let config_location = env::var("TN_CONFIG");
    let cfg_str = match &config_location {

    let cfg_str = match env::var("TN_CONFIG") {

        Err(_) => "/home/frank/.tn",

        Err(_) => String::from("/home/frank/.tn"),

    if let Ok(cfg) = read_config(cfg_str) {

    if let Ok(cfg) = read_config(&cfg_str) {