feat: introduce Expressive Code for code block rendering (#476)

* feat: improve code block feature with Expressive Code

* docs: add example Markdown file for visual review

* feat: improve styles of Expressive Code

* fix: errors from the merging

* chore: formatting

* chore: update config

* chore: update dependencies

* fix: fix build error

* fix: minor fixes

* fix: style tweaks

* docs: update example post

* fix: isolate copy button timeouts to avoid cross-button interference

---------

Co-authored-by: Hasenpfote <Hasenpfote36@gmail.com>

src/components/misc/Markdown.astro

@@ -14,51 +14,30 @@ const className = Astro.props.class;
 </div>
 
 <script>
-  const observer = new MutationObserver(addPreCopyButton);
-  observer.observe(document.body, { childList: true, subtree: true });
-  
-  function addPreCopyButton() {
-    observer.disconnect();
-    
-    let codeBlocks = Array.from(document.querySelectorAll("pre"));
+document.addEventListener("click", function (e: MouseEvent) {
+    const target = e.target as Element | null;
+    if (target && target.classList.contains("copy-btn")) {
+        const preEle = target.closest("pre");
+        const codeEle = preEle?.querySelector("code");
+        const code = Array.from(codeEle?.querySelectorAll(".code:not(summary *)") ?? [])
+            .map(el => el.textContent)
+            .map(t => t === "\n" ? "" : t)
+            .join("\n");
+        navigator.clipboard.writeText(code);
 
-    for (let codeBlock of codeBlocks) {
-      if (codeBlock.parentElement?.nodeName === "DIV" && codeBlock.parentElement?.classList.contains("code-block")) continue
-
-      let wrapper = document.createElement("div");
-      wrapper.className = "relative code-block";
-
-      let copyButton = document.createElement("button");
-      copyButton.className = "copy-btn btn-regular-dark absolute active:scale-90 h-8 w-8 top-2 right-2 opacity-75 text-sm p-1.5 rounded-lg transition-all ease-in-out";
-
-      codeBlock.setAttribute("tabindex", "0");
-      if (codeBlock.parentNode) {
-        codeBlock.parentNode.insertBefore(wrapper, codeBlock);
-      }
-
-      let copyIcon = `<svg class="copy-btn-icon copy-icon" xmlns="http://www.w3.org/2000/svg" height="20px" viewBox="0 -960 960 960" width="20px"><path d="M368.37-237.37q-34.48 0-58.74-24.26-24.26-24.26-24.26-58.74v-474.26q0-34.48 24.26-58.74 24.26-24.26 58.74-24.26h378.26q34.48 0 58.74 24.26 24.26 24.26 24.26 58.74v474.26q0 34.48-24.26 58.74-24.26 24.26-58.74 24.26H368.37Zm0-83h378.26v-474.26H368.37v474.26Zm-155 238q-34.48 0-58.74-24.26-24.26-24.26-24.26-58.74v-515.76q0-17.45 11.96-29.48 11.97-12.02 29.33-12.02t29.54 12.02q12.17 12.03 12.17 29.48v515.76h419.76q17.45 0 29.48 11.96 12.02 11.97 12.02 29.33t-12.02 29.54q-12.03 12.17-29.48 12.17H213.37Zm155-238v-474.26 474.26Z"/></svg>`
-      let successIcon = `<svg class="copy-btn-icon success-icon" xmlns="http://www.w3.org/2000/svg" height="20px" viewBox="0 -960 960 960" width="20px"><path d="m389-377.13 294.7-294.7q12.58-12.67 29.52-12.67 16.93 0 29.61 12.67 12.67 12.68 12.67 29.53 0 16.86-12.28 29.14L419.07-288.41q-12.59 12.67-29.52 12.67-16.94 0-29.62-12.67L217.41-430.93q-12.67-12.68-12.79-29.45-.12-16.77 12.55-29.45 12.68-12.67 29.62-12.67 16.93 0 29.28 12.67L389-377.13Z"/></svg>`
-      copyButton.innerHTML = `<div>${copyIcon} ${successIcon}</div>
-      `
-
-      wrapper.appendChild(codeBlock);
-      wrapper.appendChild(copyButton);
-
-      let timeout: ReturnType<typeof setTimeout>;
-      copyButton.addEventListener("click", async () => {
-        if (timeout) {
-            clearTimeout(timeout);
+        const timeoutId = target.getAttribute("data-timeout-id");
+        if (timeoutId) {
+            clearTimeout(parseInt(timeoutId));
         }
-        let text = codeBlock?.querySelector("code")?.innerText;
-        if (text === undefined) return;
-        await navigator.clipboard.writeText(text);
-        copyButton.classList.add("success");
-        timeout = setTimeout(() => {
-          copyButton.classList.remove("success");
+
+        target.classList.add("success");
+
+        // 设置新的timeout并保存ID到按钮的自定义属性中
+        const newTimeoutId = setTimeout(() => {
+            target.classList.remove("success");
         }, 1000);
-      });
+
+        target.setAttribute("data-timeout-id", newTimeoutId.toString());
     }
-    
-    observer.observe(document.body, { childList: true, subtree: true });
-  }
+});
 </script>