feat: improve compatibility of the copy code feature (#28)

优化复制代码功能的兼容性。

```release-note
优化复制代码功能的兼容性。
```

src/main/java/run/halo/highlightjs/HighlightJSHeadProcessor.java

@@ -75,8 +75,8 @@ private String highlightJsScript(BasicConfig basicConfig) {
                         <script defer src="/plugins/PluginHighlightJS/assets/static/highlight.min.js"></script>
 
                         <th:block th:if="${config.showCopyButton}">
-                            <link href="/plugins/PluginHighlightJS/assets/static/plugins/highlightjs-copy.min.css" rel="stylesheet"/>
-                            <script defer src="/plugins/PluginHighlightJS/assets/static/plugins/highlightjs-copy.min.js"></script>
+                            <link href="/plugins/PluginHighlightJS/assets/static/plugins/highlightjs-copy.css" rel="stylesheet"/>
+                            <script defer src="/plugins/PluginHighlightJS/assets/static/plugins/highlightjs-copy.js"></script>
                         </th:block>
 
                         <link href="/plugins/PluginHighlightJS/assets/static/plugins/override.css" rel="stylesheet"/>

src/main/resources/static/plugins/highlightjs-copy.css

@@ -0,0 +1,61 @@
+.hljs-copy-wrapper {
+    position: relative;
+    overflow: hidden;
+}
+.hljs-copy-wrapper:hover .hljs-copy-button,
+.hljs-copy-button:focus {
+    transform: translateX(0);
+}
+.hljs-copy-button {
+    position: absolute;
+    transform: translateX(calc(100% + 1.125em));
+    top: 0.5em;
+    right: 0.5em;
+    width: 2rem;
+    height: 2rem;
+    text-indent: -9999px;
+    color: var(--hljs-theme-color);
+    border-radius: 0.25rem;
+    border: 1px solid;
+    border-color: color-mix(in srgb, var(--hljs-theme-color), transparent 80%);
+    background-color: var(--hljs-theme-background);
+    transition: background-color 200ms ease, transform 200ms ease-out;
+    overflow: hidden;
+}
+.hljs-copy-button:not([data-copied="true"])::before {
+    content: "";
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    position: absolute;
+    background-color: currentColor;
+    mask: url('data:image/svg+xml;utf-8,<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M6 5C5.73478 5 5.48043 5.10536 5.29289 5.29289C5.10536 5.48043 5 5.73478 5 6V20C5 20.2652 5.10536 20.5196 5.29289 20.7071C5.48043 20.8946 5.73478 21 6 21H18C18.2652 21 18.5196 20.8946 18.7071 20.7071C18.8946 20.5196 19 20.2652 19 20V6C19 5.73478 18.8946 5.48043 18.7071 5.29289C18.5196 5.10536 18.2652 5 18 5H16C15.4477 5 15 4.55228 15 4C15 3.44772 15.4477 3 16 3H18C18.7956 3 19.5587 3.31607 20.1213 3.87868C20.6839 4.44129 21 5.20435 21 6V20C21 20.7957 20.6839 21.5587 20.1213 22.1213C19.5587 22.6839 18.7957 23 18 23H6C5.20435 23 4.44129 22.6839 3.87868 22.1213C3.31607 21.5587 3 20.7957 3 20V6C3 5.20435 3.31607 4.44129 3.87868 3.87868C4.44129 3.31607 5.20435 3 6 3H8C8.55228 3 9 3.44772 9 4C9 4.55228 8.55228 5 8 5H6Z" fill="black"/><path fill-rule="evenodd" clip-rule="evenodd" d="M7 3C7 1.89543 7.89543 1 9 1H15C16.1046 1 17 1.89543 17 3V5C17 6.10457 16.1046 7 15 7H9C7.89543 7 7 6.10457 7 5V3ZM15 3H9V5H15V3Z" fill="black"/></svg>');
+    mask-repeat: no-repeat;
+    mask-size: 1rem;
+    mask-position: center center;
+}
+.hljs-copy-button:hover {
+    background-color: color-mix(in srgb, var(--hljs-theme-color), transparent 90%);
+}
+.hljs-copy-button:active {
+    border-color: color-mix(in srgb, var(--hljs-theme-color), transparent 60%);
+}
+.hljs-copy-button[data-copied="true"] {
+    text-indent: 0;
+    width: auto;
+}
+@media (prefers-reduced-motion) {
+    .hljs-copy-button {
+        transition: none;
+    }
+}
+.hljs-copy-alert {
+    clip: rect(0 0 0 0);
+    clip-path: inset(50%);
+    height: 1px;
+    overflow: hidden;
+    position: absolute;
+    white-space: nowrap;
+    width: 1px;
+}

