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extern crate regex;

use std::process::Command;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
use regex::Regex;

pub fn get() -> Option<IpAddr> {
    let output = Command::new("ifconfig")
        .output()
        .expect("failed to execute `ifconfig`");

    let stdout = String::from_utf8(output.stdout).unwrap();

    let re = Regex::new(r#"(?m)^.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*$"#).unwrap();
    for cap in re.captures_iter(&stdout) {
        if let Some(host) = cap.at(2) {
            if host != "127.0.0.1" {
                if let Ok(addr) = host.parse::<Ipv4Addr>() {
                    return Some(IpAddr::V4(addr))
                }
                if let Ok(addr) = host.parse::<Ipv6Addr>() {
                    return Some(IpAddr::V6(addr))
                }
            }
        }
    }

    None
}

#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
    }
}