test_minigrip 0.1.0

use std::fs;
use std::error::Error;
use std::env;

pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
    let contents = fs::read_to_string(config.filename)
        .expect("Something went wrong reading the file");

    for line in search(&config.query, &contents) {
        println!("{}", line);
    }

    Ok(())
}

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();
        let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
    
        Ok(Config {query, filename, case_sensitive})
    }
}

pub struct Config {
    pub query: String,
    pub filename: String,
    pub case_sensitive: bool,
}

pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
    let mut results = Vec::new();

    for line in contents.lines() {
        if line.contains(query) {
            results.push(line);
        }
    }

    results
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn one_result() {
        let query = "rUst";
        let contents = "\
Rust:
safe, fast, productive.
Pick three.
Trust me.";

        assert_eq!(vec!["safe, fast, productive"], search(query, contents));
    }
}