1use smol::future::FutureExt;
 2use std::{future::Future, time::Duration};
 3pub use util::*;
 4
 5pub fn post_inc(value: &mut usize) -> usize {
 6    let prev = *value;
 7    *value += 1;
 8    prev
 9}
10
11pub async fn timeout<F, T>(timeout: Duration, f: F) -> Result<T, ()>
12where
13    F: Future<Output = T>,
14{
15    let timer = async {
16        smol::Timer::after(timeout).await;
17        Err(())
18    };
19    let future = async move { Ok(f.await) };
20    timer.race(future).await
21}
22
23#[cfg(any(test, feature = "test-support"))]
24pub struct CwdBacktrace<'a>(pub &'a backtrace::Backtrace);
25
26#[cfg(any(test, feature = "test-support"))]
27impl<'a> std::fmt::Debug for CwdBacktrace<'a> {
28    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
29        use backtrace::{BacktraceFmt, BytesOrWideString};
30
31        let cwd = std::env::current_dir().unwrap();
32        let cwd = cwd.parent().unwrap();
33        let mut print_path = |fmt: &mut std::fmt::Formatter<'_>, path: BytesOrWideString<'_>| {
34            std::fmt::Display::fmt(&path, fmt)
35        };
36        let mut fmt = BacktraceFmt::new(f, backtrace::PrintFmt::Full, &mut print_path);
37        for frame in self.0.frames() {
38            let mut formatted_frame = fmt.frame();
39            if frame
40                .symbols()
41                .iter()
42                .any(|s| s.filename().map_or(false, |f| f.starts_with(&cwd)))
43            {
44                formatted_frame.backtrace_frame(frame)?;
45            }
46        }
47        fmt.finish()
48    }
49}