└── only


/only:
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 1 | use serde::{Deserialize, Serialize};
 2 | use std::fs;
 3 | 
 4 | #[derive(Serialize, Deserialize, Debug)]
 5 | struct Config {
 6 |     username: String,
 7 |     theme: String,
 8 |     auto_save: bool,
 9 | }
10 | 
11 | impl Config {
12 |     fn load(filename: &str) -> Self {
13 |         let data = fs::read_to_string(filename).unwrap();
14 |         serde_json::from_str(&data).unwrap()
15 |     }
16 | 
17 |     fn save(&self, filename: &str) {
18 |         let data = serde_json::to_string_pretty(self).unwrap();
19 |         fs::write(filename, data).unwrap();
20 |     }
21 | }
22 | 
23 | fn main() {
24 |     let filename = "config.json";
25 |     let mut config = Config::load(filename);
26 | 
27 |     println!("Current Config: {:?}", config);
28 |     config.theme = "dark".to_string();
29 |     config.save(filename);
30 | }
31 | 


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