Add minigrep

minigrep/Cargo.toml

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+[package]
+name = "minigrep"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

minigrep/src/lib.rs

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+use std::error::Error;
+use std::fs;
+
+pub struct Config {
+    pub query: String,
+    pub filename: String,
+}
+
+impl Config {
+    pub fn new(args: &[String]) -> Result<Config, &str> {
+        if args.len() < 3 {
+            return Err("not enough arguments");
+        }
+
+        let query = args[1].clone();
+        let filename = args[2].clone();
+
+        Ok(Config { query, filename })
+    }
+}
+
+pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
+    let contents = fs::read_to_string(config.filename)?;
+
+    println!("With text:\n{}", contents);
+
+    Ok(())
+}

minigrep/src/main.rs

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+use std::{env, process};
+
+use minigrep::{
+    Config,
+    run,
+};
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let config = Config::new(&args).unwrap_or_else(|err| {
+        println!("Problem parsing arguments: {}", err);
+        process::exit(1);
+    });
+
+    println!("Searching for {}", config.query);
+    println!("In file {}", config.filename);
+
+    if let Err(e) = run(config) {
+        println!("Application error: {}", e);
+        process::exit(1);
+    }
+}

minigrep/src/resources/poem.txt

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+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!