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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>`.
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
}
}