[FIX] Fix giscus plugin (PKUFlyingPig#543)

Author: PKUFlyingPig

overrides/main.html

@@ -0,0 +1,52 @@
+<!-- Insert generated snippet here -->
+<script src="https://giscus.app/client.js"
+        data-repo="PKUFlyingPig/cs-self-learning"
+        data-repo-id="R_kgDOGP67ng"
+        data-category="Announcements"
+        data-category-id="DIC_kwDOGP67ns4COM9Q"
+        data-mapping="title"
+        data-reactions-enabled="1"
+        data-emit-metadata="0"
+        data-input-position="top"
+        data-theme="light_protanopia"
+        data-lang="zh-CN"
+        data-loading="lazy"
+        crossorigin="anonymous"
+        async>
+</script>
+
+<!-- Synchronize Giscus theme with palette -->
+<script>
+var giscus = document.querySelector("script[src*=giscus]")
+
+// Set palette on initial load
+var palette = __md_get("__palette")
+if (palette && typeof palette.color === "object") {
+    var theme = palette.color.scheme === "slate"
+    ? "dark_protanopia"
+    : "light_protanopia"
+
+    // Instruct Giscus to set theme
+    giscus.setAttribute("data-theme", theme) 
+}
+
+// Register event handlers after documented loaded
+document.addEventListener("DOMContentLoaded", function() {
+    var ref = document.querySelector("[data-md-component=palette]")
+    ref.addEventListener("change", function() {
+    var palette = __md_get("__palette")
+    if (palette && typeof palette.color === "object") {
+        var theme = palette.color.scheme === "slate"
+        ? "dark_protanopia"
+        : "light_protanopia"
+
+        // Instruct Giscus to change theme
+        var frame = document.querySelector(".giscus-frame")
+        frame.contentWindow.postMessage(
+        { giscus: { setConfig: { theme } } },
+        "https://giscus.app"
+        )
+    }
+    })
+})
+</script>