use failure::Error;
use nom::{named, do_parse, opt, tag, map_res, take_while, space, alphanumeric};

named!(key_value    <&str,(&str,&str)>,
  do_parse!(
        opt!(space) >> tag!("[") >>
  key:  take_while!(alphanumeric) >>
        opt!(space) >> tag!("=") >> opt!(space) >>
  val:  take_while!(alphanumeric) >>
        opt!(space) >> tag!("]") >> opt!(space) >>
  (key, val)
  )
);

fn main() -> Result<(), Error> {
    let text = r#"[color = "hueolor"]"#;
    Ok(())
}