eyre/examples/panic_compose.rs

use color_eyre::eyre::Report;
use tracing::instrument;

#[instrument]
fn main() -> Result<(), Report> {
    #[cfg(feature = "capture-spantrace")]
    install_tracing();

    let (panic_hook, eyre_hook) = color_eyre::config::HookBuilder::default()
        .into_hooks()
        .expect("failed to setup hooks");

    eyre_hook.install()?;

    std::panic::set_hook(Box::new(move |pi| {
        tracing::error!("{}", panic_hook.panic_report(pi));
    }));

    read_config();

    Ok(())
}

#[cfg(feature = "capture-spantrace")]
fn install_tracing() {
    use tracing_error::ErrorLayer;
    use tracing_subscriber::prelude::*;
    use tracing_subscriber::{fmt, EnvFilter};

    let fmt_layer = fmt::layer().with_target(false);
    let filter_layer = EnvFilter::try_from_default_env()
        .or_else(|_| EnvFilter::try_new("info"))
        .unwrap();

    tracing_subscriber::registry()
        .with(filter_layer)
        .with(fmt_layer)
        .with(ErrorLayer::default())
        .init();
}

#[instrument]
fn read_file(path: &str) {
    if let Err(e) = std::fs::read_to_string(path) {
        panic!("{}", e);
    }
}

#[instrument]
fn read_config() {
    read_file("fake_file")
}