use anyhow::{Context, Result};
use clap::Parser;
use log::info;

// Search for a pattern in a file and display the lines that contain it.
#[derive(Parser)]
struct Cli {
    pattern: String,
    path: std::path::PathBuf,
}

fn main() -> Result<()> {
    env_logger::init();
    info!("starting up");
    let args = Cli::parse();

    // let content = std::fs::read_to_string(&args.path).expect("Could not read file.");

    let content = std::fs::read_to_string(&args.path)
        .with_context(|| format!("could not read file `{}`.", args.path.display()))?;


    for line in content.lines() {
        if line.contains(&args.pattern) {
            println!("{}", line)
        }
    }

    Ok(())
}

#[allow(dead_code)]
fn answer() -> i32 {
    return 42;
}

#[test]
fn check_answer_validity() {
    assert_eq!(answer(), 42);
}