Crate feature_check

Query a program for supported features.

The obtain::obtain_features function queries a program for the features that it supports via various methods (e.g. running it with the --features command-line option) and allows other programs to check for the presence and, possibly, versions of specific features.

use feature_check::defs;
use feature_check::obtain;

match obtain::obtain_features(&defs::Config {
    program: "confget".to_string(),
    ..defs::Config::default()
})? {
    defs::Obtained::NotSupported => eprintln!("Feature query not supported"),
    defs::Obtained::Failed(err) => eprintln!("Could not query for features: {}", err),
    defs::Obtained::Features(res) => {
        let mut features: Vec<&String> = res.keys().collect();
        features.sort_unstable();
        for name in &features {
            println!("{}", name);
        }
    }
}

Modules

defs	Common definitions for the feature-check crate’s modules.
expr	Check whether the program’s features satisfy the specified condition.
obtain	Query a program for its features.
version	Parse version strings and compare them.