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@youknowriad youknowriad commented Dec 17, 2020

This brings the "custom templates" feature from classic themes to FSE themes. While in classic themes, this is done by adding a comment at the top of the template file, this can't be done for FSE themes since they are just HTML files.
(it might change later but let's do with what we have now)

So in order to support these, developers need to:

  • Add custom files like about.html/ custom.html ... to the block-templates folder.
  • Add a customTemplates property to the root level of theme.json like so
	"customTemplates": {
		"custom": "My Custom Template"
	}

and that's it. The templates will show up in the template picker on the sidebar of the editor.
In terms of UI and integration with the template mode, we can do a lot more than the old select box. We can show a preview for templates and offer a modal or something like that for folks to pick from... We'd need some design thinking and explorations there. This PR just sets the technical requirements to make it work.

@youknowriad youknowriad self-assigned this Dec 17, 2020
@youknowriad youknowriad added the [Feature] Themes Questions or issues with incorporating or styling blocks in a theme. label Dec 17, 2020
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@gziolo gziolo requested a review from Copons December 17, 2020 10:38
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gziolo commented Dec 17, 2020

This sounds great. It might require some alignment with how the default template types are structured:

'index' => array(
'title' => _x( 'Index', 'Template name', 'gutenberg' ),
'description' => __( 'The default template which is used when no other template can be found', 'gutenberg' ),
),

As of today it's:

  • slug (as index)
  • title
  • description

It looks like i18n support would need to be handled as well.

@jasmussen
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jasmussen commented Dec 17, 2020

Wonderful. The exiting feature is called "Page Templates", referring to the fact that you can only use these when editing pages. It seems to make sense to rename from that since you could create a fresh new "Single" or "Archive" template with one of the custom ones as a starting point. But at the same time, "Custom Templates" may not be the best word, as they are still technically bundled with the theme with all the other templates stored in the block-templates directory — the real custom template, I would suggest, is created when a user modifies a template and saves that to the database.

I know the term is only used in the code, but is there a better term for it? "Additional templates"? "Unattached templates"? "Optional"?

@youknowriad
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I don't hold strong a opinion on the naming. The only places where this is used right now is theme.json file. It can be just "templates" to be honest or maybe "extraTemplates" 🤷

@jasmussen
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I like "Templates".

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mtias commented Dec 17, 2020

The exiting feature is called "Page Templates", referring to the fact that you can only use these when editing pages.

Custom templates are by default assigned only to pages, but you can specify they should be made available to other post types: https://developer.wordpress.org/themes/template-files-section/page-template-files/#creating-page-templates-for-specific-post-types

I'm not sure we should use just "Templates" since all the other files (or posts in wp_templates) are also templates.

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"Supplementary Templates" is accurate, but is a bit long and doesn't roll off the tongue. "Extra Templates" may be best then?

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mtias commented Dec 17, 2020

I'm confused, why not just page templates or custom templates?

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jasmussen commented Dec 17, 2020

I wouldn't object to either of those. But here's my reasoning.

  • Page templates suggest they're just for pages, but they could be starting points for anything.
  • Custom templates are custom, sure, but not as custom as those a user saves to the database, and you can't delete them from the site editor like you can your other custom templates.

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mtias commented Dec 17, 2020

but they could be starting points for anything

Not for anything, for different post types if so specified. I think it's important to have some continuity and not add to the burden of concepts.

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Page Templates would probably be for for the SEO then.

@youknowriad
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Ok so I updated to use "postTemplates" as a config key and used the format suggested by @gziolo
We can also set a "postTypes" property now to indicate on which CPTs the template applies.

@youknowriad youknowriad force-pushed the add/support-custom-templates branch from cb46ad0 to a19fca1 Compare December 21, 2020 07:58
* @param WP_Post $post The post being edited, provided for context, or null.
* @return array (Maybe) modified page templates array.
*/
function gutenberg_load_fse_page_templates( $templates, $theme, $post ) {
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not blocking, but we should start dropping the "fse" term in functions, etc, to something more general like load_block_page_templates

Comment on lines +41 to +42
add_filter( 'theme_post_templates', 'gutenberg_load_block_page_templates', 10, 3 );
add_filter( 'theme_page_templates', 'gutenberg_load_block_page_templates', 10, 3 );
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@youknowriad What about other post types? IMO the generic theme_templates filter should be used here.

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Ok so I updated to use "postTemplates" as a config key and used the format suggested by @gziolo
We can also set a "postTypes" property now to indicate on which CPTs the template applies.

Why was postTemplates not kept? Why is it now pageTemplates?

WordPress uses the term "post template" internally (see \WP_Theme::get_post_templates() for example), so this feels like a step backward.

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mtias commented Feb 5, 2021

I think "post" can become quite confusing (particularly for a more user facing API, which building a theme is) because we already have templates that apply to the content of a post (on a CPT). Page signals more clearly it is applying beyond the content (the page template for a post type makes sense). Also the fact these templates are by default only available for post type = page. The fact that internally everything is a post doesn't necessarily mean, in my opinion, we should call something like menus postMenus on more surface level APIs. In any case, perhaps customTemplates is better here?

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