fix: 修复 WSL 会话 Linux 路径解析 (#399)

src/session-path.ts

@@ -0,0 +1,37 @@
+import { win32 } from 'node:path'
+
+/** `\\wsl.localhost\<distro>` root of a Windows-hosted WSL workspace. */
+const WSL_LOCALHOST_ROOT = /^\\\\wsl\.localhost\\([^\\]+)(?:\\|$)/i
+
+/**
+ * Reinterpret an already-absolute path in the namespace of one session.
+ *
+ * Windows treats `/foo` as rooted on the current drive, so `path.resolve()`
+ * turns it into e.g. `C:\\foo`. That is wrong for a session whose cwd is a
+ * WSL UNC path: in that namespace `/foo` means the distro's Linux `/foo`.
+ * Project only that unambiguous combination onto the matching distro root;
+ * drive paths, UNC paths, ordinary Windows sessions and non-Windows hosts
+ * keep their existing semantics.
+ *
+ * Workspace containment is intentionally NOT handled here. A projected path
+ * such as `/tmp/x` can still be rejected later for lying outside the session
+ * workspace; the important part is that it is checked as WSL `/tmp/x`, not
+ * silently redirected to `C:\\tmp\\x`.
+ */
+export function resolveSessionPath(
+  cwd: string,
+  target: string,
+  platform: NodeJS.Platform = process.platform,
+): string {
+  if (platform !== 'win32' || !/^\/(?!\/)/.test(target)) return target
+
+  // Session cwd can be spelled with either separator style. Normalize only
+  // for detection; the returned host path is always canonical win32 UNC.
+  const normalizedCwd = cwd.replace(/\//g, '\\')
+  const match = WSL_LOCALHOST_ROOT.exec(normalizedCwd)
+  if (match === null) return target
+
+  const distroRoot = `\\\\wsl.localhost\\${match[1]}`
+  const relative = target.slice(1).replace(/\//g, '\\')
+  return win32.resolve(distroRoot, relative)
+}