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: config.rs
    path of file: ./repos/medup/src/bin/medup
    
    the code of the file until where you have to start completion: use std::{error::Error, fs::File, io::Read, path::Path};

use serde::{Deserialize, Serialize};

const TEMPLATE_FILE_NAME: &str = "template.txt";

#[derive(Default, Debug, Serialize, Deserialize, Clone)]
pub(crate) struct ConfigJson {
    #[serde(default)]
    pub css_href: String,
    pub body_min_width: i32,
    pub body_max_width: i32,
    pub use_slice_mode: bool,
    pub slice_header: String,
}

#[derive(Defa
    
    pub(crate) fn read(path: &str) -> Result<Config, Box<dyn Error>> {
        let mut buf = String::new();
        File::open(path)?.read_to_string(&mut buf)?;

        let mut cj: ConfigJson = serde_json::from_str(&buf)?;
        if cj.body_min_width == 0 {
            cj.body_min_width = 200;
        }
        if cj.body_max_width == 0 {
            cj.body_max_width = 900;
        }

        // read template
        let mut buf = String::new();
        Path::new(path).parent().map(|p| {
            let mut template_path = p.to_path_buf();
            template_path.push(TEMPLATE_FILE_NAME);
            File::open(template_path)
                .map(|mut f| f.read_to_string(&mut buf))
                .ok();
        });

        Ok(Config {
            config_json: cj,
            template: buf,
        })
    }