fix: misc

src/components/FileTree.tsx

@@ -2,6 +2,15 @@ import { Component, createMemo, createSignal, Show } from "solid-js";
 import { type FileNode, type TocNode } from "../data-loader";
 import { useNavigate } from "@solidjs/router";
 
+/**
+ * 检查当前文件路径是否在文件夹内
+ */
+function isPathInDir(currentPath: string, dirPath: string): boolean {
+  // 确保 dirPath 以 / 结尾，用于前缀匹配
+  const dirPathPrefix = dirPath.endsWith('/') ? dirPath : dirPath + '/';
+  return currentPath.startsWith(dirPathPrefix);
+}
+
 /**
  * 文件树节点组件
  */
@@ -13,9 +22,10 @@ export const FileTreeNode: Component<{
   onClose: () => void;
 }> = (props) => {
   const navigate = useNavigate();
-  const [isExpanded, setIsExpanded] = createSignal(true);
   const isDir = !!props.node.children;
   const isActive = createMemo(() => props.currentPath === props.node.path);
+  // 默认收起，除非当前文件在该文件夹内
+  const [isExpanded, setIsExpanded] = createSignal(isDir && isPathInDir(props.currentPath, props.node.path));
 
   const handleClick = () => {
     if (isDir) {