From 24e71115c394ed5e03a3a8761d7ca999db4d71ec Mon Sep 17 00:00:00 2001
From: Pascal Birchler <pascalb@google.com>
Date: Mon, 27 Jan 2025 20:12:25 +0100
Subject: [PATCH 1/3] Detect WordPress theme slugs

---
 dist/cms.js | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/dist/cms.js b/dist/cms.js
index fa92bf8..7cf51c5 100644
--- a/dist/cms.js
+++ b/dist/cms.js
@@ -4,6 +4,39 @@ function usesBlockTheme() {
   return !!document.querySelector('div.wp-site-blocks');
 }
 
+/**
+ * Detects the WordPress parent and child theme slugs.
+ *
+ * See https://core.trac.wordpress.org/changeset/59698.
+ *
+ * @returns {object} Object with fields `theme` and `parent_theme`.
+ */
+function getWordPressTheme() {
+  const theme = {
+    theme: 'unknown',
+    parent_theme: '',
+  };
+  try {
+    const bodyClass = document.body.classList;
+
+    const parentTheme = Array.from( bodyClass ).find( c => c.startsWith( 'wp-theme-' ) );
+    const childTheme = Array.from( bodyClass ).find( c => c.startsWith( 'wp-child-theme-' ) );
+
+    if ( childTheme ) {
+      theme.theme = childTheme;
+
+      // If there is a child theme, there should always be a parent theme.
+      if ( parentTheme ) {
+        theme.parent_theme = parentTheme;
+      }
+    } else if ( parentTheme ) {
+      // There is no child theme, only a parent theme.
+      theme.theme = parentTheme;
+    }
+  } catch ( e ) {}
+  return theme;
+}
+
 // Detects if a WordPress embed block is on the page
 function hasWordPressEmbedBlock() {
   return !!document.querySelector('figure.wp-block-embed');
@@ -195,6 +228,7 @@ function usesInteractivityAPI() {
 }
 
 const wordpress = {
+  theme: getWordPressTheme(),
   block_theme: usesBlockTheme(),
   has_embed_block: hasWordPressEmbedBlock(),
   embed_block_count: getWordPressEmbedBlockCounts(),

From 9096c26f308299bd9546a3115c493ee3d3dbc683 Mon Sep 17 00:00:00 2001
From: Pascal Birchler <pascalb@google.com>
Date: Mon, 27 Jan 2025 21:04:30 +0100
Subject: [PATCH 2/3] Fix class name

---
 dist/cms.js | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/dist/cms.js b/dist/cms.js
index 7cf51c5..45fdeb8 100644
--- a/dist/cms.js
+++ b/dist/cms.js
@@ -13,26 +13,24 @@ function usesBlockTheme() {
  */
 function getWordPressTheme() {
   const theme = {
-    theme: 'unknown',
-    parent_theme: '',
+    theme: '',
+    child_theme: '',
   };
   try {
     const bodyClass = document.body.classList;
 
     const parentTheme = Array.from( bodyClass ).find( c => c.startsWith( 'wp-theme-' ) );
+
+    if ( parentTheme ) {
+      theme.theme = parentTheme.replace( 'wp-theme-', '' );
+    }
+
     const childTheme = Array.from( bodyClass ).find( c => c.startsWith( 'wp-child-theme-' ) );
 
     if ( childTheme ) {
-      theme.theme = childTheme;
-
-      // If there is a child theme, there should always be a parent theme.
-      if ( parentTheme ) {
-        theme.parent_theme = parentTheme;
-      }
-    } else if ( parentTheme ) {
-      // There is no child theme, only a parent theme.
-      theme.theme = parentTheme;
+      theme.child_theme = childTheme.replace( 'wp-child-theme-', '' );
     }
+
   } catch ( e ) {}
   return theme;
 }

From ac0742e0a38ba62ed37f03973af4659c2ed725f1 Mon Sep 17 00:00:00 2001
From: Pascal Birchler <pascalb@google.com>
Date: Mon, 27 Jan 2025 22:06:32 +0100
Subject: [PATCH 3/3] default null

---
 dist/cms.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/dist/cms.js b/dist/cms.js
index 45fdeb8..f708bc0 100644
--- a/dist/cms.js
+++ b/dist/cms.js
@@ -13,8 +13,8 @@ function usesBlockTheme() {
  */
 function getWordPressTheme() {
   const theme = {
-    theme: '',
-    child_theme: '',
+    theme: null,
+    child_theme: null,
   };
   try {
     const bodyClass = document.body.classList;
@@ -23,6 +23,7 @@ function getWordPressTheme() {
 
     if ( parentTheme ) {
       theme.theme = parentTheme.replace( 'wp-theme-', '' );
+      theme.child_theme = '';
     }
 
     const childTheme = Array.from( bodyClass ).find( c => c.startsWith( 'wp-child-theme-' ) );