extern crate open;
extern crate percent_encoding;

use std::panic;
use std::any::Any;
use percent_encoding::{utf8_percent_encode, QUERY_ENCODE_SET};

pub fn enable() {
    let hook = panic::take_hook();

    panic::set_hook(Box::new(move |info| {
        hook(info);

        let payload = info.payload();
        let msg = Any::downcast_ref::<String>(payload);
        let msg = msg.as_ref().map(|s| s.as_str());
        let msg = msg.or_else(|| Any::downcast_ref::<&'static str>(payload).map(|s| *s));

        if let Some(msg) = msg {
            let query = format!("rust lang \"{}\"", msg);
            let url = format!("https://duckduckgo.com/?q={}", utf8_percent_encode(&query, QUERY_ENCODE_SET));

            if let Err(e) = open::that(&url) {
                println!("Error opening {}: {}", url, e);
            }
        }
    }));
}