From 9ea82c5c8247d4dd220e7441be645acc00e8cf29 Mon Sep 17 00:00:00 2001
From: Zhan Shuo <trizsqwq@gmail.com>
Date: Sun, 29 May 2022 18:38:59 +0000
Subject: [PATCH] dynamic change utterances theme with coder theme (#676)

---
 assets/js/coder.js |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/assets/js/coder.js b/assets/js/coder.js
index 6daa1ef..0c12436 100644
--- a/assets/js/coder.js
+++ b/assets/js/coder.js
@@ -34,6 +34,48 @@
     body.classList.remove('colorscheme-' + inverse);
     body.classList.add('colorscheme-' + theme);
     document.documentElement.style['color-scheme'] = theme;
+
+    function waitForElm(selector) {
+        return new Promise(resolve => {
+            if (document.querySelector(selector)) {
+                return resolve(document.querySelector(selector));
+            }
+    
+            const observer = new MutationObserver(mutations => {
+                if (document.querySelector(selector)) {
+                    resolve(document.querySelector(selector));
+                    observer.disconnect();
+                }
+            });
+
+            observer.observe(document.body, {
+                childList: true,
+                subtree: true
+            });
+        });
+    }
+
+    if (theme === 'dark') {
+        const message = {
+            type: 'set-theme',
+            theme: 'github-dark'
+        };
+        waitForElm('.utterances-frame').then((iframe) => {
+            iframe.contentWindow.postMessage(message, 'https://utteranc.es');
+        })
+        
+    }
+    else {
+        const message = {
+            type: 'set-theme',
+            theme: 'github-light'
+        };
+        waitForElm('.utterances-frame').then((iframe) => {
+            iframe.contentWindow.postMessage(message, 'https://utteranc.es');
+        })
+        
+    }
+    
 }
 
 function rememberTheme(theme) {

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