mini_exercism 8.0.0

Minimalistic Rust library to interact with the Exercism.org APIs
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use std::env;
use std::path::PathBuf;

pub fn get_cli_config_dir() -> Option<PathBuf> {
    // Based on:
    // https://github.com/exercism/cli/blob/9e1285b62502f3f5a4a896a44e540ee1bee5c1bf/config/config.go#L62-L72

    let mut path: PathBuf;

    if let Some(config_home) = env::var_os("EXERCISM_CONFIG_HOME") {
        path = config_home.into();
    } else {
        if let Some(config_home) = env::var_os("XDG_CONFIG_HOME") {
            path = config_home.into();
        } else {
            path = env::var_os("HOME")?.into();
            path.push(".config");
        }
        path.push("exercism");
    }

    Some(path)
}

#[cfg(test)]
#[cfg_attr(coverage_nightly, coverage(off))]
mod tests {
    use super::*;

    mod get_cli_config_dir {
        use std::path::MAIN_SEPARATOR;

        use serial_test::serial;

        use super::*;

        #[test]
        #[serial(env_tests)]
        fn test_from_exercism_config_home() {
            let exercism_config_home = "/some/config/home";
            unsafe {
                env::set_var("EXERCISM_CONFIG_HOME", exercism_config_home);
            }
            let config_dir = get_cli_config_dir();

            assert_eq!(config_dir, Some(exercism_config_home.into()));
        }

        #[test]
        #[serial(env_tests)]
        fn test_from_xdg_config_home() {
            let xdg_config_home = "/some/config/home";
            unsafe {
                env::remove_var("EXERCISM_CONFIG_HOME");
                env::set_var("XDG_CONFIG_HOME", xdg_config_home);
            }
            let config_dir = get_cli_config_dir();

            assert_eq!(
                config_dir,
                Some(format!("{}{}{}", xdg_config_home, MAIN_SEPARATOR, "exercism").into())
            );
        }

        #[test]
        #[serial(env_tests)]
        fn test_from_home() {
            let home = "/some/home";
            unsafe {
                env::remove_var("EXERCISM_CONFIG_HOME");
                env::remove_var("XDG_CONFIG_HOME");
                env::set_var("HOME", home);
            }
            let config_dir = get_cli_config_dir();

            assert_eq!(
                config_dir,
                Some(
                    format!(
                        "{}{}{}{}{}",
                        home, MAIN_SEPARATOR, ".config", MAIN_SEPARATOR, "exercism"
                    )
                    .into()
                )
            );
        }

        #[test]
        #[serial(env_tests)]
        fn test_invalid() {
            unsafe {
                env::remove_var("EXERCISM_CONFIG_HOME");
                env::remove_var("XDG_CONFIG_HOME");
                env::remove_var("HOME");
            }
            let config_dir = get_cli_config_dir();

            assert!(config_dir.is_none());
        }
    }
}