From f8a1cfb06b5163e8fc4a7ed97961010fdf06c916 Mon Sep 17 00:00:00 2001
From: Dave Smith <getdavemail@gmail.com>
Date: Fri, 25 Aug 2023 15:14:21 +0100
Subject: [PATCH] Dynamic links

---
 .../block-library/src/navigation-link/edit.js | 22 ++++++++++++++++++-
 .../src/navigation-link/index.php             | 22 ++++++++++---------
 2 files changed, 33 insertions(+), 11 deletions(-)

diff --git a/packages/block-library/src/navigation-link/edit.js b/packages/block-library/src/navigation-link/edit.js
index df7ca36d7272a..919c19e587e85 100644
--- a/packages/block-library/src/navigation-link/edit.js
+++ b/packages/block-library/src/navigation-link/edit.js
@@ -35,7 +35,7 @@ import {
 } from '@wordpress/dom';
 import { decodeEntities } from '@wordpress/html-entities';
 import { link as linkIcon, addSubmenu } from '@wordpress/icons';
-import { store as coreStore } from '@wordpress/core-data';
+import { store as coreStore, useEntityRecord } from '@wordpress/core-data';
 import { useMergeRefs } from '@wordpress/compose';
 
 /**
@@ -180,6 +180,8 @@ export default function NavigationLinkEdit( {
 	const itemLabelPlaceholder = __( 'Add label…' );
 	const ref = useRef();
 
+	const { record: navPostRecord } = useEntityRecord( 'postType', type, id );
+
 	// Change the label using inspector causes rich text to change focus on firefox.
 	// This is a workaround to keep the focus on the label field when label filed is focused we don't render the rich text.
 	const [ isLabelFieldFocused, setIsLabelFieldFocused ] = useState( false );
@@ -282,6 +284,24 @@ export default function NavigationLinkEdit( {
 		}
 	}, [ url ] );
 
+	useEffect( () => {
+		// Only updates attributes if:
+		// - there is an ID (and it has changed).
+		// - there is a navPostRecord.
+		if ( id && navPostRecord ) {
+			// Conditionall update attributes to avoid
+			// unnecessary re-renders.
+			setAttributes( {
+				...( label !== navPostRecord?.title.rendered && {
+					label: navPostRecord?.title.rendered,
+				} ),
+				...( url !== navPostRecord?.link && {
+					url: navPostRecord?.link,
+				} ),
+			} );
+		}
+	}, [ id, navPostRecord ] );
+
 	/**
 	 * Focus the Link label text and select it.
 	 */
diff --git a/packages/block-library/src/navigation-link/index.php b/packages/block-library/src/navigation-link/index.php
index 5333ab6ea3dc9..8c53f9086089e 100644
--- a/packages/block-library/src/navigation-link/index.php
+++ b/packages/block-library/src/navigation-link/index.php
@@ -160,16 +160,18 @@ function render_block_core_navigation_link( $attributes, $content, $block ) {
 	$is_post_type           = isset( $attributes['kind'] ) && 'post-type' === $attributes['kind'];
 	$is_post_type           = $is_post_type || isset( $attributes['type'] ) && ( 'post' === $attributes['type'] || 'page' === $attributes['type'] );
 
+	$post = $is_post_type && $navigation_link_has_id ? get_post( $attributes['id'] ) : null;
+
 	// Don't render the block's subtree if it is a draft or if the ID does not exist.
-	if ( $is_post_type && $navigation_link_has_id ) {
-		$post = get_post( $attributes['id'] );
-		if ( ! $post || 'publish' !== $post->post_status ) {
-			return '';
-		}
+	if ( ! $post || 'publish' !== $post->post_status ) {
+		return '';
 	}
 
+	$dynamic_url   = $post ? get_permalink( $post ) : $attributes['url'];
+	$dynamic_label = $post ? $post->post_title : $attributes['label'];
+
 	// Don't render the block's subtree if it has no label.
-	if ( empty( $attributes['label'] ) ) {
+	if ( empty( $dynamic_label ) ) {
 		return '';
 	}
 
@@ -195,8 +197,8 @@ function render_block_core_navigation_link( $attributes, $content, $block ) {
 		'<a class="wp-block-navigation-item__content" ';
 
 	// Start appending HTML attributes to anchor tag.
-	if ( isset( $attributes['url'] ) ) {
-		$html .= ' href="' . esc_url( block_core_navigation_link_maybe_urldecode( $attributes['url'] ) ) . '"';
+	if ( isset( $dynamic_url ) ) {
+		$html .= ' href="' . esc_url( block_core_navigation_link_maybe_urldecode( $dynamic_url ) ) . '"';
 	}
 
 	if ( $is_active ) {
@@ -224,8 +226,8 @@ function render_block_core_navigation_link( $attributes, $content, $block ) {
 		// Wrap title with span to isolate it from submenu icon.
 		'<span class="wp-block-navigation-item__label">';
 
-	if ( isset( $attributes['label'] ) ) {
-		$html .= wp_kses_post( $attributes['label'] );
+	if ( isset( $dynamic_label ) ) {
+		$html .= wp_kses_post( $dynamic_label );
 	}
 
 	$html .= '</span>';