Function parse_opts

src/settings.rs:208–437

Create settings by examining command line arguments and environment variables.

()

/// Create settings by examining command line arguments and environment
/// variables.
pub fn parse_opts() -> Result<(Settings, RunMode), lexopt::Error> {
    let (args, mode, argv) = parse_args()?;

    let mut settings = Settings::default();
    settings.isolated = args.isolate;
    settings.ignore_environment = settings.isolated || args.ignore_environment;
    settings.bytes_warning = args.bytes_warning.into();
    settings.import_site = !args.no_site;

    let ignore_environment = settings.ignore_environment;

    if !ignore_environment {
        settings.path_list.extend(get_paths("RUSTPYTHONPATH"));
        settings.path_list.extend(get_paths("PYTHONPATH"));
    }

    // Now process command line flags:

    let get_env = |env| (!ignore_environment).then(|| env::var_os(env)).flatten();

    let env_count = |env| {
        get_env(env).filter(|v| !v.is_empty()).map_or(0, |val| {
            val.to_str().and_then(|v| v.parse::<u8>().ok()).unwrap_or(1)
        })
    };

    settings.optimize = cmp::max(args.optimize, env_count("PYTHONOPTIMIZE"));
    settings.verbose = cmp::max(args.verbose, env_count("PYTHONVERBOSE"));
    settings.debug = cmp::max(args.debug, env_count("PYTHONDEBUG"));

    let env_bool = |env| get_env(env).is_some_and(|v| !v.is_empty());

    settings.user_site_directory =
        !(settings.isolated || args.no_user_site || env_bool("PYTHONNOUSERSITE"));
    settings.quiet = args.quiet;
    settings.write_bytecode = !(args.dont_write_bytecode || env_bool("PYTHONDONTWRITEBYTECODE"));
    settings.safe_path = settings.isolated || args.safe_path || env_bool("PYTHONSAFEPATH");
    settings.inspect = args.inspect || env_bool("PYTHONINSPECT");
    settings.interactive = args.inspect;
    settings.buffered_stdio = !args.unbuffered;

    if let Some(val) = get_env("PYTHONINTMAXSTRDIGITS") {
        settings.int_max_str_digits = match val.to_str().and_then(|s| s.parse().ok()) {
            Some(digits @ (0 | 640..)) => digits,
            _ => {
                error!(
                    "Fatal Python error: config_init_int_max_str_digits: PYTHONINTMAXSTRDIGITS: invalid limit; must be >= 640 or 0 for unlimited.\nPython runtime state: preinitialized"
                );
                std::process::exit(1);
            }
        };
    }

    settings.check_hash_pycs_mode = args.check_hash_based_pycs;

    if let Some(val) = get_env("PYTHONUTF8")
        && let Some(val_str) = val.to_str()
        && !val_str.is_empty()