1 files changed, 64 insertions, 0 deletions
diff --git a/static/codecopy.js b/static/codecopy.js
new file mode 100644
index 0000000..7163cdb
--- /dev/null
+++ b/static/codecopy.js
@@ -0,0 +1,64 @@
+// https://aaronluna.dev/blog/add-copy-button-to-code-blocks-hugo-chroma/
+
+// create copy button
+function ccb(highlightDiv) {
+  const button = document.createElement("button");
+  button.className = "cc ";
+  button.type = "button";
+  button.innerHTML = "Copy";
+  button.addEventListener("click", () =>
+    ccc(button, highlightDiv)
+  );
+
+  // addCopyButtonToDom
+  const wrapper = document.createElement("div");
+  wrapper.className = "ccw";
+  wrapper.appendChild(button);
+  highlightDiv.parentNode.insertBefore(wrapper, highlightDiv);
+  wrapper.appendChild(highlightDiv);
+}
+
+// copy code clipboard
+async function ccc(button, highlightDiv) {
+  const codeToCopy = highlightDiv.querySelector(":last-child > code")
+    .innerText;
+  try {
+    result = await navigator.permissions.query({ name: "clipboard-write" });
+    if (result.state == "granted" || result.state == "prompt") {
+      await navigator.clipboard.writeText(codeToCopy);
+    } else {
+      cce(codeToCopy, highlightDiv);//copyCodeBlockExecCommand
+    }
+  } catch (_) {
+    cce(codeToCopy, highlightDiv);//copyCodeBlockExecCommand
+  } finally {
+    //codeWasCopied
+    button.blur();
+    button.innerHTML = "Copied";
+    setTimeout(function () {
+      button.innerHTML = "Copy";
+    }, 2000);
+  }
+}
+
+//copyCodeBlockExecCommand
+function cce(codeToCopy, highlightDiv) {
+  const textArea = document.createElement("textArea");
+  textArea.contentEditable = "true";
+  textArea.readOnly = "false";
+  textArea.className = "copyable-text-area";
+  textArea.value = codeToCopy;
+  highlightDiv.insertBefore(textArea, highlightDiv.firstChild);
+  const range = document.createRange();
+  range.selectNodeContents(textArea);
+  const sel = window.getSelection();
+  sel.removeAllRanges();
+  sel.addRange(range);
+  textArea.setSelectionRange(0, 999999);
+  document.execCommand("copy");
+  highlightDiv.removeChild(textArea);
+}
+
+document
+  .querySelectorAll("pre")
+  .forEach((highlightDiv) => ccb(highlightDiv));