1use backtrace::{Backtrace, BacktraceFmt, BytesOrWideString};
 2use smol::future::FutureExt;
 3use std::{fmt, future::Future, time::Duration};
 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
23pub struct CwdBacktrace<'a>(pub &'a Backtrace);
24
25impl<'a> std::fmt::Debug for CwdBacktrace<'a> {
26    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> std::fmt::Result {
27        let cwd = std::env::current_dir().unwrap();
28        let cwd = cwd.parent().unwrap();
29        let mut print_path = |fmt: &mut fmt::Formatter<'_>, path: BytesOrWideString<'_>| {
30            fmt::Display::fmt(&path, fmt)
31        };
32        let mut fmt = BacktraceFmt::new(f, backtrace::PrintFmt::Full, &mut print_path);
33        for frame in self.0.frames() {
34            let mut formatted_frame = fmt.frame();
35            if frame
36                .symbols()
37                .iter()
38                .any(|s| s.filename().map_or(false, |f| f.starts_with(&cwd)))
39            {
40                formatted_frame.backtrace_frame(frame)?;
41            }
42        }
43        fmt.finish()
44    }
45}