Vendor dependencies

Let's see how I like this workflow.

vendor/tokio/src/io/stdin.rs

@@ -0,0 +1,73 @@
+use crate::io::blocking::Blocking;
+use crate::io::{AsyncRead, ReadBuf};
+
+use std::io;
+use std::pin::Pin;
+use std::task::Context;
+use std::task::Poll;
+
+cfg_io_std! {
+    /// A handle to the standard input stream of a process.
+    ///
+    /// The handle implements the [`AsyncRead`] trait, but beware that concurrent
+    /// reads of `Stdin` must be executed with care.
+    ///
+    /// This handle is best used for non-interactive uses, such as when a file
+    /// is piped into the application. For technical reasons, `stdin` is
+    /// implemented by using an ordinary blocking read on a separate thread, and
+    /// it is impossible to cancel that read. This can make shutdown of the
+    /// runtime hang until the user presses enter.
+    ///
+    /// For interactive uses, it is recommended to spawn a thread dedicated to
+    /// user input and use blocking IO directly in that thread.
+    ///
+    /// Created by the [`stdin`] function.
+    ///
+    /// [`stdin`]: fn@stdin
+    /// [`AsyncRead`]: trait@AsyncRead
+    #[derive(Debug)]
+    pub struct Stdin {
+        std: Blocking<std::io::Stdin>,
+    }
+
+    /// Constructs a new handle to the standard input of the current process.
+    ///
+    /// This handle is best used for non-interactive uses, such as when a file
+    /// is piped into the application. For technical reasons, `stdin` is
+    /// implemented by using an ordinary blocking read on a separate thread, and
+    /// it is impossible to cancel that read. This can make shutdown of the
+    /// runtime hang until the user presses enter.
+    ///
+    /// For interactive uses, it is recommended to spawn a thread dedicated to
+    /// user input and use blocking IO directly in that thread.
+    pub fn stdin() -> Stdin {
+        let std = io::stdin();
+        Stdin {
+            std: Blocking::new(std),
+        }
+    }
+}
+
+#[cfg(unix)]
+impl std::os::unix::io::AsRawFd for Stdin {
+    fn as_raw_fd(&self) -> std::os::unix::io::RawFd {
+        std::io::stdin().as_raw_fd()
+    }
+}
+
+#[cfg(windows)]
+impl std::os::windows::io::AsRawHandle for Stdin {
+    fn as_raw_handle(&self) -> std::os::windows::io::RawHandle {
+        std::io::stdin().as_raw_handle()
+    }
+}
+
+impl AsyncRead for Stdin {
+    fn poll_read(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut ReadBuf<'_>,
+    ) -> Poll<io::Result<()>> {
+        Pin::new(&mut self.std).poll_read(cx, buf)
+    }
+}