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//! A micro-crate to enhance panic messages with context info.
//!
//! FIXME: upstream to <https://github.com/kriomant/panic-context> ?
use std::{cell::RefCell, panic, sync::Once};
pub fn enter(context: String) -> PanicContext {
static ONCE: Once = Once::new();
ONCE.call_once(PanicContext::init);
with_ctx(|ctx| ctx.push(context));
PanicContext { _priv: () }
}
#[must_use]
pub struct PanicContext {
_priv: (),
}
impl PanicContext {
fn init() {
let default_hook = panic::take_hook();
let hook = move |panic_info: &panic::PanicInfo<'_>| {
with_ctx(|ctx| {
if !ctx.is_empty() {
eprintln!("Panic context:");
for frame in ctx.iter() {
eprintln!("> {}\n", frame)
}
}
default_hook(panic_info)
})
};
panic::set_hook(Box::new(hook))
}
}
impl Drop for PanicContext {
fn drop(&mut self) {
with_ctx(|ctx| assert!(ctx.pop().is_some()))
}
}
fn with_ctx(f: impl FnOnce(&mut Vec<String>)) {
thread_local! {
static CTX: RefCell<Vec<String>> = RefCell::new(Vec::new());
}
CTX.with(|ctx| f(&mut *ctx.borrow_mut()))
}
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