moved all the definitions into lib.rs

src/lib.rs

@@ -0,0 +1,23 @@
+use std::{error::Error, fs};
+
+pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
+    let content = fs::read_to_string(config.file_path)?;
+    println!("Content:\n {}", content);
+    Ok(())
+}
+
+pub struct Config {
+    pub query: String,
+    pub file_path: String,
+}
+
+impl Config {
+    pub 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 })
+    }
+}

src/main.rs

@@ -1,6 +1,5 @@
+use minigrep::Config;
 use std::env;
-use std::error::Error;
-use std::fs;
 use std::process;
 
 fn main() {
@@ -15,30 +14,8 @@ fn main() {
     println!("Searching for {}", config.query);
     println!("In file {}", config.file_path);
 
-    if let Err(e) = run(config) {
+    if let Err(e) = minigrep::run(config) {
         println!("Application error: {e}");
         process::exit(1)
     }
 }
-
-fn run(config: Config) -> Result<(), Box<dyn Error>> {
-    let content = fs::read_to_string(config.file_path)?;
-    println!("Content:\n {}", content);
-    Ok(())
-}
-
-struct Config {
-    query: String,
-    file_path: String,
-}
-
-impl Config {
-    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 })
-    }
-}