add os::windows::symlink_{dir,file}

src/fs/mod.rs

@@ -3,11 +3,13 @@
 //! This module is an async version of [`std::fs`].
 //!
 //! [`os::unix::fs`]: ../os/unix/fs/index.html
+//! [`os::windows::fs`]: ../os/windows/fs/index.html
 //! [`std::fs`]: https://doc.rust-lang.org/std/fs/index.html
 //!
 //! # Platform-specific extensions
 //!
 //! * Unix: use the [`os::unix::fs`] module.
+//! * Windows: use the [`os::windows::fs`] module.
 //!
 //! # Examples
 //!

src/os/windows/fs.rs

@@ -0,0 +1,55 @@
+//! Windows-specific filesystem extensions.
+
+use crate::io;
+use crate::path::Path;
+use crate::task::spawn_blocking;
+
+/// Creates a new directory symbolic link on the filesystem.
+///
+/// The `dst` path will be a directory symbolic link pointing to the `src` path.
+///
+/// This function is an async version of [`std::os::windows::fs::symlink_dir`].
+///
+/// [`std::os::windows::fs::symlink_dir`]: https://doc.rust-lang.org/std/os/windows/fs/fn.symlink_dir.html
+///
+/// # Examples
+///
+/// ```no_run
+/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
+/// #
+/// use async_std::os::windows::fs::symlink_dir;
+///
+/// symlink_dir("a", "b").await?;
+/// #
+/// # Ok(()) }) }
+/// ```
+pub async fn symlink_dir<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> io::Result<()> {
+    let src = src.as_ref().to_owned();
+    let dst = dst.as_ref().to_owned();
+    spawn_blocking(move || std::os::windows::fs::symlink_dir(&src, &dst)).await
+}
+
+/// Creates a new file symbolic link on the filesystem.
+///
+/// The `dst` path will be a file symbolic link pointing to the `src` path.
+///
+/// This function is an async version of [`std::os::windows::fs::symlink_file`].
+///
+/// [`std::os::windows::fs::symlink_file`]: https://doc.rust-lang.org/std/os/windows/fs/fn.symlink_file.html
+///
+/// # Examples
+///
+/// ```no_run
+/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
+/// #
+/// use async_std::os::windows::fs::symlink_file;
+///
+/// symlink_file("a.txt", "b.txt").await?;
+/// #
+/// # Ok(()) }) }
+/// ```
+pub async fn symlink_file<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> io::Result<()> {
+    let src = src.as_ref().to_owned();
+    let dst = dst.as_ref().to_owned();
+    spawn_blocking(move || std::os::windows::fs::symlink_file(&src, &dst)).await
+}

src/os/windows/mod.rs

@@ -3,3 +3,7 @@
 cfg_std! {
     pub mod io;
 }
+
+cfg_default! {
+    pub mod fs;
+}