armybox 0.3.0

A memory-safe #[no_std] BusyBox/Toybox clone in Rust - 299 Unix utilities in ~500KB
Documentation 
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//! Terminal utilities - clear, reset
//!
//! Terminal control utilities.

use crate::io;

/// clear - clear the terminal screen
pub fn clear(_argc: i32, _argv: *const *const u8) -> i32 {
    io::write_str(1, b"\x1b[H\x1b[2J");
    0
}

/// reset - reset the terminal
pub fn reset(_argc: i32, _argv: *const *const u8) -> i32 {
    io::write_str(1, b"\x1bc");
    0
}

#[cfg(test)]
mod tests {
    extern crate std;
    use std::process::Command;
    use std::path::PathBuf;

    fn get_armybox_path() -> PathBuf {
        if let Ok(path) = std::env::var("ARMYBOX_PATH") {
            return PathBuf::from(path);
        }
        let manifest_dir = std::env::var("CARGO_MANIFEST_DIR")
            .map(PathBuf::from)
            .unwrap_or_else(|_| std::env::current_dir().unwrap());
        let release = manifest_dir.join("target/release/armybox");
        if release.exists() { return release; }
        manifest_dir.join("target/debug/armybox")
    }

    #[test]
    fn test_clear_outputs_escape() {
        let armybox = get_armybox_path();
        if !armybox.exists() { return; }

        let output = Command::new(&armybox)
            .args(["clear"])
            .output()
            .unwrap();

        assert_eq!(output.status.code(), Some(0));
        // Check for escape sequence
        assert!(output.stdout.starts_with(b"\x1b[H"));
    }

    #[test]
    fn test_reset_outputs_escape() {
        let armybox = get_armybox_path();
        if !armybox.exists() { return; }

        let output = Command::new(&armybox)
            .args(["reset"])
            .output()
            .unwrap();

        assert_eq!(output.status.code(), Some(0));
        assert!(output.stdout.starts_with(b"\x1bc"));
    }
}