Function is_stale

build.py:82–94

Checks if the target file is older than any source file.

(target: Path, sources: List[Path])

    cwd_str = f" (in {cwd})" if cwd else ""
    print(f"{Colors.YELLOW}▶️  Running: {' '.join(cmd)}{cwd_str}{Colors.RESET}")
    try:
        proc = subprocess.run(
            cmd, 
            cwd=cwd, 
            check=check,
            stdout=sys.stdout, # Stream output directly
            stderr=sys.stderr
        )
        return proc
    except FileNotFoundError as e:
        print(f"{Colors.RED}❌ Error: Command '{cmd[0]}' not found. Is it in your PATH?{Colors.RESET}")
        print(f"   Details: {e}")
        sys.exit(1)
    except subprocess.CalledProcessError as e:
        print(f"{Colors.RED}❌ Command failed with exit code {e.returncode}.{Colors.RESET}")
        sys.exit(e.returncode)