1 files changed, 60 insertions, 0 deletions
diff --git a/third_party/rust/tokio-stream/src/wrappers/lines.rs b/third_party/rust/tokio-stream/src/wrappers/lines.rs
new file mode 100644
index 0000000000..ad3c25349f
--- /dev/null
+++ b/third_party/rust/tokio-stream/src/wrappers/lines.rs
@@ -0,0 +1,60 @@
+use crate::Stream;
+use pin_project_lite::pin_project;
+use std::io;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+use tokio::io::{AsyncBufRead, Lines};
+
+pin_project! {
+    /// A wrapper around [`tokio::io::Lines`] that implements [`Stream`].
+    ///
+    /// [`tokio::io::Lines`]: struct@tokio::io::Lines
+    /// [`Stream`]: trait@crate::Stream
+    #[derive(Debug)]
+    #[cfg_attr(docsrs, doc(cfg(feature = "io-util")))]
+    pub struct LinesStream<R> {
+        #[pin]
+        inner: Lines<R>,
+    }
+}
+
+impl<R> LinesStream<R> {
+    /// Create a new `LinesStream`.
+    pub fn new(lines: Lines<R>) -> Self {
+        Self { inner: lines }
+    }
+
+    /// Get back the inner `Lines`.
+    pub fn into_inner(self) -> Lines<R> {
+        self.inner
+    }
+
+    /// Obtain a pinned reference to the inner `Lines<R>`.
+    #[allow(clippy::wrong_self_convention)] // https://github.com/rust-lang/rust-clippy/issues/4546
+    pub fn as_pin_mut(self: Pin<&mut Self>) -> Pin<&mut Lines<R>> {
+        self.project().inner
+    }
+}
+
+impl<R: AsyncBufRead> Stream for LinesStream<R> {
+    type Item = io::Result<String>;
+
+    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        self.project()
+            .inner
+            .poll_next_line(cx)
+            .map(Result::transpose)
+    }
+}
+
+impl<R> AsRef<Lines<R>> for LinesStream<R> {
+    fn as_ref(&self) -> &Lines<R> {
+        &self.inner
+    }
+}
+
+impl<R> AsMut<Lines<R>> for LinesStream<R> {
+    fn as_mut(&mut self) -> &mut Lines<R> {
+        &mut self.inner
+    }
+}