pnc 0.1.0

A fast, fully offline, terminal-only reverse Polish notation (RPN) calculator
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use crossterm::cursor::{Hide, Show};
use crossterm::terminal::{
    disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen,
};
use std::io::{self, stdout};
use std::panic;
use std::sync::Mutex;
use tracing::info;
use tracing_appender::non_blocking::WorkerGuard;

static LOG_GUARD: Mutex<Option<WorkerGuard>> = Mutex::new(None);

pub fn set_log_guard(guard: WorkerGuard) {
    *LOG_GUARD.lock().unwrap() = Some(guard);
}

pub fn flush_log() {
    if let Some(guard) = LOG_GUARD.lock().unwrap().take() {
        drop(guard);
    }
}

pub fn install_panic_hook() {
    let original = panic::take_hook();
    panic::set_hook(Box::new(move |info| {
        tracing::error!(target: "pnc::panic", payload = %info);
        flush_log();
        let _ = restore();
        original(info);
    }));
}

pub fn init() -> io::Result<()> {
    enable_raw_mode()?;
    crossterm::execute!(stdout(), EnterAlternateScreen, Hide)?;
    info!(target: "pnc::terminal", "terminal initialized");
    Ok(())
}

pub fn restore() -> io::Result<()> {
    disable_raw_mode()?;
    crossterm::execute!(stdout(), Show, LeaveAlternateScreen)?;
    info!(target: "pnc::terminal", "terminal restored");
    Ok(())
}