tuna

Tuna is a tool for managing CVARs during game development, as a set of global global variables, on which manipulation can be built.

At the core, the goal of tuna is to be easy to use, while avoiding unsafe code.

This is how you use it:

extern crate tuna;

const ENABLE_LOGGING: tuna::Boolean = tuna::Boolean::new("logging", "enable", false);

fn main() {
    ENABLE_LOGGING.register();

    for i in 0..10 {
	    eprintln!("xx");
        if (ENABLE_LOGGING.read()) {
            eprintln!("looping once");
        }
		if i == 5 {
		    ENABLE_LOGGING.write(true);
		}
    }
}

The register call can be omitted, at some performance cost during the first read.

There's also a utility macro to create a category more easily:

extern crate tuna;

#[tuna::tuna]
mod logging {
	pub(super) const ENABLE: bool = false;
}

fn main() {
    logging::register();

    for i in 0..10 {
        if (logging::ENABLE.read()) {
            eprintln!("looping once");
        }

		if i == 5 {
		    logging::ENABLE.write(true);
		}
    }
}

Note that tuna is a work in progress! I'm working on it due to a need, but I want to dogfood it while I build it - not build a whole thing on its own.

Alternatives:

• cvar - much more customizable, less batteries-included