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//! Example Panic Unwind
//!
//! > This example introduces how to catch Panic in the Mingling program loop
//!
//! Run:
//! ```bash
//! cargo run --manifest-path examples/example-panic-unwind/Cargo.toml --quiet -- panic
//! cargo run --manifest-path examples/example-panic-unwind/Cargo.toml --quiet -- panic OhMyGod
//! ```
//!
//! Output:
//! ```plaintext
//! Program not panic
//! Program panic: OhMyGod
//! OhMyGod
//! ```
use mingling::{hook::ProgramHook, prelude::*};
dispatcher!("panic", CMDPanic => EntryPanic);
pack!(NotPanic = ());
fn main() {
let mut program = ThisProgram::new();
program.with_dispatcher(CMDPanic);
// --------- IMPORTANT ---------
// Enable silence_panic to suppress automatic Panic output
program.stdout_setting.silence_panic = true;
// Define a hook to output &ProgramPanic when a Panic occurs
program.with_hook(ProgramHook::empty().on_exec_panic(|info| println!("Program panic: {info}")));
// --------- IMPORTANT ---------
let _ = program.exec();
}
#[chain]
fn handle_panic(prev: EntryPanic) -> Next {
let panic_info = prev.pick::<Option<String>>(()).unpack();
match panic_info {
Some(s) => {
// Panic happens here, will be caught
panic!("{}", s)
}
None => NotPanic::default(),
}
}
/// Renders the message when no panic occurs.
#[renderer]
fn render(_: NotPanic) {
r_println!("Program not panic");
}
gen_program!();
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