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use std::io::Write;
pub static mut GLORE: Option<&mut Write> = None;
pub fn init(w: impl Write + 'static) {
unsafe {
let l = Box::new(w);
let leaked = Box::leak(l);
GLORE = Some(leaked);
}
}
#[macro_export]
macro_rules! log {
($($arg:tt)*) => (
std::sync::Once::new().call_once(||{
use crate::GLORE;
unsafe {
if let Some(writer) = GLORE.as_mut() {
match writeln!(writer, "{}", format_args!($($arg)*)) {
Ok(_) => (),
Err(e) => {panic!("Error writing to logger\nreason: {}", e);}
}
} else {
panic!("Nothing to log to yet, use init() before logging");
}
}
});
);
}
#[cfg(test)]
mod tests {
use super::{init, log};
#[test]
fn it_works() {
let f = std::fs::OpenOptions::new()
.append(true)
.open("log.txt")
.unwrap();
let stdout = std::io::stdout();
init(stdout);
log!("hello ====");
log!("world");
init(f);
log!("hello ====");
let _ = std::thread::spawn(|| {
log!("world");
})
.join();
}
}