From 4b76a842e08dee3ad179bccd138c4b10605d1856 Mon Sep 17 00:00:00 2001
From: Adam Wood <1017872+adamwoodnz@users.noreply.github.com>
Date: Mon, 21 Oct 2024 10:31:54 +1300
Subject: [PATCH] Filter callout block render and render a notice block

Closes https://github.com/WordPress/wordpress.org/issues/374
---
 mu-plugins/blocks/notice/index.php | 41 +++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 7 deletions(-)

diff --git a/mu-plugins/blocks/notice/index.php b/mu-plugins/blocks/notice/index.php
index ebc9fb755..bb49dc249 100644
--- a/mu-plugins/blocks/notice/index.php
+++ b/mu-plugins/blocks/notice/index.php
@@ -9,6 +9,8 @@
 // Run after `WPorg_Handbook_Callout_Boxes` registers the shortcodes.
 add_action( 'init', __NAMESPACE__ . '\init', 11 );
 
+add_filter( 'pre_render_block', __NAMESPACE__ . '\render_callout_block_as_notice', 11, 2 );
+
 /**
  * Registers the block using the metadata loaded from the `block.json` file.
  * Behind the scenes, it registers also all assets so they can be enqueued
@@ -21,20 +23,20 @@ function init() {
 
 	foreach ( [ 'info', 'tip', 'alert', 'tutorial', 'warning' ] as $shortcode ) {
 		remove_shortcode( $shortcode );
-		add_shortcode( $shortcode, __NAMESPACE__ . '\render_shortcode' );
+		add_shortcode( $shortcode, __NAMESPACE__ . '\render_callout_as_notice' );
 	}
 }
 
 /**
- * Display the callout shortcodes using the notice block.
+ * Display a callout using the notice block.
  *
- * @param array|string $attr    Shortcode attributes array or empty string.
- * @param string       $content Shortcode content.
- * @param string       $tag     Shortcode name.
+ * @param array|string $attr    Callout shortcode attributes array or empty string.
+ * @param string       $content Callout content.
+ * @param string       $tag     Callout name.
  *
- * @return string Shortcode output as HTML markup.
+ * @return string Callout output as HTML markup.
  */
-function render_shortcode( $attr, $content, $tag ) {
+function render_callout_as_notice( $attr, $content, $tag ) {
 	$shortcode_mapping = array(
 		'info'     => 'info',
 		'tip'      => 'tip',
@@ -70,3 +72,28 @@ function render_shortcode( $attr, $content, $tag ) {
 
 	return $final_markup;
 }
+
+/**
+ * Renders a callout block as a notice.
+ *
+ * @param string|null $pre_render The pre-rendered content or null.
+ * @param array       $parsed_block The parsed block array.
+ * @return string|null The rendered notice or the original pre-render value.
+ */
+function render_callout_block_as_notice( $pre_render, $parsed_block ) {
+	if ( is_admin() || 'wporg/callout' !== $parsed_block['blockName'] ) {
+		return $pre_render;
+	}
+
+	$callout_wrapper = $parsed_block['innerHTML'];
+	// Extract the specific "callout-*" class and remove the "callout-" prefix
+	preg_match( '/\bcallout-([\w-]+)\b/', $callout_wrapper, $matches );
+	$tag = $matches[1] ?? 'info';
+
+	$content = '';
+	foreach ( $parsed_block['innerBlocks'] as $inner_block ) {
+		$content .= render_block( $inner_block );
+	}
+
+	return render_callout_as_notice( '', $content, $tag );
+}