use regex::{Captures, Regex};

pub fn replace<F>( text: &str, replacer: F ) -> String where F: Fn(&Captures) -> String {
    let regex = Regex::new( r"\{\{([\w_-]+)\}\}" ).unwrap();
    regex.replace_all(text, replacer).into_owned()
}

pub fn config_replacer<'a>( config: &'a crate::KV, blacklist_substrings : &'a [&'a str] ) -> impl Fn(&Captures) -> String + 'a {
    move |caps: &Captures| {
        let key = &caps[1];
        if blacklist_substrings.iter().any(|&substr| key.contains(substr)) {
            caps[0].to_string()
        } else {
            match config.get(key).ok() {
                Some(value) => value,
                None => caps[0].to_string(),
            }
        }
    }
}