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Load page templates via theme.json abstractions #28700

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merged 7 commits into from
Feb 5, 2021

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@oandregal oandregal commented Feb 3, 2021

This PR is a follow up to #27778 (which introduced the pageTemplates field in theme.json) and #28110 #28533 that refactored it to accommodate the new needs for this file #28163

The idea is to mature the APIs we use to read data from theme.json, as to:

  1. Minimize costly operations: read and parse JSON file, read from the database, etc.
  2. Provide abstractions over how to access the underlying data (files in the case of core and theme data / CustomPostType in the case of user data).
  3. Centralize logic so the hard parts are easier (things like merging core/theme/user data, translations, rearranging keys, etc).

An initial list of steps we need to check when adding new fields to theme.json:

  • Add the new field to the theme.json schema.
  • Does the field needs any special validation/escaping?
  • Does this field needs to merge values from core, theme, and user origins?
  • Add unit tests to cover the use case.
  • Does this field needs to be translated?

While the role of the WP_Theme_JSON class in this space seems well established, the role of WP_Theme_JSON_Resolver needs to be accommodated to the new use cases we want to support beyond settings & styles. This PR is the first step to do that and uses pageTemplates as an example.

Proposed API for consumers:

$resolver = WP_Theme_JSON_Resolver();
$resolver->get_theme_data()->get_page_templates();

How to test

  • Use and activate the TT1-blocks (latest master branch). It defines one page template: page-home whose text is "Page without title".
  • Load a page and make sure it appears in the template selector (page sidebar > page attributes):
    Captura de ecrã de 2021-02-04 14-21-55
  • Go to the experimental-theme.json of the TT1-blocks theme and update the text to be "My home page".
  • Reload the editor and verify the new text is present in the template selector.

Follow-ups

This PR refactors code, it doesn't change any behavior. A follow up to this that adds new behavior is a PR that enables the page template title to be translated.

I think WP_Theme_JSON_Resolver needs more maturation. I'd like to create small and focused follow-up PRs to improve it. It'll allow us to move quickly by making reviews easier.

@oandregal oandregal self-assigned this Feb 3, 2021
@oandregal oandregal added the [Status] In Progress Tracking issues with work in progress label Feb 3, 2021
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@oandregal oandregal force-pushed the update/page-templates-theme-json branch from 11f4d79 to 247efa2 Compare February 4, 2021 13:20
@oandregal oandregal removed the [Status] In Progress Tracking issues with work in progress label Feb 4, 2021
@oandregal oandregal added Global Styles Anything related to the broader Global Styles efforts, including Styles Engine and theme.json [Feature] Full Site Editing labels Feb 4, 2021
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This looks great and testing works well.

I hope you don't mind - I pushed a commit of composer format to make the php tests happy and hopefully pass.

lib/class-wp-theme-json-resolver.php Outdated Show resolved Hide resolved
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I hope you don't mind - I pushed a commit of composer format to make the php tests happy and hopefully pass.

Thank you 🙂

@oandregal oandregal force-pushed the update/page-templates-theme-json branch from 6ed01a9 to 469cb6c Compare February 5, 2021 10:16
@oandregal oandregal merged commit a863239 into master Feb 5, 2021
@oandregal oandregal deleted the update/page-templates-theme-json branch February 5, 2021 10:51
@github-actions github-actions bot added this to the Gutenberg 10.0 milestone Feb 5, 2021
Comment on lines +21 to +22
$resolver = new WP_Theme_JSON_Resolver();
$data = $resolver->get_theme_data()->get_page_templates();
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Circling back to this. Now that theme is static. Do we need to call new here? Or would something like:
WP_Theme_JSON_Resolver::get_theme_data()->get_page_templates(); work?

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Here's the follow-up that bundles non-behavioral changes: #28855 (it also makes get_theme_data static).

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