gistfile1.txt

use std::env;

pub fn term_features_has_p() -> bool {
    let Ok(value) = env::var("TERM_FEATURES") else {
        return false;
    };

    let mut current = String::new();

    for ch in value.chars() {
        if !ch.is_ascii_alphanumeric() {
            // Stop at first non-alphanumeric per spec
            break;
        }
        if ch.is_ascii_uppercase() {
            if current == "P" {
                return true;
            }
            current.clear();
            current.push(ch);
        } else {
            current.push(ch);
        }
    }

    current == "P"
}

fn main() {
    if term_features_has_p() {
        println!("PROGRESS feature detected");
    } else {
        println!("PROGRESS feature not detected");
    }
}