Function copy

pub fn copy<M: Send + 'static>(
    from: impl Into<PathBuf>,
    to: impl Into<PathBuf>,
    sender: &ChannelSender<M>,
    progress: impl Fn(u64, u64) -> M + Send + 'static,
    done: impl FnOnce(Result<()>) -> M + Send + 'static,
) -> Operation

Copy the file from to to, which must not exist and appears only once whole. progress hears of the bytes copied out of the total every so often.