Footnotes: store in revisions

packages/block-library/src/footnotes/index.php

@@ -78,3 +78,129 @@ function register_block_core_footnotes() {
  );
 }
 add_action( 'init', 'register_block_core_footnotes' );
+
+add_action(
+ 'wp_after_insert_post',
+ /**
+ * Saves the footnotes meta value to the revision.
+ *
+ * @param int $revision_id The revision ID.
+ */
+ function( $revision_id ) {
+ $post_id = wp_is_post_revision( $revision_id );
+
+ if ( $post_id ) {
+ $footnotes = get_post_meta( $post_id, 'footnotes', true );
+
+ if ( $footnotes ) {
+ // Can't use update_post_meta() because it doesn't allow revisions.
+ update_metadata( 'post', $revision_id, 'footnotes', $footnotes );
+ }
+ }
+ }
+);
+
+add_action(
+ '_wp_put_post_revision',
+ /**
+ * Keeps track of the revision ID for "rest_after_insert_{$post_type}".
+ *
+ * @param int $revision_id The revision ID.
+ */
+ function( $revision_id ) {
+ global $_gutenberg_revision_id;
+ $_gutenberg_revision_id = $revision_id;
+ }
+);
+
+foreach ( array( 'post', 'page' ) as $post_type ) {
+ add_action(
+ "rest_after_insert_{$post_type}",
+ /**
+ * This is a specific fix for the REST API. The REST API doesn't update
+ * the post and post meta in one go (through `meta_input`). While it
+ * does fix the `wp_after_insert_post` hook to be called correctly after
+ * updating meta, it does NOT fix hooks such as post_updated and
+ * save_post, which are normally also fired after post meta is updated
+ * in `wp_insert_post()`. Unfortunately, `wp_save_post_revision` is
+ * added to the `post_updated` action, which means the meta is not
+ * available at the time, so we have to add it afterwards through the
+ * `"rest_after_insert_{$post_type}"` action.
+ *
+ * @param WP_Post $post The post object.
+ */
+ function( $post ) {
+ global $_gutenberg_revision_id;
+
+ if ( $_gutenberg_revision_id ) {
+ $revision = get_post( $_gutenberg_revision_id );
+ $post_id = $revision->post_parent;
+
+ // Just making sure we're updating the right revision.
+ if ( $post->ID === $post_id ) {
+ $footnotes = get_post_meta( $post_id, 'footnotes', true );
+
+ if ( $footnotes ) {
+ // Can't use update_post_meta() because it doesn't allow revisions.
+ update_metadata( 'post', $_gutenberg_revision_id, 'footnotes', $footnotes );
+ }
+ }
+ }
+ }
+ );
+}
+
+add_action(
+ 'wp_restore_post_revision',
+ /**
+ * Restores the footnotes meta value from the revision.
+ *
+ * @param int $post_id The post ID.
+ * @param int $revision_id The revision ID.
+ */
+ function( $post_id, $revision_id ) {
+ $footnotes = get_post_meta( $revision_id, 'footnotes', true );
+
+ if ( $footnotes ) {
+ update_post_meta( $post_id, 'footnotes', $footnotes );
+ } else {
+ delete_post_meta( $post_id, 'footnotes' );
+ }
+ },
+ 10,
+ 2
+);
+
+add_filter(
+ '_wp_post_revision_fields',
+ /**
+ * Adds the footnotes field to the revision.
+ *
+ * @param array $fields The revision fields.
+ *
+ * @return array The revision fields.
+ */
+ function( $fields ) {
+ $fields['footnotes'] = __( 'Footnotes' );
+ return $fields;
+ }
+);
+
+add_filter(
+ 'wp_post_revision_field_footnotes',
+ /**
+ * Gets the footnotes field from the revision.
+ *
+ * @param string $revision_field The field value, but $revision->$field
+ * (footnotes) does not exist.
+ * @param string $field The field name, in this case "footnotes".
+ * @param object $revision The revision object to compare against.
+ *
+ * @return string The field value.
+ */
+ function( $revision_field, $field, $revision ) {
+ return get_metadata( 'post', $revision->ID, $field, true );
+ },
+ 10,
+ 3
+);

test/e2e/specs/editor/various/footnotes.spec.js

@@ -3,9 +3,11 @@
  */
 const { test, expect } = require( '@wordpress/e2e-test-utils-playwright' );
 
-async function getFootnotes( page ) {
+async function getFootnotes( page, withoutSave = false ) {
  // Save post so we can check meta.
- await page.click( 'button:text("Save draft")' );
+ if ( ! withoutSave ) {
+ await page.click( 'button:text("Save draft")' );
+ }
  await page.waitForSelector( 'button:text("Saved")' );
  const footnotes = await page.evaluate( () => {
  return window.wp.data
@@ -278,4 +280,84 @@ test.describe( 'Footnotes', () => {
  },
  ] );
  } );
+
+ test( 'works with revisions', async ( { editor, page } ) => {
+ await editor.canvas.click( 'role=button[name="Add default block"i]' );
+ await page.keyboard.type( 'first paragraph' );
+ await page.keyboard.press( 'Enter' );
+ await page.keyboard.type( 'second paragraph' );
+
+ await editor.showBlockToolbar();
+ await editor.clickBlockToolbarButton( 'More' );
+ await page.locator( 'button:text("Footnote")' ).click();
+
+ await page.keyboard.type( 'first footnote' );
+
+ const id1 = await editor.canvas.evaluate( () => {
+ return document.activeElement.id;
+ } );
+
+ await editor.canvas.click( 'p:text("first paragraph")' );
+
+ await editor.showBlockToolbar();
+ await editor.clickBlockToolbarButton( 'More' );
+ await page.locator( 'button:text("Footnote")' ).click();
+
+ await page.keyboard.type( 'second footnote' );
+
+ const id2 = await editor.canvas.evaluate( () => {
+ return document.activeElement.id;
+ } );
+
+ // This also saves the post!
+ expect( await getFootnotes( page ) ).toMatchObject( [
+ {
+ content: 'second footnote',
+ id: id2,
+ },
+ {
+ content: 'first footnote',
+ id: id1,
+ },
+ ] );
+
+ await editor.canvas.click( 'p:text("first paragraph")' );
+
+ await editor.showBlockToolbar();
+ await editor.clickBlockToolbarButton( 'Move down' );
+
+ // This also saves the post!
+ expect( await getFootnotes( page ) ).toMatchObject( [
+ {
+ content: 'first footnote',
+ id: id1,
+ },
+ {
+ content: 'second footnote',
+ id: id2,
+ },
+ ] );
+
+ // Open revisions.
+ await editor.openDocumentSettingsSidebar();
+ await page
+ .getByRole( 'region', { name: 'Editor settings' } )
+ .getByRole( 'button', { name: 'Post' } )
+ .click();
+ await page.locator( 'a:text("2 Revisions")' ).click();
+ await page.locator( '.revisions-controls .ui-slider-handle' ).focus();
+ await page.keyboard.press( 'ArrowLeft' );
+ await page.locator( 'input:text("Restore This Revision")' ).click();
+
+ expect( await getFootnotes( page, true ) ).toMatchObject( [
+ {
+ content: 'second footnote',
+ id: id2,
+ },
+ {
+ content: 'first footnote',
+ id: id1,
+ },
+ ] );
+ } );
 } );