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How to get crate version in Rust?

Cargo does pass some metadata to the compiler through environment variables. The compiler environment is populated by fill_env in Cargo's code. This code has become more complex since earlier versions, and the entire list of variables is no longer obvious from it because it can be dynamic.

Below is a set of variables available:
CARGO_MANIFEST_DIR
CARGO_PKG_AUTHORS
CARGO_PKG_DESCRIPTION
CARGO_PKG_HOMEPAGE
CARGO_PKG_NAME
CARGO_PKG_REPOSITORY
CARGO_PKG_VERSION
CARGO_PKG_VERSION_MAJOR
CARGO_PKG_VERSION_MINOR
CARGO_PKG_VERSION_PATCH
CARGO_PKG_VERSION_PRE

You can access environment variables using the env!() macro. If you want you compiler to compile without Cargo you can use option_env!()

How to get Cargo version:

fn main() {
    const VERSION: &'static str = env!("CARGO_PKG_VERSION");
    const OPTION_VERSION: Option<&'static str> = option_env!("CARGO_PKG_VERSION");

    
    println!("MyProgram v{}", VERSION);
    println!("MyProgram v{}", OPTION_VERSION.unwrap_or("unknown"));
}

Conclusion

In this page (written and validated by ) you learned about How to get crate version in Rust? . What's Next? If you are interested in completing Rust tutorial, we encourage you simply to start here: Rust Tutorial.



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