experiment with adding line breaks in post excerpts

functions.php

@@ -31,3 +31,38 @@ function autonomic_theme_scripts() {
     wp_enqueue_script( 'autonomic-block-styles', get_theme_file_uri( '/js/block-styles.js' ), array( 'wp-blocks', 'wp-dom-ready', 'wp-edit-post' ), filemtime( get_theme_file_uri( '/js/block-styles.js' ) ));
 }
 add_action( 'enqueue_block_editor_assets', 'autonomic_theme_scripts' );
+
+
+// Code for enabling line breaks in post excerpts
+
+define('EXCERPT_RARELY', '{[}]');
+define('EXCERPT_BR', nl2br(PHP_EOL));
+
+function so306588_trim_excerpt_custom($text = '')
+{
+    add_filter('the_content', 'so306588_trim_excerpt_custom_mark', 6);
+
+    // get through origin filter
+    $text = wp_trim_excerpt($text);
+
+    remove_filter('the_content', 'so306588_trim_excerpt_custom_mark', 6);
+
+    return so306588_trim_excerpt_custom_restore($text);
+}
+
+function so306588_trim_excerpt_custom_mark($text)
+{
+    $text = nl2br($text);
+    return str_replace(EXCERPT_BR, EXCERPT_RARELY, $text);
+}
+
+function so306588_trim_excerpt_custom_restore($text)
+{
+    return str_replace(EXCERPT_RARELY, EXCERPT_BR, $text);
+}
+
+// remove default filter
+remove_filter('get_the_excerpt', 'wp_trim_excerpt');
+
+// add custom filter
+add_filter('get_the_excerpt', 'so306588_trim_excerpt_custom');