sema-core 1.13.0

Core types and environment for the Sema programming language
Documentation 
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use std::path::PathBuf;

/// Returns the sema home directory.
/// Resolution: $SEMA_HOME > $HOME/.sema > %USERPROFILE%\.sema > .sema
pub fn sema_home() -> PathBuf {
    if let Ok(p) = std::env::var("SEMA_HOME") {
        return PathBuf::from(p);
    }
    if let Ok(home) = std::env::var("HOME").or_else(|_| std::env::var("USERPROFILE")) {
        return PathBuf::from(home).join(".sema");
    }
    PathBuf::from(".sema")
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_sema_home_from_env_var() {
        // Run in a fresh thread so env manipulation is isolated
        std::thread::spawn(|| {
            std::env::set_var("SEMA_HOME", "/custom/sema");
            let p = sema_home();
            std::env::remove_var("SEMA_HOME");
            assert_eq!(p, PathBuf::from("/custom/sema"));
        })
        .join()
        .unwrap();
    }

    #[test]
    fn test_sema_home_default_uses_home_dir() {
        std::thread::spawn(|| {
            std::env::remove_var("SEMA_HOME");
            // HOME is expected to be set in normal environments
            if std::env::var("HOME").is_ok() || std::env::var("USERPROFILE").is_ok() {
                let p = sema_home();
                assert!(
                    p.to_string_lossy().ends_with(".sema"),
                    "expected path ending in .sema, got: {}",
                    p.display()
                );
            }
        })
        .join()
        .unwrap();
    }
}