src/doc/book/listings/ch12-an-io-project/listing-12-08/src/main.rs

   1 use std::env;
   2 use std::fs;
   3
   4 fn main() {
   5     let args: Vec<String> = env::args().collect();
   6
   7     let config = Config::new(&args);
   8
   9     println!("Searching for {}", config.query);
  10     println!("In file {}", config.file_path);
  11
  12     let contents = fs::read_to_string(config.file_path)
  13         .expect("Should have been able to read the file");
  14
  15     println!("With text:\n{contents}");
  16 }
  17
  18 struct Config {
  19     query: String,
  20     file_path: String,
  21 }
  22
  23 impl Config {
  24     // ANCHOR: here
  25     // --snip--
  26     fn new(args: &[String]) -> Config {
  27         if args.len() < 3 {
  28             panic!("not enough arguments");
  29         }
  30         // --snip--
  31         // ANCHOR_END: here
  32
  33         let query = args[1].clone();
  34         let file_path = args[2].clone();
  35
  36         Config { query, file_path }
  37     }
  38 }