Added parsing commands

poem.txt

@@ -0,0 +1,9 @@
+I'm nobody! Who are you?
+Are you nobody, too?
+Then there's a pair of us - don't tell!
+They'd banish us, you know.
+
+How dreary to be somebody!
+How public, like a frog
+To tell your name the livelong day
+To an admiring bog!

src/lib.rs

@@ -0,0 +1,4 @@
+//TODO implement search function
+pub fn search() {
+    unimplemented!();
+}

src/main.rs

@@ -1,15 +1,64 @@
+use std::fs;
 use std::env;
+use std::error::Error;
+use std::process;
 
-fn main() {
+use minigrep::search;
+
+
+fn main() -> Result<(), Box<dyn Error>> {
     // Args returns an iterator of args from cli
     // Collect turns an iterator into a collection
     // In this case transform values of args into a vector
     let args: Vec<String> = env::args().collect();
-    let query = &args[0];
+    
-    let file_path = &args[1];
 
-    println!("Searching for {query}");
+    // let config = Config::build(&args)?;
-    println!("In file {file_path}");
+    // or
-    // TODO handle the case of less or more parameters entered by user
+    let config = Config::build(&args).unwrap_or_else(|err| {
+        println!("Problem parsing arguments: {err}");
+        process::exit(1);
+    });
+
+    println!("Searching for {}", config.query);
+    println!("In file {}", config.file_path);
+
+    // run(config)?;
+    // or
+    if let Err(e) = run(config) {
+        println!("Application error: {e}");
+        process::exit(1);
+    }
+    
+    Ok(())
+}
+
+fn run (config: Config) -> Result<(), Box<dyn Error>> {
+    let contents: String = fs::read_to_string(config.file_path)?;
+    println!("With text:\n{contents}");
+
+    search();
+
+    Ok(())
+}
+
+struct Config {
+    query: String,
+    file_path: String,
+}
+
+impl Config {
+    fn build(args: &[String]) -> Result<Config, &'static str> {
+        if args.len() > 3 {
+            return Err("Too many arguments. Usage: minigrep <query> <file_path>");
+        }
+        if args.len() < 3 {
+            return Err("Too few arguments. Usage: minigrep <query> <file_path>");
+        }
+        let query = args[1].clone();
+        let file_path = args[2].clone();
+
+        Ok(Config { query, file_path })
+    }
 }