fix some bugs

src/main.ts

@@ -12,6 +12,7 @@ export async function init(hexo: Hexo) {
       line_number: false,
       strip_indent: true,
       tab_replace: "  ",
+      pre_style: true,
       additional: {
         langs: [],
         lang_alias: {},
@@ -47,10 +48,14 @@ export async function init(hexo: Hexo) {
   const hexoHighlighter = (code: string, options: HighlightOptions) => {
     var code = config.strip_indent ? (stripIndent(code) as string) : code;
     code = config.tab_replace ? code.replace(/\t/g, config.tab_replace) : code;
+
+    // 处理代码语言
     let lang = options.lang;
     if (!lang || !supportedLanguages[lang]) {
       lang = "text";
     }
+
+    // 处理代码块语法高亮
     let pre = "";
     const transformer = (): ShikiTransformer => {
       return {
@@ -74,25 +79,43 @@ export async function init(hexo: Hexo) {
           themes: config.theme,
           transformers: [transformer()],
         });
-      pre = pre.replace(/<pre[^>]*>/, "<pre>");
+      // 删除多余内容
+      pre = pre.replace(/<pre[^>]*>/, (match) => {
+        if (config.pre_style) return match.replace(/\s*tabindex="0"/, "");
+        return match.replace(/\s*style\s*=\s*"[^"]*"\s*tabindex="0"/, "");
+      });
       pre = pre.replace(/<\/?code>/, "");
     } catch (error) {
       console.warn(error);
       pre = htmlTag("pre", {}, code);
     }
 
+    // 处理行号
     let numbers = "";
-    if (config.line_number) {
+    const show_line_number =
-      for (let i = 0, len = code.split("\n").length; i < len; i++) {
+      config.line_number && // 设置中显示行号
-        numbers += htmlTag("span", { class: "line" }, `${1 + i}`, false) + "<br>";
+      (options.line_number || true) && // 代码块中未设置不显示行号
+      (options.line_threshold || 0) < options.lines_length; // 代码行数超过阈值
+    if (show_line_number) {
+      const firstLine = options.firstLine || 1
+      for (let i = firstLine, len = code.split("\n").length + firstLine; i < len; i++) {
+        numbers += htmlTag("span", { class: "line" }, `${i}`, false) + "<br>";
       }
       numbers = htmlTag("pre", {}, numbers, false);
     }
+
+    // 处理标题与链接
+    const caption = options.caption ? htmlTag("figcaption", {}, options.caption, false) : "";
+
+    // 处理包裹标签
     const td_code = htmlTag("td", { class: "code" }, pre, false);
-    const td_gutter = htmlTag("td", { class: "gutter" }, numbers, false);
+    const td_gutter = numbers.length > 0 ? htmlTag("td", { class: "gutter" }, numbers, false) : "";
+
+    // 合并标签
     const html = htmlTag(
       "figure",
       { class: `highlight ${lang}` },
+      caption +
         htmlTag(
           "table",
           {},