src/main/resources/static/plugins/highlightjs-copy.js

@@ -0,0 +1,82 @@
+class CopyButtonPlugin {
+    constructor(options = {}) {
+        self.hook = options.hook;
+        self.callback = options.callback;
+        self.lang = options.lang || document.documentElement.lang || "en";
+    }
+    "after:highlightElement"({ el, text }) {
+        let button = Object.assign(document.createElement("button"), {
+            innerHTML: locales[lang]?.[0] || "Copy",
+            className: "hljs-copy-button",
+        });
+        button.dataset.copied = false;
+        el.parentElement.classList.add("hljs-copy-wrapper");
+        el.parentElement.appendChild(button);
+        el.parentElement.style.setProperty("--hljs-theme-background", window.getComputedStyle(el).backgroundColor);
+        el.parentElement.style.setProperty("--hljs-theme-color", window.getComputedStyle(el).color);
+        button.onclick = function () {
+            let newText = text;
+
+            if (hook && typeof hook === "function") {
+                newText = hook(text, el) || text;
+            }
+
+            const copyText = () => {
+                if (navigator.clipboard) {
+                    return navigator.clipboard.writeText(newText);
+                } else {
+                    const textArea = document.createElement("textarea");
+                    textArea.value = newText;
+                    textArea.style.position = "fixed";
+                    document.body.appendChild(textArea);
+                    textArea.focus();
+                    textArea.select();
+
+                    try {
+                        const successful = document.execCommand("copy");
+                        document.body.removeChild(textArea);
+                        return successful ? Promise.resolve() : Promise.reject();
+                    } catch (err) {
+                        document.body.removeChild(textArea);
+                        return Promise.reject(err);
+                    }
+                }
+            };
+
+            copyText()
+                .then(function () {
+                    button.innerHTML = locales[lang]?.[1] || "Copied!";
+                    button.dataset.copied = true;
+                    let alert = Object.assign(document.createElement("div"), {
+                        role: "status",
+                        className: "hljs-copy-alert",
+                        innerHTML: locales[lang]?.[2] || "Copied to clipboard",
+                    });
+                    el.parentElement.appendChild(alert);
+                    setTimeout(() => {
+                        button.innerHTML = locales[lang]?.[0] || "Copy";
+                        button.dataset.copied = false;
+                        el.parentElement.removeChild(alert);
+                        alert = null;
+                    }, 2e3);
+                })
+                .then(function () {
+                    if (typeof callback === "function") return callback(newText, el);
+                });
+        };
+    }
+}
+if (typeof module != "undefined") {
+    module.exports = CopyButtonPlugin;
+}
+const locales = {
+    en: ["Copy", "Copied!", "Copied to clipboard"],
+    es: ["Copiar", "¡Copiado!", "Copiado al portapapeles"],
+    fr: ["Copier", "Copié !", "Copié dans le presse-papier"],
+    de: ["Kopieren", "Kopiert!", "In die Zwischenablage kopiert"],
+    ja: ["コピー", "コピーしました！", "クリップボードにコピーしました"],
+    ko: ["복사", "복사됨!", "클립보드에 복사됨"],
+    ru: ["Копировать", "Скопировано!", "Скопировано в буфер обмена"],
+    zh: ["复制", "已复制!", "已复制到剪贴板"],
+    "zh-tw": ["複製", "已複製!", "已複製到剪貼簿"],
+};