You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: line_editor.rs
    path of file: ./repos/wezterm/termwiz/examples
    
    the code of the file until where you have to start completion: use std::str::FromStr;
use termwiz::cell::AttributeChange;
use termwiz::color::{AnsiColor, ColorAttribute, SrgbaTuple};
use termwiz::lineedit::*;

#[derive(Default)]
struct Host {
    history: BasicHistory,
}

impl LineEditorHost for Host {
    // Render the prompt with a darkslateblue background color if
    // the terminal supports true color, otherwise render it with
    // a
    
fn main() -> termwiz::Result<()> {
    println!("Type `exit` to quit this example, or start a word with `h` and press Tab.");
    let mut terminal = line_editor_terminal()?;
    let mut editor = LineEditor::new(&mut terminal);

    let mut host = Host::default();
    loop {
        if let Some(line) = editor.read_line(&mut host)? {
            println!("read line: {:?}", line);
            if line == "exit" {
                break;
            }

            host.history().add(&line);
        }
    }

    Ok(())
}