almost finished with ch12.3

minigrep/src/main.rs

@@ -1,14 +1,97 @@
 use std::env;
+use std::fs;
+use std::process;
+use std::error::Error;
 
 fn main() {
     let args: Vec<String> = env::args().collect();
 
     // dbg!(args);
 
-    let query = &args[1];
-    let file_path = &args[2];
+    // let query = &args[1];
+    // let file_path = &args[2];
 
-    println!("Searching for {query}");
-    println!("In the file {file_path}");
+    // refactor 1
+    // let (query, file_path) = parse_config(&args);
+
+    // refactor 2
+    // let config = parse_config(&args)
+
+    // refactor 3
+    // let config = Config::new(&args);
+
+    // recfactor 6
+    let config = Config::build(&args).unwrap_or_else(|err| {
+        println!("Problem parsing arguments: {err}");
+        process::exit(1);
+    });
+
+    println!("Searching for {}", config.query);
+    println!("In the file {}", config.file_path);
+
+    // refactor 7
+    // // --snip--
+    // let contents = fs::read_to_string(config.file_path).expect("Should have been able to read the file");
+
+    // println!("With text:\n{contents}");
+
+    run(config);
 }
 
+// refactor 7
+fn run(config: Config) -> Result<(), Box<dyn Error>> {
+    let contents = fs::read_to_string(config.file_path)?;
+
+    println!("With text:\n{contents}")
+
+    Ok(())
+}
+
+// refactor 3
+struct Config {
+    query: String,
+    file_path: String,
+}
+
+// refactor 1
+// fn parse_config(args: &[String]) -> (&str, &str) {
+//     let query = &args[1];
+//     let file_path = &args[2];
+
+//     (query, file_path)
+// }
+
+// refactor 2
+// fn parse_config(args: &[String]) -> Config {
+//     let query = args[1].clone();
+//     let file_path = args[2].clone();
+
+//     Config { query, file_path }
+// }
+
+// refactor 3
+impl Config {
+    // // refactor 3
+    // fn new(args: &[String]) -> Config {
+    //     // refactor 4
+    //     if args.len() < 3 {
+    //         panic!("not enough arguments");
+    //     }
+    //     let query = args[1].clone();
+    //     let file_path = args[2].clone();
+
+    //     Config { query, file_path }
+    // }
+
+    // refactor 5
+    fn build(args: &[String]) -> Result<Config, &'static str> {
+        if args.len() < 3 {
+            return Err("not enough arguments");
+        }
+
+        let query = args[1].clone();
+        let file_path = args[2].clone();
+
+        Ok(Config { query, file_path })
+    }
+}