feat: 增加代码块复制功能, resolve #241 (#324)

* feat: 增加js支持

* fix: 修正缩进，增加本地js读取

Co-authored-by: Chen Zirui <1617335718@qq.com>
Co-authored-by: Tuchuanhuhuhu <gzblog@hdu.edu.cn>
Co-authored-by: mzlegion <mzhao.ouo@gmail.com>

* feat: 增加代码块复制功能

---------

Co-authored-by: Chen Zirui <1617335718@qq.com>
Co-authored-by: Tuchuanhuhuhu <gzblog@hdu.edu.cn>
Co-authored-by: mzlegion <mzhao.ouo@gmail.com>

ChuanhuChatbot.py

@@ -434,6 +434,7 @@ logging.info(
 demo.title = "川虎ChatGPT 🚀"
 
 if __name__ == "__main__":
+    reload_javascript()
     # if running in Docker
     if dockerflag:
         if authflag:

assets/Kelpy-Codos.js

@@ -0,0 +1,76 @@
+// ==UserScript==
+// @name         Kelpy Codos
+// @namespace    https://github.com/Keldos-Li/Kelpy-Codos
+// @version      1.0.5
+// @author       Keldos; https://keldos.me/
+// @description  Add copy button to PRE tags before CODE tag, for Chuanhu ChatGPT especially. 
+//               Based on Chuanhu ChatGPT version: ac04408 (2023-3-22)
+// @license      GPL-3.0
+// @grant        none
+// ==/UserScript==
+
+(function () {
+    'use strict';
+
+    function addCopyButton(pre) {
+        var code = pre.querySelector('code');
+        if (!code) {
+            return; // 如果没有找到 <code> 元素，则不添加按钮
+        }
+        var firstChild = code.firstChild;
+        if (!firstChild) {
+            return; // 如果 <code> 元素没有子节点，则不添加按钮
+        }
+        var button = document.createElement('button');
+        button.textContent = '\uD83D\uDCCE'; // 使用 📎 符号作为“复制”按钮的文本
+        button.style.position = 'relative';
+        button.style.float = 'right';
+        button.style.fontSize = '1em'; // 可选：调整按钮大小
+        button.style.background = 'none'; // 可选：去掉背景颜色
+        button.style.border = 'none'; // 可选：去掉边框
+        button.style.cursor = 'pointer'; // 可选：显示指针样式
+        button.addEventListener('click', function () {
+            var range = document.createRange();
+            range.selectNodeContents(code);
+            range.setStartBefore(firstChild); // 将范围设置为第一个子节点之前
+            var selection = window.getSelection();
+            selection.removeAllRanges();
+            selection.addRange(range);
+
+            try {
+                var success = document.execCommand('copy');
+                if (success) {
+                    button.textContent = '\u2714';
+                    setTimeout(function () {
+                        button.textContent = '\uD83D\uDCCE'; // 恢复按钮为“复制”
+                    }, 2000);
+                } else {
+                    button.textContent = '\u2716';
+                }
+            } catch (e) {
+                console.error(e);
+                button.textContent = '\u2716';
+            }
+
+            selection.removeAllRanges();
+        });
+        code.insertBefore(button, firstChild); // 将按钮插入到第一个子元素之前
+    }
+
+    function handleNewElements(mutationsList, observer) {
+        for (var mutation of mutationsList) {
+            if (mutation.type === 'childList') {
+                for (var node of mutation.addedNodes) {
+                    if (node.nodeName === 'PRE') {
+                        addCopyButton(node);
+                    }
+                }
+            }
+        }
+    }
+
+    var observer = new MutationObserver(handleNewElements);
+    observer.observe(document.documentElement, { childList: true, subtree: true });
+
+    document.querySelectorAll('pre').forEach(addCopyButton);
+})();

assets/custom.js

@@ -0,0 +1 @@
+// custom javascript here

overwrites.py

@@ -36,3 +36,20 @@ def postprocess(
     else:
         y[-1] = (convert_user(y[-1][0]), convert_mdtext(y[-1][1]))
     return y
+
+with open("./assets/custom.js", "r", encoding="utf-8") as f, open("./assets/Kelpy-Codos.js", "r", encoding="utf-8") as f2:
+    customJS = f.read()
+    kelpyCodos = f2.read()
+
+def reload_javascript():
+    print("Reloading javascript...")
+    js = f'<script>{customJS}</script><script>{kelpyCodos}</script>'
+    def template_response(*args, **kwargs):
+        res = GradioTemplateResponseOriginal(*args, **kwargs)
+        res.body = res.body.replace(b'</html>', f'{js}</html>'.encode("utf8"))
+        res.init_headers()
+        return res
+
+    gr.routes.templates.TemplateResponse = template_response
+     
+GradioTemplateResponseOriginal = gr.routes.templates.TemplateResponse