I have next code:

// part of main.rs
fn main() -> Result<(), error::ParseError> {
    foo()?;
    Ok(())
}

Assumed that foo() return error::ParseError::EmptyLine.

// error.rs
use std::{error::Error, fmt};
use colored::Colorize;

pub enum ParseError {
    EmptyLine,
}
impl fmt::Display for ParseError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        error_handler(self, f)
    }
}
impl std::fmt::Debug for ParseError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        error_handler(self, f)
    }
}
impl Error for ParseError {}

fn error_handler(error: &ParseError, f: &mut fmt::Formatter) -> fmt::Result {
    match error {
        ParseError::EmptyLine => writeln!(f, "{}", "input is an emtpy line".red().bold()),
    }
}

Next ouput after cargo run

Error: input is an emtpy line

The problem is that part input is an empty line is red, as I want, but word Error, which rust add by default, dosen’t change color. I can’t find any ways to modify this prefix or remove it. Appreciate any information how I can do it.

One more thing. I prefer to do it myself without additional libs, if it’s possible.