whatever.rs

pub fn copy_with_progress<R: ?Sized, W: ?Sized>(
    progress: &ProgressBar,
    reader: &mut R,
    writer: &mut W,
) -> io::Result<u64>
where
    R: Read,
    W: Write,
{
    let mut buf = [0; 262144];
    let mut written = 0;
    loop {
        let len = match reader.read(&mut buf) {
            Ok(0) => return Ok(written),
            Ok(len) => len,
            Err(ref e) if e.kind() == io::ErrorKind::Interrupted => continue,
            Err(e) => return Err(e),
        };
        writer.write_all(&buf[..len])?;
        written += len as u64;
        progress.inc(len as u64);
    }
}