Add reactionsEnabled and emitMetadata config for giscuss

+ Format code

exampleSite/config.yaml

@@ -94,13 +94,15 @@ params:
             lang:
 
         giscus:
-            repo: 
-            repoID: 
-            category: 
-            categoryID: 
-            mapping: 
-            lightTheme: 
-            darkTheme: 
+            repo:
+            repoID:
+            category:
+            categoryID:
+            mapping:
+            lightTheme:
+            darkTheme:
+            reactionsEnabled: 1
+            emitMetadata: 0
 
     widgets:
         enabled:
@@ -152,8 +154,8 @@ menu:
           weight: -100
           pre: home
           params:
-            ### For demonstration purpose, the home link will be open in a new tab
-            newTab: true
+              ### For demonstration purpose, the home link will be open in a new tab
+              newTab: true
 
 related:
     includeNewer: true

layouts/partials/comments/provider/giscus.html

@@ -5,40 +5,45 @@
     data-repo-id="{{- .repoID -}}"
     data-category="{{- .category -}}"
     data-category-id="{{- .categoryID -}}"
-    data-mapping="{{- default "title" .mapping -}}"
-    data-reactions-enabled="1"
-    data-emit-metadata="0"
-    data-theme="{{- default "light" .lightTheme -}}"
+    data-mapping="{{- default `title` .mapping -}}"
+    data-reactions-enabled="{{- default 1 .reactionsEnabled -}}"
+    data-emit-metadata="{{- default 0 .emitMetadata -}}"
+    data-theme="{{- default `light` .lightTheme -}}"
     crossorigin="anonymous"
     async
 ></script>
 <script>
-
     function setGiscusTheme(theme) {
         let giscus = document.querySelector('iframe.giscus-frame');
         if (giscus) {
             giscus.contentWindow.postMessage(
-                { giscus: { setConfig: { theme: theme } } },
+                { 
+                    giscus: {
+                        setConfig: { 
+                            theme: theme 
+                        }
+                    }
+                },
                 "https://giscus.app"
             );
         };
     };
 
     (function(){
-        const head = document.getElementsByTagName("html")[0];
-
-        addEventListener('message', handler);
+        addEventListener('message', (e) => {
+            if (event.origin !== 'https://giscus.app') return;
+            handler()
+        });
         window.addEventListener('onColorSchemeChange', handler);
 
         function handler() {
-            if (head.getAttribute("data-scheme") == "light") {
+            if (document.documentElement.dataset.scheme === "light") {
                 setGiscusTheme('{{- default "light" .lightTheme -}}');
             } else {
                 setGiscusTheme('{{- default "dark_dimmed" .darkTheme -}}');
             };
         };
     }());
-
 </script>
 {{- end -}}